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#11
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Propeller or jet to push an in-line skater?
"Garry O" wrote in message u... "John Doe" wrote in message ... Dan wrote: cavelamb wrote: John Doe wrote: Orval Fairbairn o_r_fairbairn earth_link.net wrote: The model airplane guys have a very small (about 15" long, 5" dia) turbojet that they use on scale jet R/C planes. It costs about $3000 US. How much for maintenance and fuel? It burns a quart of fuel in a minute or minute and a half. Is it louder than a gas powered weedeater? Just curious. Deafening. 100,000 RPM with every harmonic ever invented. I think they missed the lower sub harmonics, but who can hear over that racket? Dan, U.S. Air Force, retired http://www.youtube.com/watch?v=FxT5H...eature=related Some backpack fan powered paragliding. Looks like so much fun, but dangerous. -- Thanks to the replies. I would imagine less dangerous than trying to in-line skate with one of those things on :-) There was a rocket powered roller skater back in the 70's http://www.the-rocketman.com/capt-rollerball.html Keith |
#12
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Propeller or jet to push an in-line skater?
"Garry O" wrote in
u: "John Doe" wrote in message ... Dan wrote: cavelamb wrote: John Doe wrote: Orval Fairbairn o_r_fairbairn earth_link.net wrote: The model airplane guys have a very small (about 15" long, 5" dia) turbojet that they use on scale jet R/C planes. It costs about $3000 US. How much for maintenance and fuel? It burns a quart of fuel in a minute or minute and a half. Is it louder than a gas powered weedeater? Just curious. Deafening. 100,000 RPM with every harmonic ever invented. I think they missed the lower sub harmonics, but who can hear over that racket? Dan, U.S. Air Force, retired http://www.youtube.com/watch?v=FxT5H...eature=related Some backpack fan powered paragliding. Looks like so much fun, but dangerous. -- Thanks to the replies. I would imagine less dangerous than trying to in-line skate with one of those things on :-) this powered-skater thing reminds me of the rocket-powered street luge. (used Aerotech APCP rocket motors.) -- Jim Yanik jyanik at localnet dot com |
#13
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Propeller or jet to push an in-line skater?
On Jul 22, 8:49*am, Jim Yanik wrote:
"Garry O" wrote .au: "John Doe" wrote in message . .. Dan wrote: cavelamb wrote: John Doe wrote: Orval Fairbairn o_r_fairbairn earth_link.net wrote: The model airplane guys have a very small (about 15" long, 5" dia) turbojet that they use on scale jet R/C planes. It costs about $3000 US. How much for maintenance and fuel? It burns a quart of fuel in a minute or minute and a half. Is it louder than a gas powered weedeater? Just curious. Deafening. 100,000 RPM with every harmonic ever invented. I think they missed the lower sub harmonics, but who can hear over that racket? Dan, U.S. Air Force, retired http://www.youtube.com/watch?v=FxT5H...eature=related Some backpack fan powered paragliding. Looks like so much fun, but dangerous. -- Thanks to the replies. I would imagine less dangerous than trying to in-line skate with one of those things on :-) this powered-skater thing reminds me of the rocket-powered street luge. (used Aerotech APCP rocket motors.) -- Jim Yanik jyanik at localnet dot com The whole concept sounds like a qualification entry for a Darwin Award. Dean |
#14
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Propeller or jet to push an in-line skater?
On Jul 21, 8:57*pm, John Doe wrote:
How far-fetched is the idea, to use a propeller or jet engine (radio controlled type?) to push an in-line skater? ... Diesel engines with treads: http://blog.modernmechanix.com/mags/...ead_skates.jpg jsw |
#15
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Propeller or jet to push an in-line skater?
Dean damarkley gmail.com wrote:
Jim Yanik wrote: "Garry O" wrote "John Doe" wrote Dan wrote: cavelamb wrote: John Doe wrote: Orval Fairbairn o_r_fairbairn earth_link.net wrote: The model airplane guys have a very small (about 15" long, 5" dia) turbojet that they use on scale jet R/C planes. It costs about $3000 US. How much for maintenance and fuel? It burns a quart of fuel in a minute or minute and a half. Is it louder than a gas powered weedeater? Just curious. Deafening. 100,000 RPM with every harmonic ever invented. I think they missed the lower sub harmonics, but who can hear over that racket? http://www.youtube.com/watch?v=FxT5H...eature=related Some backpack fan powered paragliding. Looks like so much fun, but dangerous. I would imagine less dangerous than trying to in-line skate with one of those things on :-) It would be a riot, somewhere around 250 cc I guess, apparently more than necessary. Also maybe too heavy. this powered-skater thing reminds me of the rocket-powered street luge. (used Aerotech APCP rocket motors.) The whole concept sounds like a qualification entry for a Darwin Award. I have many years experience inline street skating, and designing and building stuff. Street skating, on narrow or uneven sidewalks, up and down curbs, and on rough streets presents a unique opportunity for invention. Sail powered skating would be good if not for the restriction of movement, that is similar to ordinary pushing. Propeller powered skating is attractive because of surface traction difficulties. There would be no need to pull something, like a push stick, up a curb. Flexibility in motion is a great asset of rough street skating, and propeller power would allow for excellent freedom of motion. I mainly need to know how propeller power compares to ordinary motor and wheel against the ground propulsion. -- See also Google Groups Dean |
#16
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Propeller or jet to push an in-line skater?
