Paddleducks
Other Marine Models => Live steam => Topic started by: Tony Bird on March 20, 2016, 04:31:30 AM
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Hi,
Some years ago a bought a lot of a lot of model boat magazines in a charity shop. Having read them except for the ones that had 'Free' plans with they were I disposed of. A couple of weeks ago I was leafing through these magazines and in an 2007 April edition of Marine Modelling International there was a free plan of a Murray River Paddle Steamer 'Jennifer Anne' designed by Eris Kennedy an Australian. The model is quite small about 20" long and powered by an electric motor. As recently I have been designing and working on a gear box for a steam powered model paddle boat I was quite interested. I am going to try and make a steam powered version of Eris's model. I expect it will have to be altered a bit to accommodate a steam engine and boiler. A friend is going to 3D print some paddle wheels for me. Other than thinking about it all I have done is made a modified version of the gear box I have been playing with, this gear box will either have a steam engine fitted to it or will be driven by a shaft from a steam engine. As I want the steam engine to be self starting it will have to have several small cylinders. The first job will be to check out the paddles to see how much power is needed they will be several weeks arriving so no much can be done in the near future.
'Jennifer Anne' as designed powered by an electric motor.
(http://gallery.myff.org/gallery/1966982/IMG_5957+LR.jpg) (http://gallery.myff.org/gallery/1966982/IMG_5957+LR.jpg)
One of the engine and gear boxes I have been working on.
(http://gallery.myff.org/gallery/1966984/IMG_5317+LR.jpg) (http://gallery.myff.org/gallery/1966984/IMG_5317+LR.jpg)
The gear box only that I have nearly finished.
(http://gallery.myff.org/gallery/1966985/IMG_5971+LR.jpg) (http://gallery.myff.org/gallery/1966985/IMG_5971+LR.jpg)
(http://gallery.myff.org/gallery/1966986/IMG_5972+LR.jpg) (http://gallery.myff.org/gallery/1966986/IMG_5972+LR.jpg)
(http://gallery.myff.org/gallery/1966987/IMG_5973+LR.jpg) (http://gallery.myff.org/gallery/1966987/IMG_5973+LR.jpg)
I will report progress.
Regards Tony.
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Looks like it is going to be a nice little steamer. What kind of paddle wheels are you having made?
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Hi,
Looks like it is going to be a nice little steamer. What kind of paddle wheels are you having made?
I am meeting with a friend at a model railway show in a couple of weeks time to discuss the design of the paddle wheels. The size and number of blades will be to the drawing, I would like a paddle that was made in one piece, but there are constrains made by using a 3D printer to make it, so we will see. Once I have paddles I can check out the size of engine and gear ratios; I have already made a small boiler that might be suitable, oddly it was one of a pair that was designed to power a small model of a paddle boat.
Regards Tony.
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Hi,
I have had a meeting with the friend who is going to 3D print some paddle wheels for me. He has worked out how the paddles will be constructed; a very simple design with 12 blades.
I have started work on a prototype hull. The plan of the hull has been photocopied and has been increased in length to 54 cm to give more buoyancy and still still be less than the 50 Mini Vap rule.
The plain section on the drawing is the extra length.
(http://gallery.myff.org/gallery/1974836/IMG_6226+LR.jpg) (http://gallery.myff.org/gallery/1974836/IMG_6226+LR.jpg)
A half section template was made from thin plywood it could have been from card but I didn't have any. The half section plan glued to the plywood.
(http://gallery.myff.org/gallery/1974839/IMG_6227+cropped+LR.jpg) (http://gallery.myff.org/gallery/1974839/IMG_6227+cropped+LR.jpg)
The Half section was cut out.
(http://gallery.myff.org/gallery/1974840/IMG_6228+LR.jpg) (http://gallery.myff.org/gallery/1974840/IMG_6228+LR.jpg)
And the paper removed.
