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Author Topic: Carbon vs. Wood  (Read 489 times)
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Roger
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« on: September 10, 2017, 09:48 PM »

I have been building some cellular kites using 1/4" wood dowels, most around 2 ft. long. My questions are what diameter carbon rod/tube would give similar strength and stiffness as my wood, and how would a similar performing carbon strut compare in weight and cost? (A 2 ft. 1/4" dowel weighs ~8.3gm & costs ~50 cents.) Thanks.  Smiley
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thief
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« Reply #1 on: September 11, 2017, 06:46 AM »

Mr. Chilese used to have a chart that showed spar materials, strength and deflection...maybe he can pull it back up for you.
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Allen Carter
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« Reply #2 on: September 11, 2017, 01:13 PM »

All the charts I've seen compare FG and carbon, but not wood. 

HMmmm...

Maybe Rec.kites?
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Allen, AKA kitehead
Allen Carter
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« Reply #3 on: September 11, 2017, 02:37 PM »

https://books.google.com/books?id=buvtiiXX4lMC&pg=PA58&lpg=PA58&dq=stiffness+and+weight+of+kite+spars&source=bl&ots=Jm9WJvAwZE&sig=WTQrm4eY0QseR6HWgi-rndUDuMo&hl=en&sa=X&ved=0ahUKEwiyreKLi57WAhXFy1QKHVrUC_gQ6AEISTAG#v=onepage&q=stiffness%20and%20weight%20of%20kite%20spars&f=false
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Allen, AKA kitehead
Roger
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« Reply #4 on: September 11, 2017, 09:33 PM »

Thanks all!

Interesting resource! Had to look up 'ramin' dowel; you too?

What I am trying to get at is if I can get the same stiffness & strength I have with the wood, with a smaller diameter and lighter material. I'm pretty sure wood can't be beat for price and I have only broken sticks when assembling. 'Course I haven't had the kites out in a gale yet but I am eager.

I notice the book writers criticize wood as 'prone to warping after extended use especially under humid conditions...' to which I reply 'paint & replace'. Cheesy

A word on wooden dowels that I have found in the last couple months. The best I found -and bought out- were Poplar dowels at Lowes. Best as in fewer searched through for straights, consistent diameter, good stiffness. Having bought out Lowes I got some at Fred Meyer which were inconsistent in diameter and mostly crooked. Then to Home Depot where the dowels were unspecified wood made in Vietnam (ramin dowels perchance?) and they were uneven in diameter, splintery, and crooked.

Time to check back at Lowes for the new shipment. Happy sparring!
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Allen Carter
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« Reply #5 on: September 13, 2017, 09:52 PM »

I forgot that Mike's chart had wood:

https://www.sysmatrix.net/~mikenchico/Spar_Deflection.htm
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Roger
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« Reply #6 on: September 15, 2017, 10:32 AM »


Thanks Allen. Added to my bag. Smiley
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browndude3649
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« Reply #7 on: September 16, 2017, 06:32 AM »

Don't forget the s'more s bamboo sticks and other BBQ skewers are on sale at ur local supermarkets since summer is over with. 
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Roger
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« Reply #8 on: Yesterday at 12:32 PM »

Don't forget the s'more s bamboo sticks and other BBQ skewers are on sale at ur local supermarkets since summer is over with. 


I had no idea what you were talking about until I saw some of these at the market yesterday. In end of summer basket no less!  Cheesy It was a pack of 4 sticks which looked straight, about 3/16" x 30". Didn't get them as couldn't find price and I am working with 1/4".

I did track down the manufacturer of the Poplar dowels I have been getting from Lowes; it's Madison Mill, Inc. in Ashland City, Tennessee. Looks like they are primarily a wholesaler but will take minimum orders of $500.   Sad 'Atsa lot o' sticks!  Huh
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