If you see something that does
not look right please let me know.
Paul Lamar
Paul,
It looks like you could take advantage of the turbine exhaust thrust
by aiming the pipe rearward. (the waste pipe also!)
Barry Bordes
True but at this
point we are just trying to get it together so we can
run it. Jim Mederer flew up for
an inspection and insisted we needed an oil cooler.
He told us the warrantee was void unless we
put one in so now we are doing it to keep
him happy. We are using a 11" by 18" by 2"
Setrabe AN -16 fittings in and out. It will
be here Thursday. Cost $600.
It is no where near big enough for continuous
650 HP use but both Dan and
I believe five gallons of oil won't get very hot in 91 seconds. That is
all we need to get the record.
Most of the oil coolers I can
find today are poorly designed by being
too thick and not large enough in frontal area. This includes
the Setrabe. It is like they did not read
the bible of heat exchangers
"Compact Heat Exchangers" by Kays and London or let alone my
book "How to Cool Your Wankel".
Mistrale got it right back in 2009 but I do not know their
oil cooler supplier, I wish I did.
However, we are prepared to spray a lot of water on it for
evaporative cooling effect if needed.
--------------------------------------------------------------
We bought a Setrab 11 by 18 by
2 inches thick. Not optimum by a long
shot but it is an oil cooler.
Here is what it looks like mounted under the
cross counter flow water cooling system. It
will add half a gallon of oil which will
delay oil heating by 15 to 20% :-)
Paul Lamar
Paul,
If you have any excess thermo capacity in that large water radiator you
might use a water to oil exchanger to good avail.
Barry Bordes
Excess water cooling is an unlikely event in this case. We will
probably have to hose it down with total loss water :-) The water gets
hot much faster than the oil as there is way less of it. Maybe as little
as a gallon and a half total.
However in the case of the oil we have a five gallon oil tank and there
is not much oil in the engine at any one time. Just what the bearings
will need and a little oil in the rotors for cooling.
The oil squirter’s for the rotor cooling are only .125" diameter max.
One can't get gallons per minute through those size holes. Even at 150 PSI.
In general water to oil heat exchangers are bad ideas as you are putting
all your cooling eggs in one basket :-) Oil is one third the cooling.
Paul Lamar
Paul,
Are you putting an air/oil separator on the vent tube from the tank? We
built one for Steadfast that drained back to the case. Basic can with
baffles, but we filled it with copper scrub pads. The air passing
through the scrub pads condensed the oil and our oil losses out the vent
went to almost nothing.
Larry CHilds
Yes check those pictures on your cell phone :-)
Here they are again.
Sounds like a good idea. Too late for this project as we got to get
it running soon. Remember it only runs for 90 seconds.
Come to think of it we could use
a total oil loss system. Forget all this oil cooler stuff. I doubt seriously
we would use 5 gallons of oil squirting it through two 1/8th in holes
in 91 seconds. Think of it as a smoke generator at an air show :-)
Paul Lamar
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