Here are also some pictures of the Reul and the LeTech winch mounts
I fitted the LeTech winch mount last week.
Inspired thru the comment of Greasemonkey that the winch mount is only connected to two bolts on each side, four together, I tried to calculate the power that pull at each bolt.
(Before I started my carrier at Law enforcement I went to University to get a mechanical engineer, but did not graduate....
But some things I still remember and I'm glad to still have some knowledge besides looking evil at people)
I'm going to explain my scientific calculation as simple as possible:
When the winch is working, the drum turns and pulls on the rope.
The force is pulling towards the point, where the rope is fixed.
The winch tries to turn, that means, the bolts fixing the winch to the mount get different force.
The two bolt in the back are getting a pull force the two in the front are getting a push force,
Over the winch mount plate these forces are directed to the fixing points of the mount to the frame.
In my calculation I ignore these forces that work in different directions to the force that pulls on the (only) four bolts that attach the mount to the frame of the Grenadier.
(For sure the force on these four bolts is reduced because of a drain of force thru the bolts holding the winch on the mounting plate)
Lets assume, the complete force from the rope leads to the four bolts to the frame. A quart of the force goes to each bolt.
The LeTech winch mount is proven by the German TÜV and the engineers there take care of every little part in a construction like the winch mount.
For sure they also controlled the four bolts.
We are talking of different rates of durability of screws in a screwed connection. The rates start with 8.8, 10.9, 12.9. and so on.
If we assume, the bolts have the lowest rate, 8.8, (allegedly more) it would mean, a bolt will rip of when the pulling force to it is over 800N/mm². (N/mm² Newton per square mm)
The bolts that are used in the mount have a thread of M12, means the inner diameter is 10,11 mm following that the surface area is almost 80mm².
The result is, that one bolt will hold a force of 64.184 N, in KG , 64.184N divided thru 9,81N/mm² : 6.543kg means 6,5 tons!
(Is the rate of the bolt 10.9 we talk about over 8 tons!)
Lets assume the winch has a pulling power of 6 tons and the Grenadier is fixed to a solid point, no mud or sand (thats much less), force of 6 tons to four bolts will provide a force of 1,5 tons to every bolt.
Result:
A bolt in the resistance class of 8.8 will rip of over 6.5 tons, a winch with pulling power of 6 tons can provide 1,5 tons pulling power on each bolt.
The bolts are more than four time stronger than a 6 tons winch is able to pull. (pulling straight!)
(Four of the bolt together will rip of if they are exposed to a power over 26 tons)
I hope You can follow my depiction, please correct my if I took a wrong turn on my way to the result!
Regards Sauerländer