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Testing Chinese Tubes


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#301 zwillie

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Posted 12 April 2014 - 01:29 PM

Hi,

here one of my tapered tube sets.

TTR through TTG (not easy to do) and just for heavy ammo.

 

17939752ju.jpg

 

17939755bw.jpg

 

17939756my.jpg

 

17939757zf.jpg

 

Zwillie



#302 ruthiexxxx

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Posted 12 April 2014 - 10:45 PM

OMG Zwillie...that cannot have been easy to do !!

 

I'd love to hear more about this. Technique of insertion and performance.

 

I've only tried two types of cocktail tubes (full length).  One was Green DubDub with a natural latex inner...which is still going strong and another with 50/80s with 20/40s inside.  These were great but unfortunately the 50/80 snapped  after not very many shots so I haven't bothered again



#303 zwillie

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Posted 17 April 2014 - 11:20 AM

Hi Ruthie,

here the way I make the tapered tubes

 

http://slingshotforu...-tapered-tubes/

 

Zwillie



#304 ruthiexxxx

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Posted 18 April 2014 - 07:02 AM

Hi Ruthie,

here the way I make the tapered tubes

 

http://slingshotforu...-tapered-tubes/

 

Zwillie

 

thanks amigo...very interesting !!



#305 JJSyd

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Posted 11 May 2014 - 08:01 PM

I don't have much to contribute but I would like to say thanks.

 

I read the whole thread word for word in 1 sitting lol



#306 pgandy

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Posted 12 May 2014 - 07:42 AM

WOW!  That was some undertaking for one setting.



#307 kwinpr

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Posted 13 October 2014 - 12:42 PM

So much great info in this thread. Thanks to everyone for sharing!



#308 Kerry Cornelius

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Posted 01 December 2014 - 05:23 PM

"So, what a coincidence that our band measurements are so close."

Great minds think alike!

"What would be the best way to tie off the short loop?"

I use black waxed string that I buy from my local leather shop. It's roughly the same diameter as the cotton kite string I used to buy, but much stronger.

Now for the good news.

I did it!!!

attachicon.gifchrony-300-01.jpg

And here are the bands I used. Length of one side 6.5 inches. The loop is just long enough to fit well on the Dankung. BTW, with the amount of shooting I'm doing, the Dankung is just too uncomfortable, so all future tests will be with Mr. Stubby. I've found no difference in performance but a huge difference in comfort.

attachicon.giflooped-single-300fps.jpg

Now for some BBs.

What size tubes are you using. I would like to use your design. (Copying is the highest form of complimenting!!! LOL)



#309 Carbon

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Posted 18 December 2014 - 01:41 PM

I use a partial butterfly draw when shooting that comes out to 62in or 157cm. I also shoot 3/8" steel (and 5/8" marbles that weigh close to the same) and I'm looking for the right setup. 

I've been using 1745 tubes but they are a little too slow for my liking. I want a FAST setup, something that will turn that 3/8" steel into a penetrating projectile. But I'm a little lost because it looks like Henry's tests were done with a draw that is almost half the length of mine. Should I just scale it up? 



#310 boby

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Posted 18 December 2014 - 11:23 PM

I use a partial butterfly draw when shooting that comes out to 62in or 157cm. I also shoot 3/8" steel (and 5/8" marbles that weigh close to the same) and I'm looking for the right setup. 

I've been using 1745 tubes but they are a little too slow for my liking. I want a FAST setup, something that will turn that 3/8" steel into a penetrating projectile. But I'm a little lost because it looks like Henry's tests were done with a draw that is almost half the length of mine. Should I just scale it up? 

 

You should get Henry's take on this, but to me "scaling it up" would be to use the same stretch factor (ratio of stretched total length to unstretched total length, with same ratio of 1-tube to 2-tube section unstretched lengths). This will give you the same draw force as Henry, but the increased draw length from butterfly will increase the projectile energy by about the ratio of draw lengths, and the projectile velocity by about the square root of that number.



#311 Henry the Hermit

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Posted 19 December 2014 - 08:32 AM

 

What size tubes are you using. I would like to use your design. (Copying is the highest form of complimenting!!! LOL)

"So, what a coincidence that our band measurements are so close."

Great minds think alike!

"What would be the best way to tie off the short loop?"

I use black waxed string that I buy from my local leather shop. It's roughly the same diameter as the cotton kite string I used to buy, but much stronger.

Now for the good news.

I did it!!!

attachicon.gifchrony-300-01.jpg

And here are the bands I used. Length of one side 6.5 inches. The loop is just long enough to fit well on the Dankung. BTW, with the amount of shooting I'm doing, the Dankung is just too uncomfortable, so all future tests will be with Mr. Stubby. I've found no difference in performance but a huge difference in comfort.

attachicon.giflooped-single-300fps.jpg

Now for some BBs.

 

All these tests were made with 2040 or 1842 tubes, available from dankung.com or TrulyTexas.com Pre-made tube sets are available from some of our Vendors.



#312 Henry the Hermit

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Posted 19 December 2014 - 08:35 AM

I use a partial butterfly draw when shooting that comes out to 62in or 157cm. I also shoot 3/8" steel (and 5/8" marbles that weigh close to the same) and I'm looking for the right setup. 

I've been using 1745 tubes but they are a little too slow for my liking. I want a FAST setup, something that will turn that 3/8" steel into a penetrating projectile. But I'm a little lost because it looks like Henry's tests were done with a draw that is almost half the length of mine. Should I just scale it up? 

For 3/8 steel, 2040 will work best. Stretch the tubes as far as you can and cut them accordingly. I stretch mine to ~600%.



#313 jake64

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Posted 07 January 2015 - 06:50 PM

 

I'm short on rubber right now but could anyone confirm this

 

i was thinking this could possibly have similar speeds as the double pseudo taper tubes


Edited by jake64, 07 January 2015 - 06:54 PM.


#314 Henry the Hermit

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Posted 08 January 2015 - 05:52 AM

Looks interesting. I may give this a try and post results.



#315 jake64

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Posted 08 January 2015 - 08:50 PM

look forward to seeing the results 



#316 James Haury

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Posted 11 May 2015 - 12:09 AM

I bought some ss's and some tubes from DX today online should be here in a couple of weeks. 



#317 lunasling

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Posted 20 May 2015 - 11:04 PM

Gonna give it a go myself!

#318 lunasling

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Posted 20 May 2015 - 11:04 PM

Gonna give it a go myself!

#319 Zachary Fowler

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Posted 30 April 2016 - 08:51 PM

I like the 1745 tubes i dont know what youed call it a 1 third of it looped. I have it set up for a 58 inch draw. I call it my kyudo (samurai archary) slingshot. Its fast.




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