As long as both mags are firing on the impulse coupling, leaving them both on is fine. The only reason for grounding the right mag for starting is that normally it is NOT impulse coupled and will fire at 25 degrees BTC.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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