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  #11  
Old 07-21-2015, 08:54 PM
F1Boss's Avatar
F1Boss F1Boss is online now
 
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Location: Taylor Texas
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Default sstarter push button

I use a marine quality push button - no problems with the electrics that way. Also, the thing is fairly hard to push, so accidental activation of the starter is minimized. Toggles that work great can be found at the Aviation Aisle at Homey Depot - get those rated for higher amperage. You don't need the amps, but you do need the quality.

Carry on!
Mark
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  #12  
Old 07-22-2015, 04:57 AM
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Quote:
Originally Posted by pvalovich View Post
Starter Push-Button Switch


Price: $17.00

Item Number: S895-1

I used this and two ignition toogle switches.
The same here. Pushing and toggling for two thousand hours
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  #13  
Old 07-22-2015, 09:14 AM
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Toobuilder Toobuilder is offline
 
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Quote:
Originally Posted by Canadian_JOY View Post
...I considered using the locking switches and in fact purchased them. Then I got thinking about the "what if's" and realized there was a down-side to the locking switches. The down-side is that we can't turn the engine off quickly when using them...

...That's why I opted to go with guarded switches rather than locking switches since the guarded switches can be turned off in one downward motion with two fingers.

Again, just throwing this idea out for consideration. We all have our preferences.
There are several different configurations of the “pull and flip” locking toggle switches. I have some laying around that require the 2 separate actions in one direction only – i.e. pull and flip to “ON”, but only a single flip action to return to “OFF”. I’m not a big fan of having an ignition switch that can “easily” be moved to “OFF”, but it might work for some.

Another concept is the use of one toggle switch to turn the ignition “ON” “OFF” and (momentary) “START”, and another toggle (3 position) which controls the mode – i.e. “LEFT” “BOTH” “RIGHT”. In this case, one switch can kill both ignitions if needed.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

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Last edited by Toobuilder : 07-22-2015 at 09:58 AM.
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  #14  
Old 07-22-2015, 09:43 AM
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One advantage of the toggle switches is that one can be easily rigged to act as an ON/OFF for a single side Electronic Ignition.

No relays involved, which would usually be the case with a rotary switch.
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  #15  
Old 07-22-2015, 10:48 AM
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I use two DPDT toggle switches (three positions) located ahead of my throttle quadrant on a self produced angled mounting plate.

The switches are wired to provide an interlock for the starter switch located on my Infinity stick grip. Below you see the left and right switch positions - top,middle, and bottom.

Left Mag. Right Mag
ON (Start). ON
GND. GND
GND. GND (Start)

You can engage the starter in two ways:

Left = top, and right = bottom (left impulse mag on, right mag grounded- this is the normal start position.
Left = middle, right = bottom. Starter can engage but both mags are grounded - this is a maintenance mode)
In any other position the starter is locked out. For instance, after a normal start the right mag switch is flipped to ON and the starter circuit is bypassed.

Don
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  #16  
Old 07-22-2015, 11:48 AM
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Default Thanks!

Thanks guys, this is all great info and exactly what I was looking for. I like the flip up guard push button and the mil spec mag switches. blueflyer I am a little confused why you have to turn off the right mag for a re-start. With my understanding, if you had to restart the motor in flight, you would want both the mags on correct?

Thanks all!

Wingnut
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  #17  
Old 07-22-2015, 12:54 PM
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Generally, only the left magneto has an impulse coupling which delays the spark plug firing until top dead center. A keyed ignition switch automatically disables the right magneto when turned to the start position. Leaving both on when starting would cause the right mag to fire it's plug well before TDC and would prevent the engine from starting.
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  #18  
Old 07-22-2015, 01:53 PM
Canadian_JOY Canadian_JOY is offline
 
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Wingnut - for in-flight starts, the question of whether or not the right mag is turned on is based on whether or not the prop is windmilling.

If windmilling, the prop is turning far faster than the starter would crank the engine, so the impulse coupling would not be active. Keep the right mag on in this instance.

If the prop is stopped, logic would dictate that using the left mag would be the best option when engaging the starter.

Frankly, if the prop stopped for reasons other than a maneuver which resulted in a drastic airspeed reduction, then you're not likely going to be worrying about which magneto to use! LoL
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  #19  
Old 07-22-2015, 02:04 PM
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Quote:
Originally Posted by WingnutWick View Post
I am a little confused why you have to turn off the right mag for a re-start. With my understanding, if you had to restart the motor in flight, you would want both the mags on correct?

Thanks all!

Wingnut
During start, the mag with the impulse coupler (typically left) should be the only one active. Otherwise, the right mag, firing 25 or so degrees BTC could cause the engine to kick back against the starter and possibly cause damage.

That said, if you are going with P-Mags instead of standard magnetos, it is a non-issue. P-Mags deal with starting automatically (from what I've been told).
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Last edited by Raymo : 07-22-2015 at 02:07 PM.
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  #20  
Old 07-24-2015, 09:07 AM
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JohnInReno JohnInReno is offline
 
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Default Keyed switch

I used a marine keyed switch for the starter instead of the push button and toggle switches for the mags. I like having a key.
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