REFLECTOR: Landing Gear Retract Prevention

[David Scharfenberg]

I  made an airspeed switch out of a washing machine water level switch. 
  Adjusted it to 80 knots.  Also installed a switch under the panel to 
bypass it if I want to (such as for a retraction test).

Dave Scharfenberg


On Oct 9, 2007, at 1:33 PM, Ron Brown wrote:

>
> The factory does offer a differential pressure switch that is 
> connected to
> pitot pressure.  It should be installed in the cabin (not in the nose
> compartment unless you want to run the static side of the switch to the
> static port) and is set to allow the gear to retract when airspeed is 
> above
> 4" of water or about 80 knots.  It is connected in series with the up 
> gear
> switch.  Normally open on the ground, closes at 80 knots.
>
> Mine works very well.  You will need to test it during each annual and 
> each
> time the plane is up on jacks.  To get the gear to retract, a jumper 
> will
> need to be installed across it. Just don't forget to remove it before 
> taking
> the plane off the jacks.
>
> Ronnie
>
> ----- Original Message -----
> From: "Richard J. Gentil" <richard at naples-air-center.com>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Tuesday, October 09, 2007 1:28 PM
> Subject: REFLECTOR: Landing Gear Retract Prevention
>
>
>> Does anyone have a solution to keep the landing gear from retracting 
>> on
>> the ground should someone accidentally select the up position on while
>> the aircraft is on the ground.
>>
>> Without drag braces, etc. I did not see an easy way to wire in a 
>> circuit
>> interruption short of something tied to airspeed. (Sort of like what 
>> the
>> old Piper Arrows used to do.)
>>
>> Richard
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