REFLECTOR: Squat-switch setting

[Ron Brown]

Yep.  There is indeed some leakage but not enough that it would pressurize the cabin.  I have a bulkhead above the canard (built into the canard cover), sealed with silicone sealant, and the elevator torque tubes have negative pressure after installing (your?) bumps in the fuselage in front of the torque tubes. I also sealed the nose gear pivot.  I don't get any cold drafts in the cabin when I lower the gear.

I have not measured the nose area pressure, but just looking at the open nose gear doors just shouts that there has to be a good bit of ram air pressure there.  On my second test flight, my gear would not retract.  I thought the squat switch had lost its calibration (very low pressure 4" of water as I recall).  After checking calibration and finding it ok, I found the pinched pitot pressure tube - pinched by a too tight tie wrap.  I decided that it would be easy to drill a small hole in the canard bulkhead and run the static side of the squat switch to the cabin.  No problems since.  

No one else has reported this problem, so probably this is a non-issue.

Ron
  ----- Original Message ----- 
  From: Al Gietzen 
  To: 'Velocity Aircraft Owners and Builders list' 
  Sent: Saturday, April 29, 2006 1:16 AM
  Subject: RE: REFLECTOR: Squat-switch setting


  Subject: Re: REFLECTOR: Squat-switch setting



  Al, that is about the same setting as mine.  It works fine - after I found a 

  pinched line going to the switch.  I also routed a line from the low side of 

  the switch to the cabin area. The open gear doors have got to be packing 

  some air in, perhaps not at pitot pressure but certainly above static.



  Ron



  Good point.  Do you have a good enough seal between the area in front of the bulkhead and the cabin that the pressure wouldn't be about the same?



  Al



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