I was concerned about a trim runaway and made some testing about ten years ago.
---From my notes, this is what I found:
1. At cruising speed, trimming full nose up and trying to stay level requires an
extreme force and it was nearly impossible to avoid climbing. After reducing
power and speed to 70kts, the push force becomes manageable but is still high.
I thing a landing in this configuration would be possible but difficult (I did
not try!). Turning helps reducing the push force
2. At cruising speed, trimming full nose down and trying to stay level requires
a good pull force but it is manageable. At lower speed the push force becomes
quite small and landing would be easy.
Of course those findings are for my own aircraft and could be slightly different
for others. The results would also be affected by weight and balance.
I also have both roll and yaw electric trims but a runaway of those trims is a
non issue as the generated stick forces are very small.
Remi Guerner
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