Friend of mine just landed his fine airplane gear up.
How about all you single chip microcomputer programmers out there
build a gear up landing alarm.

If the RPM is below 4000 and during the last three
15 seconds consecutive periods the altitude has
steadily decreased and the gear is still up turn
on the alarm.

Paul Lamar ...No rotor no motor.

_____

That could work.  Or how about taking GPS output and alarm if the  plane is
within, say 1 1/2 miles from an airport, and less than 1000' AGL  and the
gear is up.

The AOA pro is nice; so are radar altimeters; but we need something  for
about a third of that cost.

Al

Yes that would work if you could figure out how to get an
airport data base. Way back when GPS was new I could get the
FAA data base on nine track tape from Ross Perot's old outfit
Electronic Data Systems. They had the contract with the FAA to
maintain it. I used it to write my moving map software
that ran on DOS. There was a couple of articles in Kitplanes
in 1989 and 1990 about my moving map software.

I still have a nine track tape reader in the hangar. I have no
idea how one obtains the data base today. Perhaps Jeppeson will
sell it.

Paul Lamar

Paul,
I have seen many places  sell back up automobile warning detectors,
even some of them have digital counter.
the bad part is the longest range I have seen is 11 ft. But 11 ft may
be enough to power up and go around?
Buly

That is a good idea. Something cheap off the shelf.
Perhaps those ultra sonic radar transmitters can be souped up
for more range.

-- 
Paul Lamar ...No rotor no motor.

On downwind a couple of  years ago saw  a 210 gear up at 20' on short final.
By the time I had finished a "pull up NOW" call the guy was in the flare. He
reacted quickly but still managed rip three antennae off the belly. Somehow
there was no propstrike so perhaps short range might not be too bad. However
what is wrong with KISS, a MP sensor in series with a gear position switch
and annunciator of some description. Perhaps a throttle position sensor or
normal open spring loaded in switch series ?

John Gibbons


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