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| Misc Equipment (2108 Posts)
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Abuse
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On 9/3/2002 Dave G
wrote in from
(208.29.nnn.nnn)
Did I get an abuse rating??
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x-15
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On 9/3/2002 dAVE g
wrote in from
(208.29.nnn.nnn)
The assumption you make is a correct one..But media driven! The X-15 you refer to was far different than it's brother models! It was fitted with 2(count them ..2) liquid fueled booster rockets that were added to acquire the added altitude. It was more of a atmospheric research probe, who's sole purpose was to explore the outer realms of our atmosphere, than to break any speed records. Read all the text you'd like to, but the facts I am privy to are first hand from the people that helped make it happen! And some unprinted documentation! If you'd care to continue the string, I'd be happy to enlist a panel of experts (not encyclopedia readers) to answer the most intimate questions you may pose!!
Just another country bumkin'
Dave G
Enjoy, I'm gonna deploy
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Chutes away!
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On 9/3/2002 PSR
wrote in from
(216.114.nnn.nnn)
And no one hear yet noted that the speed of sound is in fact Higher at High altittude,as with the air particles being more scattered,it takes longer for them to collide and therefore transmit sound! Our skydiver was cruising back in the day! (the other 60's airspeed record mentioned here,with the X-15;it should be noted that higher = Faster for a given Mach number,and X-15's went more than Mach 4,and even flew high enough to leave the atmosphere) As for the original idea behind this thread,I noticed that in my copy of "Downhill Motion",Skitch Hitchcock had a chute on his kneeboard at Signal Hill;It looks as if he could've used the rigging our Mr. Radev has come up with,as his board got all squirrelly at the bottom of the hill.
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Gale force winds
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On 9/3/2002 Major Major
wrote in from
(68.15.nnn.nnn)
are blowing today. I quote:Because of the large fuel consumption of its rocket engine, the X-15 was air launched from a B-52 aircraft at about 45,000 ft and speeds upward of 500 mph. The airplane first set speed records in the Mach 4-6 range with Mach 4.43 on March 7, 1961; Mach 5.27 on June 23, 1961; Mach 6.04 on November 9, 1961; and Mach 6.7 on October 3, 1967. It also set an altitude record of 354,200 feet (67 miles) on August 22, 1963
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Ground Control (to Major Tom)
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On 9/3/2002 Dave G
wrote in from
(208.29.nnn.nnn)
You no listen well!!
"Light is faster than sound" You appear smart, until you open your mouth! The speed of sound is not 660 mph.. (and that's at sea level) 738 mph is the speed of sound! (at 0.00 altitude) oh.. the X-15 never went near the altitude you're speaking of ask another source!! Chuck Yeager X-1 pilot from here in West "By God" Virginia!!
I'm pullin' my reserve!
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Zoot Chute
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On 9/3/2002 Major Tom
wrote in from
(68.15.nnn.nnn)
Sound is still fast at high altitude...660+ mph even at X-15 altitude, 354,000 ft. With that chute we'd have people pulling the ripcord and busting a chute in your face at the bottom of a hill, instead of rudely busting a slide across your line, as now.
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speed..sound/light
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On 9/3/2002 Guru Gale
wrote in from
(208.29.nnn.nnn)
Ahhhh... It has been said , that "light, is faster than sound" I witness such, in that you appeared to be smart... til you open your mouth!!!
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Talking to yourself
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On 9/2/2002
Stubbs
wrote in from
(65.70.nnn.nnn)
Psycho
I got "tired head" from contemplating the same stuff. I don't think I'd get it unless I did it.
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just talking to myself...
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On 9/1/2002
psYch0Lloyd
wrote in from
(24.148.nnn.nnn)
OK, so if sound travels slower in higher altitudes and speeds up as it travels farther into the earths atmosphere but the opposite is true for a falling body, you can probably say something in a powerful sound system as you leap from your vehicle, then as you plummet you should hear what you said. Then again the rush of the wind will probably drown out any possibility of that...
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Speed
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On 9/1/2002 Stubbs
wrote in from
(65.70.nnn.nnn)
Very good points Chuck. I love all this talk of speed. I think the whole story, true speed of sound or not, is pretty killer. Going to go hit some downtown Dallas parking garages now. Thanks to all of you for your inspiring thoughts on my favorite skateboard trick: SPEED!!!!!!
