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| Speedboarding (19049 Posts)
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Speedboarding |
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Which Effect?
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On 1/6/2001
Chris Chaput
wrote in from
(63.168.nnn.nnn)
Roger you're right. I have no idea where I got "doppler" from. I was attempting to describe what some refer to as the "wing in ground effect" or "ground effect" for WIG aircraft. The Russian Eukranoplan called it "screen effect" (translation?). Whatever you call it, it provides 50% to 60% less drag/resistance when you are flying lower than the length of your wing to the ground. It's a pretty interesting subject. Check out this link.
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Doppler effects?
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On 1/5/2001
roger
wrote in from
(198.206.nnn.nnn)
Chris, I don't how Doppler effects is relevant, perhaps you where thinking of Venturi effects (relationship between velocity and pressure)…
Doppler effect is the compression of acoustic waves in front of a moving object, and the decompression behind the object. It explains why a race car's RPM sound higher when approaching and lower when departing. The concept of Doppler effect was extend by astrophysicists into the domain of light, known as "redshift" and "blueshift" depending if a star is traveling towards or away from the observer and provide a method of measuring astronomical speeds. Doppler effect is also closely related to sonic booms (accumulated compression of sound) as well as boats traveling in water (slow speed concentric wave vs. "v" wakes).
The compression forward of a moving object and decompression (draft) behind it are important qualities of aerodynamics and are similar to compression/decompression of acoustic waves (since acoustic waves are the cyclical variance of air pressure, the Doppler effect is about variance of cyclical variance). More important to aerodynamics are the "random", not the cyclical, variations in air pressure (turbulence) that accounts for the majority of air resistance and is one of the most complicated and least known branches of science (chaos theory).
By surface effects are you referring to something similar like a cushion of air?
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Wings
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On 1/5/2001
Chris Chaput
wrote in from
(63.168.nnn.nnn)
I don't think it would take that much getting used to. Windsurfers know exactly how much sail to expose to pop out during a waterstart in high winds. I think the biggest setback with the idea is that there would be times when you get a little off balance an extend your arms out for balance and end up losing a bunch of speed unnecessarily.
I always thought that a mini wing could be strapped across your back so that at high speed you would be totally "ground soaring" like a plane that never takes off. You would be using ground effects (the doppler effect) like seagulls gliding just above the surface of the water. Until of course you ate it and then more resembled TWA flight 800.
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wings
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On 1/5/2001
Jake
wrote in from
(24.16.nnn.nnn)
With wings, you'd have to open them up slower than you do with just your arms, so you don't fly backwards. You'd need it to be on a rope at the bottom so it doesn't flap away. JON raises a good point though...
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Big winds
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On 1/5/2001 Kludy
wrote in from
(64.12.nnn.nnn)
I like the glove but it would be a bit hard to hold a tuck . I do have built in my suit areas for the wing to do . It is very scary when the wind is at your face it will want to pull a rider ,CAPTAIN AMERICA with a wing system lookout .TAIL WINDS with the wings is for next time.
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Air gloves
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On 1/5/2001
roger
wrote in from
(198.206.nnn.nnn)
Perhaps gloves that are an air scoop when open for braking and a rear fairing when closed in a tuck. Imagine a baseball mitt size/shape that folds into a cone behind the butt, and opens up for "catching air" or sliding on palms. It would have to be soft enough to not be a safety hazard, flexible to change it's shape, strong enough to not fold in the wind, and have the wrist support and protection for falls. It would not be the first goofy looking aero gloves made
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BAT WINGS
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On 1/5/2001
JON
wrote in from
(213.123.nnn.nnn)
batwings do work kind of, but they look ridiculous and will completely destroy your chances of pulling some race slut after the event. I know my priorities..............
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Parachute
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On 1/5/2001
kaylee
wrote in from
(209.43.nnn.nnn)
...but I guess that might lead to an unwanted superman, so instead of falling off the back, you fall off the front. It would all work okay with bindings, with FAIRINGS!!
