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Old Aug 16, 2012, 11:41 AM
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Tom.in.Maryland's Avatar
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Carbon fiber archery "arrows" shaft question

Has anyone tried using carbon fiber arrow shafts as fuse extension from wing back to tail?

Is this worth persuing or is the just simply a better way.

Thanks, Tom
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Old Aug 16, 2012, 11:53 AM
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Tom:

I built no less than five, hand-launch gliders to a design from the Charles River Soaring Club, back in 2000-2002.

Carbon fiber arrow shafts were specified as a boom, and they worked fine. They cut easily with a razor saw (I wrapped them in masking tape to prevent splinters). I built balsa sheet fuselage pods, and inserted the arrow-shaft booms into holes in the bulkheads. CA held things together very well. This particular desing used a V-tail made of sheet balsa, and CA did well at that end, too. I used hollow shafts, and ran the push rods through the shafts.

At an archery shop, shafts are sold on the basis of both weight and stiffness, and they are very uniform. I still have the remnants.

I would not myself use an arrow shaft for an airplane larger than about 60-inch span. Bigger than that, and there might be problems with torsion.

Yours, Greg
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Old Aug 16, 2012, 11:56 AM
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Quote:
Originally Posted by glidermang View Post
Tom:

I built no less than five, hand-launch gliders to a design from the Charles River Soaring Club, back in 2000-2002.

Carbon fiber arrow shafts were specified as a boom, and they worked fine. They cut easily with a razor saw (I wrapped them in masking tape to prevent splinters). I built balsa sheet fuselage pods, and inserted the arrow-shaft booms into holes in the bulkheads. CA held things together very well. This particular desing used a V-tail made of sheet balsa, and CA did well at that end, too. I used hollow shafts, and ran the push rods through the shafts.

At an archery shop, shafts are sold on the basis of both weight and stiffness, and they are very uniform. I still have the remnants.

I would not myself use an arrow shaft for an airplane larger than about 60-inch span. Bigger than that, and there might be problems with torsion.

Yours, Greg
Thank you for your response, I am working with 2meter gliders.
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Old Aug 16, 2012, 02:15 PM
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You would want to use something larger in diameter than an arrow shaft for aa tail boom on a 2m. I once used a pool cue as a mandrell and made a nice tapered boom for a scratch built 2Vix2 2m right out of RCM@E magazine. It flew great too. BTW you guy's should wait till bow hunting season is over as Wal-mart deeply discount's their carbon arrow shaft's then. My arrow shaft's do double duty as fuse stiffener's and tail control guide's.
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Old Aug 16, 2012, 02:35 PM
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Two sources for carbon booms, stiff enough for you:

http://www.mountainmodels.com/produc...products_id=40

or http://www.goodwinds.com/merch/list.....wrappedcarbon

The G force tappered tubing, for Allegro or B-Dancer

I have used a lot of arrow shafts but for nothing over about 40"

Good luck and enjoy the build!
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Old Aug 16, 2012, 03:10 PM
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Depending on the stiffness and how hard you throw, an arrow shaft may not be stiff enough even for a 60 inch glider.

For a 2 meter, part of a broken carbon fiber fish pole may be an option.
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Old Aug 16, 2012, 03:15 PM
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Tom:

I was reminded that carbon golf club shafts have occasionally been used as booms. I have no experience with those myself, though.

Yours, Greg McGill
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Old Aug 16, 2012, 03:19 PM
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Quote:
Originally Posted by glidermang View Post
I was reminded that carbon golf club shafts have occasionally been used as booms. I have no experience with those myself, though.
Carbon golf shafts can work, but they're heavier than necessary and the stiffness distribution is backwards (golf shafts are stiffest at the skinny end).
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Old Aug 16, 2012, 03:34 PM
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I've used fishing rod blanks on occassion, you can pick up a pole or whip (no eyes) fairly cheaply and get a variety of tapered blanks within that. The butt sections especially, are designed to be very stiff and light, and are probably higher quality material than anything specifically for models.
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Old Aug 16, 2012, 03:46 PM
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Used them 20 years ago for HLG's etc. Nothing bigger, but worked great for them.

Marc
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Old Aug 18, 2012, 10:16 PM
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one of the guys gave a go at a 2m scratch fuse with an arrow shaft boom. It works but its a bit wobbly for my taste. Fishing pole is my best guess, use the fatter end.
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Old Aug 19, 2012, 06:56 AM
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Hi have used alloy easton arrow shafts and FG arrow shafts for a couple of hybrid slopers, I woudn't go over 1.5m wingspan with them but then, if it is a slow sailplane then not so much worry but it'll do your servos little good with the shaft flex.

Fishing rod is the better option I agree with the other guys, so many types to choose from plenty of 2nd hand ones about too you should find the perfect shaft somewhere, just base your selection on common sense and the compromise between weight, size and rigidity, and all could be well.
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Old Aug 19, 2012, 04:08 PM
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Buy a piece that was designed to do the job you are asking of it. The Allegro, Bubble dancer suppliers have what you need. Golf club and fishing poles are designed to bend although in a controlled way. They are also heavier than a comparable unit designed to be a tail boom. Arrow shaft is straight tubing. To skinny in the front and to fat at the rear. And again to heavy.
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Old Aug 19, 2012, 04:26 PM
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I've used carbon arrows on two different designs. Both were 2 meter planes. The first one I used a single shaft with a "T"-tail back end and found that the single shaft was waaaaayyy to flexible for the application. On the second I used 3 shafts that i joined together. While it was plenty stiff enough for the application, it weighed a lot and required a ton of lead to bring it into balance.

Your best bet is to use something that is designed for the application/design.
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