I've been collecting some engine data on my
Renesis 4 port powered RV-7A with a Catto 76X88 2 blade prop. I use
Mogas with 0.6 oz Wal-Mart 2 stroke and Marvel Mystery oil mixed 50%
each. Static is 5550 rpm. In climb at full power I get 5700 rpm at
about 85 knots. Level at 2000 ft msl and 155 mph I turn 5200 rpm
on the engine @ 20mpg. At 170 mph I turn 5800 rpm. At 185 mph I turn
6200 rpm. I have the B gearbox 2.85:1 engine to prop ratio.
I now have over 500 flying hours. I use Mobil
1 - 15W 50 synthetic oil and change it every 50 hours.
My flying for the last year and a half includes 2
to 3 very short flights each week to play tennis (7.5 minutes each
way). I warm the engine to at least 110 deg F. before going
to 3200 rpm for engine checks. I takeoff full
throttle when the oil and water are over 120 deg. F.
I hope this is helpful.
Dennis Haverlah
PS: Charlie and Tupper England -Shirley and I are excited you
and Tupper are making plans for another fly-in! The last one was great -
let us know how we can help!
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