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I see now. I like the tie offs. It appears that
takes care of the x and y movement. Nice job.
Now, that begs the question about z axis. I did a
quick calc (could be wrong), it looks like the two ends of each tube will
lengthen by 1/4" if you go from freezing to warm engine. Nothing you can do to
stop the movement, but perhaps you can reduce the effect. It will push and pull
rad. So if rad mounted too firmly, you have risk. Normally hose ends are longer
to absorb this movement. You might be ok, but I'd change it. Then there's the
bending moment where your rad tube turns. I'd add another hose just past bend,
say 1 ft long or so. This makes your design insensitive to expansion, vibration.
Adds a big safety factor.
Finally, you are all done. Then it's time to assume
you overlooked something that will eventually fatigue the tubing. So you super
glue some pieces of thread from tubing to fuselage. If thread breaks, you have
advance notice of fatigue failure down the road.
When I do creative stuff, similar to what you've
done, I force myself to sit back and say: "It's going to fail. Now, where and
why?". "What action will reduce risk?" Computer monitoring of coolant pressure
is good one, as pressure will drop long before you run out of coolant.
Good job venting rad btw.
-al wick
----- Original Message -----
Sent: Wednesday, July 22, 2009 11:20
PM
Subject: [FlyRotary] Re: Fw: Belly
Scoop
You're right to an extent Al. We are going
flex from the oil cooler to the exterior of the scoop, rigid to the entrance
of the cowling, and flex to the engine. We have flex at the radiator
connections, rigid to the cowling, and flex to the engine. Everything is
tied off, just not apparent in these images.
Greg
----- Original Message -----
Sent: Wednesday, July 22, 2009 10:58
PM
Subject: [FlyRotary] Re: Fw: Belly
Scoop
If I'm seeing pics correct, you have hard lines
going from one component to another(oil lines). This is high risk. Makes the
installation sensitive to fatigue failures, differential expansion,
resonance. Take a look at your car, you'll find almost all hard lines
terminated with flexible hose (like your rad lines).
Even if you have flexible hose, you need to
plan on tying the lines every few inches to control vibration. The hardlines
will become "S" shaped during flight.
If I'm seeing wrong, or you have already
planned this stuff...........never mind.
-al wick
----- Original Message -----
Sent: Wednesday, July 22, 2009 10:36
PM
Subject: [FlyRotary] Fw: Belly
Scoop
Couple of more shots.
Greg Ward
Lancair 20B in progress
----- Original Message -----
Sent: Wednesday, July 22, 2009 8:48
PM
Subject: Belly Scoop
Hi
Greg,
I am anxious to see what you
get on the dyno with your engine! It should be a screamer!
What is the opening size of the belly scoop and where did you get the
scoop? I am thinking of something similar with my FG. How do
you direct the air inside the scoop to go over both the oil and water
exchangers? How do you control the cowl flap? You said
manually??? How?
Bill
B
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