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01-30-2014, 11:20 PM
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Join Date: Oct 2009
Location: Thousand Oaks, California
Posts: 25
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Kill Switch
Hello all,
I'm looking for some advise as to how to wire a kill switch to deactivate the rear stick while the pilot in front is flying or visa versa. This needs to be done so there are no "counter inputs" to the flap or trim motors as well as keeping the kids from hitting the additional switches on the stick (flaps, fuel pump and A/P disconnect). I've heard some say just send all the grounds to a single switch but have also heard others say you need some sort of rotary switch. Any suggestions? I dual infinities with trim, flaps, PTT, A/P disc, Boost pump, and transponder ident. Thanks!
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01-31-2014, 12:53 AM
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Join Date: Aug 2011
Location: Monterrey, Mexico
Posts: 121
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Gimme a break
What about wiring each stick to a separate breaker?
__________________
Miguel Vidal
EAA #1133587
RV-8 SB Wings in Monterrey, Mexico
N511MV Registered
MyKitLog
Last edited by mvidalr : 01-31-2014 at 12:53 AM.
Reason: Typo
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01-31-2014, 04:01 AM
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Join Date: Feb 2005
Posts: 1,082
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Just send all the grounds to a switch. That was the advice given to me by Mark Ausman of Vertical Power. I am doing exactly that on the RV8 build.
__________________
Mike
JAMES AIRCRAFT.com
Flying - RV8 Hot Rod "Drone Killer"
Flying - RV8 "Look'n Good"
RV4 - FAST & FUN! Rebuilt, Flown, Sold
RV-7A Built, Flown, Sold
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01-31-2014, 06:11 AM
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Join Date: Jan 2005
Location: Watkinsville, GA
Posts: 626
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I sent all grounds but ptt(transmit) to one switch, and the ground for the ptt to another. I put two switched on my right gear tower so I could see them , but they are out of the way. 500 hours, many back seat riders, lots of young eagles and no problems at all
__________________
Marshall Jacobson
"Miss Sue"
RV-8 80749 slow build taildragger
7.5 year build first flight Dec 2005
SOLD at 540 hours and 10 years of FUN
N68AK
Watkinsville, Georgia
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01-31-2014, 06:20 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Different approach...don't put buttons on the stick.
I have A/P disconnects (separate pitch and roll), trim, and PTT in the forward corner of the left rear armrest. The rear stick is instantly removable; just pull the quick-release pin. No wires.
BTW, make your own choices of course, but why flaps and fuel pump in the back? Neither is necessary for a pinch-hitter.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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01-31-2014, 06:32 AM
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Join Date: Nov 2011
Location: Glen Burnie, MD
Posts: 94
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Stick Electrical "Mixer"
Over the past couple of days (being snowed in) I built a box that will "mix" the signals from the two cockpit stick switches and interface with the aircraft (VP-X). As others have suggested, I used a DT3P switch to isolate the grounds. I can select FCP, RCP, or both. In the "both" setting, both sets of switches have a tie to ground so there is the possibility when both sticks activate a switch simultaneously that strange things could happen.
With the VP-X there is no need for relays and this approach meets with my KISS principle for electronics.
v/r
Strike
__________________
Mike "Strike" Messer, CFI/CFII/MEI, ATP
RV-8A/F-15E/T-38/T-37/T-6
RV-8A Phase II
N-251WM
Garmin G3X/GTN-650/Dynon D6/GTX-23ES/TruTrak GX Pilot/GDL-39
Eagle XTREEM I0-360-B1HD2 (dual P-mags)
Last edited by Strike69 : 01-31-2014 at 07:26 AM.
Reason: Updated diagram
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01-31-2014, 06:41 AM
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Join Date: Jul 2007
Location: Cypress, TX
Posts: 526
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PTT Only
Rear seat only needs push to talk. I originally bought Tosten grips for front and rear. I found the forward angle of the rear grip required the stick to be cut very short to avoid interference with front seat back. Changed to a straight Ray Allen for the rear. Make sure your infinity will work in back without hitting front seat.
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01-31-2014, 08:08 AM
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Join Date: Nov 2010
Location: Okanagan Valley BC, Canada
Posts: 483
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I wired back seat grounds through a "locking switch" mounted on the right front seat back support reinforcement. It can be activated from either seat, but I figured it was unlikely that a Young Eagle would think to pull the switch to move it.
I left the PTT active and made the locking switch accessible from the back so that the rear seater could have full control should I become incapacitated. Of course you have to brief rear seaters that you want to have control on the operation of the switch. I did not wire the "start" button to the rear...
If you combine grounds on either stick, remember that the start relay and fuel pump need separate grounds. I made the mistake of combining these and found out later it would not work that way.
I also made my back stick removable, in case I had baggage in the back, or someone I just didn't trust...
The cup holder came out, just not enough room for a water bottle...

__________________
Ron Townson
Okanagan Valley BC, Canada
RV-8 Completed Dec 2013
Membership renewed Sept 8, 2019
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01-31-2014, 08:25 AM
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Join Date: Mar 2009
Location: Grand Rapids, MI
Posts: 1,004
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Call it my Grandkid switch! Like others have said, wire all the grounds to one switch. Works like a charm.
__________________
Paul K
West Michigan
Unfortunately in science, what you believe is irrelevant.
2020 donation made, exempt but worth every dime!
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02-09-2014, 06:43 AM
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Join Date: Jan 2014
Location: Concord, NH
Posts: 1
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why not a switch on power to the rear stick?
I wired all power to the rear seat stick switches that activate relays through a switch. That means only 1 wire on 1 side of the switch. I located the switch on the front side of the bulkhead adjacent to the pilots seat back where it is out of sight from the rear but could be reached by someone in the back. That way if I have briefed the rear seat occupant about it and there is an emergency requiring them to fly, they can reach it, but if its a kid, they aren't likely to see it. Is there reason it's better to switch the grounds than the power side?
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