- Brace yourself!!! 2-cycle pipes and coupler material

[Brian Young]

That hiccup at throttle up from inverted on the Webra
is a mixture thing. I was getting that for awhile and
managed to get it to go away without changing from my
bolly590. From inverted stuff the engine would
hesitate, and sometimes pop, and sometimes blow a very
cool smoke ring, and then takeoff right? (Had a Bully
that would do the same thing if mixture was "right")

My friend has the greve pipe and it is good his Webra
will turn a bigger prop using the greve. 

I also found a source for alternate 2 cycle pipe
coupler which is a silicone heater hose with a fabric
brade. It lasts longer than aerotrend. The MFR is
Pur-o-sil, Bolly uses this material, I found the
manufacture and got a foot and a half sample for
"Business Reasons". Anyway, some auto race shops carry
similar stuff.


--- Woodward James R Civ 416 FLTS/TPS
<James.Woodward2 at edwards.af.mil> wrote:
> Hey Folks
> 
>  - Brace yourself!  Those of you that think the most
> expensive option for
> equipment is best, you may want to sit down.  This
> weekend I flew my Phase
> One with Webra 1.45 R and replaced my very expensive
> ES 2 cycle pipe with
> 0.9" inlet, with the less expensive Greve pipe.  On
> the ground, the engine
> seemed to run up a little better.  This engine has
> about 300 flights on it.
> In the air, it was acting like a new engine
> again!!!!!!!!!!  This was a VERY
> pleasent surprise, as the power was
> 'not-what-it-used-to-be'
> (understandably).  Still using the 17 x 12 APC
> (regular blade).
> Additionally, the "hickup" that was present when
> throttleing from inverted
> that was a pain with the ES setup, is now gone.  For
> instance, when pushing
> around the bottom of the cuban 8 with 2/4, thottle
> is smooth without
> hessitation.  Same with exit of the triangle loop,
> and exit of the 3 turn
> spin. - very happy customer.  This was the same pipe
> I tried first on my
> Advantage.  That setup, I used the "full-length"
> MACs header, 1/4 - 3/8"
> gap, and the "full-length pipe".  That was about
> 1.5-2.0" longer than the
> 27.5" setup length on Piedmonts website.  Setup ran
> perfectly.  On the Phase
> One setup, I used the 27.5" setting by cutting down
> the header, with equally
> good performance.  I will attribute any extra
> performance on the Advantage
> due to it's using the new Webra AAR.  The design of
> the pipe does not lend
> to cutting anything from the pipe (... wouldn't
> recommend that approach).
> The whole setup fit with some room to spare in the
> Phase One.  
> 
>  I'm getting away from a kick of reading rpm of
> reading on the ground (after
> some reading about pipe theory).  Readings show that
> max "air" performance
> is gained by getting the pipes peak performance on
> the ground, and
> lengthening the setup to about 300 rpms less.  Then,
> it unloads in the air
> and has more sustained power in the uplines.  
> 
> Header coupler material:  Tired of having your
> Aerotrend replacement
> silicone tubing crack and break too quickly? 
> www.mcmaster.com has
> "silicone" replacement tubing.  I ordered some off
> of Bob P.'s
> recommendation.  I ordered 2' each of
> "clear-medical" silicone, and "red"
> silicone tubing.  The material seems very good. 
> Total cost including
> shipping was $18.00.  The red feels lighter.  Both
> seem durable and plyable
> - similiar to the material that Macs headers come
> with.
> 
> Jim W.
> =====================================
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> 


=====
Brian Young
Tulsa
b4598070 at yahoo.com
918-745-6046h
918-838-0900w

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