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Carbon fiber NACA duct?

These NACA lookalikes just are not going to work well. The dimensions, shape, ramp and lip must be done correctly. Have seen a lot of silly looking copies that don't do squat. Have seen some set backwards for exit air which is really ridiculous.

Here's a good article from an earlier thread: http://www.recumbents.com/WISIL/nacaduct/naca-duct.htm

The suggestion to follow the lead of the really fast planes is probably best for this application. And that Lancair reference is to a local guy that put a LOT of thought into his cooling and intake drag. Gained a bunch of cooling and speed with his new inlets.
http://www.n91cz.com/Pressure/N91CZ_Cooling_Drag.htm
http://www.n91cz.com/airbox/airbox.htm
 
I made em.

I copied the plastic ones Van's sends out. If that design is good then these should be okay. The big IF. I'll dig up a picture here shortly but they look cool in carbon and will probably never need replacing.
 
Pictures

1315329172.jpg

1315329175.jpg
 
Proseal

You guys can use Proseal to hold the vents on..no rivets ..wouldn't that also make a barrier for carbon/aluminum interaction?

Best,
 
ChiefPilot said:
Isn't the second picture going to cause corrosion problems? I thought CF against aluminum was not recommended - is that not true?
Click to expand...

I do a lot of work with carbon fiber. I generally avoid direct interfaces between carbon and steel or aluminum, but I haven't seen much in the way of problems with it. Usually I just make sure that there is an insulating layer of fiberglass between the carbon and the metal. With pre-cured components such as the vent in question, it hasn't seemed to be a real issue.

The one thing that I never do is laminate carbon cloth directly onto a metal component. That has a much greater probability of creating a direct connection between the carbon fibers and the metal. I have seen that go bad very quickly, with massive galvanic corrosion between the carbon and the metal.

Thanks, Bob K.
 
The vents are coated with clear urethane and then I used silver silicone between the two. I think there's enough barrier. Time will tell.
 
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