# Line tension attached to Parasail?

1. Jul 21, 2008

### mav7

Not sure what to expect here.. but figured I'd at least ask!

Background: I heard of examples where a parasail can actually lift a boat out of the water. Also, I've seen instances where increased wind speed as caused the rope to break, which is rated for 8000lbs.

I'm wondering how you can estimate the force that will be applied to the rope based on certain variables. If I left anything out, let me know.

Let's say we have a 3600lb boat (weight includes passengers, fuel and gear) traveling 25mph, with a parasail attached. The pilot is 180lbs. There is a wind speed of 15mph. The boat is traveling into the wind. I'm assuming we will need some sort of variable for drag created by the parachute, not sure what this would be. But let's say the parachute has a 28 foot diameter if that helps.

Q1) What will the tension/force be on the rope, in lbs?

Q2) What conditions would need to be met for the boat to be lifted out of the water?