Main Discussion Area > Bows
How far, how fast?
superdav95:
Add me to this list. I’d love this information from sleek!
sleek:
--- Quote from: Zugul on July 01, 2024, 08:00:54 am ---
--- Quote from: sleek on July 01, 2024, 03:27:04 am ---A bow with no set starts with a bow of the proper dimensions. I've got a formula that will tell you the exact draw weight a bow will take before taking set based on the wood type and dimensions. If you tell me the dimensions, I'd be happy to tell you the draw weight that bow will handle before it takes more than 3/8 inch set.
Disclaimer: ( of course there is one ) I've been working on this formula for YEARS and it works perfectly on osage. I've dabbled with it in other wood types but have not proven it yet with other woods. It seems to hold true and I'm looking for other woods to try this formula on. If you are willing to give it a go, I'll run the numbers for you.
--- End quote ---
is this an invite for anyone or just for the thread's author? because I'd love to send you some measurments ;D
--- End quote ---
I dont want to get over run with bows to calculate but I am happy to do one for some folks. I just don't want anyone to feel left out if I don't get back to them quickly. But for these next few days, I have time. Post your bows stats here and I'll run them to see what they should weigh to prevent excessive set.
I need the dimensions of the bow.
Total length
Length of all non bending parts, tips and handle
Width profile of all bending parts starting from the fades towards the tips.
Example:
Wood type: Balsa
Nock to nock 62 inches
8 inch handle
6 inch stiff tips
1.5 inches wide at the fade for 3 inches past the fade
1.25 inches wide at 4 inches past the fade
Even taper to .5 inches wide 18 inches from fade
6 inch Stiff tips after 18 inches
There aren't real bow stats but an example of what I need to plot the bow out. Give me enough detail I can make a bow at home exactly like yours.
I dont need draw length, that has nothing to do with set.
My inbox stays full so just post the information here
Again, I want to stress, this is something I'm very confident in with osage. I've designed and built world record shooting bows with this formula. But I haven't done much at all with any wood outside osage so this is experimental with all other woods. But, it should work. Be prepared to be surprised at how underbuilt most bows really are.
Zugul:
well, I'm not wasting this opportunity!
Wood type: Black locust
bendy handle bow
Nock to nock 62 inches
4 inch handle section, bending (2" above and below geometrycal centre of the bow)
3.4 inch stiff tips
1.3 inches wide in the handle section
Even taper to .67 inches wide 25.67 inches from fade
3.4 inch stiff tips after 25.67 inches
thanks! I hope to not be too far off :BB
sleek:
--- Quote from: Zugul on July 02, 2024, 08:13:54 am ---well, I'm not wasting this opportunity!
Wood type: Black locust
bendy handle bow
Nock to nock 62 inches
4 inch handle section, bending (2" above and below geometrycal centre of the bow)
3.4 inch stiff tips
1.3 inches wide in the handle section
Even taper to .67 inches wide 25.67 inches from fade
3.4 inch stiff tips after 25.67 inches
thanks! I hope to not be too far off :BB
--- End quote ---
Ok, running my numbers, your bow should be 34 pounds to take virtually no set. Now that I've calculated that, what is your draw weight, and what is your set? Also, just for further information, did you have any reflex, and did you heat treat the bow? That isn't calculated yet, but I'm not certain it needs to be yet either.
Zugul:
that's PERFECT! keep in mind I'm still working on that bow but my goal weight is 35# at 28". At the moment I'm long string tillering it and it is around 35# at 4" so not even close to full draw. It has around 0.8" of reflex, it's not heat treated but I used dry heat to straighten it in a cuple of spots. For now it's not taken any set (the reflex is the same I had from the start). Now let's hope I don't mess up the tillering process, if the bow survives my very untrained eye and doesn't fret I'll let you know if and how much set it took.
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