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Old 01-01-2004 | 04:04 PM
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rc flylow
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From: Friendswood, TX
Default Ground loops

I have a scratch-built bipe (builder designed as well) that is a significant problem in the take off. Once airborne it flys relatively well trimmed out and it lands OK. I have a built-in left thrust angle on the Magnum 61 four-stroke derived from washers under the right side of the motor mount (don't have a way to measure the angle precisely, but it looks like about 2 degrees.)

I know to keep the tail down with elevator on take-off until I get airflow across the fin and I know to keep some right rudder when the tail lifts until the plane gets some speed (the tail-dragger norm.) The problem is that I think the plane needs too much right rudder. I'm wrestling this thing down the runway (asphalt) and dipping wingtips all the way into the air. I've had a little better luck on grass. I've made sure both main wheels spin freely.

I'm flying it with a 12x6 prop. Would more or less left thrust be an answer to counteract torque or would I have better luck centering the engine thrust? Is left thrust the way to counter the problem? (My logic tells me if the airplane is wanting to go left on power that right thrust on the engine is needed.) I don't want to screw up the flight characteristics trying to compensate for hard take-off characteristics. (This bipe is more difficult to take off than a Cub - if you know what I mean.)

I'm up to experimenting but I'd like to do things in an aerodynamically sound manner, not just moving things around willy nilly.

Thanks for your help!