quote:

ORIGINAL: AA5BY

Didn't get to fly the Sport Thirty-Five this weekend but might tomorrow afternoon on the Fossil Fliers Tuesday afternoon session. Several changes (going against the rule of one at a time) were made.

1. Moved CG forward 1/4'' from original point and 1/2'' forward from last flight

2. Reduced elevator throw (each way) from 1.75'' to 1.25'' as well as reduced expo from 60% to 40%

3. Added 1/4'' up trim to the ailerons in the second flap position (both flap positions have the same setting). So, flap1 is just 10deg flaps whereas flap2 adds the crow. This might require adjustment of the elevator mix in the flap2 position

4. Corrected non linearity in elevator servos... reduced the slave to 95% throw each way

5. Mixed a slight bit of throttle increase with flaps, which prevents pulling the power off too much as this engine will idle down to hardly any thrust

quote:

ORIGINAL: da Rock

quote:

ORIGINAL: AA5BY
My first thoughts before sleeping on things is to reduce elevator travel and increase expo now set at 60%, move CG forward a tad and reflex the ailerons up some with flaps engaged. If that doesn't stop the nastiness and test show it to be flap related only... the flaps will be abandoned. The landing switch might be set for a few more rpms as well.

hmmmmmmmm

My first inclination would be to take it up high and try to duplicate that stall. It only happened once and could have been a couple of things with that one approach. A slight gust, wind could have shifted, you got it slowed down more than the previous finals.....

One thing that sticks out is your 60% expo. That's a lot. Some systems get real snakey when the expo gets into the upper ranges. They will start acting like on-off switches. Or we start actually flying our slow flight with the stick about 1/3 from center because center doesn't do spit any more. I've seen TXs that didn't seem to move the surfaces at all around center when the expo was up there. The guys wound up flying the plane from 1/3 stick out. They'd adapted and didn't notice they never gave the stick just a touch when a touch was all that was needed because the surface never moved. You might get a buddy to watch your TX/sticks while you fly.

I found one TX that needed the EPA taken back to 100% to get the expo to work right. It was a witch to fly that sucker but the owner had gotten used to it... mostly. And he thought he'd just gotten old and lost his touch.