Kicker calculations

Plus, if you help build it ur invited haha

**This post was edited on Apr 26th 2022 at 9:24:33pm

sooo…a water ramp? I’d just look at actual water ramp facilities for info, though maybe people on here know good dimentions. Just make it very kicky

Interesting. When I build a jump in the back country now (due to many failed builds) I use actual ski measurements from a decent park jump... at least 7-8 ski lengths from the bottom of the transition to the lip. I actually took my ski off and measured out a nice healthy 35 footer in the park for this. Obviously jumps are not triangles either so make sure you don't just build a wedge, it has to gradually get steeper, and generally 6ft tall. I would be cautious about the amount of kick as water ramps generally have air pumped into the water to make it softer, and water is fucking hard. Maybe throw an air compressor line in the water where you plan on landing?

A popular design for freestyle motocross ramps back when we didn't have money or resources for metal was to use 3/4" plywood for the sides and cut out the shape. Might hold up if not hitting it with a dirtbike lol.

How do you plan on getting speed? a hill? tow with a boat?

HHHHmmmmmmmmmmmmmm got me thinking

ChuckomodeWe’re going to build a jump into a lake at our cabin and I’m looking for advice. I want to make it the most like a big park jump where you can get doubles around comfortably and yank triples (35-45 ft). What is a standard angle of launch for these type of jumps? Also, about how high does a person reach on these type of jumps and how high is the jump itself? I need those units to calculate the run-in height and ideal velocity at the top of the jump. If anyone knows anything about building jumps into water and/or the dimensions and angle of said kicker let me know. Thanks.

trial and error helps to find the launch angle.

@theabortionator = park creation veteran

Just make sure you go faster than Tanner did.

https://inside.mines.edu/~jamcneil/BigAir.pdf

Heres a good analysis of jump dynamics, though you may have to recalculate adjusting for the increased drag coefficient since they didnt take into account the 4xl pants and tall T you should be wearing.

I say eyeball it

I've always built my jumps about equal to the slope angle of the landing. Since you're landing in water, I'd go with approx 32.625 degrees. Jk honestly if you really want pop, 40 is a good poppy jump. Keep in mind this angle is only at like the last ski length of the jump. As previously said, make your jump somewhere between 6-9 ski lengths, with each ski length increasing in pitch slightly. I would make your frame out of 2x4s, 2x6s, or whatever decently thick wood you can find for your price range. Make the basic frame, then lay up the ramp with 1/4"-3/8" plywood and screw in some M Snow or turf. Sounds like a fun project! Good luck

little1337https://inside.mines.edu/~jamcneil/BigAir.pdf

Heres a good analysis of jump dynamics, though you may have to recalculate adjusting for the increased drag coefficient since they didnt take into account the 4xl pants and tall T you should be wearing.

Sick paper, I'll definitely be coming back to it.
The only place that drag should really matter is during the inrun, usually people don't get as much speed as they expect at first. In the air it's pretty negligible, especially if you're doing some sort of trick, the spins will induce far greater effects than drag. Also, this is into water, I doubt they'll be wearing much clothing at all

**This post was edited on Apr 28th 2022 at 10:24:43am

i think there are a couple of ways to go about this...

first i would find out actually how much speed you can get. believe it or not, but water ramp in runs for the size of jump youre talking about are huge. my guess is about 20m height.

45 degrees is steep imo but it will give you best height and distance for your speed. the only water ramp ive been on felt damn close to 45 degrees. i could be way off here but i guess most snow jumps are 15 - 30 degrees?

when i build pow booters i make the top of my in-run over two and a half times the height (in elevation) i want to get coming off the jump. obviously that depends on the steepness of your in run and the angle/height of the ramp too. my rule of thumb is assuming my lip is around 45 degrees and little speed loss on the in run.

i know this is really old, but it seems like this is what you are going for:


https://www.newschoolers.com/videos/watch/1047898/Jon-in-Stockholm-day3
once again, its a really big project. especially if your are completely serious about doing triples or even doubles