You’re asking for a Masters’ level dissertation on pitch stability and control, all of which has been hashed over numerous times on these pages. Please read the archives.
Long story short: follow the plans and the QAC factory plans change notices. We don’t need any Q-pilots (you!) killed because they thought they could do it “better” without understanding what it is that they’re doing. If you’re flying without sparrow strainers (or their aerodynamic equivalent) you’re doing it wrong. If you’re installing an autopilot servo with the expectation that the servo can hold a bias force thereby permitting you to eliminate the spring, you’re doing it wrong. If you’re installing an autopilot without first having hand-flown the full flight envelope and adjusted the trim spring and sparrow strainers (both with and without using the reflexor), you’re doing it wrong.
David J. Gall
Humor me please, with a little bit of patience as I have only flown a Quickie once ... With a 2 axis autopilot and a reflexor, do I need the elevator trim spring setup at all?
I am asking for a few reasons ...
- I didn't really like the elevator pressure the springs created, I like light stick pressure like my RV4
- How much back pressure does the elevator need in climb? Too much for the autopilot servo?
- I have heard from a few that you solely trim your pitch with the reflexor in cruise alone.
- And lastly, one less piece of equipment I need to install and maintain is appealing but ...
What do I know? Knowing you, I expect a lively conversation so GO :-)
Robert "TheFrisco" Schmid
Love building planes almost as much as flying. Latest completed build is "Loki", a Chinook Plus 2 bush plane.