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Author Topic: Recurve string liftoff  (Read 5451 times)

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Offline DC

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Recurve string liftoff
« on: February 25, 2015, 04:51:06 pm »
Just curious. Is there an ideal time for the string to lift off when drawing a recurve or does it vary with every recurve?
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Offline Springbuck

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Re: Recurve string liftoff
« Reply #1 on: February 25, 2015, 05:10:37 pm »
Varies with every recurve.  Bow length and draw length, size/diameter of curve, net angle of the recurve, limb length, bending limb length, amount of deflex if any, and width of the bow will all matter in this decision.

Basically, late enough to do some good for early draw weight, early enough to not make your limbs want to twist.
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Offline PEARL DRUMS

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Re: Recurve string liftoff
« Reply #2 on: February 25, 2015, 05:18:55 pm »
The string can't be touching the belly at full draw.
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Offline koan

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Re: Recurve string liftoff
« Reply #3 on: February 25, 2015, 05:26:20 pm »
Quote from: PEARL DRUMS on February 25, 2015, 05:18:55 pm
The string can't be touching the belly at full draw.
[/quote

....well it can...but prolly shouldnt  8)... Brian
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Offline DC

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Re: Recurve string liftoff
« Reply #4 on: February 25, 2015, 06:37:35 pm »
Quote from: PEARL DRUMS on February 25, 2015, 05:18:55 pm
The string can't be touching the belly at full draw.

So could you say that the string should lift of just before full draw, or would that be putting words in your mouth :D  I can see that any later than that would just be wasted weight on the tips.
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Offline bow101

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Re: Recurve string liftoff
« Reply #5 on: February 25, 2015, 07:19:33 pm »
Post a couple pics of brace and full draw maybe.
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Offline missilemaster

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Re: Recurve string liftoff
« Reply #6 on: February 25, 2015, 07:29:50 pm »
I would say that for a static recurve the string should lift off 3" before full draw.
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Offline DC

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Re: Recurve string liftoff
« Reply #7 on: February 25, 2015, 09:16:13 pm »
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Offline Mo_coon-catcher

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Re: Recurve string liftoff
« Reply #8 on: February 25, 2015, 10:20:07 pm »
What would be the downsides of the string not lifting off? The biggy I can think of would be the string slipping off the limb if you twist wierd at full draw. Is that a big part?

Kyle
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Offline DC

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Re: Recurve string liftoff
« Reply #9 on: February 25, 2015, 10:22:46 pm »
I would think that anything past the string contact point would not be doing anything and would just be excess weight.
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Offline Del the cat

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Re: Recurve string liftoff
« Reply #10 on: February 26, 2015, 03:53:33 am »
Quote from: DC on February 25, 2015, 10:22:46 pm
I would think that anything past the string contact point would not be doing anything and would just be excess weight.
+1
Del
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Offline PEARL DRUMS

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Re: Recurve string liftoff
« Reply #11 on: February 26, 2015, 07:23:06 am »
Short and tight statics are the only way to fly in my opinion. Big, long sweeping hooks don't do anything for me.
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Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.

Offline DC

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Re: Recurve string liftoff
« Reply #12 on: February 26, 2015, 08:00:30 pm »
Just for the halibut I did an F/D graph of the bow in the pictures. You can see where the string lifts off at 9" or 10". This must tell us something but I'm not sure what yet :D
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Offline PEARL DRUMS

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Re: Recurve string liftoff
« Reply #13 on: February 26, 2015, 08:10:46 pm »
It tells us your statics aren't near 90 degrees at start. The sharper that angle the longer the string stays in contact.
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Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize we cannot eat money.

Offline PatM

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Re: Recurve string liftoff
« Reply #14 on: February 26, 2015, 08:17:30 pm »
 At lift off the bow effectively becomes longer which causes that deflection in the graph line,
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