|
Bill, with that much pressure, I think there is little
question you could flow considerable amount of hot air out the top of your
cowl. I presume you would use louvers in that area to provide
an exit for the hot air.
I initially considered putting my louvers in that
area rather on the side as I have them for that reason. However, I became
concerned that the eternal oil seepage of my Ross Drive would keep my canopy
covered with a mist of oil. So I compromised and placed them on the
side.
Its not much of a surprise to find the air flow over the
top of the engine has a higher pressure build up due to the firewall and poor
flow exit area, but interesting that it is that high.
There is no doubt those louvers would aid cooling on the
ground and during taxi. During flight, the top of the cowl is a low
pressure area (as shown in this pressure distribution diagram of an RV-6A )and
would be even more so in a climb, so I would think it would help during
climb and to a lesser degree during cruise. Red/yellow/green/blue from
lowest to highest pressure distribution in diagram.
Ed
----- Original Message -----
Sent: Monday, June 05, 2006 11:24
PM
Subject: [FlyRotary] cooling
louvers
Ed,
Do you recall where you got your (now un-necessary) louvers? I am
going to try an area at the top of my cowl. Can't seem to find a source
for these louvers. I need 12" X 6" with the cuts going the long
direction.
I ran a test today and found a minimum of 2" H2O trying to force air OUT
that area. That was with my cowl flap full open. (MUCH more
pressure, of course, with the flap closed.)
Does anybody think that will make a significant change in cooling air
flow or am I wasting my time?
--
Bill Eslick
www.weslick.com
|