Rudder Size
05-14-2005, 07:27 AM
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Rudder Size
I have noticed from pitchers from this site that the more experienced RC airboat builders
use a single air rudder,where I have always used a two air rudder set up,only because I had not thought of using one rudder,because two rudders should be more responsive than one. Like a car the two front wheels turn together giving excellent control.
The question I am asking are two or three rudders better than one? Or Is there a formula like the larger the prop blade the larger the air rudder?[:@] Also I thought that having two air rudders I can reduce their height thus reducing the CG ?Is this true. Lindsay
use a single air rudder,where I have always used a two air rudder set up,only because I had not thought of using one rudder,because two rudders should be more responsive than one. Like a car the two front wheels turn together giving excellent control.
The question I am asking are two or three rudders better than one? Or Is there a formula like the larger the prop blade the larger the air rudder?[:@] Also I thought that having two air rudders I can reduce their height thus reducing the CG ?Is this true. Lindsay
05-14-2005, 11:57 AM
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RE: Rudder Size
I use dual rudder for two reasons: my boat does turn better with two rudders, also it is easier to get to the engine for starting (pusher prop), which may not be so important with a puller setup. One rudder is easier to set up having fewer linkages. As with all aspects of this, you must find what works best for you. I've seen a rudderless airboat, recently posted at rcairboats.net under electrics. See what works. Sean
05-14-2005, 06:51 PM
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RE: Rudder Size
I use single rudders on most of my set ups, and have excellent response.
I think dual rudders aren't necessary for the smaller props (unless you are using a pusher set up), but when you get into bigger boats that weigh more and move a larger volume of air...dual rudders are suggested.
Dual rudders are more efficient but are not needed in every situation. My boats turn and respond nicely with the single rudder...I am able to do tight spins with no problem.
Once again...it is more of personal preference.
I think dual rudders aren't necessary for the smaller props (unless you are using a pusher set up), but when you get into bigger boats that weigh more and move a larger volume of air...dual rudders are suggested.
Dual rudders are more efficient but are not needed in every situation. My boats turn and respond nicely with the single rudder...I am able to do tight spins with no problem.
Once again...it is more of personal preference.
05-16-2005, 11:30 AM
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RE: Rudder Size
I once had 4 rudder set up on a Big Swamp Buggy - As it turned out the 2 Large rudders were outside the propwash and only worked at high speed so I added 2 small(2"x 3") rudders inboard Looked and performed excelent - BUT - I have just as much response and control with just one, sized appropriatly and hinged at the right spot. I use a flying rudder (just one hinge) attached to the back of the motor mount. Puller set up