(http://gallery.myff.org/gallery/1974841/IMG_6229+LR.jpg) (http://gallery.myff.org/gallery/1974841/IMG_6229+LR.jpg)
The hull to be made is for testing and for positioning the boiler, engine in it so I am using timber that I have to hand. The hull shape will be to the extended drawing but the construction will be as open as possible to allow easy distribution of the various parts of engine boiler etc. The original instructions with the drawings specified balsa wood for construction. I don't have any balsa wood and for steam use a more robust hull might be an idea. So one of my usual sources of timer was used.
(http://gallery.myff.org/gallery/1974842/IMG_6236+LR.jpg) (http://gallery.myff.org/gallery/1974842/IMG_6236+LR.jpg)
I don't make many boats from scratch so my constructional techniques tend to evolve so there are probably better ways of doing it. The coping saw was fitted with a new blade and cutting was started.
(http://gallery.myff.org/gallery/1974843/IMG_6230+LR.jpg) (http://gallery.myff.org/gallery/1974843/IMG_6230+LR.jpg)
The two halves of the bottom of the hull were glued together.
(http://gallery.myff.org/gallery/1974845/IMG_6231+LR.jpg) (http://gallery.myff.org/gallery/1974845/IMG_6231+LR.jpg)
Being a metalworker the result was filed rather than planed, I do have a plane somewhere.
(http://gallery.myff.org/gallery/1974847/IMG_6232+LR.jpg) (http://gallery.myff.org/gallery/1974847/IMG_6232+LR.jpg)
To give the most access the deck was modified from the drawings.
(http://gallery.myff.org/gallery/1974848/IMG_6234+LR.jpg) (http://gallery.myff.org/gallery/1974848/IMG_6234+LR.jpg)
The two sections of deck nailed together for filing.
(http://gallery.myff.org/gallery/1974850/IMG_6237+LR.jpg) (http://gallery.myff.org/gallery/1974850/IMG_6237+LR.jpg)
The ends of the deck were glued and slotted for a piece of plywood foe extra strength.
(http://gallery.myff.org/gallery/1974852/IMG_6238+LR.jpg) (http://gallery.myff.org/gallery/1974852/IMG_6238+LR.jpg)
The drawings called for formers to hold the bottom of the hull and deck apart but to give maximum access pillars were used.
(http://gallery.myff.org/gallery/1974853/IMG_6239+LR.jpg) (http://gallery.myff.org/gallery/1974853/IMG_6239+LR.jpg)
(http://gallery.myff.org/gallery/1974854/IMG_6241+LR.jpg) (http://gallery.myff.org/gallery/1974854/IMG_6241+LR.jpg)
That is as far as I have got with the hull.
Regards Tony.
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:)Although the good evening;
Alor, I love this kind of construction, bravo!
But I board believed that translate the shell is Balsa?
Fear thou not water infiltration that destroys you your shell?
cordially
François
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Hi Francois,
The hull so far has been made of spruce from a Pine tree so shouldn't suffer with water damage.
A bit more has been done to the hull more pillars have been fitted.
(http://gallery.myff.org/gallery/1974961/IMG_6242+LR.jpg) (http://gallery.myff.org/gallery/1974961/IMG_6242+LR.jpg)
(http://gallery.myff.org/gallery/1974962/IMG_6243+LR.jpg) (http://gallery.myff.org/gallery/1974962/IMG_6243+LR.jpg)
And a inner thin plywood skin has been fitted.
(http://gallery.myff.org/gallery/1974963/IMG_6244+LR.jpg) (http://gallery.myff.org/gallery/1974963/IMG_6244+LR.jpg)
(http://gallery.myff.org/gallery/1974964/IMG_6245+LR.jpg) (http://gallery.myff.org/gallery/1974964/IMG_6245+LR.jpg)
(http://gallery.myff.org/gallery/1974966/IMG_6246+LR.jpg) (http://gallery.myff.org/gallery/1974966/IMG_6246+LR.jpg)
The hull so far has been sealed and hopefully the outer skin will be fitted tomorrow.
Regards Tony.
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Hi,
Today I skinned the hull with 1/16" (1.5mm) plywood.
Both sides being skinned at the same time.
(http://gallery.myff.org/gallery/1975247/IMG_6249+LR.jpg) (http://gallery.myff.org/gallery/1975247/IMG_6249+LR.jpg)
The bows were done separately this is the second one being glued.
