X-Mozilla-Keys:                                                                                 
Al Gietzen wrote:

Paul:

Bulent Aliev wrote:

The radiator is 6"x21" Griffin. Engine GM 4.3 litter V6 200 hp. There is
a long article on it in Contact magazine issue 48

I think this is the same one I saw at OSH a couple of years ago.
It is a Canadian aircraft as I recall. the owner said he thought
it had a lot of drag. Do you recall how thick the rad is?

Nice work but wrong concept.

This is Dan Englands Velocity.  The radiator is 3" thick (2 rows of tubes,
1.5 each).  The radiator is contained within the scoop, and the air is
ducted out the back with an adjustable exit.  The inlet area to rad face
area ratio is 0.25.  Seems like everything is right for low drag and
effective cooling.  His results bear that out.  He is cooling a 200 hp
engine effectively with a radiator area of only 126 sq. in.; better than our
theory says is possible.

Perhaps it is not 200 HP Al :-) PL

 It may be worth noting that he has a very high output coolant pump (I don't
know the flow rate), and a 195 F thermostat; so his average rad temp is
pretty high.

On the down side, in a pusher configuration this arrangement probably causes
considerable turbulant (and heated) air into the prop which likely rduces
prop efficiency.  But then, in a pusher there is little choice but the run
exiting cooling air and the exhaust through the prop in some manner.

 
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