REFLECTOR: How should my elevator trim motor perform at 80-90 KTS?

[John Dibble]

If you can trim for hands off, then the elevator moved enough and it
doesn't matter how much the elevator moved.
I don't recall having looked at the elevator position while in the
pattern.  I can tell you that if you trim the elevator for hands off at
short final, after landing it should be in about the same position as
when you trimmed it for takeoff (assuming it was trimmed correctly for
takeoff.

I don't see how you can have the elevator below neutral at 150 kn,
because that would put you in a climb and your speed would drop way
below 150.

John

Dennis Martin wrote:

> I took my first flight in N767DG last Thursday. What a thrill. All
> went well except for the trim. It seemed not to move the elevator
> much. Not sure if I held the button down long enough, so it could have
> been me being impatient. If you're flying, here are my questions:
>
> 1. Say you're on downwind doing 90 KTS.  Approx how many inches down
> is the trailing edge of your elevator? (Down from the neutral
> position)
> 2. On final over the numbers, approx how many inches down is the
> trailing edge of your elevator?
> 3. In cruise (over 150 KTS) can trailing edge of your elevator
> withstand the load of the air enough to drop below neutral using the
> trim motor? If so, how much?
>
> Here are the numbers for my elevator sitting in the hangar - inches up
> or down from neutral:
>
> Max. down with trim motor = 1.75"
> Max down pulling stick back all the way = 2.25"
>
> Max up with trim motor  =  1.5"
> Max up pushing stick forward  = 2.25"
>
> Thanks in advance,
>
> Dennis Martin (173 FG Elite)
>
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