Paul,

 I have been trying to get the exhaust runners to 36" and end at the same
 location.  What is more desirable having the tubes end at the same
location
 or both ending up 36" in length?  Space is tight and the slide throttle
 being above does not help.  Thanks for any assistance.

 Joe Berki
 Limo EZ

 A little of both :). It is probably better to be on the short
 side and have both come out in the ejector throat in the same
 place.

 I assume you have NACA Report 818 so the area and length
 ratios are correct. If done right it can have a significant
 effect on cooling.

 If you don't have it and cannot get it
 from the NACA web site  I can upload it to the ACRE web site
 and you can download it from there. Too big to publish.

 Here are a couple of charts and a table from that report.

 Paul Lamar



Paul,

Yes I have seen the report and have a copy around here.  I took another look
at the slide throttle on the flight motor and it seems close enough to the
block that I can snake the aft pipe over the forward pipe giving me a better
chance of having both tubes exit at the same point.  I don't know where the
exit point would be with respect to the divergence in the ejector if a
collector was added.  Thanks.

Joe Berki
Limo EZ

I don't think you have room for a collector.

Here are a few of my old 3D's on the idea.

A good argument for getting Rhino and laying things
out before building. Foam mock ups are the poor man's Rhino.

Paul Lamar