Post by: rmorris on March 23, 2024, 02:10:23 PM
Found some nice looking diamond wood at the local big box store, just too bad I had to glue 3 pieces together to get it thick enough.
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I will try any post some pictures as I get this new design figured out but I think the last time I posted a picture on here the entire user interface was different!
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Post by: Kirkll on March 23, 2024, 07:59:16 PM
Looks like plywood to me…. :o :o :o :o Hopefully you are going real light weight on this… that looks scary to me…. Kirk
Post by: rmorris on March 23, 2024, 09:07:23 PM
Post by: rmorris on March 24, 2024, 08:34:09 PM
After playing around with an older broken recurve I was given several years ago as I am somewhat modeling this now after that one. I noticed my limb pad angles were a bit off.
Looks like I should be somewhere closer to 17 deg. Don’t judge me but I think I am going to try and reverse glue the cutoffs back on and try this again!
Post by: Roy from Pa on March 25, 2024, 09:49:24 AM
Post by: rmorris on March 25, 2024, 09:43:09 PM
Got my scrap pieces glued back on and recut to the new angle. I think I am about out of things to do and may have to dive into making this bow.
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Post by: Roy from Pa on March 26, 2024, 03:46:01 PM
:thumbsup: :thumbsup:
Post by: dbeaver on March 27, 2024, 12:07:49 PM
Post by: Kirkll on March 27, 2024, 12:27:57 PM
Without having an adjustable riser, I can see doing a mock up. But I would be very careful actually using threaded inserts in a plywood riser and actually loading up a set of 50# + limbs. I’m not sure it would hold up.
I think I would use red oak you can buy pretty cheap at the big box store for mock up risers when actually stringing up your limbs, and use limb pad wedges to adjust preload. That oak will be much stronger and safer on the tiller tree.
.02 cents worth.
Post by: rmorris on March 27, 2024, 01:54:02 PM
The one part I can’t prototype is the limb thickness on the first attempt. I am shooting for 35#@22” for a 62” recurve with an 18” riser.
I am going to shoot for .200 stack just after the riser wedge and that will be with a .002/“ taper using .04 glass and approx 1.6” wide limbs.
If anyone has any better suggestions on that stack thickness please let me know.. I will send the closest guess a nice piece of “diamond wood”!
Post by: Noah70 on March 27, 2024, 05:11:17 PM
I’ll donate that diamondwood to a worthy cause. :goldtooth:
Post by: rmorris on March 27, 2024, 09:44:07 PM
You saved me and made me do some thinking and re - measuring tonight when you said 50#@28 and I thought no way my 11 years could pull that!
The correct weight is 30#@28 or closer to 18#@22”. Now I am thinking .200 is too much now.
Appreciate the help!
Post by: Kirkll on March 28, 2024, 12:23:12 AM
You can use stable core right under the glass on the back of the bow, or a bias weave carbon will work even better. The last ultra light I built I used .015 twill carbon over stable core on the back for a total of .031 composite backing.and the stability rivaled a 65# bow.
If you are just using .040 glass, I’d recommend no forward taper in the limbs at all, or even a reverse taper for a 30@28” set up…. Once you drop below . .185 - 190 limb thickness at the base of the curl, they start getting squirrelly on you and are very touchy and a perfect alignment is critical ….. food for thought….
You know…. I’ve never tried .050 glass on a light weight recurve. That may in fact give you better stability, but it’s awful heavy on such light limbs… just a thought…
Kirk
Post by: Jon Lipovac on March 28, 2024, 03:03:56 PM
Kirk , where did you get the .015 Twill and what did it cost?
Post by: rmorris on March 28, 2024, 03:48:43 PM
I appreciate all the help I can get on this as this is targeted to be my first successful recurve. I will be going with your advice and getting rid of the taper and will also be looking into the .015 twill. Going to try the first one without it as once I get a weight for this design I should be able to calculate stack fairly easily going forward and that is where I will be interested in the twill.
As always appreciate everyone’s help and will try to post if I make any progress over the long weekend.
Post by: Kirkll on March 28, 2024, 11:55:48 PM
Don’t mean to sidetrack this thread.
Kirk , where did you get the .015 Twill and what did it cost?
it comes from China... i'd have to do some digging to find the contact, its been awhile since i bought some. Crooked Stik found him on Face book.. he may have the contact info handy. i''l have to look.
but it was reasonably priced..... it's not the best looking carbon weave i've used, but it sure does the job on stability. Kirk
Post by: Mad Max on March 29, 2024, 07:13:31 AM
Post by: Jon Lipovac on March 29, 2024, 07:45:41 AM
Chatting with him now.
Post by: Mad Max on March 29, 2024, 08:10:34 AM
Post by: rmorris on March 29, 2024, 09:35:06 PM
I got a little work done today of the new bow. It will be canary wood for the back and belly of the riser and black limba for the center section. I am going to do blood wood/ Osage and maple mosaic with padauk and maple accent strips.
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I was able to cut enough padauk out of that 3/4 in board to get enough strips for the accent strips and laminations in the limbs. I have used padauk in several long bow limbs and it works well with the exception of all the grain filling you have to do.
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Post by: Mad Max on March 30, 2024, 08:16:38 AM
Kirk,
I appreciate all the help I can get on this as this is targeted to be my first successful recurve. I will be going with your advice and getting rid of the taper and will also be looking into the .015 twill. Going to try the first one without it as once I get a weight for this design I should be able to calculate stack fairly easily going forward and that is where I will be interested in the twill.
As always appreciate everyone’s help and will try to post if I make any progress over the long weekend.
This Excel file is very accurate, I can email to you if you want if you have excel :thumbsup:
One of out Trad Gangers made it. :thumbsup:
(https://i.imgur.com/pEdFIoq.jpg)
Post by: SDB on March 30, 2024, 04:02:30 PM
Post by: Kirkll on March 30, 2024, 10:47:31 PM