(http://gallery.myff.org/gallery/1975250/IMG_6252+LR.jpg) (http://gallery.myff.org/gallery/1975250/IMG_6252+LR.jpg)
The hull as it looks at the moment.
(http://gallery.myff.org/gallery/1975251/IMG_6254+LR.jpg) (http://gallery.myff.org/gallery/1975251/IMG_6254+LR.jpg)(http://gallery.myff.org/gallery/1975252/IMG_6255+LR.jpg) (http://gallery.myff.org/gallery/1975252/IMG_6255+LR.jpg)
(http://gallery.myff.org/gallery/1975253/IMG_6256+LR.jpg) (http://gallery.myff.org/gallery/1975253/IMG_6256+LR.jpg)(http://gallery.myff.org/gallery/1975254/IMG_6257+LR.jpg) (http://gallery.myff.org/gallery/1975254/IMG_6257+LR.jpg)
Regards Tony.
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:)Hello Tony;
as on another forum, I am worried about the tightness of your clamshell, you will make him an exterior protection with resin and fiberglass?
What has against dumped you used, the wood-based Birch?
The curve has caused you caused the problem?
Regards Francois
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Hi Francois,
As I have mentioned I have used this construction and materials before on a model boat a steam powered canal tug that uses a model steam locomotive as a means of power.
(http://gallery.myff.org/gallery/1975421/005+Aqua+Cracker+hull+construction+LR.jpg) (http://gallery.myff.org/gallery/1975421/005+Aqua+Cracker+hull+construction+LR.jpg)
(http://gallery.myff.org/gallery/1975422/Aqua+Cracker+008+LR.jpg) (http://gallery.myff.org/gallery/1975422/Aqua+Cracker+008+LR.jpg)
(http://gallery.myff.org/gallery/1975423/Aqua+Cracker+010+LR.jpg) (http://gallery.myff.org/gallery/1975423/Aqua+Cracker+010+LR.jpg)
(http://gallery.myff.org/gallery/1975424/Leek+Aqua+Cracker+on+Boating+Pond+1+LR.jpg) (http://gallery.myff.org/gallery/1975424/Leek+Aqua+Cracker+on+Boating+Pond+1+LR.jpg)
Regards Tony.
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Hi,
I caught up with some domestic engineering this morning and did a bit on the hull this afternoon.
The hull had been sealed and hung up to dry yesterday afternoon.
(http://gallery.myff.org/gallery/1975784/IMG_6259+LR.jpg) (http://gallery.myff.org/gallery/1975784/IMG_6259+LR.jpg)
This morning a displacement test was done to see how much weight there is to play with for the rest of the construction.
(http://gallery.myff.org/gallery/1975785/IMG_6262+LR.jpg) (http://gallery.myff.org/gallery/1975785/IMG_6262+LR.jpg)
(http://gallery.myff.org/gallery/1975786/IMG_6263+LR.jpg) (http://gallery.myff.org/gallery/1975786/IMG_6263+LR.jpg)
About 2.4 kg nearly 5.5 lb to get the hull to its water line.
(http://gallery.myff.org/gallery/1975787/IMG_6264+LR.jpg) (http://gallery.myff.org/gallery/1975787/IMG_6264+LR.jpg)
A start has been made on the sponsons which will hold the paddle wheel covers.
(http://gallery.myff.org/gallery/1975793/IMG_6265+LR.jpg) (http://gallery.myff.org/gallery/1975793/IMG_6265+LR.jpg)
(http://gallery.myff.org/gallery/1975788/IMG_6267+LR.jpg) (http://gallery.myff.org/gallery/1975788/IMG_6267+LR.jpg)
A dry run with a boiler and engine.
(http://gallery.myff.org/gallery/1975789/IMG_6269+LR.jpg) (http://gallery.myff.org/gallery/1975789/IMG_6269+LR.jpg)
(http://gallery.myff.org/gallery/1975790/IMG_6271+LR.jpg) (http://gallery.myff.org/gallery/1975790/IMG_6271+LR.jpg)
The engine and empty boiler come in at just under 1.5 lbs so there is a bit to play with.
