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Eliacim,
Until you've changed your prop, the engine can't spin
to the power range of 85 hp. You've still effectively got a 75 hp.
If 't were me, I'd have a good prop shop trim
the length and repitch it.
Note that Coupes normally don't climb all that well
unless you keep the gross weight down. We fly a good speed with little
engines - compare to 108-115 for the Cessna 152 which flies about the same
speed - but, the small engine gives not-that-great heck, not very good
climb. I love Coupes but I can’t brag about their climb.
7152 = "cruise" prop. Some
engine/airframe/gross weight combinations can keep the plane from achieving the
desired cruise speed - it bogs down. You, flying at 1260 lb. max gross
weight (you are, aren't you?) might cruise well with this pitch. Climb is
even more anemic than normal for Coupes. Cruise speed at 2400 rpm might
be 112 mph, as long as you don’t bog down.
7150 = "normal" prop. Somewhat less cruise
speed, somewhat better climb. Climb may still be an issue. Cruise speed
at 2400 rpm is about 108 mph.
7148 = "climb" prop. Popular. Less
cruise speed but adequate climb. Cruise speed at 2400 rpm is about 104
mph.
7146 = “extreme climb” prop. Just
barely meets A-787 specification of 2225 static rpm. Climb is good enough
to get to 12,500 anytime you want – but it takes about an hour to get up
there. This is what I had and I was willing to give up some cruise speed
for the short-field comfort and to climb above the bump-layer on thermally
days. (I still flew it coast to coast.) Cruise speed at 2400 rpm is
100 mph.
Other things affect cruise speed including gross
weight and parasitic drag such as venturis, landing gear fairings, gear mounted
landing lights, etc.
Choose your number, find a good prop shop and send it
off.
http://edburkhead.com
ed -at-
edburkhead???.com (change
-at- to @ and remove "???")
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