Originally Posted by Impulse
I see no problems with the concept of a right angled pull through a pulley block. .
Yup..I do agree ..there is no problem doing it.. after all .. cranes have pulleys on the end of their jibs and lift huge weights without a problem..its the same idea.
IMO ..The biggest problem is not really if the rope breaks .. because if it does, it will fly back in a straight line.. and if it was going to cause damage..it would be to the car pulling the rope..or to the boat and trailer ..where hopefully no one is standing ready to apply the brake or a chock under the wheels to save the boat rolling back down the slipway. They could be injured by flying rope if they were.
However if the pully broke ..or its mounting .. then anything or anyone in the area of the 90 degree pull will probably be damaged or ..if a person .. injured or killed. Think of the strong rope for extra safety .. as a huge catapult..powered by the weight of the boat trundling down the slip.
No matter how careful we are..accidents do happen. Thats why we are taught to do risk assesments..to reduce risks. Putting a pulley in the system and pulling at 90 degrees greatly increases the area of risk. Pulling in a straight line keeps the risk to a minimum and thats what I try to do.
The pulley at 90 degrees also increases the risk of the rope breaking as more force is required.
Using heavy rope..and non stretch winch rope..all reduce the risk of accidents happening if things do go wrong..so that is good.
Can you pull the boat up by a 180 degree pulley pull..ie drive your car down the slipway to pull the boat up. That will reduce the area where damage can occur to a straight line again.
Its also good to have a back up plan..in case something does go wrong.. as someone suggested..a secondary rope to apply the brake..or a blanket over the winch rope as it will reduce the risk of it flying back at speed.
As I first mention.. if nothing gives way.. then it is perfectly safe way to recover the boat.
If something goes wrong ..... I wonder if insurance will foot any bills ?