> > > Paul,  here are two photos of my Griffin Rad with fan. The fan

 > > produces a whopping 1800 cfm.  It weighs six pounds. It is mounted
 > > securely with brackets and bolts (no tie wraps).

tom jelly wrote:

 where did the fan come from?  Griffin?

 Tom> >

Tom,  I bought both the rad and the fan from Summit.  I tried to buy
the rad with AN fittings  and no filler but they wanted nearly
$200.00 more for the " special order" so I bought the stock unit
which I will modify myself.  The rad cost $279.99 and the fan was
$179.00.   The rad and fan both are intended for racing applications.
I tried to deal directly with Griffin but they apparently no longer
are doing this.  They gave technical advice and then told me to order
it through a dealer.  Jerry

 marc wiese wrote:

What about the concern that at 200mph your fans will be spinning like a top
and eating up those fan bearings? It would be a bad day if a fan came loose
because of it. Check those fans often!
It seems if you had fans, you would want them in a duct you could close off
and open only when you needed the air.
Marc

In a properly designed duct near the rad face the air should not be
moving that fast. Probably only about 30 to 50 mph. Still enough
to spin the fans however and cause bearing failure. It happened
to a guy out in Camarillo CA with a water cooled V8 pusher.

Paul Lamar

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