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Is there a special way to build a jump the right way?

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.d.
Posts: 927 - Karma: 12
i want to build a bc booter, and i have a couple of questions...
1. how do u know it will make the landing?
2. how do u know how to make the curve and all to have it make the landing?

isnt there geometry involved...?

im not gonna go this into it for building a bcbooter but was just wondering about the geometry thing...



Oct 29 2007 9:12PM
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316
Posts: 57 - Karma: 10
first you need to pull a building permit.
Oct 29 2007 9:15PM
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skiwoj
Posts: 2286 - Karma: 52
I would say its all just an educated guess, build somewhere with a long landing so you can make it bigger than you think you need and still be safe
Oct 29 2007 9:16PM
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ski_DC
Posts: 1347 - Karma: 53
just eyeball it, test runs/speed checks. and dont make it curved, you dont know enough to do it right, you dont want to pop super high and case or something. make it a nice step down cuz then all you need is a wedge shaped jump and a decent inrun and youre good
Oct 29 2007 9:30PM
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ShadyHillGroup
Posts: 2881 - Karma: 213
guestimate it, make sure you have room for a long inrun so if you speed check you first guess and know you are going to slow you can still hike further up. building wise build the walls anf focus alot on the corners of the lip, thats the most important part, then fill the middle of the jump with whatever, shape wise shape it with your skis just my stomping ou t the lip and side stepping up and sliding down 
Oct 29 2007 9:31PM
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bikerocker
Posts: 1427 - Karma: 461
Just make sure the lip is nearly vertical, the length of the take off is about the same length as your skis, and flat landings are the best.  also it shouldn't be wider than a snowboard.
Oct 29 2007 9:43PM
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EH_DUBS
Posts: 3080 - Karma: 969
hes right



send me 100 dollars and i can get you one
Oct 29 2007 9:51PM
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doGelyst
Posts: 2491 - Karma: 508
if you wanna get reallly fresh, bust out some trig in relation to projectile motion and gravity. :P Google it.
Oct 29 2007 10:11PM
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Hairmetaler
Posts: 1200 - Karma: 15
that would be the safest way to build it
Oct 29 2007 10:14PM
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doGelyst
Posts: 2491 - Karma: 508
yea its nice going into a jump at x speed, knowing you will clear x gap, and hit the landing good. now air resistance, duh....but you can get a pretty good estimate leaving it out....and alot less overall work.
Oct 29 2007 10:17PM
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doublexl
Posts: 8407 - Karma: 26
are you joking?
Oct 29 2007 10:22PM
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316
Posts: 57 - Karma: 10
no
Oct 29 2007 10:23PM
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spliff.Life
Posts: 7847 - Karma: 1,549
900000x + 233285y-460z  =a jump
Oct 29 2007 11:13PM
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Elijah.
Posts: 9322 - Karma: 76
Like the guy above stated, you could use trig for a estimate, I think thats what some of the better maintained parks use, or you could eyeball it like the rest of it. My #1 tip for a good jump is piling the snow up, more than you think you'll need, pack it down, let it set for 15-30 minutes, then shape it.
Oct 29 2007 11:17PM
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Rippy087
Posts: 666 - Karma: 12
1. buy a radargun (speed)
2. look up some physics, velocity, ramp angle, projectile motion, etc...
3. calculate everything mathematically and subtract a few feet of travel for air resistance
4. do a few runs to gauge your speed without hitting hte kicker
5. hit the kicker

preferably put it somewhere with a pretty steep landing so if you undershoot/overshoot it by a little it won't matter

my best friends are all engineers, i'd just have them figure it all out.

or............ eyeball it, make judgements off of previous jumps you've hit ^^^^^^^^ is overdoing it i agree but if you wanna be safe you can go through all that trouble lol
Oct 29 2007 11:25PM
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Elijah.
Posts: 9322 - Karma: 76
like the rest of us*.
Oct 29 2007 11:54PM
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MEGAZORD
Posts: 4531 - Karma: -7
Ice blocks are always a good time saver.  Logs might work, atleast thats what we used to build bike jumps with.  Its better than shoveling an extra 4 cubic feet of dirt/snow.
Oct 29 2007 11:58PM
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landonn
Posts: 2913 - Karma: 385

