Aeroslave pipe set-up.

[ronlock at comcast.net]

Some additional data points-
My OS 1.40 is running nicely on the Aeroslave- set 33 1/2 inches from
exhaust port to end of pipe (not end of stinger)
Prop is 15 3/4 in dia, 3 blade, de-pitched to 10 by Dave. 
Fuel is 22% nitro S&W, it runs better than 15%.  OS-F plug.
The Aeroslave is much better than previous pipe, though there is still
a slight mid range richness evident on the ground, it is practically 
un-noticable in the air.  

Hi speed needle is not particularly sensitive- I'm using the "Fine" OS needle.
Low speed needle is on the lean side, rarely needs to be touched.

Later, 
Ron Lockhart


-------------- Original message -------------- 

Lance

I've tried 29.5", 32" and 33" from exhaust to the end of the pipe running the 15x11x4APC on 15%. 33" works well ( very linear throttle responce and minimal spooling on downlines) however the setting is still extreemly critical. I have the to make changes to both the midrange and the high speed needles to run the 15.5x12x4...I could not even get the engine past the midrange on the ground. Flying this prop was out of the question.

The tunnel does not allow me to go any longer. How can I de-sensitise the setting? Two plug head, more nitro ? 

Colin.

Lance Van Nostrand <patterndude at comcast.net> wrote:
Colin,
there's a sweet spot that's about 3/4" long for where the pipe works best. You don't have to nail it perfect, but shorter than this and the midrange will get rich and longer it will lose some power.  If the low end is not at a lean setting, you have the option to reduce the pump pressure in addition to lenghtening the pipe.  Lenthening the pipe is the first option to try, but if you start losing power and still have the problme then you must lower the pump pressure. Since you are hunting for that "magic" 3/4", the trombone method I told you about is a quick and reliable way to find the sweet spot quickly.  Before you discount a pump adjustment, remember you were using a Bolly, which may have different tuning characteristics, or it may not even be a tuned pipe.
--Lance

----- Original Message ----- 
From: colin chariandy 
To: discussion at nsrca.org 
Sent: Wednesday, August 24, 2005 7:16 PM
Subject: Re: Aeroslave pipe set-up.


Thanks. I'll try that set-up.

Colin.

wgalligan <wgalligan at cnbcom.net> wrote:
Colin,

My pipe length is 31" from the center of the glow plug to the end of the pipe (not including the stinger). Mine has about 3" between the header and inlet of the pipe.  A good silicon coupler like blue Aerotrend works good.

Good luck,

Wayne
----- Original Message ----- 
From: colin chariandy 
To: discussion at nsrca.org 
Sent: Tuesday, August 23, 2005 8:26 PM
Subject: Re: Aeroslave pipe set-up.


It sounds like I bought the right pipe. I'll look forward to the info on your pipe length.

Regards
Colin.

Wayne Galligan <wgalligan at goodsonacura.com> wrote:
Coiln,

If the engine is running too rich in the mid range lengthen the pipe.  This pipe needs a little longer setup then Lance originally posted. When I went to the AeroSLave pipe I installed it the same length as my previous pipe and it was slobbery rich in the mid range.  I had to lengthen it about 1 1/2 inches.  If it comes on the pipe real hard then it is way too short.  This pipe when at the right length will be real smooth in transition and not come on the pipe hard but have a smooth constant power on top end.
When it is at the right length then richen the low needle as much as it will stand with out loading up and you downlines will be much, much better.
I will measure mine tonight and give you an exact length.   I run a 17x12 APC and a 15.75x10 3blade by Lockhart and they both are real smooth on the power.

Wayne Galligan
----- Original Message ----- 
From: colin chariandy 
To: discussion at nsrca.org 
Sent: Monday, August 22, 2005 7:39 PM
Subject: Aeroslave pipe set-up.


Help needed...tuned pipe problems!!

I've bought the AeroSlave CF pipe for my OS140RX turning an APC 15x11 4-blade. Aeroslave gave a starting length of 29.5 inches from the engine exhaust port to the end of the pipe. However, the engine runs extremely poorly at this length. In order to transition past the midrange the high end needle has to be very lean resulting in a lean high end. The power comes in with a bang and the engine accelerates in down lines. I think this is too short a pipe length although the header is full length.

Does anyone have any experience running these pipes on OS engines? What's the best starting point?

Colin.
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