EFH is typically around a 4-5 feet high maximum in the ski industry. This usually involves a landing that gets steeper as it gets farther from the knuckle. The goal is to create a landing where the impact is nearly the same or does not surpass the EFH along the entire landing. The table and landing ramp should be designed to lower the impact upon landing to a “safe” distance. If it’s not evident, what have you ridden or built that worked, or that you really liked, did you consider measuring it to recreate it…and is your speed the same? See the PDFs listed near the bottom of this page and the discussions surrounding Equivalent Fall Heights (EFH). You can bet your ass that some stuntmen and record breaking jump events broke out calculators and rulers, and possibly consulted physicists or engineers. Ride more or build more? Eat shit more? The answer is obvious, do your homework first. Unless of course you want to move earth multiple times rather than ride. The likelihood of a rough landing or total miss and serious crash are lowered if a little math is done first. However, chances are their luck has run out more than once, as well as their time riding because they were re/moving dirt, perhaps with elbows, knees, and face. Experienced builders that don’t break out calculators are good at witchcraft, or perhaps its craftsmanship/art they can see the parabolic line of flight when they build because chances are they have enough flight-time to render themselves Pilots in Command. The math starts relatively simple for jumps and ladder drops (see below), but a lot depends on the rider, the bike, and how they behave on lift-off, but a little math will get riders/builders in the ballpark faster so there is more science and success, and less trial-and-error witchcraft. By science I mean the consistency or repetition of outcome, and even prediction, which is what riders seek- science meets mathematics (and art or craft). I think a lot of builders go with trial and error: ride it, reshape it, ride it… In other words, experimentation or science. I’ve also gone too slow and too fast on jumps and suffered the consequences. Regardless, I’ve hit some good jumps and drops that seem to be dead on, take-off to landing that is. If things start to get over 5 feet high or more than 20 feet between lip and landing, especially with gaps, I’m probably not going to do it. Email me if you want help designing a jump park.I don’t hit huge jumps, drops, or gaps, at least not at this point in my life. Beginners need low faces, gentle curves (about 30 degrees) and low speeds.If you’re going faster than you need to clear a gap, the angle will be 30 degrees or less, the face will be very low, and the curve will be very gentle.If you’re going for height, the angle will be 60 or more degrees, the face will be tall, and the curve will be tight.If you’re going for distance, the angle will be about 45 degrees, the face will be low, and the curve will be gentle.You need a smooth transition otherwise you’ll crush your bike, and your eyeballs will rattle in your shoes. The higher the speed, the longer and taller the jump must be.The farther or higher you want to go, the more speed you need.The details are too involved to reveal on this site (for free), but here are some basic ideas: You basically want to place the rider at the end of the ramp, at the proper launch angle, without subjecting him to forces he or she can’t handle. Length, height and curvature are trickier. Nifty!įor the equations and an online calculator, check out You can make a jump tiny or huge by sucking it up or pumping it hard.īy the way, speed dramatically increases distance and height. NOTE: This totally ignores suspension, technique and every other variable. As you get steeper, distance drops but height increases. As you get flatter, distance and height go down. A vertical lip will shoot you 7.5 feet up, but you’ll land where you took off. At 15 mph, an 80-degree lip will launch you seven feet into the air. On a 55-degree lip you’ll fly 14 feet (the same as the 35-degree lip) but fly twice as high: 5 feet.įor the greatest height, make the lip as steep as you can handle. On a 35-degree lip you’ll fly 14 feet out and only 2.5 feet up. If you carry 15 mph off a 45-degree lip, you’ll fly 15 feet beyond and 3.8 feet above the lip. Of course there’s a formula! Actually, there are a bunch of formulas.įor the longest distance, you want a 45-degree lip. Is there a formula for figuring out the best height, length, curvature and angle of a jump to achieve the longest distance and height? And what would be the differences if you had the angle of the take off at say 35, 45 and 55 degrees?
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