(http://gallery.myff.org/gallery/1975792/IMG_6268+LR.jpg) (http://gallery.myff.org/gallery/1975792/IMG_6268+LR.jpg)
Regards Tony.
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Looks a bit ugly out of the water, but wathing with interest. Love the worm gearbox.
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Hi Pete,
Looks a bit ugly out of the water. Yes, a bit likes its builder short and fat! Having a deeper displacement doesn't help maybe the paddle boxes will improve the appearance.
Regards Tony.
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Hi,
Today I did a bit of metal work along with some wood work. I don't know what it does but the Murray River paddle boat has a very long stem post. Presumably made of wood; for a model this looked a bit vulnerable so one was made of aluminium and screwed in place.
(http://gallery.myff.org/gallery/1976030/IMG_6273+LR.jpg) (http://gallery.myff.org/gallery/1976030/IMG_6273+LR.jpg)
(http://gallery.myff.org/gallery/1976031/IMG_6275+LR.jpg) (http://gallery.myff.org/gallery/1976031/IMG_6275+LR.jpg)
The large rudder was cut out of plywood and a hinge made. The hinge is simply a couple of brass eyes screwed into he hull. The rudder has a brass tube glued to it and is held between the brass eyes with a brass rod. A slight kink in the brass rod stops it from falling out and allows it to be removed when necessary.
(http://gallery.myff.org/gallery/1976032/IMG_6276+LR.jpg) (http://gallery.myff.org/gallery/1976032/IMG_6276+LR.jpg)
It was decided to make a drive system for the paddles so some bearing for the paddles shaft were made from some aluminium channel. The 18:1 drive is by Mamod type spring belt and some commercial 1:1 plastic pulleys.
(http://gallery.myff.org/gallery/1976033/IMG_6281+LR.jpg) (http://gallery.myff.org/gallery/1976033/IMG_6281+LR.jpg)
The model now looks like this.
(http://gallery.myff.org/gallery/1976034/IMG_6283+LR.jpg) (http://gallery.myff.org/gallery/1976034/IMG_6283+LR.jpg)
A short video of the engine, gear box and drive running on about 8 psi of air.
https://youtu.be/9LiTdApba6Q
<iframe width="420" height="315" src="https://www.youtube.com/embed/9LiTdApba6Q" frameborder="0" allowfullscreen></iframe>
Regards Tony.
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Hi,
The paddle boxes have been made.
(http://gallery.myff.org/gallery/1976426/IMG_6298+LR.jpg) (http://gallery.myff.org/gallery/1976426/IMG_6298+LR.jpg)(http://gallery.myff.org/gallery/1976427/IMG_6299+LR.jpg) (http://gallery.myff.org/gallery/1976427/IMG_6299+LR.jpg)
(http://gallery.myff.org/gallery/1976428/IMG_6300+LR.jpg) (http://gallery.myff.org/gallery/1976428/IMG_6300+LR.jpg)(http://gallery.myff.org/gallery/1976429/IMG_6301+LR.jpg) (http://gallery.myff.org/gallery/1976429/IMG_6301+LR.jpg)
A steam test was done and the boiler makes enough steam for the engine and probably any other engine that is likely to be fitted to the hull.
A video is at:
https://youtu.be/7NdLD90JG7U
In Old South Wales the sun is shining and may it do so for the rest of the day as I will be playing with trains at the CMES.
Regards Tony.
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Hi,
Not a lot of progress on the hull some combing has been put around the deck and some undercoat applied.
(http://gallery.myff.org/gallery/1977184/IMG_6308+LR.jpg) (http://gallery.myff.org/gallery/1977184/IMG_6308+LR.jpg)
(http://gallery.myff.org/gallery/1977185/IMG_6314+LR.jpg) (http://gallery.myff.org/gallery/1977185/IMG_6314+LR.jpg)
(http://gallery.myff.org/gallery/1977187/IMG_6319+LR.jpg) (http://gallery.myff.org/gallery/1977187/IMG_6319+LR.jpg)
I'll have to make a start on some paddles!
