It's the latter, Although it would be nice not to need any trim, what i do not want is to need massive amounts of trim to hold the nose up (or down). My current aircraft had a nose-down tendency and no amount of trim would alleviate the pitch down when pulling off the power. I eventually found out that the fix was a CG issue. Since the baggage was empty, I was usually toward the front of the CG range, but with weight back there, the plane was a whole different animal at the aft CG limit. Other owners noticed the same. Faster cruise, no lawn-dart tendencies or stick forces needed to hold the nose up. So I called the designer himself, and he informed me that this was no surprise, the aft limit was quite conservative, so flying at the aft limit was a good way to get a balanced situation. I could load the baggage compartment and adjust power any amount and still be able to keep it level hands-off the stick. This KR conversation concerned me because of the stabilizer incidence issue. I do not want to build in a pitch tendency and then have to fight it with trim, or worse, have full trim and still have stick forces at various power levels. I'm hoping to choose an incidence that is balanced and, along with a good CG, will allow me to reduce power on approach without having to crank in tons of trim and still have to hold the stick back. Because of all the fiberglass etc, this is one area I need to get right during the build, if possible
> > I want neutral trim at all speeds from 60mph to 200 (if my build > > is non-LSA spec) > >+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > If you are saying you want to build a KR that requires no movable > pitch trim tab, you've got a tough hill to climb. Every airplane is > full of compromises, what works at one speed is wrong for other > speeds. No airplane I've ever seen or flown requires neutral trim at > all speeds. Some aircraft have such a small speed envelope that when > set up correctly they really don't require pitch trim tabs. Variable > pitch propellers are another example of where you need to change > characteristics of components depending on speed. Then there are > flaps, lead edge slats, etc. > > If you are saying you want zero control forces at any speed, then > it's just a matter of sizing the tabs and building in the necessary > range of movement. > > Larry Flesner > >
