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Date: Fri, 23 Jan 2009 14:05:02 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Heavy Fuel?
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Dale Rogers wrote:
>
>   With direct injection - just after the intake ports are
> obscured - a realistic possibility, I wonder if the 13B
> couldn't be a star platform for a heavy fuel solution.
>
>   Hmm, I've got an extra engine, and if I can ever get the
> "fly" engine on the airplane ... nah, just another distraction
> to keep me from finishing the COZY.  After that?
Diesel needs the high compression to get the fuel-air mix above it's 
auto-ignition temp.  Could you get the same temps with a turbo without 
the intercooler and/or preheating the fuel before the injector with a 
oil-to-water heat exhanger?  You'd probably need a small tank for gas to 
warm it up, or adding an electric heater if heating the fuel were 
sufficient. 

Heat the fuel to something on the order of 500*F, and it will be like a 
flame thrower going into the cylinder.  It will ignite as soon as it is 
exposed to oxygen (it would possibly coke in the lines, too).  Take the 
heat off of the exhaust, and it wouldn't even need spark to keep 
running.  Of course, it would probably melt the housing around the spark 
plug hole in short order.  Can't have everything, ya' know.  8*)