Recoil & Stock Design

[DenisA]

[bsouthernau]

[IanP]

Using a video to help work out best rifle balance/stability.

I can take high speed video, (relatively speaking) using a Panasonic FZ200 at 240 frames per second in VGA mode. When you consider a recoil velocity of 6 fps then that should give me a capture rate of 0.3" of riflestock travel per frame. Good enough to get some idea of what the recoil reaction will look like with the stock weighted and supported in different positions.

Here is the outline for the basic tests I am considering. Please advise if this is reasonable or if it could be conducted better in a different setup. I am open to any helpful advise!

1. Support the complete rifle from two nylon fishing line "strings" at points where the rifle would normally be in contact with the bags.

2. The attachment lines would be supported vertically over the rifle.

3. The rifle would be free to move in any direction while supported by the strings.

4. Attachments to the rifle would be wide belt like slings. No wider than the bags that the rifle would normally ride on. These would be attached tightly and taped with a ring attached at the top for the nylon to attach to.

5. A string would be attached to the trigger and require a force of 6 ozs to release.

6. A full target load would be fired and the recoil recorded on video.

This exercise would be repeated using different attachment points to mimic different bag distance setups. Also weight could be taped in place to alter balance and c of g.

The video would be taken from elevation, (side on) and end elevation from behind the rifle butt in an attempt to capture both recoil and torque. This would require 2 videos to be taken of the same load and setup as I dont have 2 cameras available to do it simultaneously.

Comments please!

Ian

[DaveMc]

[RAVEN]

[DannyS]

[Brad Y]

[IanP]

Dave, interesting observations and much appreciated. Not overly concerned about the pendulum effect as only want to see the initial reaction of recoil and torque overcoming the rifle inertia. The nylon could be attached to free travelling rings sliding on a rod above the suspended rifle.

An easy test for balanced weighting of a rifle around the bore axis would be to place an axle thru the bore and action and see how it rotates. Like checking a bicycle wheel and watching the valve and stem settle to the bottom under gravity. Still does not take into account stability riding on the bags where a low c of g and bottom weight may assist.

Here is a video of a rifle setup to behave in a recoiless state. Thanks to Range Rector for sending me the link.

http://www.youtube.com/watch?v=3YUTfoxX_Cc

Ian

[IanP]

[IanP]

[Cameron Mc]

Only just read this thread. This is the stock Alan N made for me. He shoots long range BR and now F Class. I tried it with a Pierce Stainless action and barrel in 284 Shehane. It controlled torque to a certain point. I went back to my trusty MBR Tooley stocks as at that time the World Champs were coming up. It is now sitting in the cupboard as a stock only.
Cam

[RAVEN]

Looks like a 59 caddi

[Cameron Mc]

[williada]

[DaveMc]