What can make a model evevator sensitive? need some thoughts on subject.

Two main things that cause an overly sensitive elevator are Balance point too far back and/or too much throw on the elevator. The "right" amount of elevator throw is that which allows the plane to fly smoothly and responsively. More is not better, yet some people don't quite get that.

Are you trying to make one sensitive or figure out why one is sensitive?

It is also control touch. Sure you can blame some of it on the plane but to me, it's more a skill thing. need to get the feel of the plane

Thank you for your input Jim I will recheck the balance as I have cut down the elavator throw. thanks again for the help

Thank for the input

I am trying to find out why my p51 is elevator sensitive

A guy in our club has a U-Can-Do 60 and he let me fly it. I took off and the first words out of my mouth were "Hoe-Lee-SH**!" He had it set with extreme throws and neutral, if not tail heavy, balance. I have a sport plane that does 10 ft loops at full throw on half throttle. This thing was worlds more sensitive. We finished that flight at about 1/3 throttle and low rates.

I got it back down (miraculously) and handed him his transmitter and told him he was "knuckin futz" as he and his peanut gallery were laughing their heads off.

Nice plane, but I don't enjoy a model that sensitive. I'm already married.

C.G. and control throw. And, to some extent, shape. Having tapered elevators puts more of the area in the prop stream for high alpha (3-D) maneuvers.

Sorry but... [sm=lol.gif] ROLF etc.

I'm a fan of sensitive controls, i aim for 40deg of movement on most planes and rarely use exp. Imo, just because my car can do 120Mph doesn't mean i have to drive that quick, same with the controls, just because i can move the surface 40degrees doesn't mean i have to, it's just nice when you fancy messing about a bit [:-]

When flying a new model for the first time i normally have high rates at 40degrees and low rates at what the manual recommends, take off on low, get her trimmed, and so far without exception i always end up sticking to high rates, just can't get used to the soft controls



Anyway, assuming the CG is about right, you could look at adding some exp, or lowering your rates a bit

Could be too much throw.
Solutions: reduce throw or use expo if available.
CG too far off.
Solution: Check CG and move stuff if able or add weight as last resort.
It could also be the pilot, has anyone else flown the plane and verified this? Have to ask.

And if the CG is way tail heavy it'll require all your skill to get it down in one piece.

Darren

Hi

Whenever anyone else fly one of my planes they usually remark on how sensative they are. I do like a lot of movment on the surfaces and on fun fly type have the cg back quite a way back.

But i think the primary reason is that i pay particular attention to the linkages ensuring there is virtually no slop in them. If you move the stick the surface moves instantly instead of taking up slack first.

Simon

As noted above, elevator sensitivity can be caused by several things, Some are detremental to the aircraft survival (CG to far rearward comes to mind right away and should be corrected before flying again). The other can simply be to much throw. You can leave the throw the way it is and simply dial in some exponential. That will soften the throw for the first part of the elevator action but make it more severe as you move the sticks more to the end-stops.

If you are not going to fly very agressively, though, it may be better to simply remove some of the throw by changing the position of the clevis's on both ends. On the servo, move them closer to the center of the servo arm. On the elevator, move the clevis further away from the elevator.

There are always give and take issues with this, no matter what you try. The best of all situations is to have the most movement of the servo arm cause a movement of the elevator surface. This gives you the best resolution or precision. But there is always a give and take with THAT situation. It's never easy, as you can see, you have a lot to consider. But I would opt to moving the clevis out further from the elevator for a mechanical adjustment, which gives you less movement of the surface with the same servo arm travel.

Then again, there is always end point adjustments on a computer radio (as is Exponential, by the way) but is sort of the last resort. You lose resolution when you play with end points.

As you can see, you should to try to get the most advantage out of the mechanical adjustments before playing with computer inputs on the transmitter. (that goes for all surfaces.. aileron, rudder, and for throttle throw).

Hope this helps.

DS.

Whatbrand /size P-51?