The down trim is needed, to alter the absolute angle between the wing and
the stabilizer, which is the effective wing incidence. Don't worry about
that too much, You might decrease wing incidence, but it is not absolutely
When the plane dives on more power, there are two things to watch for.
1) does it do so immediately, and before the plane speeds up?
2) does it do so <AFTER> the plane speeds up?
case 1): reduce down thrust of the engine
Case 2): your CG is way aft, which also to some extent explains the needed
I hope this helps you out
P, from Arcen, south-east Netherlands
> Hello friends,
> I had trimmed my RCM on mid throttle.
> When I am opening the throttle to full power it dives.
> Do I have to lower the engine thrust angle or to rase it up?
> My common sence tells me that the engine thrust angle
> was to high,and therefore a down trimm was required
> on mid throttle.
> when the throttle is opened to full,
> the down trimm takes a larger affect and the RCM gets pitch down
> and dive-> the angle must be lowered and a new trim is required.
> What do think?
> just remmember,the throttle is being opened from mid to high