Paddleducks
Paddler Modelling => Construction => Topic started by: Eddy Matthews on March 01, 2008, 07:07:20 AM
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After saying for many years now that my favourite paddler is the Glen Sannox, and promising to build it "one day", that day has finally arrived!
I've cut out the bulkheads, mounted them on a building board, and have just begun the laborious task of planking the hull - This will be used as a "master" to produce a fibreglass hull later.....
There's nothing much to see at the moment, but pictures will follow is I progress - if it's as quick as my other builds don't hold your breath waiting though!! ;)
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Hi PD's....here is another snap Eddy.... of PS Glen Sannox steaming in the other direction :terrific :shhh...
a) are you building @ 1:48 scale?????
b) will you be using your steam plant from B,H&M?..or is it [Mb&H] :sorry :shoot...or [MH&B]
c) will you be using the feathering wheel set from paddle maker Mike Mayhew.......?
Hurry up with the build snaps :crash :clap :picknose...we are all getting a bit bored :ranting :nahnah here
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Hi Derek,
yes it's at 1:48 scale, giving a model approx 67" (1.7 m) long....
The method of powering hasn't been finalised yet - But in the hope of using steam, the hull has been increased in draught to allow for the weight of a steamplant.
The wheels from Mike Mayhew are too small, so that's something else that needs to be sorted. I won't be needing thos for a long while yet, so I have time to look around or even fabricate some.
Not much point inposting photos of a few scraps of wood that don't really look like anything yet, but photos will appear shortly ;)
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Hi PD's......I am going to stick my neck out here :shoot.......& suggest Eddy..that @ 1700 mm model length...if you increase the scale draught/draft ratio over the original ... :crash....you will only lower the metrecentic point of balance & hence need more [plumbonium] pB to compensate.....
:thinking about this for the last hour or so I needed a :beer...or two
So.....we should ask our resident 'Moritz' for his mathmatical WISDOM...opinion...as my guess is that the scaling factor [in this specific case....larger models to scale ] has again caused a scaling confusion
My experience is with Decoy...where I have found the above to be fact..............
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Good to hear that you are doing one for yourself Eddy. It is welcome news that there is the fruition of desire coming from the early blossom of spring. Only thing about this is is threr sufficient time for the Padler day in September ? Oh and by the way I do hope you have not misplaced those lenghts of 5mm Silver steel for the drive shafts.
cheers
Jim
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Hello, dear Eddy,
very elegant ship. I think the grace of it will continue in the performance in sailing, when it is finished.
Those british paddlesteamers combined outer elegance with excellent construction even in details!
Kindly regards
Thomas
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On the off-chance that you haven't already seen it, here is a photo of Glen Sannox from "Clyde Shipbuilding from Old Photographs"
Rick
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Thanks Rick, I've never seen that photo before.... It's now added to my collection :)
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I haven't had a great deal of time to work on Glen Sannox recently, some family problems to deal with, the website move, and the appalling weather we've had over the last few weeks - In fact everything seems to be conspiring against me! :(
Anyway, the hull - which will be used as a master to make some fibreglass hulls, is coming along. Still a lot of work to do to it, but at least it's starting to take shape.
Here you can see it as it is now - One of the photos shows it standing against a standard 2 metre high door, just to give an idea of it's size.
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Hi Eddy,
Looks like a great start. When you mentioned the size "approx 67" (1.7 m) long" it really didn't sink in until you posted the photos. 67"/12" = 5' 7" that's one large hull, have you calculated what the weight will be ? and do you have a vehicle large enough to transport it? There was one of the Toronto Club members who when buying a new station wagon took his tanker model with him to the showroom to make sure it would fit (Model was 6' 3" and weight 67 pounds if I remmember correct) it sure was a pain to load and unload.
Regards,
Gerald
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Hi Gerald,
Yep it's a big hull - To be honest I didn't picture quite how big myself until I started to build it!!
I've got an 8 seater MPV, so plenty of room to haul the beast around. All the back seats fold up to give a massive load area, you can see it at http://www.paddleducks.co.uk/smf/index.php?topic=2978.0
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I'm watching with interrest and some envy, I was thinking of the same boat but maybe smaller allthough the size is only a problem when storing and transporting. I will be intrested in the finished weight.
Any how good luck
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Once I get the fibreglass hull made I'll test it on the water to see just how much it will weigh when ballasted to the waterline. The hull has been increased in draught to make sure I have plenty to play with - I'd rather add more ballast than find I have a model that won't take the weight of the necessary drive system etc etc.
I have done some rough (very rough!) calculations, but I'm keeping quiet about those until I have the real figures to hand, then we'll see how close I was! And yes I'll be honest when the time comes :)
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Hi PD`s,
the GRP hull of my model of the Jeanie Deans is about 2.40m long but made from the shipyard drawings, i haven`t increased the hull i thought there will be enough place for ballast. When i have made the first test on a lake to see how heavy the model will be i discovered a total of 19 KG or 41.9 pound.
Regards Hans
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Hi PD`s,
the GRP hull of my model of the Jeanie Deans is about 2.40m long but made from the shipyard drawings, i haven`t increased the hull i thought there will be enough place for ballast. When i have made the first test on a lake to see how heavy the model will be i discovered a total of 19 KG or 41.9 pound.
Regards Hans
Did you estimate the weight of the model before construction Hans, and how did the figures compare?
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Hi Eddy,
no i started building of the mastermodel, made a mould and laminated my hull only by my own opinion i thought it will be allright and so far it seems to be OK, the weight of the hull only is 3.5 KG around 7 pound.
Regards Hans
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Hi PD's ......calculating the displacement [:nono not weight] of the model prior to manufacture is not difficult :hehe
1) go to the green grocer....select three empty polysterene brocilli boxs & tak'em home for FREE
2) cut into 300 mm long x 50 mm wall thickness x the beam [width] of planned vessel
3) laminate with contact glue sufficient layers to a keel level to deck level height
4) roughly sand the bilge keel radius to both sides
5) scribe a TEXTA line of the proposed water line
5) take to the test tank [bath] & place the kitchen or bathroom scales & exert a downward force to equal the dispalcement @ water line...record this value [in kg's]
= result 1
Repeat steps 1), 2) & 3)
6) roughly sand the next 300 mm long section to represent the bow section
Repeat steps 5) & 6)
= result 2
Repeat steps 5) & 6)
7) Same applys for an AFT sanded section...
= result 3
So if the 1:48 model of Glen Sannox was 1700 mm long.....the confirmed displacement would =
Total displacement = result 3 + result 2 + [the middle bits ....or 3.66 times the weight of result 1]
This is totally true & so simply effective as we consider only displacement... not weight of materials
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OK PD's ...I am asked a question OFF Line.....how do you calculate the bow & stern sections?
1) use the same rough sanding method to shape the sections & by eye....to best suit your plan
2) divide each 300 mm long polystyrene section by 10 & superimpose these with TEXTA as frames over the section
3) using a piece of string, gauge the total length from water line to water line over each frame line & record the dimensions
From this a table of dimensions can be established...these cordial lengths can also be used in later planing
After all....the Vikings & Romans used similar principals many years ago & before :breakcomp :sobbing :sorry :towel :towel