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Old 11-04-2013, 09:00 AM
John Courte John Courte is offline
Join Date: Jul 2005
Location: Los Angeles, CA
Posts: 634
Default Magneto Mistake, part deux - An expensive lesson

A few days ago, I posted in this thread with a question about what happens when you leave the timing pin (makeshift or otherwise) in the back of a Slick magneto and pull the prop through a couple of times.

This is the answer:

It's a little more involved than that, and you can read the full comedy of errors on my build blog, but the bottom line is that this is an expensive lesson fortunately taught in ground school rather than during air work.

I'm now receiving a little over $300 worth of stuff from ACS because I made a mistake.

Due to other factors, I was also troubleshooting the wrong mag for nigh on three weeks, and so far these are my takeaways:

1: Pay attention to and follow procedures. Had I done so, this thread wouldn't exist.

2: Label connections. For whatever reason, I didn't label the L and R p-lead wires as such and have wasted valuable time because of it.

3: Assumptions can be wrong. If you get unexpected results based on an an assumption, throw out the assumption and check things upstream of it.

4: Don't discount the simple or the obvious. There is no magical mystery juice flowing through these engines that suddenly runs dry from time to time. The answer is there, you just haven't seen it yet.

I hope my adventures can help keep someone else from stepping in the same mud puddle that I did. On the plus side, assuming there is one to this debacle, the engine now runs smooth and strong, and returns some of the confidence I've lost over the last couple of weeks.
RV-7 N313TD
SOLD 7/2/2020
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Old 11-04-2013, 09:07 AM
Mark Dickens's Avatar
Mark Dickens Mark Dickens is offline
Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,475

I got over making expensive mistakes a long time ago. If you're going to build a plane in your garage, and you are learning as you're building, you will make these mistakes. The trick is to find the mistakes before you get into the air. Yes, it's expensive, but you shrug it off and keep on keeping on!

Thanks for the post. Maybe, I'll avoid the same mistake...but only maybe!
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
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Old 11-05-2013, 07:57 AM
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woodmanrog woodmanrog is offline
Join Date: May 2005
Location: Florida
Posts: 781

A wise man learns from the mistakes of others. Before tackling anything new, get in the habit of reading the forums for information based on experience. AND, send your dues to Doug ASAP!
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Old 11-05-2013, 09:28 AM
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jjconstant jjconstant is offline
Join Date: Dec 2006
Location: Oakland CA
Posts: 771

I LOVE numbers 3 and 4

Words to live by in this hobby!
All Best

Jeremy Constant
RV7A "Stella Luna" ECI IO-360 WW200RV Pmags 360hrs
VAF 2019 paid plus some for those who can't
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Old 11-05-2013, 08:27 PM
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PeteP PeteP is offline
Join Date: Jun 2011
Location: Chesapeake, VA
Posts: 219
Default Mistakes

After many airplanes and to many years of building I have determined that is no such thing as a cheap mistake in this game! But you still need to learn from others no matter what.
Pete (AKA Yoda)
Exempt but VAF 2017 Dues Paid anyway
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Old 11-06-2013, 06:03 AM
rzbill's Avatar
rzbill rzbill is offline
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,755

And my favorite...

Good judgement comes from experience. Experience comes from bad judgement.

When asked during the build "Do you know what you are doing?", my normal reply was "I will when I am finished."
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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Old 11-06-2013, 09:06 AM
az_gila's Avatar
az_gila az_gila is offline
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011

2: Label connections. For whatever reason, I didn't label the L and R p-lead wires as such and have wasted valuable time because of it.

Something as simple as short lengths of red and green heatshrink could do this. No need for a label maker.
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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