The picture below shows some fancy wings that I’ve added to protect the inboard side of the limb from the crushing effect of the bundle.

The rope spring gets a pretty good squeeze on the limb.  The wood needs a little help to stop it from breaking down over time.  I  managed twelve sloppy shots before it became evident the exposed wood under the bundles was disintegrating in a plethora of longitudinal cracks.    The compressive force of the spring is more than hickory alone can bear.  Hence the curved wings.

Also note the new U bottom for the socket.  This makes the limb section 1″ deeper than it was before.  This added section will allow a limb  with a deeper cross section at its base for extra rigidity.

103 Responses to “Deeper in cross section.”


  1. Capn Harpoon says:

    Hey Nick, a little testing on my compounding design with 50lbs pull and a 20 inch draw. 175fps with a 400 grain arrow or 8 grains per lbs of pull, and the return is 3.5fps per pound of pull.

    As you can see even though hidiously underpowered, it still manages a very decent speed. A Scorpyd rdt 165 gets 425fps with a 400 grain arrow. Thats 2.6 grains per lbs of pull and the return is 2.5 fps per lbs of pull.

    This is with a shorter arm of 1 to 3 arm length to axle to axle. Next build at 1.4 will see if another sig. increase can be had. I will also be losing a few ounces of weight off the arms by going to a smaller diameter.

    The current design will get 200fps with a 350 grain or seven grains per lb of pull, the return is now up to 4fps per lbs of pull. I hope to get some 300 grain arrows and see if I can get 225-250fps from 50 lbs pull or 5fps per lbs of pull.

    Looking forward to your new beefier limbs. Was thinking that rounding the area in contact with the bundle (compression damage)will give you 25%+ more surface area and aid in evenly absorbed forces if you still run into pressure cracking.


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