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General control line discussion => Open Forum => Topic started by: Motorman on August 23, 2015, 09:50:07 PM

Title: CF Pushrod Wall Thickness
Post by: Motorman on August 23, 2015, 09:50:07 PM

I found some CF arrows at Walmart and brought one home. it has an OD of 5/16" and a wall thickness of .025". Would this be strong enough for say a Vector 40 size plane? They do seem to have a little more flex than I thought they would but, still better than wire. Just worried about failure.

Thanks,
MM

Title: Re: CF Pushrod Wall Thickness
Post by: Curare on August 23, 2015, 09:58:45 PM

Are you sure they're carbon and not black fibreglass?

I've used Easton carbon arrow shafts before, but they were 8.1 grains per inch. These were the toughest I could buy, and even then I think they're a little bit flexy.

Title: Re: CF Pushrod Wall Thickness
Post by: Tim Wescott on August 23, 2015, 10:20:28 PM

The arrow shafts that I have that are that size would certainly work -- but I'm pretty sure mine are, indeed, carbon.

Do they say they're made out of CF, or are they just black and made out of something fibrous?

Title: Re: CF Pushrod Wall Thickness
Post by: David_Stack on August 24, 2015, 06:36:34 AM

Arrow shaft 'spine'...

Good Morning,

  Arrow shafts are sized/selected based on a numeric value indicative of their 'spine'.  The challenge is that while there is an industry standard (as developed by Easton archery) not all of the arrow shaft manufacturers us it to boldly label their arrow shafts.  In archery, spine = the amount of shaft deflection when a set weight (1.94 lb) is suspended from the mid-point of the shaft, with the shaft resting on two supports spaced 28" apart.  A 500 spine arrow would have a deflection of 0.500" when tested using the criteria mentioned, a 350 spine arrow would deflect 0.350", and so on.

  For our use, you are obviously going to want to select the lowest spine (shaft most resistant to bending) which you can find...

r/
Dave

Title: Re: CF Pushrod Wall Thickness
Post by: Jim Roselle on August 24, 2015, 07:57:33 AM

Or you can do this, best 6.95 you'll ever spend.

http://stunthanger.com/hobby/product_info.php?products_id=312

Title: Re: CF Pushrod Wall Thickness
Post by: Bill Johnson on August 24, 2015, 09:26:25 AM

Quote from: Jim Roselle on August 24, 2015, 07:57:33 AM

Or you can do this, best 6.95 you'll ever spend.

http://stunthanger.com/hobby/product_info.php?products_id=312

I guess you specify the length when you order? If so, that is a deal. I can't buy the parts for that much!

Title: Re: CF Pushrod Wall Thickness
Post by: Jim Roselle on August 24, 2015, 09:53:53 AM

Quote from: Bill Johnson on August 24, 2015, 09:26:25 AM

I guess you specify the length when you order? If so, that is a deal. I can't buy the parts for that much!

Yep, I ordered one last Monday and it arrived Friday.

Title: Re: CF Pushrod Wall Thickness
Post by: Motorman on August 24, 2015, 10:58:05 PM

Well saw it in half and see how thick it is.


Thanks,
MM

Title: Re: CF Pushrod Wall Thickness
Post by: Al Ferraro on August 26, 2015, 09:19:54 AM

 This might be helpful.
http://www.darrolcady.com/Carbon_Fiber/carbon_fiber.htm

Title: Re: CF Pushrod Wall Thickness
Post by: Bill Johnson on August 27, 2015, 06:53:09 AM

Quote from: Al Ferraro on August 26, 2015, 09:19:54 AM

This might be helpful.
http://www.darrolcady.com/Carbon_Fiber/carbon_fiber.htm

Thanks for the link, Al. I like the 3/16" rod that takes all-thread. Much cheaper then the rods and titanium fittings from the LHS.