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11-01-2010, 06:40 PM
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Join Date: Nov 2005
Location: Palm Beach Gardens, Fl
Posts: 402
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Squat Switch Ideas
I've been studying the new SkyView transponder installation and see the option for a Squat Switch. Has anyone used a Squat Switch to turn the TPX from ground to airborne operation?
I was thinking some kind of switch on the tail wheel. When on the ground and flexed up it would be open circuit and close as soon as off the ground and unloaded.
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Bud Smith, RV-8, ECI IOX360 , Dual PMags, Dynon SkyView, Whirlwind 200GA, IFR and N88ZP has "slipped the surly bonds of earth".   
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11-01-2010, 06:47 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Interesting idea.
Give Dynon a call. They have some very smart people there who might take up that challange.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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11-01-2010, 06:56 PM
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Join Date: Aug 2005
Location: Mendon South Carolina
Posts: 1,391
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Milt Concannon
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11-01-2010, 07:20 PM
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Join Date: Feb 2006
Location: San Diego, CA, U.S.A.
Posts: 770
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Quote:
Originally Posted by N395V
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Should work, but it seems silly to have to add another piece of hardware when the EFIS already has more than enough information to generate this output. You could generate a virtual squat switch to turn on the transponder on takeoff based on airspeed (as that device does), GPS speed, vertical speed, or engine RPM, any of which the EFIS already has. I don't know anything specifically about the Dynon, but talk to them. If they don't do this already (they probably do), I would think they could easily whip it up for you if there's a free I/O pin. |
11-01-2010, 07:24 PM
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Join Date: Nov 2005
Location: Palm Beach Gardens, Fl
Posts: 402
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Nice suggestion Milt, but
According to the Dynon documentation: "This must be a mechanical switch that accurately reflects the aircraft?s on‐ground status. Mode‐S certification requirements state that this cannot be a simple airspeed switch."
I posted this question on the Dynon support forum too.
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Bud Smith, RV-8, ECI IOX360 , Dual PMags, Dynon SkyView, Whirlwind 200GA, IFR and N88ZP has "slipped the surly bonds of earth".
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11-01-2010, 10:36 PM
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Join Date: Aug 2009
Location: Southern California
Posts: 877
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Squat Switch Required?
Quote:
Originally Posted by dbuds2
According to the Dynon documentation: "This must be a mechanical switch that accurately reflects the aircraft?s on‐ground status. Mode‐S certification requirements state that this cannot be a simple airspeed switch."
I posted this question on the Dynon support forum too.
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Well, it seems that the folks at Garmin have figured out how to do this legally without a squat switch. My GTX330 switches from standby to Mode S automatically when I take off, and back to standby when I land. I don't recall the specifics, but I think it uses GPS ground speed to do this.
Skylor |
11-02-2010, 03:01 AM
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Join Date: Oct 2009
Location: Sydney, Aust.
Posts: 820
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Would an airspeed switch wired in series with a mercury tilt switch work for you? The airspeed switch would ensure it was deactivated above a certain airspeed, while the tilt switch would require a nose-high attitude in conjunction with no-airspeed to close the circuit...
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RV-9A - Finished on 10th February 2016 after 4 years, 9 months and 19 days! The 1020th RV-9 flying.
First flight 26th March 2016. Essential specs 145KTAS @ 2400RPM, 8000', 24.2LPH, Initial RoC 1800FPM.
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11-02-2010, 06:21 AM
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Join Date: Feb 2006
Location: Davis, CA, USA
Posts: 539
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mode S or C?
Quote:
Originally Posted by skylor
Well, it seems that the folks at Garmin have figured out how to do this legally without a squat switch. My GTX330 switches from standby to Mode S automatically when I take off, and back to standby when I land. I don't recall the specifics, but I think it uses GPS ground speed to do this.
Skylor
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I've seen these on G1000 systems, but they had mode C-encoders.
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Jeff Caplins
California
RV7 N76CX
(started: Feb 2002 --> Completed: May 2016)
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11-02-2010, 06:23 AM
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Join Date: Feb 2006
Location: Davis, CA, USA
Posts: 539
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[quote=dbuds2;481183] "... this cannot be a simple airspeed switch."
[quote]
how bout a really complex airspeed switch? 
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Jeff Caplins
California
RV7 N76CX
(started: Feb 2002 --> Completed: May 2016)
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11-02-2010, 06:29 AM
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Join Date: Feb 2005
Location: Shawnee, Kansas
Posts: 804
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Quote:
Originally Posted by KRviator
Would an airspeed switch wired in series with a mercury tilt switch work for you? The airspeed switch would ensure it was deactivated above a certain airspeed, while the tilt switch would require a nose-high attitude in conjunction with no-airspeed to close the circuit...
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What about S&L unaccellerated flight? Mercury goes center... Mode-S turns off |
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