too much elevator?
 

Generally... the throws recomended for a trainer are WELL below here the surfaces start to lose effectiveness from excess deflection.

On a typical model, flying about 50 to 80 mph, the control surfaces will still be effective at over 45 deg deflecion. The increase in force on the control system becomes greater compared to the resulting control effect asthe surface is deflected more, up to appx 60 deg, where practically any control surface starts to just be a drag source, rather than having the intended effect.

I doubt that excess travel was the cause of the crash. The description is typical of a model which was stalled, and the elevator pulled hard, before the plane had time to gain airspeed. If the CG was forward, and other conditions were compounding the problems... its easy to have the plane continue in a dive with full up elevator, holding the angle of attack of the wing just right to prevent gaining airspeed to unstall the wing. (one of the few cases where too far forward CG can kill a plane, without preventing take-off.)

too much elevator?
 

Another possibility is to flimsy of a push rod on the elevator. The forces on the moveable surface go up with the squre of the increase in velocity. If you have weak or readily bendable push rods, they will bow rather than move the surface. This is especially bad if the push rod is in compression for the "up" command. Keep stiff (heavy gauge wire or wooden dowel) pushrods with very little unsupported length at the end. Many of the trainers have a long section of unguided or unsupported 1/16 inch wire at the rear end which is an accident waiting to happen, especially it the plane is overpowered or you go into a long extended vertical dive.

too much elevator?
 

Yes, loss of battery power to the RX can easilly cause control problems, including making the servo unable to operate the elevators. :rolleyes:

You wouldn't have happened to check voltage afte the crash.... ?

too much elevator?
 

One question . . . . why is this in the BEGINNERS Forum????

too much elevator?
 

Because he's a relative beginner... asking a question, hoping for an answer from more experienced flyers? ;)

too much elevator?
 

If he's doin' torque rolls, he's NOT a beginner. I appreciate asking questions, but I think askiong in the right forum would be much more profitable.

VP

too much elevator?
 

Only a beginner would say anything about a "high stall torque roll"... There's a snap-roll, which is a stall maneuver... and then the torque roll is done by hanging from the prop, from a hover. There is no such thing as a "high stall torque roll."

too much elevator?
 

So a plane that is "hovering" is not in a stall situation?? I contend that it is. Just my humble opinion.

VP

too much elevator?
 

A stall implies that the wing is SUPPOSED to be flying. A torque roll... by definition, the wing isn't flying... its hanging like a dead weight from the fuselage and therefore, from the prop.

How do you stall one torque roll more than another?

No one who knows anything about aerobatics would call it anything other than a Torque roll... adding "high stall" proves lack of knowledge. trying to say its valid to ad that... proves your lack of knowledge. :p

tried everything?
 

when you say you tried everything on the first crash to stop the dive, then down elevator would have pulled the plane out inverted, if the pushrod siffness WAS the problem. Tone down the throw man.
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