On 11/18/2020 2:19 PM, Jeff Scott via KRnet wrote:
My reasoning follows: The slower you go, the less effective your trim becomes.
So, for your trim to be effective enough to have a shot at landing the plane
with trim only (A requirement I set for mine), you need to have a longer throw
to get as much nose up trim as possible for slow speed.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I've tried to control pitch with trim only to simulate loss of pitch
control several times. I'm convinced it's not the length of throw, if
total travel is adequate, but the speed of the actuator. With my setup
by the time I start to get the change I want I've gone too far. I get
in to PIO in about three cycles. I might be able to keep from going in
vertically but it's not going to be a pretty sight. I hope to never
need trim to land as I doubled the elevator control horn, possibly the
weakest link in the pitch system and the only cause of a loss of pitch
control accident I'm aware of.
As far as mounting my actuator, I simply removed foam to make a cavity,
glued in a piece of 3/32" ply for a platform and used very tiny screws
to mount. It doesn't take much.
https://www.dropbox.com/s/iyqod5cb5pmeom3/IMG_8615.JPG?dl=0
A simple cover
https://www.dropbox.com/s/pggv503t8li98om/IMG_8613.JPG?dl=0
Larry Flesner
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