Regards Tony.
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Hi,
Today I did some more painting and made a paddle wheel from some 1/16" aluminium sheet.
(http://gallery.myff.org/gallery/1977453/IMG_6324+LR.jpg) (http://gallery.myff.org/gallery/1977453/IMG_6324+LR.jpg)
(http://gallery.myff.org/gallery/1977454/IMG_6326+LR.jpg) (http://gallery.myff.org/gallery/1977454/IMG_6326+LR.jpg)
(http://gallery.myff.org/gallery/1977455/IMG_6327+LR.jpg) (http://gallery.myff.org/gallery/1977455/IMG_6327+LR.jpg)
(http://gallery.myff.org/gallery/1977456/IMG_6328+LR.jpg) (http://gallery.myff.org/gallery/1977456/IMG_6328+LR.jpg)
(http://gallery.myff.org/gallery/1977457/IMG_6330+LR.jpg) (http://gallery.myff.org/gallery/1977457/IMG_6330+LR.jpg)
(http://gallery.myff.org/gallery/1977458/IMG_6331+LR.jpg) (http://gallery.myff.org/gallery/1977458/IMG_6331+LR.jpg)
Regards Tony.
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:) Hello ;
Why complicate things when simplicity works too
cordially
François
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Hi,
Completed paddles.
(http://gallery.myff.org/gallery/1977668/IMG_6336+LR.jpg) (http://gallery.myff.org/gallery/1977668/IMG_6336+LR.jpg)
Regards Tony.
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Hi,
I did some more on the paddle boat today. I have decided it is as far as I will go with the painting, it could be a lot better, arthritic hands don't help when sanding!
A drip tray for the engine.
(http://gallery.myff.org/gallery/1977865/IMG_6337+LR.jpg) (http://gallery.myff.org/gallery/1977865/IMG_6337+LR.jpg)
A simple stand was made.
(http://gallery.myff.org/gallery/1977866/IMG_6338+LR.jpg) (http://gallery.myff.org/gallery/1977866/IMG_6338+LR.jpg)
The paddles and engine fitted.
(http://gallery.myff.org/gallery/1977867/IMG_6346+LR.jpg) (http://gallery.myff.org/gallery/1977867/IMG_6346+LR.jpg)
The paddle boxes fitted.
(http://gallery.myff.org/gallery/1977868/IMG_6339+LR.jpg) (http://gallery.myff.org/gallery/1977868/IMG_6339+LR.jpg)
(http://gallery.myff.org/gallery/1977869/IMG_6340+LR.jpg) (http://gallery.myff.org/gallery/1977869/IMG_6340+LR.jpg)
It has been run on air again a video is at:
https://youtu.be/xUkX8HcZXmQ
Regards Tony.
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:) Hello ;
Small wheels just waiting to offer this boat for large shipments! ;)
cordially
François
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Hi,
I did some work on the boiler today. The boiler was intended for a boat and it was built a few years ago. As designed the steam was going to a reversing valve/regulator before going to an engine so the boiler has no regulator fitted. The boiler is a pot boiler with heat exchanger pins and can be fired by Sterno or a ceramic gas burner.
A constructional photograph of the boiler showing the pins steam pipe and where the steam is collected, the steam dome when fitted holds the condensing chimney.
(http://gallery.myff.org/gallery/1978060/02%2BBoiler%2Bwith%2Bhedgehog%2Bpins%2BLR.jpg) (http://gallery.myff.org/gallery/1978060/02%2BBoiler%2Bwith%2Bhedgehog%2Bpins%2BLR.jpg)
The boiler and its Sterno tray before any further work was done on it
(http://gallery.myff.org/gallery/1978061/IMG_6349+LR.jpg) (http://gallery.myff.org/gallery/1978061/IMG_6349+LR.jpg)
As the engine is a single acting one and won't self start so there is no point in fitting a reversing valve. If the model boat had been screw driven like a lot of the model steam boats made years ago by the likes of Bowman a regulator needn't be fitted. But as this is a paddle boat I thought it might be wise to fit a regulator to try and get the best out of the paddles, it might turn out not to be necessary.
