"Joe Hull (Pilgrim Technologies)" wrote:

I'm concerned about temps when taxiing and waiting on the ramp.  I've
looked at electric fans for the radiator but was wondering if I

couldn't

just bolt a regular radiator fan onto the front of the engine drive
pulley and position my radiator in front of it. There may be enough

room

between the engine and the firewall for that to work.

Anyone know of a good reason NOT to do that?

Thanx,
Joe Hull
(JoeH@PilgrimTech.com)
Cozy MkIV #991 (working on Engine & Cowling)
http://www.maddyhome.com/canardpages/pages/JoeHull/index.html

I do Joe. The rad needs  a space behind it at least 50% of it's linear
dimension. If the rad is 20 inches wide the space from the firewall
to the back of the rad core needs to be ten inches or greater. The other
problem with
that is the rotary cruises at 5000 RPM so the fan will be sucking down
HP and therefore increasing the fuel burn slightly.

Paul Lamar

"Joe Hull (Pilgrim Technologies)" wrote:

As I understand it there is a centrifugal clutch in the RX-7 fan - I
presume it disengages at higher RPM's. Wouldn't that cut the fan out at
take-off and cruise?

Joe Hull
(JoeH@PilgrimTech.com)
Cozy MkIV #991 (working on Engine & Cowling)
http://www.maddyhome.com/canardpages/pages/JoeHull/index.html

The third gen and the RX8 have electric fans. The 2nd gen had a fluid
coupling that limited the HP the fan would suck down. It did not disconnect
the fan.

Paul Lamar


Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.