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-   -   a couple printed ideas (https://vansairforce.net/community/showthread.php?t=147771)

Fly2KiteSurf 03-21-2017 06:45 PM

?
 
http://www.jdair.com/fuel-drain-fair...s-rv-aircraft/

rocketman1988 03-21-2017 07:03 PM

What plastic?
 
What plastic did you print in...

Hopefully not PLA because if you did, they won't last long as it is biodegradeable...ABS would be better but not sure of its resistance to gasoline. If your printer can get to 235 degrees, you can print in a nylon blend which I have used before and works pretty well...

Steve Melton 03-21-2017 07:28 PM

Quote:

Originally Posted by Fly2KiteSurf (Post 1159722)

I have these currently installed and recommend them, however with my paint they don't engage as fully as before paint. I thought I would try similar in plastic. The ABS plastic will not scratch paint. These are printed hollow, 4 cover layers, 40% in-fill, weight = 16 grams. I believe the weight could be reduced to 13 grams. Fit check and final tweaking still needed since I sketched these from memory.

kaweeka 03-22-2017 08:02 AM

Amazing!!!!

Lynnb 03-22-2017 12:19 PM

Are you going to try and smooth them any with an acetone wash or fuming? Any chance you want to share some files? ;)

Lynn

dwranda 03-22-2017 03:41 PM

I had my son design me one of those last semester when he wasn't too busy with school work. Came out pretty good, but he wants to tweak it a little.

Steve Melton 03-22-2017 08:11 PM

Quote:

Originally Posted by Lynnb (Post 1159884)
Are you going to try and smooth them any with an acetone wash or fuming? Any chance you want to share some files? ;)

Lynn

no, they are smooth enough for me. yes, I'll drop the files out to a shared location when completed.

Lynnb 03-24-2017 07:08 AM

Quote:

Originally Posted by Steve Melton (Post 1159999)
no, they are smooth enough for me. yes, I'll drop the files out to a shared location when completed.

Cool, thanks.

Lynn

N941WR 03-24-2017 07:23 AM

Can you incorporate a small piece of screening material in it to keep the bugs out? (Mud daubers are a real pain in the South and will build a nest in any opening they can find.)

Quote:

Originally Posted by Steve Melton (Post 1159479)
maybe a little proseal on the cylinder is enough to adhere. weight = 16 grams. first trial, size is not final. plastic cost = $ 0.42. may also improve the life of the o-ring since it will eliminate vortex shedding vibration of the stem that is in the airstream.





Steve Melton 03-25-2017 09:03 PM

Bill, I attempted to make the fairing removable if needed for access or to clean out mud.... I used the same idea as the JD fairing because it's good, a set screw at the fwd edge.

JD fairing didn't seat fully because of paint. I've been flying with this for a year, no problems.


printed fairing, Eppler 863 airfoil, thickness increased from my first prototype made from memory, my memory wasn't very good. it's a solid fit. I like it. the ABS plastic will not scratch the paint.













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