fklein(at)orcasonline.com
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 Posted: Mon Jul 19, 2010 10:42 am Post subject: Europa: propeller shaft alignment w/ cowl |
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Begin forwarded message:
| Quote: | From: Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)>
Date: July 19, 2010 9:28:12 AM PDT
To: John Wigney <johnwigney(at)windstream.net (johnwigney(at)windstream.net)>
Subject: Re: Europa: propeller shaft alignment w/ cowl
On Jul 19, 2010, at 7:49 AM, John Wigney wrote:
| Quote: | I built my XS mono with a regular Rotax 912S and followed the manual precisely with regard to alignment of the engine to the fuselage. I also fitted the cowl and spinner with great care. Once flying, I found that I had at least 1/2 a ball or more of skid in straight and level flight. I fixed this by adding one washer to the top and bottom engine mounts on one side.
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Hi John,
Thank you for describing your experiences...good to hear from you!...hope to see you at RR in Sept. !.
What you describe gives me pause...out of modesty, I've adhered to the manual's P factor offset rather than making a guess at increasing it in proportion to the increase in cruise power I'm anticipating. (If I cruise at 4500 rpm, engine will be putting out about 115 hp w/ about 135 ft/lb of torque...w/ my 1.9 PSRU ratio, I believe that translates to 256 ft/lb (at) the prop.). Hmmmmmm...
If you recall, was your "fix" in the nature of increasing or decreasing the offset called for in the manual?
Fred
[img]cid:3B284401-21AA-49F2-9B61-1E46E31AD76D[/img]
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