My exhaust pipe (Rotax standard, not Factory standard) pointed straight down
and protruded about 12". I cut it down to 6".
Speed gain was a big fat zero.
Duncan McF.
----- Original Message -----
From: "Fred Fillinger" <n3eu@comcast.net>
Subject: Re: Europa-List: FW: New 914 Exhuast muffler and tailpipe
>
> Kevin Klinefelter wrote:
> > It looks like the new muffler (silencer) makes the
> > bulge in the cowling no longer necessary? I was thinking cutting it
> off and
> > re-glassing the area smooth and symmetrical with the other
> side...Probably a
> > lot work for a tiny reduction in drag?
> >
> > Also the new tailpipe is longer. I have noticed on the XS (pictures)
> that
> > the pipe is pointing pretty much down instead of back. A less draggy
> look
> > would be aimed back with the flow more. Is there any reason for not
> aiming
> > the pipe a lot more aft?
>
> Answer to both...got a wind tunnel? :-)
>
> It's a real skinny pipe, so ain't talking much. But a round pipe
> angled becomes a messy oval for less drag, as you implied. As I look
> at various production aircraft, seems they either don't care or know
> why they shouldn't care.
>
> Reg,
> Fred F.
>
>
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