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dlorrzen701(at)earthlink.
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 Posted: Tue Dec 23, 2008 4:54 pm Post subject: CH701, C-85 Prop Size |
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Is anyone flying a Zenith 701 with a C-85 or 0-200? If so what prop are you using (Dia,Pitch, Mfg. etc).I was looking at the Warp Drive High HP Props but I'm a little concerned about the Hub cracks reported on the web.
Any suggustions would be helpful.
Thanks
David L. Orr
Port Angeles, WA
EAA 430
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Fri Dec 26, 2008 5:00 am Post subject: Re: CH701, C-85 Prop Size |
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This will give you a general idea.
http://www.culverprops.com/pitchselection.htm
As for the O-200 it is pretty much comparable to the Corvair and here is what Mr. Whynne said about the Corvair and slow air plane props. Remember it was for a Corvair and is a general statement.
"We recently thrust tested a 72" Warp Drive on a Corvair without a cowling, and with a cast iron exhaust and big muffler in place. It pulled 385 pounds of thrust at 2700rpm at a pitch which would yield a cruise speed of 85 or 90mph, with a redline of 105 or 110. With a cowl and a flight exhaust, it would be 425 pounds or so. This combo would produce good average thrust over a wide range of airspeeds. "
You can back calculate the pitch at the above link. Not perfect but its at least from people who knows props and direct drive engines.
PS the quote is a few years old and the rest of the article did not really support the use of long props in general. Here is the title you can search for it on his website.
Subj: Corvair in STOL aircraft Date: 7/15/03
Kevin
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