RCU Forums - View Single Post - Torque effect of larger engine on launching
Old 08-14-2004 | 05:32 PM
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Larry Driskill's Avatar
Larry Driskill
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From: Lubbock, TX
Default RE: Torque effect of larger engine on launching

Torque can be a problem, especially on launch before full effectiveness of the control surfaces is gained as the plane comes up to minimum controllable speed.

My LiteHawk RC is sometimes a bear on launch. Those times are when there is little or no wind to hand launch into, or when you have to takeoff downwind as was the case part of the time at the 2004 North Little Rock S.M.A.L.L.

With the LiteHawk it is the first 10 or 15 feet that can be tough. With no rudder available you have to resist correcting for torque, or rather attempting to correct, with ailerons. If you whip in a bunch of aileron right away you get either bad adverse yaw or a snap. But if you launch with the right wing slightly down and make the launch toss slightly nose down, the speed comes up pretty quickly and you only have to be disciplined and stay off the ailerons for a short count.

With an ROG set up nose or tail wheel steering can keep the takeoff tracking down the centerline until the rudder is effective, but with hand launches, and no rudder, the low right wing and level or nose down toss seems to be my best bet at success.