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Thread: Limb deflection

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  1. #1
    Member deserthuntr's Avatar
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    Default Limb deflection

    Hi guys. Just a question on Martin limb deflection. I see that the CougarFC 70# must have the 5M limbs, mine has the 5L limbs? is this a problem? What is the difference between the M and L, is it only deflection?

    Will post pics soon of my first all black bow!

    Thanks and kind regards!
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    2011 Onza 3, 70# 27.75" APG camo
    2012 Cougar FC 70# 27.75" Carbon Black

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    Administrator bfisher's Avatar
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    L, M, H. Low, Medium, High. There's about 2# difference between them. If 5M limbs yield 70# then 5L would be right about 67 or 68#, but being as most bows go over the max by a pound or two then 5L might just give you 70# anyway. If it doesn't then it's simply a matter of adding a few twists to the cable(s) to bring that weight up to snuff.

    For instance, on the 2012 Nemisis I got this year with Barnesdale limbs with a 175 deflection it was supposed to be 50# peaked, but actually came through at 54.1#. Granted these were Barnesdale limbs but the application is the same with Martin limbs.
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  3. #3
    joelc
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    Limb deflection numbers are used when the bow is originally built here at the factory. These numbers change frequently due to spec changes and parts on hand. No where is it written that one bow must have a particular limb size or another.

    As mentioned above, the difference between letters is approx 2-3 lbs. For example...a 50 lb. bow from the factory could have a weight range of 48-54 lbs. If the bow calls for a "2L" limb, a 1H will hit approx. 48 lbs., a 2M will hit 52 lbs., and the 2H will hit 54 lbs. What is the correct limbs for a 50 lb. bow? All of the above.

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    Member deserthuntr's Avatar
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    Thank you, you guys have made my day! Thought the differences were much bigger.
    May the love and grace of God help us not to miss our purpose in life.
    2011 Onza 3, 70# 27.75" APG camo
    2012 Cougar FC 70# 27.75" Carbon Black

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    Default ?

    So I can have a 3m on the top and a 5m on the bottom?

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    Administrator bfisher's Avatar
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    Quote Originally Posted by coastie hunter View Post
    So I can have a 3m on the top and a 5m on the bottom?
    Not really. Both limbs must have the same deflection code. As you describe it you could end up with 10# difference between the top and bottom, creating quite an imbalance.
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