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Date: Thu, 22 Feb 2007 14:29:44 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Flooded plugs
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On Thu, 22 Feb 2007 16:10:59 -0500
Bill Bradburry <bbradburry@allvantage.com> wrote:

> I am gradually learning how to start my engine.  When I began, I started 
> with a couple of taps on the primer and with the mixture set full rich. 
>   I flooded the engine and that started a cycle of remove plugs, blow 
> the fuel out of them, fiddle with the mixture, cold start, or primer, 
> then try to start, remove plugs...etc..
> I was getting pretty frustrated....So I called Tracy!
> One of the things he suggested was trying new plugs...So I bought a set, 
> but decided to clean the Renesis plugs in a sand blaster and try them 
> one more time.
> I also decided to set the mixture about 1:30 instead of full..no joy...I 
> moved it to about 2:00...It tried to start!....I moved it to about 
> 3:00...RRRIIIPPPPP!  Yea!!
> I had been using too much fuel on my starting attempts and, as I read in 
> the archives, sometimes when the plugs foul, they will need a good 
> cleaning or replacement.  Tracy tells me that sometimes after you get 
> the engine running with good plugs, it will also run if you put the bad 
> (cleaned) ones back in.
> 
> Now...Who knows what factors affect the HP calculation that Tracy uses? 
>   I still do not have the engine mixture properly trained, but I decided 
> to check my static RPM today.  2 Blade Performance prop..76X88.  I only 
> got about 4200 RPM, but the HP at one time was at 257!!!  :>)  Without 
> the cowling on, the prop blast is directly into the throttle body and at 
> one time I also saw 31.5 inches of manifold pressure!!
> This could turn into a lot of fun!  I need to get back to trying to 
> build the plane..:<(
> Any and all thoughts are welcome!
> 
> Bill B
> 
Hi Bill,

I normally set the mixture to about 3:00 also with cold start on.  When
it's below 40 or so, I give the primer a couple of pushes, then open the
throttle about half way with my hand on the know ready to pull it
back.  I haven't had to pull the plugs.

I think Tracy's HP calculation is just based on fuel flow and the BSFC
setting in the EM2.  It seems like there was another parameter that
modified it slightly but I can't remember what.

I've never seen over 24 in. manifold pressure.  This sucker should
really go if I can get some air to it.

Bob W.  (Rotary engine suffering from hypoxia.)

-- 
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
First Flight:  11/23/2006 7:50AM - 3.3 Hours Total Time
Cables for your rotary installation - http://www.roblinphoto.com/shop/