Paul:
Would you happen to have a CAD model of a 20B with PSRU that you could
lay into a Skybolt to see what kind of space problems or luxuries might
present themselves?
Any ideas you might have regarding the application would be greatly
appreciated.
I've been following the work you have been doing for the past couple of
years and now have a virtually completed Skybolt in need of about 325
HP. The problem is 325 HP out of a Lycoming IO 540 is more than I can
afford. Too many college age kidds on the payroll.
Jim Kidd, Mequon WI
Jim can you scan those dwg in with higher rez? Can't quite read them.
Paul Lamar
Paul:
Hopefully these tifs will give you the detail you need.
Jim
Much better Jim. Thanks.
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I think you are going to need a power bulge in the cowl :)
This is a BIG turbo. You won't need one this big unless you
are looking for 1000 HP :) No oil pan shown yet.
Side mounted intake manifold and intercooler.
One thing about a dry sump. You won't have to worry about
turbo drain back.
-----------------------------------------
Here are a few 3D. I would dump the stock Mazda water pump
and place a mechanical belt drive water pump down on the lower right or
even under the engine since you are using a dry sump system
and you have room under the engine. Too much congestion up around
the turbo and stock water pump.
No starter is shown as by the time you are ready for it the
alternator/starters should be available. BTW a conventional starter
is not possible with a Bell 47 PSRU anyway. Dave Garber
used an aircraft starter with a custom front cover and drive.
The Bell 47 PSRU would give you a bit more room behind the
engine as it is shorter than all other PSRUs.
Ed Klepeis can build you an intercooler that looks like this
and a dry sump oil pan. Edward Klepeis
This is a side port turbo 3 rotor but a P-port turbo 3 rotor
would give you up to 1000 HP for shows.
I beefed up the motor mount for 10G's mainly using one
inch .049 wall 4130 tubing instead of 5/8th and 3/4.
The rear mount is not shown yet. Depends on what type
of front engine cover you wind up with. The first gen
RX7 front cover is the strongest.
I moved the Schertz beam back a couple on inches under
the rear end housings since you are going to build a
custom dry sump oil pan anyway. I turned it up side down
and bolted it to the end housing using the oil pan bolts.
Same as Bill Schertz did originally. For aerobatic
use I would run a couple of 1/2 inch square 4130 brace tubes up
at a 45 degree diagonal to the engine. Not shown in the
3Ds yet.
Paul Lamar
Paul:
These 3Ds are really helpful. Thanks for your time on them. The question
at this point is P-port or turbo? The Skybolt will only handle 400HP, as
I built it according to the plans and did not beef up the 4130
structure. Since the empty weight will be slightly under 1200# anything
above 300 HP makes for spectacular vertical performance.
I am thinking the Powersport front cover with the built in 3 stage oil
pump is the way to go. I believe the guys at Powersport told me they
sell them to Mazda for racing applications.
Jim Kidd
I would save the turbo for the high altitude cruisers
like myself.
Paul Lamar
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