Electronic ignition, engine and propeller compatability

[tgmillso]

Hi All,
I recently ordered a set of E-Mag Series 114 P-Mags for my IO-360M1B and Hartzel 72" blended airfoil propeller (C2YR-1BFP/F74972) combination (one of the standard orders available from Van's for the RV-7). Before I got around to installing the P-mags I realized that I hadn't considered the torsional vibration/blade vibration impacts of running electronic ignition on this combination of engine and propeller. I have contacted E-Mag and they have no specific instances of this combination and are not really aware as to how one would test the setup to ensure it is an acceptable combination. I did a bit of digging on the internet and found an list of approved aircraft types for the Electroair EIS-41000 ignition, which included a huge array of aircraft that have aluminium propellers (which gave me a little more confidence that my combination will work).
http://www.aircraftspruce.com/catalo...l-08-05953.pdf

Brad from E-Mag also forwarded some documents released by Hartzell/Vans that gives a restricted operating range for engines equipped with Lightspeed ignition:
https://www.vansaircraft.com/pdf/Hartzell_c2yk.pdf

And more specifically for the "Blended Airfoil" propeller:
https://www.vansaircraft.com/pdf/Hartzell_c2yr.pdf

Thus, the questions I have are as follows:
1. Does anyone have operational experience running the P-mags (or any other electronic ignition) with this IO-360M1B and Hartzel 72" BA propeller combination (or 74" for that matter)?
2. Is anyone aware and prepared to share the methodology that one must follow to perform a vibration analysis for ensuring acceptable compatibility of this hardware combination?
Regards,
Tom.

[Bevan]

See this thread for a recent similar discussion which includes contact info for Les at Hartzell who is very responsive via email for these types of questions.

http://www.vansairforce.com/communit...light=hartzell

I'm running a similar (not exact) combination.

Bevan

[rzbill]

Follow the link from Bevan and find prop limits 2 in my post and look for the post from Les Doud . The M1B is approved with your prop and a lightspeed so it is up to you to decide whether the lightspeed and your EI are similar.

[tgmillso]

Excellent. Thanks guys for the pointers. This is good to know.
Sounds like we are in the clear.
For others reading this post, here's the link to the Hartzell application document. This particular combination may be found on page 1402.

http://hartzellprop.com/wp-content/u...000-R56-WA.pdf

Tom.

[DanH]

Originally Posted by rzbill

Follow the link from Bevan and find prop limits 2 in my post and look for the post from Les Doud . The M1B is approved with your prop and a lightspeed so it is up to you to decide whether the lightspeed and your EI are similar.

Which should be a question of timing, not necessarily the fact that it's electronic.

Another good reason to make ignition maps public, BTW.