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Date: Mon, 20 Oct 2008 08:13:01 -0700
From: Dale Rogers <dale.r@cox.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Water in Fuel?? (or another adventure in the aviation
 events of Ed Anderson)
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Ed Anderson wrote:
> ...
>
> Normally there is a non-event, there is no hiccup or hesitation – 
> normally! Well this time things were different, the engine started to 
> surge - big time – as did my heart. The fuel pressure is wiggling a 
> small amount but clearly with pressure above 35 psi it is adequate.
>
> ...
>
> I then turned off my secondary injectors - the engine began to run 
> smoothly (although I don’t know if this was more than a coincident of 
> timing). So recalling my lesson learned from that earlier incident 
> (switch tanks, dummy!), I switched back to the right tank – happily 
> every thing settled down (including my heart) and the engine ran normally.
>
> I am not certain why hitting the “cold Start” switch would have made 
> any difference, but I did turn it on twice and each time the engine 
> settled down. Also when the secondary injectors were momentarily 
> turned off the engine smoothed out.
>

Ed,

I'm thinking that when you switched tanks, maybe the secondaries got the 
bulk of the slug of water?

When you switch on "cold-start" you increase the pulse width to all 
injectors, right? When you turn off the secondaries, there was probably 
little to no water in the feeds to the primaries. So, either one results 
in a higher fuel to air ratio, making the engine run better. Eventually, 
the water is either consumed or so thoroughly dispersed in the fuel 
(including some in the other tank, since you switched back) that it has 
no noticeable effect on the running. Check your tanks this afternoon.

Dale R.