SUAS!
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High altitude, speed of sound, etc.
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On 9/1/2002
Chuck
wrote in from
(204.32.nnn.nnn)
Some random thoughts on the matter:
At very high altitudes, the speed of sound is MUCH lower than the 600 - 700 or so mph we are accustomed to at or near sea level. Unfortunately any references I have which would tell the exacy speed of sound at 100,000 feet are at work.
At very high altitudes, the atmosphere is much thinner than at or near sea level, so air resistance is greatly reduced. Therefore, a free-falling person could go much faster than from, say, 4,000 feet.
Someone free-falling from 100,000 feet may very well "break the sound barrier", but given the altitude that is more of a "gee-whiz fact" than the very scary thought of attaining 700 mph in a free-fall.
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High altitude
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On 9/1/2002 Stubbs
wrote in from
(65.70.nnn.nnn)
Hig or high altitude. Whatever.
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Hig Altitude
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On 9/1/2002
Stubbs
wrote in from
(65.70.nnn.nnn)
I knew I did not dream that. THough you'l not get one single "told ya so" from me. I hardly believed it when I saw it on the tube. All I can say is WOW! Unreal!
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High Altitude Parachute Record
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On 9/1/2002 Historical Facts
wrote in from
(24.197.nnn.nnn)
http://www.pbs.org/wgbh/nova/escape/skydive.html
"On August 16, 1960, Joe Kittinger stood at the edge of his balloon's gondola, 19 and a half miles above the Earth's surface, and leapt out into the near vacuum of the stratosphere. Almost 14 minutes later he landed on solid ground."
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Parabrake
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On 9/1/2002
psYch0Lloyd
wrote in from
(24.148.nnn.nnn)
Stefan: Thanks for addressing my concerns. I am not a speedboarder and do not have hills such as your to experience such a need. I was just commenting from conjecture.
Stubbs: Me thinks that terminal velocity would hinder the skydiver from ever attaining such speeds. Or at least his/her limbs would have trouble not being ripped off by the wind resistance alone.
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Parabrake
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On 9/1/2002
Stefan
wrote in from
(62.73.nnn.nnn)
Thank you for telling your mind.
I designed this equipment cause of the street conditions here in my home town Rousse(Bulgaria).Streets are short and if you will do a fast run without smashing in a railroad barrier or stuff like this you should use that equipment.
This weekend I tested the Parabrake with 67km/h,it deployed smooth and braked me in 4sec.
Pull forces are slowed down, because I put a slider in the Parachute which slows deplying.So if you go fast the deployment goes smooth.Pulling forces aren't so strong to pull you off the board.
I think that it is usefull during a speedrun, you can brake down earlier if somthing goes wrong(but only on time).
If there is an oncoming car or a tree in the "horizon" you can catch the controlllines and controll it away.Or if the worst comes you can cut off it with a simple hand pull ,inside the belts.
At least when deployed it has around 3-5sec. to brake you down to 5km/h.The Parachute has a8,5 sq.m.
Check out the movies on http://x-treme2.hit.bg
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Speed of sound
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On 9/1/2002
Stubbs
wrote in from
(65.70.nnn.nnn)
"Luke" emailed me direct and got me thinking about my previous post and wanted to let anyone reading know that I was not delerious when I saw and heard this man, who is now in his 70s, talk about this. I will do some more research but I am sure I heard correct. Sorry again to get this discussion going on this site. I will follow up.
PS I am not some kook (well, maybe a small kook. he he)
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Para brake
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On 9/1/2002 Stubbs
wrote in from
(65.70.nnn.nnn)
I know this trails to another subject but speaking of documentaries, I saw another that involved a parachute. An Air Force pilot back in the 50's sky dived from a height close to 100,000 feet and on his way down he broke the sound barrier. No Sh*t. I only caught about 5 mins. of this but was sure of what I heard. Unreal. THe freakin' sound barrier!
Sorry to interject this but with all the talk of speed and g forces on this site I could not resist.
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Parabrake
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On 8/31/2002 ABS
wrote in from
(24.185.nnn.nnn)
Did anyone see "The Man Who Skiied Everest"?
