stephen barnes

Hi,

I've just finished my new Orion-E, built after a 10 year break from flying.
I'm having problems getting it to fly well under power though. I've set the
CG to the recommended place, and it glides quite nicely. However despite a
lot of tweaking it is horrible under power, the nose goes almost vertical,
and using the elevator to stop this makes it really squirm left and right.
The motor is a speed 400 with Rondo controller and Gunther prop, and
batteries are 7*1.0Ah hecells from Overlander. So far I've put more
downthrust on the motor, which does nothing, and i've chocked the wing up at
the front, which has helped a bit.

Can anyone make any suggestions?

paul mcintosh

Strange that propping up the front of the wing helps. I would expect just
the opposite. The reason the nose goes up is because of the extra lift
generated by the higher speed under power.

--
Paul McIntosh
Desert Sky Model Aviation
http://fly.mcintoshcentral.com

the natural philosopher

I'd agree with paul. Put the wing back where it was and move the CG
back, and ad some down trim to compensate. Check for wing warps to.

tom gaskin

Hi,
I've been flying my Orion E since the beginning of the year, and yes - if
you trim it as per the instructions it will thermal a treat but will pitch
up almost vertical when you apply power.

I added a bit more downthrust to the motor which helped, but I eventually
used a free mixer on my transmitter to mix in a smidgeon of down trim (about
2mm down at full throttle) as you apply power.

Now it climbs at about thirty dgrees on full throttle, and transitions into
a nice glide as you shut the throttle.

Mine uses a Graupner 400 SPEED GEAR 4:1 with an 11 x 8 J.Perkins folding
prop.

Once sorted a very enjoyable model...

Regards,
Tom Gaskin