REFLECTOR: Exhaust systems

[reflector@tvbf.org]

I don't have any pictures but I can assure you it's NOT urban legend.

The place we saw it bad was with a 540 engine and exhaust that's routed 
inboard, closer to the flywheel.  It happened on 2 blade props, I believe 
it would be just as likely on 3 blades.  Charles Bracken's Lightspeed 2 
blade prop had seriously cracked, blistered and peeling paint and first 
layer of composite cloth.  Having electronic ignition greatly reduced the 
incidence of charring, leaving a stain but no real damage.  A longer prop 
extension also seems to help.  Misha Kasyan, flying a Catto 3 blade and 2 
electronic ignitions, also has the very tips of his pipes turned to blow 
outboard into the slipstream and shows no damage to his prop at all, but 
that does cost some speed, probably 2 knots or so.


At 04:50 AM 7/9/03 -0700, you wrote:
>All of this talk about cooking props yet I have not seen
>any pictures of a charred or burning prop.  This sounds a
>lot like an urban legend.  Does anyone have some pictures?
>
>Jim
>--- richard@riley.net wrote:
> > Take a look at the ones he does for the parallel valve
> > 540 Berkut, it
> > sounds like they are very similar.
> >
> > I'm very happy with mine, but you MUST use an electronic
> > ignition or you'll
> > cook the prop.
> >
> > At 08:10 PM 7/8/03 -0700, you wrote:
> > >Pat,
> > >I'm in serious discussion with Clinton Anderson at
> > Custom Aircraft Parts
> > >about a couple of "Y" manifolds for my XL with a
> > parallel-valve IO-540.
> > >Very similar to yours, except I'm thinking of having the
> > 2.5" tailpipes bent
> > >45 degrees towards the prop.  I assume that you're still
> > happy with yours?
> > >Keith Hallsten
> >
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>
>=====
>James F. Agnew
>Jim_Agnew_2@Yahoo.Com
>Tampa, FL
>Velocity 173 Elite Aircraft Completed
>_______________________________________________
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>Visit the gallery!  tvbf:jamaicangoose