"Two comments:
On using metal covering over rapid prototype core. That is a useful technique. I've used it as a way to make master plugs for an air intake assembly. We made carbon molds off the chromed plastic plugs then heat treated…"
Oliver's Discussions
How strong do UAV wings need to be?
Started this discussion. Last reply by Ehren Feb 23. 4 Replies 0 Likes
How do you approximate airfame weight?
Started this discussion. Last reply by A Heaton Feb 9. 1 Reply 0 Likes
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Oliver replied to Oliver's discussion How strong do UAV wings need to be?"Doh!
Just realised I got the calc for the g load wrong it should:
7x6x9.81 divided by 2 (for half the wing ) = 206 N or 21 Kg
This a much more achievable figure for my plastic/metal wing
Ollie
"
Oliver replied to Oliver's discussion How strong do UAV wings need to be?"Hi Ehren,
Thanks for your reply. I am trying to make an airframe for a UAV using plastic parts coated in a thin nickel alloy. The plastic parts are upto 10 times stronger and stiffer when coated.
I decided to design the wing as a load bearing…"
Ehren replied to Oliver's discussion How strong do UAV wings need to be?"I use simple rules:
30% of material strength at 10g loading on all three axis
Simple fast easy math good baseline.
We have reduced weight (minimullay) by going to 30% at 6g; however we developed fatigue cracks in certain areas.
So there is no…"
Oliver posted a discussionHow strong do UAV wings need to be?
Hi Guys, I was reading a spec for a commercial UAV and it stated that the design was capable of +/- 6G. I also noted that some catapault launchers generate a 15G load on launching. Does anybody have an idea of the kind of G forces you see in hobby UAV flying? I was wondering what kind of loads the foam wings could take. Do you think a 6G loading on the wings necessitates making wings from carbon fibre or similar? Ollie See More
Oliver replied to Oliver's discussion NEW MATERIALS FOR UAV'S"Hi there,
I have seen the Southampton UAV its great and kudos to them for doing it, but I want to develop stiffer and stronger materials. Iam looking at using high temp resistant, engineering plastics which when coated are up to 10 times…"
A Heaton replied to Oliver's discussion NEW MATERIALS FOR UAV'S"Shouthampton University have been looking into this sort of thing. They have flow a UAV that has been made on a 3D printer:
http://www.youtube.com/watch?v=JsD7qo7X3eU"
A Heaton replied to Oliver's discussion How do you approximate airfame weight?"If you can get a hold of "Airplane Design Part I - Preliminary Sizing of Airplanes" by Roskam there is an equation in there which you could use to get the empty weight form the take-off weight, if you get some regression coefficients from…"
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