Damper Selection

  1. Hi ,

    I am making a shooting rest for my high power rifle and I would like to have a damper take most of the recoil energy so that the shooting rest doesn't move back or up when shooting.

    I attempted to calculate what damper would be appropriate for this but I am getting results that don't seem realistic. For example, according to my calculations, a damper that is rated 100lbs and has a stroke of 7inches would only absorb 1.6% of the muzzle energy. A damper that is rated 250lbs and has a stroke of 17 11/16 inches absorbs 10% of the muzzle energy? I must be doing something wrong...

    Here are some numbers:
    Muzzle energy (of the projectile) 3502 ft-lbs.
    Rifle mass: 8 lbs.

    Questions?
    What size damper should I use?
    How much of the muzzle energy actually goes into felt recoil?
    What is the formula for multiple dampers and springs connected in searies or parallel?

    Thanks
     
  2. jcsd
  3. Drakkith

    Staff: Mentor

    I don't think your muzzle energy will be 3500 ft lbs when calculating the kick of the rifle. A bullet weighs very little and will be accelerated to a very high speed, while your rifles weighs many many times that at 8 lbs. I dont know, but perhaps it is 3500 divided by the weight of the rifle??
     
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