Plane very difficult or ''not possible'' to trim? (Grand Duke)
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TL;DR : This plane is fantastic. How do we properly trim this beast?
Hi, here is my first post. First of all, this is my new favorite plane. I bought the bundle. It will be my home for the rest of my world tour. It's really close to be A2A quality level, which for me personally, is a big compliment. I think it's the only plane I can qualify to be at this level, and for me, surpass the Milviz C310. I will definitively be following this amazingly talented dev and his next plane, the Beechcraft Starship.
One problem I have experimented, is that I cannot trim the plane. After 10-20 minute, the plane is still doing oscillating wave. When I think it's steady, a couple second later it just start to wobble again with no apparent reasons. There is another more experimented friend that also find this issue. We both love to hand fly plane, so I wonder if this has not been reported because people prefer using the auto pilot?
My first flight was great and the landing was smooth. This plane really feel more heavy compare to the Comanche, but at the same time, very responsive. Please forgive me if this is explained in the manual. I'm definitively going to read it.
Edit: I now have covered the manual in search of anything that could be of any help. I'm gonna test 2-3 things and be back with my result.
Thank you again for this wonderful plane.
: )
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I'm seeing this behaviour too, on Su15 with the Piston grand duke at cruise with power set (32in @ 2500rpm leaned 50 deg F ROP), trimmed level at a constant airspeed and hands off I always notice a very small drift either up or down start. Leave it for a couple of minutes and it swiftly develops into a unstable up / down oscillation until the VSI is swinging between maximum stops. I usually wrestle control back at this point but something seems very off here.
Not a real pilot but isn't a trimmed plane supposed to converge back to it's trimmed state (eventually) when disturbed?
Such a pleasant plane to hand fly otherwise.
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Aircraft that are inherently stable should converge back to their trimmed state, assuming their CG is properly balanced. However, not all planes are inherently stable, as stability is the opposite of maneuverability. Generally, the more high performance an airplane is, the less inherently stable it is.
All of that being said, I find the Duke to be quite stable when trimmed, and hand flying it is a joy.