[jk999]

Confused now 😕

[robert mitchell]

Maths has the answer, and specifically the equations of motion.

We want to know the force generated when 650 kg comes to a dead stop in a crash (about 0.05 seconds) from 30mph
(For SI units, 30mph = 13.441 metres per second)

Force = mass x acceleration

So we need the acceleration, given by the equation of motion

V= U+ at
(V: final velocity, U:initial velocity, a:acceleration, t:time

Rearrange that equation to make ‘a’ the subject and you get

(V-U)/t = a

Acceleration = (0-13.441)/0.05
Acceleration = -268.82 m/s/s
(It’s negative because it’s deceleration)

So, force= mass x acceleration
Force = 650kg x 268.82m/s/s
Force = 174,733 newtons
Or 17.817 metric tonnes.

So assuming you only ever drive at 30mph, your anchor points behind the tank (the front ones won’t be any use of course) must be able to hold 17 tonnes between them.

Seems about right, Ionics video says 1,000 litre system exerts a force of 52 tonnes in a ~30mph crash.

https://youtu.be/9usI6qFzfpo

This kingpin (about as thick as your wrist) is capable of pushing,pulling and stopping the 40 tonne trailer its attatched to.

No it isn’t. The trailer has its own brakes.

Its still got to pull it from a standstill.

Its not exerting anywhere near 40 tons of force when you pull away , assuming it has wheels on of course!   Exactly the same reason that a 5 ton tirfor hand winch can pull rolling stock .


Its only my opinion but i think anyone that uses ratchet straps to hold their tank in wants their head looking at.

[CleanClear]

Its only my opinion but i think anyone that uses ratchet straps to hold their tank in wants their head looking at.

Only if it hits them.

[robbo333]

https://www.ratchetstrapsuk.co.uk/

This seems a good website. Personally i'd get the highest rated ones and get 4 of them (1 for each corner).
I think you can also upgrade your D rings and bolts to high tensile ones.
If you want to go a step further, then get longer bolts (that go right through the floor) and finish these off with a large washer, nut and heavy duty spreader plate for each of the 4 corners.