heh, i know, but i only half-remember the physics. (i was a liberal arts type). like gravity acceleration . . = -9.8m/s² . . . then with the inclined plane, it slows that down somewhat. the steeper the better for speed obviously, but a person also needs to transition from perpendicular to horizontal without too much g-force.... . . .
run some math... .
I was thinking the other day, maybe it wasn't so much the steepness that was the problem, it was the lack of a decent sized tranny at the bottom. If they had put a 14 foot radius quarterpipe at the bottom of that thing . . . .^that looks hellish^
I remember the roll in on Hell Track was originally too steep/scary so they had to change it for the actual filming/movie. I forget what the numbers on it were though.....
yeah, post some pics.... i'd like to see what's coming after the roll-in. like, you dug 3 feet down, just under the roll-in.... or does the line continue for a while below ground level? (cuz if you dig a hole to gain momentum going downwards, you also use part of that momentum to get back up out of the hole).Hey cmc - I am working on a roll-in for a little pump/jump track in my backyard (I think this is version 5, haha). It can't be tall unfortunately as I don't want to piss off the neighbors. Deck will be 3' and then I dug 3' into the ground so 6' tall total. Also, I'd like my kids - ages 5 and up to be able to get in on it and not blow up. What would you think radius wise? I was thinking 10' and then round off the top with a reverse 5' but would love to hear what you think.
I'll throw some pics up as I get done with the deck to give a better idea what I'm working with.
I think 12' tall at a minimum.I'm moving to a new house with my family, gunna live there for a month before I go away for university. I'm allowed to put in one jump, so I'm gunna make a wooden kicker, and a dirt landing, make a nice step up. One question though. What size roll in should i put in? out backyard is completely flat. Like there is no incline to it at all.
Damn, those guys are getting some throttle off that setup. Doing a big set right off the bat. Pretty cool how they drop-in on a ramp to the platform and then drop off to the lander.i'm starting to think the platform-to-dirt-landing style is the best for 'trails' setup roll-in cuz that first landing kinda gets the flow going. . . .
steep works well, that dude just needs a much larger bottom radius. think of riders blasting airs out of a bowl. transitions to vertical faces and with just a few pumps you're already getting above coping. no pedaling required other than to actually get moving...I'm of the opinion that a longer flatter roll-in that you can actually crank down produces the overall fastest speed.