(http://gallery.myff.org/gallery/1978062/IMG_6353+LR.jpg) (http://gallery.myff.org/gallery/1978062/IMG_6353+LR.jpg)(http://gallery.myff.org/gallery/1978063/IMG_6351+lr.jpg) (http://gallery.myff.org/gallery/1978063/IMG_6351+lr.jpg)
As the boiler looks in the hull.
(http://gallery.myff.org/gallery/1978064/IMG_6357+LR.jpg) (http://gallery.myff.org/gallery/1978064/IMG_6357+LR.jpg)(http://gallery.myff.org/gallery/1978065/IMG_6358+LR.jpg) (http://gallery.myff.org/gallery/1978065/IMG_6358+LR.jpg)
As can be seen the whistle has been replaced by a top-up valve and the exhaust connected. A lubricator needs to be made and fitted and the boiler secured in the hull before a steam test can be made.
Regards Tony.
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Hi,
A lubricator was made and fitted today. I am not very keen on lubricators that have a drain I prefer them that need a syringe to empty them as they are not as messy to empty. To allow the syringe draining tube to pass the steam pipe it is off-set when it goes through the reservoir. This is easy to do as long as the tube to be drilled has been plugged with wood. An undersized hole for the steam pipe is drilled in the reservoir at right angle to the tube, while the drill is still rotating in the tube is turned so the drill is at a tangent to the diameter of the tube. The tube is then plugged with a hard wood and the exit hole for the steam pipe is drilled this pilot hole is then drilled to the size of the steam pipe.
(http://gallery.myff.org/gallery/1978257/IMG_6362+LR.jpg) (http://gallery.myff.org/gallery/1978257/IMG_6362+LR.jpg)
The steam pipe marked with the position of the hole.
(http://gallery.myff.org/gallery/1978263/IMG_6365+LR.jpg) (http://gallery.myff.org/gallery/1978263/IMG_6365+LR.jpg)
It can be difficult to drill the small hole in the steam pipe especially if it has been annealed. What I do is to use a small round file to file part way through the steam pipe a the use a n old gramophone needed held in a pin vice to make the hole. Sewing needle would probably also work. Sorry it is a poor photograph of the result.
(http://gallery.myff.org/gallery/1978262/IMG_6367+LR.jpg) (http://gallery.myff.org/gallery/1978262/IMG_6367+LR.jpg)
To insulate the boiler from the hull the modern equivalent of asbestos was used; it is the fire retardant material used as eves in houses.
(http://gallery.myff.org/gallery/1978268/IMG_6359+LR.jpg) (http://gallery.myff.org/gallery/1978268/IMG_6359+LR.jpg)
This board was cut slightly smaller than the base of the boiler and cooking foil was attached either side of it.
(http://gallery.myff.org/gallery/1978269/IMG_6361+LR.jpg) (http://gallery.myff.org/gallery/1978269/IMG_6361+LR.jpg)
Some brackets were made to hold the boiler in the hull.
(http://gallery.myff.org/gallery/1978271/IMG_6360+LR.jpg) (http://gallery.myff.org/gallery/1978271/IMG_6360+LR.jpg)
The boiler was fitted into the hull and connected to the engine.
(http://gallery.myff.org/gallery/1978272/IMG_6374+LR.jpg) (http://gallery.myff.org/gallery/1978272/IMG_6374+LR.jpg)
(http://gallery.myff.org/gallery/1978273/IMG_6375+LR.jpg) (http://gallery.myff.org/gallery/1978273/IMG_6375+LR.jpg)
(http://gallery.myff.org/gallery/1978275/IMG_6378+LR.jpg) (http://gallery.myff.org/gallery/1978275/IMG_6378+LR.jpg)
The engine has been steam tested with the boiler fitted in the hull, I will post a video of it running when it has been down loaded.
Regards Tony.
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Hi,
A steam test video at:
https://youtu.be/jiSNmjoM6Fg
Regards Tony.
