Begin forwarded message:
> From: Fred Klein <fklein@orcasonline.com>
> Date: July 19, 2010 9:28:12 AM PDT
> To: John Wigney <johnwigney@windstream.net>
> Subject: Re: Europa: propeller shaft alignment w/ cowl
>
>
> On Jul 19, 2010, at 7:49 AM, John Wigney wrote:
>
>> 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.
>
> 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 @ the prop.). Hmmmmmm...
>
> If you recall, was your "fix" in the nature of increasing or
> decreasing the offset called for in the manual?
>
> Fred
>
>
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