Kevin Richey wrote:

How about the quality of the hoses and connections,
one of your beat-the-drum issues about aircraft
downings due to loss of coolant?

Kevin

--- ACRE <rotaryeng@earthlink.net> wrote:

     > > >      What is wrong with these cooling

system

     > > designs?
     > > >

Paul:

My work says that mass flowrate is rho(density) x

A( area) x V (velocity) and since it takes a certain
mass flowrate of air to cool a specific quantity of
BTUs....it therefore takes a certain area

(A above) to allow that mass flowrate.  Yes,

diffusers are key, as is the incremental airstream
velocity, but if the area is not sufficient...the
mass flowrate is probably not sufficient.  My visual

windage says that his opening is less than 6" and

probably more than 5".  At 6" his area is 9 pi or
about 28 sq. in. and at 5" diameter, his area is
about 20".  Neither of these areas will flow

sufficient mass flowrate to cool 200 HP unless he

is in a very cool environment...or the temperature
increase through his engine is considerable above 50
deg F, generally considered the maximum

desired.

Doug in CO

All that may be true.
You are still not warm Doug :) You are getting too
complicated.
Hint! The problem is wide spread and very very
simple but subtle and low tech.

Paul Lamar

Kevin Richey wrote:

How about the quality of the hoses and connections,
one of your beat-the-drum issues about aircraft
downings due to loss of coolant?

Kevin

Very true and that was mentioned already. Still not the major problem.
I guess this exercise illustrate why so many builders make the same
mistake.

Paul Lamar
 
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