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Hi,
Today I had to get one of my larger engines ready for its 4 year hydraulic boiler test which hopefully will be done this Saturday at the CMES. That took most of the morning then we then had a phone call inviting us out to lunch, which was very nice so I have only had an hour or so's playing with the paddle boat. I decided to give it a run in a test tank (plastic box). First the hull was ballasted to its water line. Paper templates were used and lead sheet cut to them.
(http://gallery.myff.org/gallery/1978497/IMG_6380+LR.jpg) (http://gallery.myff.org/gallery/1978497/IMG_6380+LR.jpg)
Two sheets of lead at both bow and stern were needed to get the hull to its water line.
(http://gallery.myff.org/gallery/1978498/IMG_6382+LR.jpg) (http://gallery.myff.org/gallery/1978498/IMG_6382+LR.jpg)(http://gallery.myff.org/gallery/1978500/IMG_6383+LR.jpg) (http://gallery.myff.org/gallery/1978500/IMG_6383+LR.jpg)
The boiler was fired up and the engine ran in the plastic box. Every thing seemed to work well and the engine under load was very controllable.
(http://gallery.myff.org/gallery/1978503/IMG_6386+LR.jpg) (http://gallery.myff.org/gallery/1978503/IMG_6386+LR.jpg)
I am not sure how far the paddle blades should go into the water they are ballasted to about about half their depth at the moment, even with the blades completely submerged the engine coped with the extra load easily.
(http://gallery.myff.org/gallery/1978507/IMG_6390+LR.jpg) (http://gallery.myff.org/gallery/1978507/IMG_6390+LR.jpg)(http://gallery.myff.org/gallery/1978508/IMG_6387+LR.jpg) (http://gallery.myff.org/gallery/1978508/IMG_6387+LR.jpg)
The video will follow when it is down loaded.
Regards Tony.
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Well congratulations Tony on the first water test & all appears fine :goodnews
We must acknowledge the speed of progress on this build has been nothing but outstanding :clap
With respect to paddle blade immersion, most vessels appear to have the 6 o-clock blade under water with the next blades [toward 5 & 7 o-clock] just licking the water......however naturally your first river tests will dictate this
Will you be installing R/C equipment, or will she be a straight runner?
Looking forward to seeing the video.......Derek..... :beer
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Hi,
Video at.
https://youtu.be/Nx-TX9uo710
Rudder only R/C to be fitted.
Regards Tony.
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Looks really nice Tony. :clap :clap
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Hi Derek,
With respect to paddle blade immersion, most vessels appear to have the 6 o-clock blade under water with the next blades [toward 5 & 7 o-clock] just licking the water......however naturally your first river tests will dictate this
Thank you for this information which seems logical. This is the first model paddle driven boat that I have made. The drawings that I used as the basis of my model showed the wooden paddles used as so:
(http://gallery.myff.org/gallery/1978687/IMG_6392+LR.jpg) (http://gallery.myff.org/gallery/1978687/IMG_6392+LR.jpg)
In the text with the drawings the designer said that it was his first effort at making a paddle drive model. The model worked though its designer mentioned the paddles threw up a lot of water. I didn't fancy making a similar design in metal, hence my design. I used 8 blades rather than the 12 on the drawing because with the construction used it wouldn't be easy for a Pop riveter to get between the blades if 12 were used. With the information you gave me I did this drawing of the 110 mm paddle wheel used on the model.
(http://gallery.myff.org/gallery/1978690/Paddle+drawing+LR.jpg) (http://gallery.myff.org/gallery/1978690/Paddle+drawing+LR.jpg)
It would appear from the drawing that the lesser number of blades that are used for one revolution of the paddle wheel more water is moved? Is it known if this is a fact and benefit for use on models? Also is there any point in the blade being any higher than the maximum depth that it goes into the water?
I am fitting R/C into the hull, initially rudder only. This hull will be used to try out different ideas regarding boiler, engine, gear box and now perhaps paddle design. I have already cut out materials to make another hull of similar design which I hope to fit the results of my experimentation to and it will have a superstructure similar the the original design. When I have fitted the R/C gear I hope to try the efforts so far made on the water proper. This might be some time happening but I will report the results.