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air brake
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On 1/5/2001
kaylee
wrote in from
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Put a parachute on the board instead. That way the drag won't yank you off the board, and the frictional force would be in the same direction as a regualr disc brake, i.e. the board stopping you instead of you stopping the board.
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Aided air-braking
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On 1/5/2001
Danny Connor
wrote in from
(64.12.nnn.nnn)
Hey Guys,
There are a few things I can think of that would be wrong about using some kind of "cape" thing for slowing down. I would think that it would take a lot of getting used to. I mean, putting your arms out at 60 slows you down faster than you can believe. If you had a cape, I think it could be dangerous to have that thing grabbng that much air that quickly. The other thing is that it could cause a problem with visibility if other riders needed to see aound it. To have it flapping around at your sides while in tuck, would not only be destracting, and hard to see around, but it would also slow you down. Well, at least that is what I think about the subject. Later.
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AIRBRAKING
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On 1/5/2001
LEO
wrote in from
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, i thought of that, maybe like the suits the cam divers use for videotaping the skysurfing, or a little parachute attached to the back.....
leo
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airbraking
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On 1/5/2001
Jake
wrote in from
(24.16.nnn.nnn)
Hey, I was wondering if it would work if someone wore a kind of cape thing between their arms and their sides, kind of like Dracula, if you know what I mean. Wouldn't that help slow you down faster? When their arms are by their sides, the 'cape' would be smal and I don't think it would get in the way too much.
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First Race
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On 1/5/2001
Chris Chaput
wrote in from
(63.168.nnn.nnn)
The first race is Barrett Junction on February 17th and 18th. Check out: http://www.SkateRelated.com for race info. The bottom of that hill is long less technical than the top and can be heavily aided by wind.
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DHX
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On 1/5/2001 Craig
wrote in from
(196.34.nnn.nnn)
Hey Kludy, have you organised yourself for cape town yet? Is that the first race of the season??
A strong tail wind on that road only makes the hairpins in the big-S a lot more technical, after that you'd get speeds somewhere between 90 and 100KM/h.
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72,77mph
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On 1/4/2001
roger
wrote in from
(198.206.nnn.nnn)
Jon,
I don't think anyone is slamming the rider, just laughing at the sensationalism writing style of the author and even worse glorifying and image of recklessness. Did anyone notice that the title bar on the page says 77mph, still more exaggerations.
Clark502,
I meant no offense, not sure why I addressed my response to you
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Big WINDS
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On 1/4/2001 KLUDY
wrote in from
(64.12.nnn.nnn)
The leathers , the helmet . In big winds you can go real fast 72 ," maybe ". I hope we have big tail winds at the 1st race of the season . I have been lucky the last few weeks and we have had BIG tail winds and the bottom half was smoking .I would never try speeds over 50 mph without gear. I started typing on this site and can do this short story in under one hour . COOL HAAAAAAAAAAAAAAAAA !
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72
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On 1/4/2001 Herbn
wrote in from
(216.107.nnn.nnn)
so the x games he was training for are over,twice? does anybody remember this guy? oh well,i had to join the fray.Like an internet bar fight were the guy that caused it ducks out:)
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72mph
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On 1/4/2001
Jon
wrote in from
(213.123.nnn.nnn)
Hugh, they are 70mm classics in orange which for some reason behave much more like the old embossed reds than any other colour. Enjoy.
It is really amusing to see the reaction to the 72mph article, I doubt very much that those who put this guy down have bothered trying to contact him or the paper itself to find out more. We all know that the press exagerate as a matter of course and are completely clueless about any sportts other than the usual armchair athlete fare. I had a copper at Santa Rosa 99 tell me that he had me on radar at over 75 mph. anyone who was there will know what crap that is, but imagine if the press had got hold of it? Would I be the one being villified right now? I used to think all skateboarders were family but things like this make me think twice...................Imagine how that guy must feel if he read your postings. "The words of a hack make not the man" said Oscar Wilde................
