Post by: buckeyebowhunter on November 05, 2019, 03:31:50 PM
Been a little while since I posted but I've built a few bows in the meantime. I feel like each riser that I've done has gotten better. But my limbs seem to have plateaued as far as their performance is concerned. My main concern is that I can't seem to eliminate the "stack" at the tail end of the draw. They just don't seem to be smooth drawing limbs compared to some of the bows that I own. For example my 45# limbs seem heavier than my 48# black widow limbs. I know I'm comparing a top of the line bow to amateur limbs but I was hoping you guys may have some tricks I can try or ideas that may give me a place to start at improving the performance of the limbs.
Just some background on the bows I've been building. So far I have only built takedown recurves, and for the most part I use the bingham limb stack formulas. The limb profile of my form is also from binghams. I've mostly been using their actionwood for my limb cores, but also built a bow with elm, and walnut.
Thanks!
Post by: monterey on November 05, 2019, 04:04:15 PM
Post by: Shredd on November 05, 2019, 06:28:11 PM
Post by: buckeyebowhunter on November 05, 2019, 06:57:03 PM
Post by: buckeyebowhunter on November 05, 2019, 08:21:55 PM
Post by: buckeyebowhunter on November 05, 2019, 08:23:52 PM
Post by: buckeyebowhunter on November 05, 2019, 08:25:13 PM
Post by: buckeyebowhunter on November 05, 2019, 08:31:31 PM
17" riser, bow is about 60" unstrung and right now pulling about 46# @28. The limb stack is ULS .043, parallel .050, and taper .100
Post by: Mad Max on November 05, 2019, 09:09:15 PM
Binghams limbs are 1-3/4" or 2" wide, what one do you have?
Post by: buckeyebowhunter on November 05, 2019, 09:19:30 PM
Post by: Shredd on November 05, 2019, 09:22:02 PM
I am not a recurve guy but my first impression is your geometry might be off... Them limbs look raked back really far and the hooks appear big... A 17" riser and what appears to be 21 - 23" from fade to fade... There is very little room for the limbs to work... I could possibly see why you are stacking... Then again I am not experienced with recurves...
Did you lay your bow up against your other bows and compare their shapes??
Post by: buckeyebowhunter on November 05, 2019, 09:39:07 PM
Post by: Shredd on November 05, 2019, 09:58:51 PM
Post by: buckeyebowhunter on November 05, 2019, 10:16:34 PM
Post by: buckeyebowhunter on November 06, 2019, 07:04:18 AM
Post by: Crooked Stic on November 06, 2019, 07:14:32 AM
Post by: Shredd on November 06, 2019, 08:22:19 AM
Wedges are roughly 8" from end to fade.
No... I need to know the distance between the two fades... From fade tip to tip... As I said it looks like 21 to 23"...
Post by: Crooked Stic on November 06, 2019, 09:08:38 AM
Post by: Mad Max on November 06, 2019, 09:32:32 AM
There is enough deflex in that riser that it can get buy with a short working limb. If you built it by Bingham specs.
x2------ Could just be the design is not as smooth draw as the widow.
Riser should be 19" for the 58/60/62"
21" for the 64/66/68"
Post by: buckeyebowhunter on November 06, 2019, 10:22:36 AM
Post by: Crooked Stic on November 06, 2019, 10:32:11 AM
Post by: BO-R on November 06, 2019, 02:30:49 PM
brace went to 7 3/4 to 8in.
My finished limb width is 1.55"
On FDC, I am at 2# per inch. Max
VJ.
Post by: buckeyebowhunter on November 06, 2019, 04:17:02 PM
[ You are not allowed to view attachments ]
Post by: buckeyebowhunter on November 06, 2019, 04:17:48 PM
Post by: buckeyebowhunter on November 06, 2019, 04:19:28 PM
Post by: Shredd on November 06, 2019, 04:51:58 PM
I will do the DFC for you and post it...
Post by: jess stuart on November 06, 2019, 05:07:44 PM
Post by: Shredd on November 06, 2019, 05:10:31 PM
Post by: Shredd on November 06, 2019, 05:34:48 PM
I also have a new theory... In the 20" to 22" area you want a smooth transition... In your DFC is does not appear smooth... I call it a shelf... I have not fully proven it yet but I believe the smoother the transition the better the performance... But that is not something you really have to worry about yet... That comes down the line with fine tuning...
Post by: Shredd on November 06, 2019, 05:51:51 PM
Post by: buckeyebowhunter on November 06, 2019, 07:03:26 PM
Post by: buckeyebowhunter on November 06, 2019, 07:15:17 PM
Post by: jess stuart on November 06, 2019, 07:49:57 PM
Post by: Crooked Stic on November 06, 2019, 08:09:41 PM
Post by: buckeyebowhunter on November 06, 2019, 08:40:29 PM
Post by: monterey on November 06, 2019, 08:58:03 PM
Did you use tip wedges?
Post by: Shredd on November 06, 2019, 09:13:41 PM
You never answered my question about your other bows that you are comparing to ( black widow)... Are they the same length?? How long are they??
Post by: Crooked Stic on November 06, 2019, 09:27:28 PM
Sent from my LM-X410.F using Tapatalk
Post by: buckeyebowhunter on November 06, 2019, 09:30:14 PM
The bow I've been comparing to is my SA widow 58". 48# @ 28. The sa have a 16" riser I believe. I wish I had another take down to compare with. My only other bows are a Morrison ilf and an old bear kodiak hunter.
The old lady in bed now so the brace height pic is gonna have to wait :biglaugh:
Post by: Shredd on November 06, 2019, 09:51:39 PM
Post by: monterey on November 07, 2019, 10:57:00 AM
Here's a picture of a limb tip wedge. It's the dark line in the core.
[ You are not allowed to view attachments ]
Post by: buckeyebowhunter on November 07, 2019, 11:03:09 AM
Monterey, thanks for the explanation. The tip wedge seems a little advanced for my skill set at this point in time. But I do appreciate the explanation and tip.
Post by: monterey on November 07, 2019, 04:22:16 PM