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<< Lancair Builders' Mail List >>
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Ian,
Your calculations are not wrong (Q#1). The choice of any system requires the balancing of compromises to finally satisfy your confidence level, overall costs, installation and operational simplicity, etc.
I have two friends that use pure dual electronic ignitions and I can relate some of their experiences -- none of which were particularly "puckering" (Q#2). Neither has a backup battery or alternator. One uses auto plugs which appear to work well. One uses the mag locations to drive crankshaft position sensors and fires all top plugs from one "side" and the bottom plugs from the other side (making cylinder related problem diagnosis very easy). The other uses a Hall effect crank sensor. Both type of position sensors have had minor problems. Both have had ignition wire problems. One is considering adding the backup-battery system and the other is considering adding the B&C secondary alternator.
The Unison Lasar system (http://www.unisonindustries.com/products/ignition.html) (Q#3) has satisfied all of my requirements:
1. Results that warrant cost: Quick starts (hot or cold), increased power (noted by sprightly takeoff run, energetic climbs, improved cruise) and improved fuel usage.
2. Backup/Confidence: Simply reverts to familiar magneto operation if there is any failure in the electronic system, including loss of electrical power. Mags are checked before flight in the usual fashion. A panel light indicates backup magnetos are operating.
3. Installation simplicity: Replace mags (kept original harness and plugs), mount controller box, wire panel light and power, connect to manifold pressure, time mags, start engine and go (after making log book entry).
Scott Krueger
N92EX
LML website: http://members.olsusa.com/mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please remember that purchases from the Builders' Bookstore
assist with the management of the LML.
Please send your photos and drawings to marvkaye@olsusa.com.
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