REFLECTOR: Mag timing

[Ron Brown]

Brian,
Almost.  Turn it backwards past 28 degrees BTDC, then go forward again.  All 
of this AFTER the impulse coupler has snapped.  You're almost right, except 
you need to take the slack out of the system while turning forward.


----- Original Message ----- 
From: "Brian Michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, October 29, 2005 6:23 PM
Subject: REFLECTOR: Mag timing


> Okay, I'm timing my mag that has an impulse coupling.
>
> I don't have a buzz box, but I do have a cheap $20 handheld function 
> generator, and a not so cheap voltmeter.
>
> I connected the function generator to the P-lead and ground, and my 
> voltmeter to the same place.
>
> I set the voltmeter to read AC volts and get about 300 mV when the 
> contacts are open.
>
> I want to time my mag for 28* BTDC.  If I spin the motor around, the 
> impulse coupler releases a couple degrees ATDC, and then I see my 300mV on 
> the meter.  This is NOT what I want to time to, right?  So what I do is 
> turn past where the impulse fires, then go backwards.  Only when I go 
> backwards to 28* BTDC do I see the expected behavior where I can see the 
> points open and close with the voltmeter.
>
> Have I got this right?
> _______________________________________________
> To change your email address, visit 
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html