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

Steve Melton 04-08-2017 06:21 AM

If you print with finer resolution tell them to adjust the settings to achieve roughly the same part thickness. mine are printed using a .5mm nozzle that extrudes .6mm.

there is enough margin in this design that just about any printed fairing will be fine.

humptybump 04-08-2017 06:36 AM

Steve makes a good point regarding print/slicer settings. They have a strong correlation with nozzle size and layer thickness and material.

While I often use two perimeter walls and two (or three) top/bottom layers on a Lulzbot TAZ printer, I use four perimeters and four top/bottom layers on a Delta Kossel printer.

lstinthot 04-08-2017 06:51 AM

I'm not sure what software you are using but EAA members are able to download Solidworks for free. Then there is a website to upload your designs to share, https://grabcad.com/library/software...cent&query=Eaa.

I'm just beginning to start using the software. It's not too hard to learn.

Snowflake 04-09-2017 01:05 AM

Why switch to ABS? Is PLA sensitive to fuel?

Steve Melton 04-09-2017 05:21 PM

Maybe a glow in the dark ABS for under the wing?

Steve Melton 04-19-2017 05:14 AM

more testing
 
fuel soaked fairing, another week on the torture pipe. no signs of relaxation.



another fairing soaked three weeks in avgas. VC-3 thread lock turned pink but otherwise seemed secure. turned set screw one full turn on the torture pipe. no signs of weakness.



attempting to drive this fairing to failure. fuel soaked one week. two turns of the set screw. significant load and twist in the allen wrench. no immediate failure. will leave it on the pipe for a couple weeks.





My photo of a Grand Canyon California Condor last week, ~ 10ft wing span. It was making fwd progress in a 40 kt headwind without flapping. Check out those wing tips.


Snowflake 04-19-2017 03:20 PM

FYI - On Friday I placed a couple of test pieces of PLA-printed parts into an avgas bath to check durability. No degradation was visible by Saturday evening, will check again this weekend to see how they're doing. So far, i'd say PLA parts are acceptable for the bottom of the wing.

RV7A Flyer 04-19-2017 03:32 PM

Are y'all expecting your fuel drains to leak continuously?

If they don't leak like a sieve, isn't the drain fairing *dry* all the time, other than on occasional drop of fuel when you check it during pre-flight?

Weeks on end in avgas soak test seems, um, overkill to me...

Steve Melton 04-19-2017 03:38 PM

well yeah, now is the time to kill them if we can.

Saville 04-20-2017 07:20 AM

Quote:

Originally Posted by RV7A Flyer (Post 1166905)
Are y'all expecting your fuel drains to leak continuously?

If they don't leak like a sieve, isn't the drain fairing *dry* all the time, other than on occasional drop of fuel when you check it during pre-flight?

Weeks on end in avgas soak test seems, um, overkill to me...

No harm in doing the test.


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