jessejames
Member
Is there any info out there on proper dimesions for a ski jump. I want to halp out my little resort because there jumps are all wrong/dangerous. thanks
Jump dimensions/diagrams?
- Thread starter jessejames
- Start date
californiagrown
Active member
ask candide and mike wilson to design it, and then have dumont or tanner tell you the speed for it. youre all set.
yhprum1720
Member
HAHAHA. Great Idea!
LittleFoot
Active member
(thall's speed + Dumonts speed) / 2 = perfect speed
There really isn't a formula for building a jump...in fact, there's a group of people (mostly lawyers) trying to pass a law which forces terrain park builders (cutters) to build off of certain angles and shapes. The problem with this are a few reasons.
1. Different jumps need different angles and amounts of pop...i.e. step-downs require less pop than tabletops and step-overs.
2. These jumps change through-out the day...if they had to be a certain angle, they'd be closed more than they'd be open.
3. It would take a ridiculous amount of time and skill to get every single jump you build to be the exact right dimensions and angles....you really think a cutter is gonna get out of his cat at 3 in the morning with a protractor? Kinda absurd.
The best way for them to learn how to build jumps is to have someone who knows how to build them show them. This could be going to Cutter's Camp ( http://www.saminfo.com/events/cutters.php ), or having to actually hire someone to actual come and sit in a cat with them for a few days and just build jumps.
Also, don't be afraid to voice your concerns to your park crew, you most likely won't talk directly to the cutter (although, if it's a small enough hill you might), simply explain what you think needs to be adjusted (i.e. pop, launch, angles, landing steepness, knuckle cut, ect). They'll be abel to either relay your concerns to the Manager or to the Cutter themselves, OR explain to you why the jump is built the way it is. Some areas are required for certain reasons (i.e. lawyers, insurance, and/or management) to build certain jumps (like the hill I work at, we're only aloud to have Step-Ups, Step-Overs, and Tabletops open to the public).
1. Different jumps need different angles and amounts of pop...i.e. step-downs require less pop than tabletops and step-overs.
2. These jumps change through-out the day...if they had to be a certain angle, they'd be closed more than they'd be open.
3. It would take a ridiculous amount of time and skill to get every single jump you build to be the exact right dimensions and angles....you really think a cutter is gonna get out of his cat at 3 in the morning with a protractor? Kinda absurd.
The best way for them to learn how to build jumps is to have someone who knows how to build them show them. This could be going to Cutter's Camp ( http://www.saminfo.com/events/cutters.php ), or having to actually hire someone to actual come and sit in a cat with them for a few days and just build jumps.
Also, don't be afraid to voice your concerns to your park crew, you most likely won't talk directly to the cutter (although, if it's a small enough hill you might), simply explain what you think needs to be adjusted (i.e. pop, launch, angles, landing steepness, knuckle cut, ect). They'll be abel to either relay your concerns to the Manager or to the Cutter themselves, OR explain to you why the jump is built the way it is. Some areas are required for certain reasons (i.e. lawyers, insurance, and/or management) to build certain jumps (like the hill I work at, we're only aloud to have Step-Ups, Step-Overs, and Tabletops open to the public).
MLB
Active member
I build jumps on a professional level, so im glad to help out. You want your landing angle to be steeper then your take off angle. Usually i will make my landings steeper by 1 or 2 degrees.
Also you want the take off length to be about twice the length of the deck ( if you have the space.....minimum 1.5).
Now take off angles can be pretty tricky. The best way to go about jump building is that you want to push your wedge in a flat triangle. Then when you get the angle of take off that you want ( if your building a large jump....i usually go around 22 degrees, to 23. x-large im going to go up to 25. Everything lower then a med is usualy under 20) you want to put a gradual dish by backblading with your snowcat. You can do an even better job with transitions with rake work as well. As you get better at operating a snowcat, then you can progressively build your transition as well as your take off.
Also try to build your take offs LONG. The longer the better. The length of the take off dictates how smooth the transition is going to be. The shorter the take off, the more wu the jump is going to have ( which in my experience is bad).
Hope this helps you out. If you have anymore questions send me a pm.
Also you want the take off length to be about twice the length of the deck ( if you have the space.....minimum 1.5).
Now take off angles can be pretty tricky. The best way to go about jump building is that you want to push your wedge in a flat triangle. Then when you get the angle of take off that you want ( if your building a large jump....i usually go around 22 degrees, to 23. x-large im going to go up to 25. Everything lower then a med is usualy under 20) you want to put a gradual dish by backblading with your snowcat. You can do an even better job with transitions with rake work as well. As you get better at operating a snowcat, then you can progressively build your transition as well as your take off.
Also try to build your take offs LONG. The longer the better. The length of the take off dictates how smooth the transition is going to be. The shorter the take off, the more wu the jump is going to have ( which in my experience is bad).
Hope this helps you out. If you have anymore questions send me a pm.
steve0
Active member
Completely untrue.
There are a group of relatively simple formulas that govern bodies in motion that can be used to design safe and very fun jumps. Do most diggers or cutters use these? Absolutely not. But that doesn't mean that they shouldn't.
http://en.wikipedia.org/wiki/Kinematics
There are a group of relatively simple formulas that govern bodies in motion that can be used to design safe and very fun jumps. Do most diggers or cutters use these? Absolutely not. But that doesn't mean that they shouldn't.
http://en.wikipedia.org/wiki/Kinematics
californiagrown
Active member
dumbass just took a physics course.
youre gonna have to add in real-time coefficients for wind drag, frictional drag, degradation of the lip etc.
keep to your theory and let others design in the real world.
youre gonna have to add in real-time coefficients for wind drag, frictional drag, degradation of the lip etc.
keep to your theory and let others design in the real world.