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72 mph article
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On 1/3/2001 GBJ
wrote in from
(207.172.nnn.nnn)
Am I the only one here who even noticed that the article in question is over two years old?
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72, sure pal
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On 1/3/2001 Danny Connor
wrote in from
(64.12.nnn.nnn)
Well, the article said!
Just kidding. This dude lives in the Sierras, and so do I, maybe he can teach me how to go 72 on my skateboard. I hope he shows up to the EDI race in Trukee! That is, if he has enough bearings and all. It was good for a laugh!
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Barrett
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On 1/3/2001
Danny Connor
wrote in from
(64.12.nnn.nnn)
Hey Fellas,
This hill is fun. But what I found to be painful was watching people go down left and right! I was close to hitting Chris when we were doing our practice run, those tractor tracks are unforgiving! You really have to pay a lot of attention about how your feet are positioned, and you will be moving them a lot to get them in the right spot on your board. New comers need to be ready for a lot of vibration, and moving a whole lot. This hill will teach and humble you at the same time! Can't wait to see everyone in Feb!!!!
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Levitation
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On 1/3/2001 Herbn
wrote in from
(216.107.nnn.nnn)
Imagine if you could just somehow jump right over,taking your board with you:) sorry,i couldn't resist.
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Barrett Junction
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On 1/3/2001
Chris Chaput
wrote in from
(63.168.nnn.nnn)
What I found to be quite painful about Barrett is that shortly after you navigate through the second right hand hairpin and start to get back up to speed, there are some permanent Catepillar tracks that run diagonally from right to left across most of the road. They must have been made when the asphalt was still soft and then set up like dinosaur fossil footprints. Depending on how you hit them, you can either just make a cool fluttering sound when you go over them or you can do a full body slam (as I did in practice) while just going straight. They are hard to see, even if you know where they are. I treat them like railroad tracks on a motorcycle, better to go "across the grain" then parallel to them.
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Barret
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On 1/2/2001 DT
wrote in from
(216.126.nnn.nnn)
About a year ago, several of us had been riding most the day, on our last run, i was racing my friend Aaron. We had already made it through the hairpins and were coming out of the straight going into the rythem section before the final straight. as we came out of the 4th turn which is a right that goes into a left, a lost car was coming up the middle of the road. I stood up and lunged to the right missing it by about two inches, You should have seen the look on this guys face. Aaron was not as lucky, he was drafting me and was delayed, he managed to miss the car by jumping off his board, he landed and rolled while his board hit the now stopped car's tire. This guy didnt speak english and was clearly scared, we all gave him a thumbs up sign and he slowly went on his way.
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Barret Junction... A place of many myths and fallen heros
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On 1/2/2001 cheshirepus
wrote in from
(209.178.nnn.nnn)
How do you deal with constant traffic coming UP a one lane hill while you are rocketing DOWN at drawer filling speeds? There's one place to learn... And that place is Barret Junction. I wouldn't skate off the road due to the sheer cliffs on the one side, and jagged boulders on the other, so the best bet here would be to just take the car head on and hope for the best. You could try to close the road off, I guess, but that rarely stops the many sports cars and motorcycle gangs that like to cruise up. I remember when I skated down this poor excuse for a rideable hill... When I finally figured out how to position my feet in order to compensate for all the wheel sized cracks and rocks that make up the road, I found myself dodging all sorts of obstacles. There were cars, tumble weeds, broken glass from the locals who were trying to hit us with bottles, and rediculous turns, not to mention the fact that footbraking would cause you to break an ankle from your toe being swallowed up in a hole. If you want to ride Barret, that's your problem, but just make sure you go out with a snakebite kit, off road vehicle, and rapelling gear (For plucking fallen heros from the depths below).
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