Ed, Tracy, Fin and anybody else flying a tractor rotary powered
airplane with rads under the cowl. Please measure your under cowl pressure
with a water manometer at 150 MPH. This data will help greatly
in determining the future direction of rotary engine cooling.

Also please consider sealing the area around the nose of the
PSRU and measuring the cowl pressure again.

BTW Here is a picture of some of the air outlets on that
Turbo Lance I mentioned. There is another set of louvers on
the other side in the same place as well as two bottom outlets
with cowl flaps.

Apparently this curve on the cowl is a low pressure area
as the air will tend to speed up and move laterally here
because of the high pressure build up in front of the
windshield.

Paul Lamar

Ken Powell wrote:

Paul,
There was an article in Sport Aviation about 3 years ago that showed the pressure distribution for an RV-6 (this was done by the same guy that did the P-51 pic that you show pretty often).  The front end of the cowl and the prop spinner were VERY low pressure.  I have given thought to putting vents right at the top, front of the cowl - this would evacuate air during flight and allow heat to escape after a flight (especially for a tail dragger).
Mike wills mentioned this article a couple of days ago.

Ken Powell
kenpowell@aristotle.net

Worth a try but back it up with pressure measurements.
My scanner is down again so if anybody has this please email it.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org