I am excited. This Wednesday, the MythBusters are doing the giant water slide jump. Maybe you are new to the internet and you haven’t seen this video. Here it is:
And since it is as old as the hills, of course I have already analyzed it – actually twice. First, the video is fake – but it is an excellent fake. Here is another site with details on how this was created.
What did I look at in my previous posts? Here is a summary.
- The video is difficult to analyze because of perspective changes.
- Even with these problems, nothing says it has to be fake. The vertical acceleration during the free fall is constant-ish.
- The horizontal velocity seems constant.
- To get to the speed that it appears the guy has, the slope would need to be around 40 degrees.
- The launch speed would be about 19 m/s at about a 32 degree launch angle.
- Landing in the pool should not be a problem. After all, Professor Splash jumped from 35 feet into a pool only 1 foot deep. So that is not a problem.
- The biggest problem would be variation in the jump – which it appears the MythBusters will look at. This should be great.
Worked out solution
It turns out that I also worked out this problem for a snow board jump (basically same idea). Here is the post on calculating the jump of a snow board ramp. I also made a spreadsheet for that case – so you can put in your own numbers.
The MythBusters Episode
This looks great. You can check out some of the clips already. Here is a shot that shows their setup.
From this, you can see they plan to do a 165 foot slide at 24 degrees with a 30 degree jump ramp. If they use this particular camera angle, it will be great for video analysis. If I put that info in the spreadsheet calculator (assuming a ramp length of 3 meters – which they did not specify) I get that the person will go 30 meters (98 feet).
I will make sure to record this episode.