Webra 145 with Greve Pipe

Wed Jun 18 07:32:21 AKDT 2003

I'll second that.  Just this weeked for grins I tried an 18x8 wood Simitar
prop.  I had the setup for an APC 17x12N.  The airplane flew totaly
different... it was like driving in low gear but fun.
The difference in props made the engine burble after a downline or when
throttling up.  Sounded like it was going to quit.   I went to an extreme
but it does prove tuning is important in any difference of your setup.

Wayne G.
----- Original Message ----- 
From: "Henderson,Eric" <Eric.Henderson at gartner.com>
To: <discussion at nsrca.org>
Sent: Wednesday, June 18, 2003 10:12 AM
Subject: RE: Webra 145 with Greve Pipe

You will also notice a difference in results when you use different prop
sizes. As a general rule you need to make the set-up longer if you use a
bigger prop. (Assuming that you had it right in the first place.

Bigger can mean diameter or pitch. Some sizes interchange well, For example
an APC 17 x 13 can swap with an APC 16 x14 with the same pipe settings.

Regards,

Eric.

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Lee Davis
Sent: Wednesday, June 18, 2003 11:06 AM
To: discussion at nsrca.org
Subject: RE: Webra 145 with Greve Pipe

The setup info I give on our web site is generic.  It works, but
temperature, altitude and fuel type are a few of the variables that can have
an effect.  Lengthening the pipe enhanced the mid-range in the particular
case I mentioned, though I hesitate to make a blanket recommendation.  I've
set up engines for many people.  I doubt any two ended up exactly alike.  As
is the case for much of our equipment, manufacturer instructions will get
you going, but they are not necessarily the last word.  It is in your
interest to experiment and optimize.

Lee Davis
Piedmont Models
http://www.piedmontmodels.com

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Keith Black
Sent: Wednesday, June 18, 2003 1:39 AM
To: discussion at nsrca.org
Subject: Re: Webra 145 with Greve Pipe

As long as we're talking about the Webra 1.45, RPMs and pipe length, what
are some experiences with the Webra 1.45 and the Greve pipe. Piedmont's web
site it recommends 27.5" to the first baffle, but recently Lee Davis posted
that he has his set at 28.5" to the first baffle.

Mine's actually running pretty well at 27.5", I'm just wondering if I can
improve it by moving it back an inch.

Lee, if you read this, why did you move yours out another inch over what
your web site recommends? What did this improve (top end, mid range, etc.)?

Does anyone else have experiences to share with this combination?

Thanks,
Keith Black

----- Original Message -----
From: "Jerry Budd" <jbudd at QNET.COM>
To: <discussion at nsrca.org>
Sent: Wednesday, June 18, 2003 12:00 AM
Subject: Re: Webra 145

> >Let's try again - what rpm are you guys getting with what props with the
> >Webra 145?  I'm trying to tune mine with a Bolly pipe and have no idea
what
> >to look for.  I'm trying both a 17X10 and 17X12N prop.
> >
> >Thanks for any suggestions.
>
> 82-8300 rpm when new, 85-8600 rpm after ~30 flights.
>
> Magnum #1, OS-F or YS plug, ES-2C140L90 pipe set at 23-1/4" baffle to
> plug, stock Mac's 2-1/4" rise header, and an APC 17x12 prop.  The
> Webra MC (mixture control) carb I'm using gives a dead linear
> throttle response with NO jump onto the pipe.  Setup this way the
> motor throttles exactly the same as a DZ but with better performance.
> With the stock ProMix carb it throttles a lot like the OS (rich in
> the mid range).
>
> Jerry
>
> --
> ___________
> Jerry Budd
> mailto:jbudd at qnet.com
> =====================================
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