Recent Posts

Pages: [1] 2 3 ... 10
1
Bows / Re: The best shape for a reflexed bow?
« Last post by Aussie Yeoman on Today at 02:02:57 am »
Tuomo I really dig your D/R design. Would you be willing to share the parameters here?

Quote from: Tuomo on December 12, 2025, 03:30:43 pm
Quote from: RyanY on December 11, 2025, 03:15:48 pm
I think a common issue with the R/d design versus a recurve is that they’re much harder to tiller. I assume this results in less even strain and a slower bow. Recurves are simple in comparison which may explain the difference by wood bow makers on average. I think it’s also easier to get more total reflex from a recurve than with a r/d bow. Seems like Fiberglass bows that can be designed so close to perfect are closer to what we’d see in a model versus real world averages.

Wooden laminates are easy. I make a R/D model with VirtualBow, find a correct taper rate for specific front profile. Then I make the laminates (3–4, each tapering 0.000, 0.002 or 0.004), after gluing I shape the front profile and after rounding the corners the tiller is usually very close to "perfect". For example, that 98# bamboo-horn-laminate, I made two tillering rounds, maybe 15 minutes total. Thats it.

Quote from: simk on December 11, 2025, 01:03:05 pm
to not confuse the thread we might stay a bit closer to the topic. The simple ( ;D) question actually seems: How and why does the sideprofile affect energy storage? 

Although I said that string angle isn't the best parameter to describe energy storage, it is still quite good to tell something about energy storage... Here is braced and drawn profiles of three of those models, and draw-force curves with straight reference line.
2
Bows / Re: Snake bow
« Last post by Bob Barnes on Today at 12:21:35 am »
Quote from: Selfbowman on December 12, 2025, 07:35:58 pm
Handle pic

The shape of the riser is very pleasing to the eye.  It looks like a longbow from the side profile.  I like it.   :OK
3
Bows / Re: Bow Testing 2023 / 2025
« Last post by willie on December 12, 2025, 08:44:30 pm »
Quote from: simk on December 11, 2025, 06:38:44 am
The "winning" bows were a classic 66" Longbow made from yew, maple and bamboo and a D/R glassbow which both measured same speeds.

nice test and study. can you comment on the side profiles of the top 10% of wood bows?

previous research has led me to believe that a deflexed recurve of moderate proportions.   (plus and minus 30mm or so) should be up there and hold their own against more radical bent wood designs.
4
Bows / Re: Snake bow
« Last post by Selfbowman on December 12, 2025, 07:37:03 pm »
Pic
5
Bows / Re: Snake bow
« Last post by Selfbowman on December 12, 2025, 07:35:58 pm »
Handle pic
6
Bows / Re: Snake bow
« Last post by Selfbowman on December 12, 2025, 07:33:45 pm »
Yes you can safely cut close to center . You need 1-1/2” thick handle section. And look at some glass long bow handles it’s no different except the back of the handle is flat .  A Howard hill style handle works. They are more arrow forgiving. Also opens up your sight window. One reason the target shooters like them.
7
Around the Campfire / Re: little news
« Last post by Piplasaus on December 12, 2025, 05:27:22 pm »
Congratulations to your son
8
Bows / Re: Snake bow
« Last post by Burnsie on December 12, 2025, 05:14:55 pm »
Arvin - do you typically cut your arrow shelves into your self bows that deep?
I was always lead to believe you should take just a minimal bite out of the riser then build the shelf out further with leather, wood, cork...etc.
I'd just as soon do it your way, but always thought it would be a broken bow waiting to happen.
9
Bows / Re: Bow Testing 2023 / 2025
« Last post by Tuomo on December 12, 2025, 03:48:06 pm »
Great tests, and very good wooden bows! Hopefully you will continue these in the future.

Testing different bows at the same time and with the same setup is the best and really the only way to get accurate speed measurements, because only then are the results truly comparable.

Were the wooden bows new or used?
10
Bows / Re: The best shape for a reflexed bow?
« Last post by Tuomo on December 12, 2025, 03:30:43 pm »
Quote from: RyanY on December 11, 2025, 03:15:48 pm
I think a common issue with the R/d design versus a recurve is that they’re much harder to tiller. I assume this results in less even strain and a slower bow. Recurves are simple in comparison which may explain the difference by wood bow makers on average. I think it’s also easier to get more total reflex from a recurve than with a r/d bow. Seems like Fiberglass bows that can be designed so close to perfect are closer to what we’d see in a model versus real world averages.

Wooden laminates are easy. I make a R/D model with VirtualBow, find a correct taper rate for specific front profile. Then I make the laminates (3–4, each tapering 0.000, 0.002 or 0.004), after gluing I shape the front profile and after rounding the corners the tiller is usually very close to "perfect". For example, that 98# bamboo-horn-laminate, I made two tillering rounds, maybe 15 minutes total. Thats it.

Quote from: simk on December 11, 2025, 01:03:05 pm
to not confuse the thread we might stay a bit closer to the topic. The simple ( ;D) question actually seems: How and why does the sideprofile affect energy storage? 

Although I said that string angle isn't the best parameter to describe energy storage, it is still quite good to tell something about energy storage... Here is braced and drawn profiles of three of those models, and draw-force curves with straight reference line.
Pages: [1] 2 3 ... 10