Biplane setup questions - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-09-2008, 08:28 PM   #1
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Biplane setup questions

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I am flying a Dave Patrick Ultimate powered by a Saito 150.
I am still a bit nose heavy as I get a feel for this plane and how it handles.

Not sure where to start.....
Tonight I noticed that when I was flying knifeedge it would tuck towards the landing gear. I would then have to us up elevator to get it going in a straight line.
Would giving the upper wing some positive incidence help with this.

Also when I would add up elevator to hold it straight I would then have to add aileron in the same direction I had originally rolled or it would try to roll out of the knife edge.

I guess I would need to do some mixing here somewhere as well. Mixing is a whole new thing for me since this is my first computer radio ( DX7 )

So I am open to any tutorial and help you folks have to offer.

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Old 05-15-2008, 03:44 PM   #2
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Re: Biplane setup questions

The Ultimate should be pretty neutral in knife-edge. Pulling to the belly suggests tail heaviness, so recheck the balance per instructions first. If the aircraft handling is otherwise OK, and main-plane incidences and thrust line are spot on, try moving the balance forward in small increments and see if this improves the knife-edge.

Good knife-edge affects so many of our manoeuvers that it's worth the effort to get it right. Tex.
Tex Gehman, Winnipeg
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