>Jerry Hey wrote:
 >>
 >>  Paul and everybody,  please comment:      I am thinking of placing
 >>  the butterfly and the injector in the insert.  This one piece would
 >>  require all the machining and the rest of the system could be plain
 >>  tubing.  The disadvantage would be  having the injector on the hot
 >>  side.   Shielding the exhaust pipes would have to be very well
 >>  thought out.  The advantages are throttle response (not so important)
 >>  and, according to the Leman engine tech paper, increased fuel economy
 >>  (very important).
 >>  --
 >>  Jerry Hey
 >>
 >>  Tailwind & Rotary Engine Support
 >>
 >>  http://www.j-winddesigns.com
 >>
 >>  mailto:j-winddesigns@thegrid.net

 >Sounds OK to me. If you are using two inch tube you
 >could use this casting and put the injector over on the
 >cold side. Also it has the required bell mouth
 >which is worth 5% in HP. Jim Mederer says you get better
 >fuel consumption with the injector near the bell mouth.
 >Since you will be selling these it might be a good idea
 >to use what you sell :-)
 >
 >Paul Lamar
 >

    Jim Mederer's claim for better fuel consumption with the injector
 near the bell mouth is contrary to the Lemans  tech article  which
 claims better fuel consumption when the injector is  close to the
 port.  Wonder why?

 Jerry Hey

 Tailwind & Rotary Engine Support

 http://www.j-winddesigns.com

 mailto:j-winddesigns@thegrid.net

I have the SAE paper 920309 in my hand. Page six paragraph (3).
No such statements. They are talking about **driving fuel consumption **.
Not steady state fuel consumption.

Here is a gif of the paragraph.

We have had several in-flight fires. It is a good idea to keep
the fuel and the oil as far away from the exhaust as possible.


Paul Lamar

I have just reread the article and you are correct.  Looks like cool
side injectors are not only safer  but better as well.   

Jerry Hey

Tailwind & Rotary Engine Support

http://www.j-winddesigns.com

mailto:j-winddesigns@thegrid.net

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.