Hi all,
Just to change the key of the song song and get some relativation. Hate to
do that, but i also feel kind of responsable if i did not say what i think
needs to be said. Apart from not liking the idea of "soldering iron
handicapped" fellow builders to work on flying controls with complications
they do not grasp, there are some facts to be considered.
On sun and fun i have been talking to almost every autopilot producer for
experimentals. Both digitrack and trio do a simple attitude hold. Both use
an extra servo. Both told me things i had not considered before. Both sell
for a price which is a multiple of the thing we are talking about here.
Why? Does the competition not work or?
Imho,
1: The ray allen trim motor is probably just good enough for trim. I
wonder if it has the reserves to fly the plane.
2: EZ-trim has had problems in the software, it is very difficult to get
the software working without hunting or undershooting. Once there is a
more or less stable situation, changes in the flying characteristics will
not readjust the adjusting cycles. That was the main reason the Dutch
abandoned the idea.
3: There is no insane command override other then the pilot. If, say
because somebody opens a vent, hence pressure increase, hence correction,
the plane ends up in a nose high attitude with 40 knots airspeed, it will
still try to pith up.
4: There is no cut out on turbulence, insane commands might follow.
Ok, let me have it <grin>
Jos Okhuijsen
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