Gen 4 recovery points

300bhpton wrote:

Lambert wrote: Interesting idea this. So for easy manufacturing use a set of available recovery points but cut off to sit just inside the bumper skin and weld an m36 coupler nut to the side and then have a 5 tonne WLL collared lifting eye to protrude for a shackle. One each side. Plenty strong.

For competitions we require high tensile nuts and bolts for all recovery points. Welding any of these will remove the tensile strength from them.

I take your point but I would contend that even a welded m36 coupler nut and lifting eye is still going to be attached to the recovery point long after the recovery point has been ripped clean out of the end of the chassis. High tensile fasteners are only as strong as what they are bolted to.

It could be manufactured to avoid welding, the eye nut housed in a machined block in a custom fabrication, this in turn bolted(with high tensile) to the chassis. I don't know if this is acceptable, or is it the fact that the eye is removable?
Regulations are tricky things.
Just for fun, not going to make any.
Mike

Lambert wrote:

300bhpton wrote:

Lambert wrote: Interesting idea this. So for easy manufacturing use a set of available recovery points but cut off to sit just inside the bumper skin and weld an m36 coupler nut to the side and then have a 5 tonne WLL collared lifting eye to protrude for a shackle. One each side. Plenty strong.

For competitions we require high tensile nuts and bolts for all recovery points. Welding any of these will remove the tensile strength from them.

I take your point but I would contend that even a welded m36 coupler nut and lifting eye is still going to be attached to the recovery point long after the recovery point has been ripped clean out of the end of the chassis. High tensile fasteners are only as strong as what they are bolted to.

Certainly won’t dispute that.

Although the regs do stipulate spreader plates and/or minimum thickness of the chassis member too.

Really it is more a case of common sense. If you need to perform a snatch recovery, something that can be required for off road vehicles. You need to have suitable recovery points that won’t fail when being used in this manner and need to be rated above the weight of the vehicle.

When large chunks of metal start flying through the air or a winch cable acting like a bullwhip. It could prove to be a very very bad situation.

Sadly many incidents occur due to the techniques being employed for a recovery also. Not just the hardware. But they often go hand in hand. That the people most likely to cause an accident are the ones with the least suitable vehicles and recovery points.

To further this. If you plan to off road (anyone) I would also recommend a good kinetic tow rope. These are so much kinder to recovery points with significantly less jolt and less risk of causing a recovery point failure. Any risks with such a rope are pretty equal with those of regular ropes too.

Appropriate use of shackles. Never join ropes with them.

Ncap rating would be 0 on that US jeep with metal kid killers stuck out front. that's why there not fitted in the EU.