dlorrzen701(at)earthlink.
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 Posted: Mon Mar 18, 2013 6:04 am Post subject: Zenith701801-List Digest: 0 Msgs - 03/17/13 |
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The below information is from Tony Riley, him and his dad had a 701 with a A65. I went with a C-85-12 on my 701 still in the build stage.
Good Luck
David L. Orr
Information from Tony:
My Dad personally recomends that a person unless they've already purchased their powerplant, should buy an 85HP Continental... However, for the most part, our 701 flies nicely on the 65... The key is to get as much RPM therefore potential HP out of the powerplant... Our current homemade prop is a 60" diameter, so with the extended nose gear and short prop, there is decent ground Clearance... As mentioned the face/width is fairly wide, so decent pull... On takeoff at full power we are getting 2800RPM out of our 65 powerplant... My dad, who made the prop, is not sure the pitch of course... but here is a reference point... He has over 10,000 hours flying time, between commercial bush flying and private aircraft, including aerobatics back in the day.... He was a private instructor for several years, he has been a Licensed AMO- Aircraft Maintenance including Structural repair for over 20 years... He currently still instructs on our 701 as an ultralight instructor, and does tailwheel checkouts on his scratch built Clipped Wing Acro Cuby...
He said on a 65HP powerplant, you should typically run a 43-44 Pitch
and on an 85HP powerplant, run a 44-46 pitch prop... The previous wood prop that we first had on our 701 in the beginning was about 68-70 diameter wood prop with a 43 pitch... With that prop, we were getting full power 2500RPM out of the 65... Near the end of the lifespan of that prop, we had to chop the tips, which brought us down to a 62" prop...
Our original specs were:
Light one passenger, colder temps
800 FPM
Gross 1100lbs max
Hot Day
325-330 FPM
Cruise Avg. 70mph, bearing in mind that we have an open cowl and no aerodynamic fairings on the wing struts which make a difference
Our friend with fairings on the struts, an enclosed cowl, with a 100hp 912 Rotax, and he does run the Leading edge STOL Slots, gets a Cruise AVG. of 84MPH
I would guess that on an average summer day, with 1.5 to 2 hours of fuel on board, and my Dad 170lbs and myself 220lbs, that we would get 500fpm estimate...
Well I hope that some of this information is helpful,
Tony
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