----- Original Message -----
Sent: Thursday, July 23, 2009 7:08
AM
Subject: [FlyRotary] Re: Fw: Belly
Scoop
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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