Bill, I checked my rad to see if it would fit in the
new configuration. Looks tight but I think it will
fit with no cowl modifications other than loping off
the hump on the bottom of the cowl which I was going to do anyway.
Here is a shot looking in the left nostril and you
can see the rad just touching the cowl. Perhaps a little
chamfer is called for on the rad header tank.
My rad is a stock Howe Racing $200 all aluminum. 27 1/2 inches wide
over all. 24 inch wide core. A slightly shorter rad would fit
better of course. A two pass version would get both inlet and
outlet on the same side of the engine as the water pump.
14 3/4 inches fore and aft core.
Header tank is 3 inches wide by 1 3/4 inches wide.
The core is 2.25 inches thick. Probably a bit big for a NA 13B but
I hope to get at least 250 HP out of my turbo.
To obtain a 25% inlet opening area the front of the wedge will only
have to be four inches high.
I will build a new test box using this rad and the transverse scheme.
I will also build a set of venetian blind cowl flaps to test.
I can try different ducts feeding the wedge.
Stay tuned.
Paul Lamar
Dean Head wrote:
Paul,
Would you post some more pictures of this engine. I am interested in how
the
intake is plumbed and other general configuration issues. Is there an
intercooler?
Thanks
Dean Head
Cozy #1040
The intake is not plumbed yet. Next Monday I start on a new pattern for
the new cast intake manifold. Here are some old drawings. I might do a 3D in
the
near future if I can find time. The slide throttle goes between the
turbo and the intercooler with a push pull rod going straight back
to the instrumental panel. The rad setup shown will be redone.
Paul Lamar
Thanks...Look forward to seeing the continued development.
Would you have a photo of the other side of the engine showing how the mount
attaches to the block?
Dean
Same as the right side. The motor plate takes all the loads and incorporates
the rubber bushing motor mounts. It also directly takes
the thrust load as well as roughly an 800 ft pound peak torque pulse
applied to the prop from the gear box. I am not exactly sure the exact peak
value as it is mitigated somewhat by the rubber bushings in Tracy's torque
isolator plate. Peak torque is roughly twice average engine torque and average
torque at the prop is up to 400 ft pounds. Two times engine average torque
because of the 2.17:1 gear box. Since the rubber bushing are about three feet
apart they see only a 266 pound vertical pulse. If they were only
one foot apart they would see the full 800 pound vertical pulse and would
need to have roughly three times the travel for the same pulse absorption.
This is the main reason the Questair Venture is one of the smoothest
airplanes flying. I copied that design. It was designed by Jim Griswold
of Piper Malibu fame and Ed McDonald.
IMHO a major breakthrough in aircraft engine motor mounts.
Paul Lamar
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