limb poundage limits

[tgself]

I have some ilf limbs that are rated at 32lbs on a 25" riser, they are currently on a 21" riser and due to the shorter riser they are pulling 36-37lbs. I just ordered an ilf longbow that has a 17" riser. My question is can I put the limbs i already have on the 17" riser or would that be too much of an increase of the pressure on the limbs for it to be safe to shoot?

[Wheels2]

Ask the manufacturer.

[McDave]

There is another variable with ILF longbow limbs that doesn't seem to be a problem with ILF recurve limbs, and that is limb pocket angle.  I've had some strange results in moving ILF longbow limbs from one riser to another where the limb pocket angles were different.  Not sure why it isn't such a problem with recurve limbs.  Maybe the limb pocket angles don't vary that much among ILF recurve risers.

[Kirkll]

As far as i know, all ILF risers have pretty much the same limb pad angle of 17-18 degrees. They do not make them different for different limb designs.  and.... one degree isn't something you wouldn't even notice. A half turn on the Limb bolt would compensate for it.   

As to the OP question:  It would depend on the limb length you are using, and your draw length. But realistically with those weight limbs i doubt there would be an issue at all with overloading the limbs unless you had short limbs drawing 32-33". There shouldn't be any saftey issue. Just draw weight and stacking point in the limbs.

.02 cents worth

Kirk

[Wheels2]

My preferred ILF riser is the Morrison Phoenix.  Each different length has a different limb pad angle so as to minimize poundage changes.
That and the captured end of the limb pocket.  If you unstring and they detent pin spring is bad or the pin is worn, the limbs don't fall to the ground.

[Kirkll]

My preferred ILF riser is the Morrison Phoenix.  Each different length has a different limb pad angle so as to minimize poundage changes.
That and the captured end of the limb pocket.  If you unstring and they detent pin spring is bad or the pin is worn, the limbs don't fall to the ground.

That’s interesting….never heard of that before. What are the different limb pad angles running at different riser lengths? 

What’s really interesting is that many archers use these adjustable limb bolts as a means to adjust draw weight, or think that is what they are for.

 What they are missing is that every different limb design has an optimal pre load at brace height for best performance. Simply saying,  that limb needs to have just the right amount of bend to it at brace height for optimum performance. Between actual string length, and adjustable limb pad angles using the bow bolts. The perfect balance can be reached.  These adjustable limbs are also excellent for balancing the tiller for different height finger placement on the string and rest height.

Each archer has different preferences. Some like shooting off the shelf with a split finger hook. Others prefer 3 under shooting style with an elevated rest. Then you have the string walkers, or shoot with a fixed crawl…. That’s where the ILF adjustment comes in real handy.

The bottom line is… different limb pad angles, and adjustment capabilities will slightly affect the draw weight, but it’s not their purpose at all.    .02 cents worth