REFLECTOR: Exhaust systems

[Scott Derrick]

Mike,

How far from your exhaust exit and the prop.  Also how wide(far apart) 
are the stacks?  I would think keeping both theses distances at a 
maximum would minimize the heat problem.

Scott


Mike Pollock wrote:
> The best way not to cook your prop is to get it further away from the
> exhaust.  This can be done with a longer extension or changing where the
> exhaust is dumped out.  We chose the longer 8" extension and we have never
> burned a prop.  We do have a little soot, but no burns in 620 hours with an
> IO-360 with 3-blade Performance propeller.
> 
> I guess some are lucky and some are not.
> 
> Mike
> 
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Ronnie Brown
> Sent: Wednesday, July 09, 2003 7:12 PM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR: Exhaust systems
> 
> 
> Not only true with the M/T but also any three bladed prop.  No way to clock
> it such that it misses the exhaust, even for 4 cylinder IO 360's.  No
> pictures but I saw with my two beady little eyes a Velocity and a Cozy, both
> with 360's, both with Performance props, both had charred spots on one blade
> of the prop, looked like a wooden match that had burned, then extinguished.
> Not pretty.  The Velocity prop was returned to Clark, he pronounced it dead
> and unusable.  A two blade can be turned such that it misses, but as someone
> mentioned, there are only two positions that a three blade can be installed,
> both incur the wrath of the 1400 degree exhaust.
> 
> I have a three blade Catto and forward exit exhausts.  No soot on the prop
> but some on the cowl.
> 
> Ronnie Brown
> 173 Elite RG 55 hours
> 
> 
> ----- Original Message -----
> From: "Tom Martino" <tmartino@troubleshooter.com>
> To: <reflector@tvbf.org>
> Sent: Wednesday, July 09, 2003 4:01 PM
> Subject: RE: REFLECTOR: Exhaust systems
> 
> 
> | So is the conclusion truly that we cannot have a dual rear exiting exhaust
> system with an MT prop because it will damage the blades?  That is a major
> disappointment.
> |
> | -----Original Message-----
> | From: Pat Shea [mailto:xl340hp@yahoo.com]
> | Sent: Wed 7/9/2003 1:45 PM
> | To: reflector@tvbf.org
> | Cc:
> | Subject: Re: REFLECTOR: Exhaust systems
> |
> |
> |
> | --- Jim Agnew <jim_agnew_2@yahoo.com> 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
> |
> | No pics but...
> |
> | Rodney Brim and the late Steve Drybread made a
> | serious attempt at a rear exiting exhaust for Rodney's
> | XL (IO-540 w/ 3 blade MT and I think one EI). They
> | tried many different configurations (pipes exiting out
> | the existing cowl openings, pipes exiting back thru
> | lower & outboard openings, pipe tips turned out...)
> | but were unable to prevent the exhaust from damaging
> | the blades. Steve did have success getting a similar
> | engine/exhaust combination to work on the Berkut, but
> | since they run a 2 blade fixed pitch prop there are
> | multiple clocking positions. There are only two
> | positions for clocking the MT on this motor.
> | Also, Scott Swing briefly tried a Berkut style rear
> | exiting exhaust on the XL prototype (IO-540 w/ 3 blade
> | MT) and blistered the prop.
> |
> | Pat
> |
> |
> |
> |
> |
> |
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> 
> 
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