Kitchen Rudder

[steamboatmodel]

Model boat had an article called:
A simple ‘Kitchen’ type of rudder for steam powered models by Glynn Guest - 14/2/08
Does anyone have a copy of this article?
Regards,
Gerald.

[derekwarner_decoy]

Hi PD's.....no Gerald I don't subscribe to the said publication.....but  ...we have an excellent kitchen rudder artical in our down loads ....Derek

[steamboatmodel]

Hi Derek,
"we have an excellent kitchen rudder artical in our down loads .."
I have looked and can't find it, can you point it out to me?
Regards,
Gerald

[mjt60a]

I have that issue, it's basically a pair of rudders placed either side of the prop, with the top and bottom edges bent over toward the prop. They work together (remaining parallel to each other) for normal (ahead) steering and bring the rear ends together for 'astern'. He said they work pretty well if you want to use a simple engine that can't stop or reverse, such as a Mamod marine engine....

[steamboatmodel]

Its not the bottom part I am having problems with, but the top part and how you connect the control arms to the servos. I have a set done up similar to the set pictured, but ran into space problems setting up the servos.
Regards,
Gerald

[derekwarner_decoy]

Hi PD's.......just  Gerald........the following should work ..just read the words...

1) the vertical axis of the rudder pintal is 1/8" brass rod & is soldered to say the [plan view] stdb bucket on both top & bottom - this pintal is a clearance fit in the rudder lower support so the stdb bucket can rotate
2) the 1/8" pintal is connected to a push/pull cable & in turn the cable is connected to a servo crank

3) the port bucket is soldered to a 1/8" ID brass tube on to & bottom [you know ...that K&S brass telescoping stuff - the connection between the 1/8" OD pintal & the 1/8"ID tube will need a few 1/8" brass washer soldered to act as keepers between the two elements & also as basic thrust washers and connected to a second servo via a push/pull cable & in turn the cable is connected to a servo crank...the second servo is wired in reverse or is it called by a Y cable?

The only issue I see is setting the crank lengths accurately positioned & set......& possibly needing a digital proportional Tx & Rx to be able to set the required rudder component movements

The actual location of the servos is non critical from a functionality aspect...same for the push/pull cable lengths...they can be of differing total lengths...it is the resultant servo arm movements which must be equal.... ........

I will post this now & knock up a rough sketch.....Derek


 

[malcolmbeak]

This is one I made years ago - it worked fine.
Malcolm

[malcolmbeak]

Oh!! I thought I had put rather more pictures here. I'll try again.
Malcolm

[derekwarner_decoy]

Hi PD's ....& thanks Malcolm......naturally I had never seen the examples before ....but just guessed on the functionality etc ....Derek

[Roderick Smith]

I had never seen one of these before, but I am struck by the resemblance to the clamshells fitted to some jet aircraft (notably Fokker F28) to provide reverse thrust without having thrust reversers.

Regards,
Roderick B Smith
Rail News Victoria Editor

[derekwarner_decoy]

mmmmmmm thinking back PD's ...30 years ago I flew from Sydney to Perth on a 707,,,,then from Perth to Karratha on a Mc Robinson Mc Millar Fokker F28....all one class... ...but mainly fly in workers returning after a weeks leave

I was called to play  with the problematic main engine Woodward governer hydraulic amplifer pump system of a 100,000 tonne Australian vessel on return from drydock in Singapore

The F28 flights were supurb  ...& much better than the previous F27s turbo prop......... .....Derek

[steamboatmodel]

Hi Malcolm,
Maybe I need more Coffee, but I can't figure out where you connect the servos on the one you show? It definitely looks more compact than the design I had worked out. Do you have a shot of it installed in a boat? Maybe that would sink in. I am trying to do this with mechanical mixing rather than using a radio with mixing on it, but I may break down and do electronic mixing on this one, and then build another hull with the mechanical mixing in it.
Thanks all,
Gerald.

[mjt60a]

The Model Boats article used, as I said, TWO rudders, not a 'real' kitchen rudder. There was a servo connected to each. I think he used one of those programmable transmitters because the steering stick operated both servos (to turn left and right) and the throttle stick caused them to move from parallel (full ahead) to rear edges touching (full astern) with a mid point producing no movement of the boat in either direction as some prop wash went through a small gap between them while the rest was re-directed forward.
You could read it on  http://www.modelboats.co.uk/  though you have to join first, but if you already have a 'proper' kitchen rudder with a single pivot point for both halves (like the pictures shown) the MB article won't be of any use...
(by the way, the article appears in the january 2008 edition)

[kno3]

Very interesting topic. I'm thinking of using a Kitchen rudder too for my next boat project. I have looked at the model boats website but the article about the rudder seems to be accessible only to subscribers of the magazine, no way to get or buy it separately. And I don't think the magazine is available in Germany. Could anyone help?

[steamboatmodel]

Thanks for the explanation Nick, The simplest way for now will probably to use an electronic mix either in the transmitter or a separate one hocked up to the receiver. I will post when I get it done.
Regards,
Gerald