I was'nt able to see Stefans invention. (just would'nt come up). But the guy who "skiied" everest had a "parabrake" as well.
Very funny. The guy stands near the top of everest, jumps up, points his skis downhill and goes into a full tuck!
Two seconds later he's going about mach 10, deploys his "parabrake", and then continues to get the living sh*t beat out of him for a couple thousand vertical feet.
If you've never seen this documentary, you should!
It was made in the '70's I think (maybe the '60's).
The guy was a Japanese kook.
Not sure where Stefan is from, but I'm thinkin "Sequal"!!
Hilarious.
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SLIDEGEAR
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On 8/30/2002
Leo
wrote in from
(199.82.nnn.nnn)
I Tested this beauties yesterday, i tried them without gloves and it was quite fun, i didnt touched the road with my fingers, they slide pretty nice, and are very conmfy, i will test them with my leather gloves, so far i love them!!!
cant wait to see the aditional part.
leo
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ParaBrake
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On 8/30/2002
psYch0Lloyd
wrote in from
(198.160.nnn.nnn)
Stefan Radev: I should be the last one to discourage innovative ideas but this concept adds another level of complexity to what should be a relatively simple activity. I could see it possibly being used if you were going for a speed record or something, but wonder if you would just be yanked off of your board. Another thing I would be concerned about is following someone who is rigged with a parachute or being anywhere in the immediate vicinity...
Now if you should get caught on a rigid object or a vehicle moving in the opposite direction (yikes), game's over!
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ParaBrake
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On 8/30/2002
Stefan Radev
wrote in from
(62.73.nnn.nnn)
http://ex2.hit.bg/Downhill/29.06.2002(Kostandenec)02.jpg
Hi to all longboarding/speedboarding enthusiasts,
My name is Stefan Radev and I'm a longboarder,paraglider,climber.
I'm writing you with reference to a problem which we all know-braking technics.We know those used braking methods,but they are sometimes dangerous and don't work properly and are hiding a risk to injure.
I solved that problem by designing a ParaBrake.It took me 4 years to develop and set it up to work properly on almost every downhill without failure.
Of course it has his positive & negative aspects:
Positive-you can deploy it whenever you want
-if your longboard starts wobbling you can deploy the ParaBrake to stop.
-you can use it on short for example and take as much time as possible to do your speed run.
-braking forces are soft and you can brake down from 45km/h to 6km/h in 4-6sec.
-the equipment is safe when used right.
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Negative-after each downhill you have to pack the Parabrake.It costs you about 10-15min.
-deploying on a turn is not recommendable,as the canopy(parachute) will pull you on one side when you go the opposite direction.
-before each downhill you have to know the wind direction.You always have to face the wind direction, weak side wind is acceptable.
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These are the things I wanted to tell you about that invention.
So what do you think about it, does it have any future.
P.S.Pictures/Videos of me using it can be seen on my webpage:
http://x-treme2.hit.bg
http://x-treme2.hit.bg/Videos.htm
Feel free to mail me your mind about it or if you want to know additional info.
Post your statements also on my forum on http://x-treme2.hit.bg
321Seeya!!!
Stefan Radev
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Sidlo's Sliders
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On 8/28/2002
hugh r
wrote in from
(205.216.nnn.nnn)
Pics of the proto-type Slidegear sliders... HR
Slidegear
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psycholoyd sliders
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On 8/24/2002
hugh r
wrote in from
(205.216.nnn.nnn)
I have a proto type of these new sliders... they fit over the hand or glove... very interesting design.
I'll get some pics up (hopefully today... gotta get my deep sea fishing tackle together, got an apointment with some baracuda early in the morning)
Hey I know skating is important and all, but were talking about fishing here! One of the other things that I'm not so good at but LOVE to do!! HR
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Wear too fast...
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On 8/22/2002 Duane
wrote in from
(68.15.nnn.nnn)
Then you bought a cheap cutting board. Order real UHMW HDPE from mcmaster.com, as almost all of the cutting boards out there now are injection molded plastic, which is definitely not UHMW. 10 fold difference in wear rates. Pro cutting boards are UHMW (like the ones that Teknor Apex makes), but don't expect that quality at K-mart
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