X-Mozilla-Keys:                                                                                 
Tom P. wrote:

Paul L:

I've been quietly monitoring your rotary engine site for over six
months.  It has been a steep learning curve for this non-engineer, but
I appreciate the varied system discussions as they pertain to my
Lancair ES 20B project.  Like your KIS project, the ES has abundant
space for radiators, intercoolers, turbos, etc., except the stock nose
gear/engine mount precludes any thoughts of an under the engine
radiator location.  Dave Atkins had recommended the same location, as
per his RV-6, several months ago.

Alan Tolle"s arguments and experience favoring the radiator behind the
engine location seem to have been largely ignored recently.  True,
that arrangement requires two 90 degree bends in airflow, and may not
be as sophisticated as a P-51 type scoop, but apparently it works just
fine if you have sufficient room behind the engine.  It worked for
PowerSport and it works for Belted Air Power's Chevy 4.7 V-6 powered
RV-6 which performs neck-to-neck with Van's RV-6 prototype, which
doesn't overheat on 110 degree days in Las Vegas.

My decision to locate the radiator behind the engine was ensured when
I discovered that Ross could produce a PSRU with a 3" shorter bell
housing (11.5 inches to front of prop flange), and. yes, with a thrust
bearing designed into it.  This allowed retaining the original Lancair
ES cowling (with added cowl flaps), and will provide a clean
installation with minimal plumbing (two short hoses from water pump to
a crossflow two-row radiator)

I plan to create a pressure/diffusion duct to direct virtually all
intake air through the radiator, except that required for small blast
tubes for cooling accessories, and air diverted to carry turbo heat
overboard.  For now, I plan to use the stock Mazda oil cooler, but
have not selected the intercooler.  A manually operated wastegate,
with 5 psi spring, is planned (similar to Chuck Harbert's Velocity).

 
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