How Much Force Will a Crane Exert on a Boat When Lifting 250 Pounds?

[Jim Lee]

I am trying to install a small crane to lift my disabled uncle into a boat. The crane is 41 inches high and the boom is 60 inches long. My uncle's weight is 250 pounds. What is the force that will be placed on the base of the crane. This answer will allow me to decide if I can mount the crane on the side or top of the fiberglass boat. Thank You

 

[Dr.D]

Your question is stated in terms of a fulcrum which makes it sound like a lever question, but then you asked about a crane on a boat. All in all this is not very clear.

To make it a bit more unclear, unless the boat is very large abeam, when you begin to lift your uncle, by whatever means, the boat will begin to roll changing the geometry and making the problem all the more complicated.

May I suggest mounting the crane on the pier?

 

[sir-pinski]

To determine the force on the base of the crane, we need to use the formula for torque, which is force multiplied by distance. In this case, the distance would be the length of the boom, which is 60 inches. So, the force on the base of the crane would be 250 pounds multiplied by 60 inches, which equals 15,000 inch-pounds.

It is important to note that this calculation only takes into account the weight of your uncle and does not consider any additional forces such as wind or waves. Therefore, it is recommended to consult with a professional or refer to the manufacturer's guidelines before making a decision on where to mount the crane. Safety should always be the top priority when installing equipment like this.

I wish you the best of luck in finding the best solution for your uncle's needs.