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How to build a counterbalanced rudder

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Old 05-15-2010, 08:26 PM
  #1
jester_s1
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Default How to build a counterbalanced rudder

Been doing airplanes for a few years and I have an OS 25 that I need a home for. I found plans for a basic flat bottom so that's underway, but I can't find any procedures on building the rudders. I'm going to use twin rudders with one standard servo, so I supposed I need to put a counterbalance up front? Any of you guys have tips or photos of good rudder designs? I know how to install control horns and link the two rudders. It's just the actual building of the surfaces that I'm in the dark about.
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Old 05-16-2010, 03:38 AM
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Default RE: How to build a counterbalanced rudder

Jester,
Check out the Dumas Big Swamp Buggy it uses twin rudders.
I have ran one for years and  find no fault with the rudder design.
I would change to a pull,pull system, using two servo rods.
The rudders pivot 1/4 of the way back of the leading edge.
This makes the forward  1/4 of the rudder counterbalance taking  some of the load,
off the servo. Good luck  and happy building.

                        
                             Having this much fun must be illega


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Old 05-16-2010, 11:19 PM
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Default RE: How to build a counterbalanced rudder

Thanks for the tip. I'm building a flat bottom so that it can run on grass and such, but the drawings I found will be helpful. Any suggestions on how big the rudders should be? I'm thinking about 8x2 since I'm running a 9 inch prop, but that's really just a guess.
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Old 05-17-2010, 07:38 AM
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Default RE: How to build a counterbalanced rudder

That sounds to be a good starting point. The rudders is one of the things that need to be tested from boat to boat. Ex: heavy boat will need large rudders. You just need to try a few different ones.
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