Which Shackles are you using?
#16
01-25-2019, 02:38 PM
I'm only interested in how to think about this clearly and wanted to raise a question.
#17
01-25-2019, 02:58 PM
#18
01-25-2019, 03:54 PM
For sure - I'm actually pretty interested in this myself now, too. I can only speak for my trailer but I think the connection of the chains to the trailer is my weakest link and would give way before my shackles did. If it didn't fail entirely I figure the connection to the trailer would yield enough to be able to rely on both shackles... Plus shackles **usually** have a 5 to 1 safety factor (can't say for sure if the ones I linked above fall into that category).
Going back to my mention about the impact force... If I assume a 1500 lb tongue weight falling 2 feet onto the chains and taking .1 second to go from a velocity of 11.35 ft/s to 0 ft/s I think there's only about 6800 lbs of impact force applied to the chains and shackles. That changes pretty drastically though if the assumed time to stop after the chains take up is shorter though (12,000 lbs if it's actually .05 seconds, for example).
Then again I'm definitely the wrong kind of engineer for this and I could be entirely wrong... If anyone knows better I'd be interested in knowing how to figure that out.
Going back to my mention about the impact force... If I assume a 1500 lb tongue weight falling 2 feet onto the chains and taking .1 second to go from a velocity of 11.35 ft/s to 0 ft/s I think there's only about 6800 lbs of impact force applied to the chains and shackles. That changes pretty drastically though if the assumed time to stop after the chains take up is shorter though (12,000 lbs if it's actually .05 seconds, for example).
Then again I'm definitely the wrong kind of engineer for this and I could be entirely wrong... If anyone knows better I'd be interested in knowing how to figure that out.
#19
01-25-2019, 05:58 PM
#22
01-26-2019, 12:02 PM
Hotshot
I'd rather my trailer break away from me and do its own thing (breakaway system to lock the brakes) rather than sent my truck into an uncontrolled fishtail and flip me over.
#26
02-02-2019, 05:13 PM
#27
02-04-2019, 10:44 AM
#28
02-04-2019, 11:25 AM
I simply use 3/8" G70 grade hooks on my chains (chains also 3/8" G70). and have no issue with the hooks fitting the hitch. Yes, I have the 3" receiver. You can buy these hooks at just about any hardware store for less than $10 each and a simple cotter pin and done. Just my $.02 worth 
#29
02-04-2019, 11:29 AM
Mine is a 2017. I didn't think they made changes but perhaps they did. I know some were complaining about this when the 2017's came out but I figured they were just using much smaller hooks. I do agree that Ford could have designed this better and made it easier to hook the chains on.
#30
02-04-2019, 11:42 AM
Mine is a 2017. I didn't think they made changes but perhaps they did. I know some were complaining about this when the 2017's came out but I figured they were just using much smaller hooks. I do agree that Ford could have designed this better and made it easier to hook the chains on.