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Wings only project

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skyte
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Re: Wings only project

Postby skyte » Thu Nov 10, 2016 9:51 pm

Looking good!
There's a PLA filament by a company called Floreon here in the UK. It has additives in it (all natural, plant derived) that give it great strength properties. It's much more like ABS than PLA. Not sure how well carbon will bond with it though. I've used quite a lot of it and it prints really well once you get the settings right for your printer.
http://www.floreon.com

skyte
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Re: Wings only project

Postby skyte » Thu Nov 10, 2016 9:56 pm

tkettlepoint wrote:sweet looking cnc there brother I should of went 4x8 but only went 32 and 50 that is heavy enough to do alum moulds. But I am looking at making a board shaper this winter. 32x120 I work for a cnc company part time and can get all the rails /steppers/ racks at cost now and have enough 80/20 to build 4 machines


terrie
Nice! If you go for rack and pinion along you long axis then make sure you build the rack against a solid straight edge. Mine is just bolted to the top of the aluminium section and it was so hard to get it perfectly lined up. Over such a long distance it can give you a varying backlas along the length which you can't compensate for in the software. I would definitely go for ball screws if I did it again but they add more cost!

tkettlepoint
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Re: Wings only project

Postby tkettlepoint » Fri Nov 11, 2016 1:52 am

yeah ball screws are nice but I have the rails and rack all set. I work for www.trackercnc.com and have access to the rails on the plasma tables for side rails. I am going to do a 12'x3' cut surface for long boards.

terrie

mcfly777
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Re: Wings only project

Postby mcfly777 » Sat Nov 12, 2016 1:48 am

Sanded, ready for CF.
2016-11-11 16.28.18.jpg
2016-11-11 16.28.09.jpg

tahoedirk
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Re: Wings only project

Postby tahoedirk » Sat Nov 12, 2016 4:33 pm

Looking good mc, I dare say that once tuned, it will likely work better than the original?!?!

plummet
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Re: Wings only project

Postby plummet » Sat Nov 12, 2016 7:42 pm

Nice.

Countersink those bolt holes bigger. When you carbon the wing you will loose some depth. Then if you recountersink to get the depth back you will loose the carbon.
Make it so the head of the bolts are below the wing surface.

mcfly777
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Re: Wings only project

Postby mcfly777 » Sun Nov 13, 2016 2:43 am

plummet wrote:Nice.

Countersink those bolt holes bigger. When you carbon the wing you will loose some depth. Then if you recountersink to get the depth back you will loose the carbon.
Make it so the head of the bolts are below the wing surface.
Yes the size of the countersinking is still something that I need to work on. The other thing, do I need to run carbon through these holes? Or can I just plug the hole when i vacuum bag it?

Leo

plummet
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Re: Wings only project

Postby plummet » Sun Nov 13, 2016 8:20 am

mcfly777 wrote:
plummet wrote:Nice.

Countersink those bolt holes bigger. When you carbon the wing you will loose some depth. Then if you recountersink to get the depth back you will loose the carbon.
Make it so the head of the bolts are below the wing surface.
Yes the size of the countersinking is still something that I need to work on. The other thing, do I need to run carbon through these holes? Or can I just plug the hole when i vacuum bag it?

Leo
I personally didn't bother. If your core is not going to soak up water the do worry.

skyte
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Re: Wings only project

Postby skyte » Tue Nov 15, 2016 8:22 pm

tkettlepoint wrote:yeah ball screws are nice but I have the rails and rack all set. I work for http://www.trackercnc.com and have access to the rails on the plasma tables for side rails. I am going to do a 12'x3' cut surface for long boards.

terrie
Perfect if you can get all the components from work! Should be a good build!
I've often thought about making a surfboard... They are pretty hard to design... advanced surfacing anyway.
Also would need a decent sized ball nose cutter to shape it reasonably quickly.


P.S. sorry for sidetracking the thread :)

skyte
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Re: Wings only project

Postby skyte » Thu Nov 24, 2016 1:13 am

[youtube]https://www.youtube.com/embed/IbrSrjhh9Gw[/youtube]

feck, how to embed a youtube vid???

https://youtu.be/IbrSrjhh9Gw

Been creating a simple simulation of a hydrofoil...
KangarooSimul8.JPG
KangarooSimul8.JPG (38.81 KiB) Viewed 1573 times
It sort of works but a lot of assumptions going on. I can change...
Foot stance
Mast Length and position
Fuselage length
Front and rear foil AoA vs coeff Lift data (this uses Eppler817 and a NACA symetrical foil)
Rate at which rider can shift weight from front to rear feet
Delay for rider to correct weight shift.
Initial AoA for front and rear wings

All i can say is that there is no correct AoA for the rear stabiliser... all the above parameters play a part in balancing the system and how stable it is. If you change one parameter you can balance the system again by tweaking other parameters.

Simulation done in Rhino and using the Grasshopper plugin.


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