Regards Tony.
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Evening Tony......there are so many variables with paddle design & enough to complicate any build even if producing a paddle wheel set that is/are scaled on the original full size build
Scale, paddle wheel diameter, number of blades, immersion depth, height of blade, width of blade & paddle shaft axis speed
Working backwards, model paddle shaft axis speed should be the real ship shaft RPM x by the cube root of scale....this is the only scientific or mathematically valid unit of input in the calculation, and even this negates the fact that we cannot down scale the surface tension of water
Over the past years of this WEB site, we have taken a rather conservative attitude with paddle deign & speed and have generally considered using prototypical wheel scale dimensions and coupled with the calculated scale paddle shaft RPM as a starting point
Many builders have considered scale like wheel dimensions as more important than wheel to vessel performance, however by using a form of variable paddle shaft RPM to compensate for any shortcomings
So varying any of the paddle design or dimension elements will invariably alter the wheel performance
The proposition you put forward re the number of paddle blades is only relative to the depth of immersion....
8 blades *16 depth = 128
12 blades *8 depth = 96
however
12 blades * 16 depth = 192
So from this, I am not suggesting any design element is not correct, it is however more of a trial and error on the water to understand a vessels performance to expectations
[I have a long suffering paddle steam build....a hull I drew the plans for in Y2000 & a build that will eventuate]
:goodluck .....& keep us posted with your progress........... Derek :beer
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Hi Derek,
Many thanks for your answer, it certainly looks as if it is a bit suck and see. My point with the drawing was given the same criterion 'With respect to paddle blade immersion, most vessels appear to have the 6 o-clock blade under water with the next blades [toward 5 & 7 o-clock] just licking the water'. that a smaller number of blades appear to move more water.
Your engine for your boat looks wonderful much better than I could achieve. I will need to go into the city to get some R/C kit before any more progress can be made.
Regards Tony.
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Wow Tony - incredibly fast progress. With the engine/boiler in the hull does not seem quite as clunky now. Great work
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Hi,
I have been into town to get some R/C gear from a model shop and on returning home set about fitting it into the hull. As for the moment the R/C will be for rudder only and space is a bit limited so a box for the R/C was made.
(http://gallery.myff.org/gallery/1979793/IMG_6400+LR.jpg) (http://gallery.myff.org/gallery/1979793/IMG_6400+LR.jpg)
All the R/C gear fits in the box, which will give limited protection from water.
(http://gallery.myff.org/gallery/1979794/IMG_6401+LR.jpg) (http://gallery.myff.org/gallery/1979794/IMG_6401+LR.jpg)
The weight of the batteries etc. will replace some of the lead ballast, the R/C box is held into the hull with a couple of brackets.
(http://gallery.myff.org/gallery/1979795/IMG_6402++LR.jpg) (http://gallery.myff.org/gallery/1979795/IMG_6402++LR.jpg)
The rudder fitted.
(http://gallery.myff.org/gallery/1979796/IMG_6406+LR.jpg) (http://gallery.myff.org/gallery/1979796/IMG_6406+LR.jpg)
(http://gallery.myff.org/gallery/1979797/IMG_6405+LR.jpg) (http://gallery.myff.org/gallery/1979797/IMG_6405+LR.jpg)
The model is now about ready for checking out. A tank for the waste oil still has to be made and a box to transport the will also have to be made. So with a bit of luck and good weather it shouldn't be long before the model has its maiden voyage.
Regards Tony.
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Hi,
In theory the model is ready for its maiden voyage. A tank for the separated oil has been made and fitted, it will be empted using a syringe and the hull has been re- ballasted to compensate for the weight of the R/C. I am in the process of making a box to transport the model in.
(http://gallery.myff.org/gallery/1980233/IMG_6414+LR.jpg) (http://gallery.myff.org/gallery/1980233/IMG_6414+LR.jpg)
(http://gallery.myff.org/gallery/1980234/IMG_6413+LR.jpg) (http://gallery.myff.org/gallery/1980234/IMG_6413+LR.jpg)
Regards Tony.
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A terrific model Tony. :bravo :bravo