Push Button Start and Mag Toggle Switches

[DaveO]

I used two SPST switches for the Mags. I used a switch for start on an Infinity control stick. I used a Master Switch to control the use of the starter and so no accidental start.
Worked for me.

[Mel]

I originally had my switches set up so that the starter was disabled when the right mag is on.
Later I got a deal on a new impulse mag and installed it on the right. Now start on both mags. Problem solved.

[n82rb]

to each their own, but i dont see the need to complicate two switches and a push button.

bob burns
RV-4 N82RB

[Electrogunner]

I wiring my push button start though a relay that grounds the right mag anytime the starter solenoid is powered. Basically the same thing a 3 position keyed switch would do. I like to keep things simple.

[BobTurner]

Summary: There are lots of ways to do this. Do you want to be able to spin the starter, mags off, for maintenance? Do you want the starter switch locked out when flying? Your choice.

[lr172]

Originally Posted by BobTurner

Summary: There are lots of ways to do this. Do you want to be able to spin the starter, mags off, for maintenance? Do you want the starter switch locked out when flying? Your choice.

+1

I went back to SPST switches so that I had more options in an emergency. If you can't remember to keep the right mag off during start, you have other issues to address. I can think of many things that will harm you in aviation if you don't remember them. This is why we have checklists. You don't have a switch or relay to insure you have gas in the tank before takeoff, right.

Larry

[Paddy]

It looks like you have a double pole starter button there. You could easily use one pole to engage the starter and the other to ground the left mag (even when it's "on"). That way, all you have to do is flip both mags on for start, hit the button to engage the starter (which also grounds left mag). When the engine fires, release the button and both mags are live, just like a key switch.

[RV7A Flyer]

I have two toggles for mags, and a pushbutton starter (plus keyed master). L mag is impulse coupled, right is not.

I have a schematic I can send you that shows how I wired it so that

a) no matter what the mag toggle switch positions are, if the master (keyed) is not on, the starter will not engage (starter pushbutton is disabled) and
b) when the start button is pushed, the right mag is grounded

I think this is what you're after. I'll dig it out and send it later tonight.

Oh, and once started, failure of the keyed master will not cause the engine to stop. I did a whole fault tree on this circuit to ensure safety (both personnel on the ground and safety of flight).

[Paddy]

Here's a schematic showing one way to wire individual mag toggle switches with a push button starter (DPST) and a key switch for just the starter circuit. Working great for over 350hrs and 2 Atlantic crossings

[Sue]

Merely my opinion, I would have the toggle switches
With guards over them in the down position. Engine
?On? guards up engine ?off?. Right mag up, it?s off.
If backwards.... Flying along and and soda falls off,
you almost catch
It... oops as you reach for it you knock the switches
Down, oops throw them back up and boom, backfire!!
Hope you didn?t just blow your intake hoses off.
Same goes for a nice roll or slow loop, you fell through
And your iPad falls off and makes contact. Turbulence
Etc. only down side is canopy open and someone pushes
Down mags ?hot??