National Aeronca Association Bulletin Board

Hello all, I've got a 7ec with 90 and I'm puting it on edo 1400 floats. The problem is i dont know which prop to get a Sensenich 76ak-2-42 or 76ak-2-40? Does any one have any opinions on this or have one these prop's are your plane. I would sure like to hear what kind of rpm you are getting. thanks

Albert:

I have that prop in a 42 pitch. I purchased it as a 44 but had two inches taken out after a few months.

On floats, I think the 40 pitch would be very nice. I've considered taking another two inches off, even on wheels. I rarely make long trips and really like short-field work. I think the 90hp Cub uses this prop with a 38 pitch.

My 7EC went from 2250 rpm wide-open throttle in cruise to redline at WOT. The throttle can come back nearly halfway to stay under 2300rpm.

The Champ goes faster with a 42 than it did with a 44!

edit to add: Static RPM is around 2250, with ~2300 climb rpm at 60 mph.

Jon B.

I'd go with a 40 pitch if you're on floats.

What would be a good "climb" pitch, 44? or Lower. On wheels. C-90

Tom

Tom,
My buddy recently sold his CCM that had a C-90 and the plane was on floats. I will see what his prop pitch was and get back to you. He posts on the SC site so he may answer your question there also.
Keith

Talked to him....he said his prop was a 73/42.