There have been a lot of other interesting ideas my post generated:

1 - switch to one mag
2 - carb heat
3 - pulse mags on/off (but if prop stops windmilling you'll need to
restart, not good)
4 - mixture (which is what we did)

Any engine experts have a recommendation on which approach would be best?
Or a combination?

Event Horizon

a wrote in news:a0945182-fc81-4f28-81f3-
:


I remember watching WW1 airplanes flying at Old Rhinbeck (sp?) airport
in NY. Those had two engine settings -- full on or off, and power was
controlled by what an electical engineer might call pulse width
modulation -- switch the mags on and off as needed. I have no idea how
that would work in today's engines, but my instinct would have been to
reach for mags, not mixture. Your way worked, I'll remember that.