just make sure it is packed REALLY WELL

Oct 30 2007 12:01AM
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crazyfuck
Posts: 5968 - Karma: -7
just eyeball it and make someone's younger sibling guinea it.  younger siblings are disposable.
Oct 30 2007 12:19AM
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MEGAZORD
Posts: 4531 - Karma: -7
Depends on the logs used and how well packed they were.  trust me, we made it work. 
Oct 30 2007 12:29AM
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freshlyDIPPED
Posts: 1160 - Karma: 121
i went to wal mart two days ago
Oct 30 2007 12:32AM
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MEGAZORD
Posts: 4531 - Karma: -7
We had logs in every single one of them and they lasted for years.

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Oct 30 2007 12:36AM
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birdshake
Posts: 1228 - Karma: 71
fancy
Oct 30 2007 1:00AM
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ktollefson_1080
Posts: 2061 - Karma: 183
lets try to be constructive here guys haha
Oct 30 2007 1:02AM
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Fish_Sandwich.
Posts: 9108 - Karma: 16
I don't ride bikes, but that's ill.
Oct 30 2007 1:21AM
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jergriff
Posts: 440 - Karma: 9
build it off of a cornis... then you dont really have to make a landing as long as the run below is consistant its pretty dope
Oct 30 2007 3:43AM
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australianjibber
Posts: 530 - Karma: -22
build it in the summer with some sand/rock/clay. do a few prac runs by putting candle wax on your skis, then adjust it necessarily, and wait for the snow to fall.
then, wait for the snow to melt, so the sand becomes more compact, and you have yourself a great jump
Oct 30 2007 5:51AM
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316
Posts: 57 - Karma: 10
ooohhh ohhh ohhhhhhhh call SPT
Oct 30 2007 6:23AM
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Bodeau.
Posts: 1637 - Karma: 48
Holy fuck is that monkey village?, Its like 2 blocks from my house!! I go there all the time
Oct 30 2007 7:31AM
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BUMP
Posts: 295 - Karma: 10
that kicks ass. i love dirt junmping.
Oct 30 2007 7:32AM
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Tucks
Posts: 2120 - Karma: 161
Have you ever even skied a kicker?
Oct 30 2007 7:35AM
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MEGAZORD
Posts: 4531 - Karma: -7
No its not monkey village, this is newjersey.

And yeah we tried it but it doesnt work.  The lips on the jumps are vertical and you cant get enough speed to clear the gap with te amount of pop
Oct 30 2007 9:48AM
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skiP.E.I.
Posts: 7605 - Karma: 20,103
you want to start out making a pretty flat wedge, like maybe 6 feet high at the end and 10-12 feet long for a step down. that is pretty floaty and won't throw you too high, just for starters. make sure you keep packing it down as you build. You always need way more snow than it looks like.
Oct 30 2007 10:00AM
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Treestman
Posts: 3049 - Karma: 300
at some angle theta, you forgot about that
Oct 30 2007 10:53AM
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slashquatch
Posts: 874 - Karma: 17
youve just gota eyeball it. it just takes practice
Oct 30 2007 11:51AM
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Vlox
Posts: 79 - Karma: 15
i dont think x speed will automatically calculate out to clearing x gap.
thats like saying going 100 km/h i would clear a 100km/h gap which first of all doesn't exist and secondly even if it was 100km gap you wouldnt make it adn you would eat sheat.

It would be more like x speedn clearing y gap... grade 6 math. 

Then if you want to get fancy you can calculate gravity, air resistance, friction of snow, what the effect of gravity is on you as you get higher, angle of power, energy required, snow density, effect of albedo of snow, trajectory, min and max of jump, graph your jump, add any variables such as trees in your way, calculate the probability of an eagle hitting you while in the air, distractions (like manbearpig), and probability of your mind not being able to handle all of this while you are in the air (but i can do that for you its 100%), probability of you failing and eathing shit (also close to 100%),  the speed of light while you are in the air, time dilation which occurs while you are moving, how long the landing needs to be taking into acoutn length contraction, and finally how much you will need to eat to be able to build and test the jump in order to have enough energy, and i forgot your mass at different points of the jump.

In short go to a ski hill where they may suck but at least they are already there.
Oct 30 2007 12:39PM
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