Ok, I'm no expert but I have been fooling around with ILF stuff for a while now. Just got a set of Zipper Z4 limbs marked 46# @ 29", just my specs. Not sure what length riser that was from. Put them on a 17" Zipper ILF riser and they are at the lowest 49# @ 29", put them on a Dryad 19" riser and thet are even heavier, put them on a 15" Morrison and they felt perfect......WHY????? Would it be the limb pad angle??? Any help or thoughts I will be thankful for......    

Just checked the poundage on the 15" Morrison and it was 49# @ 29"......but it feels a bit lighter.

I'm no expert, but ILF is standard on the limb attachment system, but not the limb pad angle.  I believe the the Dryad website says that their risers produce a +8# limb formula.

Yep, but I believe that's on a limb rated on a 25" riser. Shorter riser, more poundage. I just re set up my 17" Zipper, re did the tiller to a 1/8" positive and backed the bolts all the way out. I got 47# @ 29" , only 1 pound heavy. I guess I'm ok.

Yes, most are rated on longer riser so shorter means more weight

Yes, the limb pad angles do vary, even from the same maker across different length risers.  Most weights for olympic limbs are expressed for 25-inch risers. Many others mark their"hunting" limb weights for 19-inch risers, some 17-inch.  

Really isn't much standardization.  The result is that it's often difficult to know what a set of limbs will weigh on the riser one has until you mount them and weigh them on a scale.

Sometimes you can call the limb manufacturer and ask their experience with different risers. Nothing but the limb attachment is standardized.

I just sent Bill Dunn a message to get the facts right from the maker.

It's all about limb pad angles

QuoteOriginally posted by Cwilder:
It's all about limb pad angles

Christian and others stated it perfectly.  One of the most frustrating things to me is how its a "universal fitting", but it doesn't specify anyone else.  

I called several different individuals to figure this out.  I had a dryad and a zipper riser when I first got into it, I put the limbs on the two different risers and had 2 totally different bows, with the same limbs.  It didn't make sense.  I then got a Morrison and had another totally different bow.  I liked the morrison the most (no offense to the others) and kept it.  My limbs were also morrison, so i'm sure that played a big factor.

Yep, limb pad angles, riser length, length of riser limb rated on, amount the bolts are turned in and brace height all come into play. On top of that some makers rate there limbs at different limb bolt position; all in, all out or even in the middle.

Only standard as I see it is the fitting, and even there the DAS connection exists, jeez. One better know what your doing with ILF tuning to get the most out of your setup.

Morrison varies his limb pad angles to compensate for riser length.
So a 15" Morrison yields the same poundage as longer Morrison risers.
I like the IL risers but wish a limb pad angle would be standardized.  Same for limb poundage...
not some measured on a 17" riser and others a 25" riser.

I guess if you want simple, go with bolt-down technology.  ILF comes with some math involved.
It's pretty easy if your a 25" riser shooter where most of the products are produced.  But even there the riser will differ a few pounds with the same limbs.

In the short riser arena it's a bit of a crap shoot.  Most bowyers can tell you that if you put a limb rated at 25" on there riser then it will gain X pounds.  It gets further complicated when you build limbs for your own riser.

We try to stay pretty standard with our ILF risers and limbs.  It becomes problematic when people buy used and instead of talking to the riser manufacture they listen to keyboard experts on the internet.

I do know that ours and Bob Morrison's risers have about the same effect on  limb poundage and that we both modify the riser configuration to maintain limb poundage.  Our only exception is the 13" that gains a couple of extra pounds.

Mike

Mike

Thanks Mike........  

QuoteOriginally posted by wingnut:
I guess if you want simple, go with bolt-down technology.  ILF comes with some math involved.
It's pretty easy if your a 25" riser shooter where most of the products are produced.  But even there the riser will differ a few pounds with the same limbs.

In the short riser arena it's a bit of a crap shoot.  Most bowyers can tell you that if you put a limb rated at 25" on there riser then it will gain X pounds.  It gets further complicated when you build limbs for your own riser.

We try to stay pretty standard with our ILF risers and limbs.  It becomes problematic when people buy used and instead of talking to the riser manufacture they listen to keyboard experts on the internet.

I do know that ours and Bob Morrison's risers have about the same effect on  limb poundage and that we both modify the riser configuration to maintain limb poundage.  Our only exception is the 13" that gains a couple of extra pounds.

Mike

Mike

If someone were setting up a dedicated 25in target rig which riser would you recommend for your limbs mike?

For our ACS RCT and Epic RC limbs pretty much any of the  25s will do well.  The CD WFX 25 is the best in my opinion.

Mike