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  #21  
Old 10-10-2021, 04:32 PM
wilddog wilddog is offline
 
Join Date: Feb 2008
Location: va.
Posts: 657
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Quote:
Originally Posted by DanH View Post
The start arm switch is hidden. The "starter armed" warning light (a flashing LED) ensures I don't forget to turn it off. The relay means no significant current at tiny grip switch.

Right hand, stick back and start command. Left hand, throttle, mixture, purge valve.

About 1000 hours now.
.
That is the same way I wired mine. Also have the PTT button on the throttle. RV-8.
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  #22  
Old 10-10-2021, 06:26 PM
jakej jakej is offline
 
Join Date: Aug 2005
Location: Adelaide, Australia
Posts: 156
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I see 1 excellent exception to comments so far re starter switch on the stick - ie when using the VPX bus system. Am really surprised no one has mentioned this before as there are a lot of VPX systems installed now. Personally the only reason I see the need for a starter on the stick is with tail draggers - absolutely no need to with nose wheel aircraft.
VPX - when the revs are above 500 rpm the starter circuit is disabled therefore accidentally touching the starter button will not activate the starter
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  #23  
Old 10-11-2021, 10:07 AM
rapid_ascent rapid_ascent is online now
 
Join Date: Mar 2008
Location: Dublin, CA
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I'm curious how much current is required for the starter solenoid. I'm still not committed to having the switch yet either. I do think if you need a panel disable switch and another relay that maybe its not worth having a stick switch.
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  #24  
Old 10-11-2021, 10:15 AM
Norman CYYJ Norman CYYJ is offline
 
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Location: Victoria B.C.
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Yes you will need a relay. Make sure you put a clamping diode across it or you will run the risk of burning out the switch on your stick.
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  #25  
Old 10-11-2021, 12:54 PM
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dpansier dpansier is offline
 
Join Date: Jan 2006
Location: Green Bay, WI (GRB)
Posts: 532
Default Contactor current draw

Quote:
Originally Posted by rapid_ascent View Post
I'm curious how much current is required for the starter solenoid.
The starter contactor draws 3.5 Amps and the Battery contactor 720 milliamps, both measured on my aircraft.
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  #26  
Old 10-11-2021, 01:09 PM
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Carl Froehlich Carl Froehlich is online now
 
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I suspect this 3.5amps in holding current. Surge latch current might be a lot higher.

The standard switch (not top hat) on an Infinity Grip is rated at 6 amps. I would not use that as a a basis to skip using the grip switch to operate a simple, 100ma relay that would then power the starter solenoid.

Pitted switch contacts need be avoided.

Carl
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  #27  
Old 10-11-2021, 01:37 PM
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dpansier dpansier is offline
 
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Location: Green Bay, WI (GRB)
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Yes I agree this is the holding current, I could haul out the O Scope with the current probe and get the peak but it is not worth the hassle. <G>
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  #28  
Old 10-11-2021, 09:27 PM
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skylor skylor is offline
 
Join Date: Aug 2009
Location: Southern California
Posts: 1,015
Default No stick starter switch on the stick here…

I think this is much ado about nothing.

On my -8, it’s really easy to hold the stick back between my legs during engine start. To me, this is much easier and simpler than adding a bunch of extra wires, relays and disable switches to add a starter button to the stick!

Keep it simple!

Skylor

p.s. You’ll thank me if you ever have to troubleshoot an intermittent starter issue…

Last edited by skylor : 10-11-2021 at 09:33 PM.
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  #29  
Old 10-12-2021, 06:29 AM
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Harald Harald is offline
 
Join Date: Dec 2006
Location: Essenrode, Germany
Posts: 18
Default Infinity Stick Grip with engine start button

I have Infinity stick grips with switches for the functions engine start, trim, flaps, AP con/disc, fuel pump and PTT. They works perfect! For safety reasons the engine start button needs to be cleared or activated pressing a separate button switch for 2 or more seconds. This switch is located near the trottle knob and has an integrated led that flashes while the the engine start button on the grip is „hot". The engine start button will remain active until it was released or the clearance/activation switch was pressed for two seconds or more. I implemented this solution using a small programmable relay Eaton easy 500. The flap switch on the grip just uses the G3X airspeed limit protection function and in my configuration it is only activated below 87kts.
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  #30  
Old 10-12-2021, 07:05 AM
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wcalvert wcalvert is offline
 
Join Date: Jan 2019
Location: Anacortes Wa
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Clearly two different camps here. Whatever level of Gee Whiz you choose to build (low or high, for your own good reasons), just be sure you have a way to avoid blowing the starter or ring gear off your motor by inadvertently touching the wrong button.

And keep in mind that without proficiency (training and perfect practice), all the little details of function become a whole 'nother ball O bees when the stuff hits the fan or you can't see due to smoke or injury.

Just sayin' ... be careful out there.

Cheers
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