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Recent posts by: avcase

Showing Results 1 to 20 of 20 (0.031 secs)

Last Indexed: 09/02/14 4:07 AM
Last Post: 09/02/14 4:07 AM

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Topic Title Forum Author
Re: field (machine) tests (reply)
I would like to get some breaking strength and stiffness data on tennis racket gut if anyone is able to measure it. The string strength exceeded my current equipment, but I expect that it is unlikely that the strength to weight ratio of...
Primitive Flight Shooting

avcase

08/14/14 9:55 PM
Re: One shot one arrow drawlength?? (reply)
I think Rod's draw length proposal would add a unique element to the ELB regular flight division. There would be no need for a minimum bow or arrow length because those dimensions would be driven by the draw style requirements,...
Primitive Flight Shooting

avcase

07/09/14 10:34 PM
Re: Setting up a field bow recurve (reply)
The Field Bow division would resemble the type of equipment commonly used in 3D competitions (non-compound). There is no limit on the type of materials used for the bows, strings or arrows. Glass and carbon fiber composite limbs...
Primitive Flight Shooting

avcase

06/07/14 1:09 PM
Re: Setting up a field bow recurve (reply)
Is it OK to answer since the Field bow division isn't primitive? This is how I would approach it: Use the minimum length bow, which is 52", and use short limbs. I would go for a short draw (perhaps 20-21"?), and the thinnest all-carbon...
Primitive Flight Shooting

avcase

06/07/14 12:42 AM
Re: field (machine) tests (reply)
Adam, Thanks for fixing that for me. I have a lot of distractions and didn't realize I had posted to the wrong thread. Haha! Alan
Primitive Flight Shooting

avcase

06/02/14 9:45 PM
Re: weakest point of the bow/arrow- system (reply)
Adam, Is there still a plan to have one of these bows sent to the US Flight Championships at the end of August? Small improvements to arrows, tuning, and release really start to make a big impact with bows that are already crowding the...
Primitive Flight Shooting

avcase

05/30/14 8:01 PM
Re: weakest point of the bow/arrow- system (reply)
I find that arrow speed is often not the limit I struggle with the most. The major weak link for me is figuring out how to rapidly achieve clean repeatable arrow flight. I try to make the bow easy to tune and organize my arrows so I...
Primitive Flight Shooting

avcase

05/02/14 5:48 AM
Re: One shot one arrow drawlength?? (reply)
Neither the American Longbow and English longbow divisions have a minimum arrow length restriction, so it falls to the 14" default minimum length. I feel it was a bit of an oversight in the rules. I'm sure the authors of the rules...
Primitive Flight Shooting

avcase

04/26/14 6:02 PM
Re: Far out arrow topic (reply)
There are some very good sources out there about aerodynamics of rockets which are applicable to arrows. For example: http://sargrocket.org/Documents/Estes/TR-11.pdf
Primitive Flight Shooting

avcase

03/07/14 6:04 PM
Re: Far out arrow topic (reply)
This is how I mentally picture what will happen. The softened shape will compress where the pressure is highest. This highest pressure area is right at the center of the nose of the arrow, pushing it rearward. As the arrow does this, it...
Primitive Flight Shooting

avcase

02/21/14 6:20 AM
Re: Allen and Woodbear (reply)
I have the impression that the hysteresis in a material starts to rapidly increase as the strain approach the yield point. Wood and composites don't have a sharply defined yield point like steel, but it seems to suddenly jump up rapidly...
Primitive Flight Shooting

avcase

02/19/14 1:39 AM
Re: Allen and Woodbear (reply)
Given that the strain is the same for both cases, my guess is that the hysteresis would be about the same. But, I am far from an expert on this and others have done a lot more research into it. Alan
Primitive Flight Shooting

avcase

02/18/14 3:00 AM
Re: spine? (reply)
I was measuring some of my wood/non-bamboo flight arrows. I find it interesting that the primitive flight rules single out forge wood shafts in the rules. Given a minimum 23" arrow length, they are not competitive. They are either too...
Primitive Flight Shooting

avcase

02/03/14 11:47 PM
Re: spine? (reply)
They are called hex-shaft arrows. -Alan
Primitive Flight Shooting

avcase

02/03/14 12:49 AM
Re: The Vorderheubronn flight arrow massacre (reply)
Michael, I really like this bow! How heavy is the arrow for the very high speed chrono results? What are your plans for it? You can save some broken arrows by using a carbon arrow of the same mass for the chrono shots. Alan
Primitive Flight Shooting

avcase

01/09/14 11:03 PM
Re: 2011 Tonkin Cane Composite Flight Bow (reply)
Dan, That jig for shaping bamboo strips is pretty cool! It is probably worth taking some time to check out the fly-rod builders since we share so much in common: adhesives, heat treating, maximum stiffness for minimum weight,...
Primitive Flight Shooting

avcase

12/05/13 12:06 AM
Re: 2011 Tonkin Cane Composite Flight Bow (reply)
Steve, You are extremely generous and bring a ton of fun and energy to the sport. You have me thinking about my archery "bucket list". I am sure it is an oversight, but I don't see a prohibition against using a foot-held bow in the...
Primitive Flight Shooting

avcase

12/04/13 11:05 PM
Re: 2011 Tonkin Cane Composite Flight Bow (reply)
Dan, I took some pictures during the building process and will look for them. I'll share some lessons learned. If I were to do it over, I would choose a more conventional looking handle with an simpler glued on overdraw instead of a...
Primitive Flight Shooting

avcase

12/03/13 7:57 PM
Re: 2011 Tonkin Cane Composite Flight Bow (reply)
Dan, I will share how I made this bow. It was an exercise in patience for sure and I certainly haven't given it the kind of sustained effort to fully explore the potential. I started with dozens of bamboo splits, similar to what I use...
Primitive Flight Shooting

avcase

11/25/13 4:36 AM
Re: Linen for your bow strings! (reply)
I have some rolls of linen that may be "latexed". The thread appears incredibly smooth and tight with no fuzz. At first glance, I thought it must be the best ever. But after measuring break strength and string mass, I found that the...
Primitive Flight Shooting

avcase

11/20/13 6:31 PM
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