Thanks Fred
As usual, you reply quickly with the cogent info. My motor mount has about a
0.4 degree port offset so I will need to shim the port motor mounts. The
vertical mounts are pretty square.
Thanks again.
Tom
Fred Fillinger wrote:
> Hi, Tom --
>
> > I have a fwf kit for a Jabiru 3300 for the XS and thus far I have little
> > installation info. Does the Rotax kit 4 discuss the engine thrust
> > line? Many aircraft call for a 2 to 3 degree thrust line offset to
> > starboard to compensate for P factor. What is called for with the Rotax
> > engines?
>
> 914 manual says 1.5 deg. to starboard. Determined by a straightedge
> on prop flange, with tick marks 20" on either side of centerline
> (total 40"). Distance from marks to firewall should differ by
> 1-1/16".
>
> > Is there any vertical line offset?
>
> They don't say, but mine came out about zero. It depends upon
> relationship of your thrust centerline with the vertical position of
> the aircraft's CG, probably still (desirably) above the latter for the
> 3300, unlike a high-wing Cessna where engine's gotta point down. I'd
> guess as long it's zero or down a hair, you'll not notice anything in
> flight testing (you don't want immediate pitch up on rapid power
> application - horiz tail alone causes a bit of that). Looks about
> zero on Bob Harrison's, eh Bob?
>
> Enjoy that 3300.
>
> Regards,
> Fred F., A063
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