Subject: M&W CD ignition
From: paul lamar
Date: 8/9/2017, 1:55 AM
To: A10-Me-Earthlink

If you are using the Oz M&W capacitor discharge ignition for the rotary
make sure your voltage regulator is set for at least 13.5 volts.

I suspect we found this out on the TTC the hard way because we do not have an
alternator or voltage regulator. Consequently the battery voltage can
fall well below 12 volts at high RPM and that probably causes the M&W to mis fire.
The higher the RPM the higher the current drain with CD systems.
No voltage regulator causes the voltage to drop off.

When we were running it on the ground at full power we had the battery charger
connected and no problem. When Dan flew it at full power it started missing.
The vapor out of the blow off valve indicates full power on the ground run video.

Here is the M&W installation instructions. They recommend 16 or 18 volts.

We can use 3 of these Uausa batteries wired in series to generate 18 Volts.

https://www.summitracing.com/parts/ysa-6n4-2a-4?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-yuasa-batteries&gclid=EAIaIQobChMIqZyS4drJ1QIVAZN-Ch3lxgxSEAQYASABEgLkh_D_BwE


The weight is 1.9 pounds for each battery and the dimensions are
each bat  is 3.5 inches long 2.75 inches wide and 4 inches high.

The new battery box will be 8.25 inches wide and 3.5 inches deep.

I will build it.

Thanks to Nills Castillo for the advise.

All else fails read the instructions :-)

Paul Lamar


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