Today I got my replacement parts for my Mustang PTS MkII that I crashed into a fence, including a new wing. Since I had to transfer the alieron servo from the old wing to the new one, I figured it would be a good time to upgrade to functioning flaps.

I used two old servos from an alpha trainer I totaled last summer. They work, but when the flaps are in the extended position, they seem to be constantly grinding, as if they are binding with something, but they are not (I have checked this many times). Grinding might be a bit of a strong word, its very quiet, but noticeable. The flaps are a little stiff, and take a little force to hold in the extended position, but it doesn't feel unreasonable. If I use the travel adjust on my dx6i radio to reduce the travel, it will eventually stop the grinding noise, but only if I set my flaps to only extend like 10 degrees, which makes them pretty useless.

Then I got to thinking about it, and decided that in the air, when the flaps are extended, there will probably a lot of aerodynamic force on them, with the airflow trying to push them back to the retracted position. And the servos will have to fight this force. So the servos will basically be binding, or working really hard, anytime the flaps are extended in the air anyway.

Is this a problem? How much will it reduce battery life?

Thanks guys