Jerry wrote:
Your drawing showed the S beam ends sticking through the sides of
the
cowl so I had to deal with that first. Until we get the cowl
drawn as it really is we cannot have faith in the drawings
predictions. The physical model looks a less alarming regarding
room
over the top. Then there is the possibility of increasing the
spinner
diameter a TINY AMOUNT and, at the same time, raising the top of
the
firewall JUST ENOUGH to get what we are looking for while
retaining
the look of the Tailwind and the ability to see over the nose. I
don't
feel I have exhausted my options yet.
Paul Lamar responded:
I fixed the cowl even though that had no bearing on the real
problem.
More bad news. Even my mail box intake manifold won't fit the
stock cowl. This one is made with the 3 inch center line radius
2 inch tube. Would be slightly smaller with the R$B Wagner pipe.
You will never see over the nose :) I can make a blocky cowl that
fits if that is what you want :)
If you're going to make spaghetti intake runners, why not make them
face
forward next to the starter, and use the cheek intake to feed it?
Russell Kent
Yes. I'll try that. You mentioned it before and I got side tracked
with
the stock tail wind cowl issue. Good idea. Jerry will have to give up
one of his oil coolers or put a stock cooler alongside the rad
under the engine with longer cowl flaps.
Paul Lamar
Excuse me for not being blown away by the obvious to you which is not
obvious to me in my shop at all. I went ahead and added a 4 inch dia
plenum to the end of the intake runners. It can be square, does not
matter. I kicked the end of the runner down with a 45º. Once
again,
here are photos of the actual, real, physical reality. They paint a
pleasant picture. I accept that I may be guilty of some strange
error
and that you are right. I have experienced that before. But so
far,
it does not seem that way
Again the tube represents the line of the cowl. Once you get
to
the cool side, there is plenty of room for an air filter and ram air
too. The cheek openings (2.75" x 7") are sufficient to cool a Lyc
0-360. The rotary oil coolers are expected to handle 30 percent of
the cooling load or 15 percent per each side. I think there will be
plenty of air for them and for the intake too. Let us say I use
half
of the cheek opening for ram air. That is 9.5 sq inches of opening
for
the ram air compared to 7 sq in for the three inch snorkel. Or if 7
sq in is enough than the oil cooler can have 11.5 sq in. What is
wrong with that? Jerry
No the tube does not represent the top of the stock cowl.
The stock cowl drops down on both sides of the spinner.
Paul Lamar
I clamped a straight edge to the backing plate and laid the tube on
it not on the edge of the backing plate. The straight edge is 4.5
inches from the center, or the equivalent of a 9 inch spinner or the
rough equivalent of the cowl height outboard of the 12 inch spinner
ring. Jerry
Now we are getting somewhere. Your sketch is not to scale and or is wrong on
the bend shape.
Is my drawing correct as to the thrust line relative to the top of the firewall?
Paul Lamar
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