Jim Wilkins wrote:
John Doe wrote: How far-fetched is the idea, to use a propeller or jet engine (radio controlled type?) to push an in-line skater? ... Diesel engines with treads: http://blog.modernmechanix.com/mags/...ead_skates.jpg Thanks for the picture. Sloping upwards in front would help too. I have mentioned that possibility with my big front wheel skates, but had not seen any attempt like that. Skating over rough terrain has many possibilities. http://www.flickr.com/photos/27532210@N04/3056505603/ -- jsw |
#17
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Propeller or jet to push an in-line skater?
John Doe wrote:
Dean damarkley gmail.com wrote: Jim Yanik wrote: "Garry O" wrote "John Doe" wrote Dan wrote: cavelamb wrote: John Doe wrote: Orval Fairbairn o_r_fairbairn earth_link.net wrote: The model airplane guys have a very small (about 15" long, 5" dia) turbojet that they use on scale jet R/C planes. It costs about $3000 US. How much for maintenance and fuel? It burns a quart of fuel in a minute or minute and a half. Is it louder than a gas powered weedeater? Just curious. Deafening. 100,000 RPM with every harmonic ever invented. I think they missed the lower sub harmonics, but who can hear over that racket? http://www.youtube.com/watch?v=FxT5H...eature=related Some backpack fan powered paragliding. Looks like so much fun, but dangerous. I would imagine less dangerous than trying to in-line skate with one of those things on :-) It would be a riot, somewhere around 250 cc I guess, apparently more than necessary. Also maybe too heavy. this powered-skater thing reminds me of the rocket-powered street luge. (used Aerotech APCP rocket motors.) The whole concept sounds like a qualification entry for a Darwin Award. I have many years experience inline street skating, and designing and building stuff. Street skating, on narrow or uneven sidewalks, up and down curbs, and on rough streets presents a unique opportunity for invention. Sail powered skating would be good if not for the restriction of movement, that is similar to ordinary pushing. Propeller powered skating is attractive because of surface traction difficulties. There would be no need to pull something, like a push stick, up a curb. Flexibility in motion is a great asset of rough street skating, and propeller power would allow for excellent freedom of motion. I mainly need to know how propeller power compares to ordinary motor and wheel against the ground propulsion. since you have experience in designing and building stuff, why not just and do and report back. If you can... Dean nailed it. -- Richard Lamb |
#18
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Propeller or jet to push an in-line skater?
cavelamb cavelamb earthlink.net wrote:
John Doe wrote: Dean damarkley gmail.com wrote: Jim Yanik jya... abuse.gov wrote: "Garry O" ifuneedituwillge... home.com wrote "John Doe" j... usenetlove.invalid wrote Dan B24... aol.com wrote: cavelamb wrote: John Doe wrote: Orval Fairbairn o_r_fairbairn earth_link.net wrote: The model airplane guys have a very small (about 15" long, 5" dia) turbojet that they use on scale jet R/C planes. It costs about $3000 US. How much for maintenance and fuel? It burns a quart of fuel in a minute or minute and a half. Is it louder than a gas powered weedeater? Just curious. Deafening. 100,000 RPM with every harmonic ever invented. I think they missed the lower sub harmonics, but who can hear over that racket? http://www.youtube.com/watch?v=FxT5H...eature=related Some backpack fan powered paragliding. Looks like so much fun, but dangerous. I would imagine less dangerous than trying to in-line skate with one of those things on :-) It would be a riot, somewhere around 250 cc I guess, apparently more than necessary. Also maybe too heavy. this powered-skater thing reminds me of the rocket-powered street luge. (used Aerotech APCP rocket motors.) The whole concept sounds like a qualification entry for a Darwin Award. I have many years experience inline street skating, and designing and building stuff. Street skating, on narrow or uneven sidewalks, up and down curbs, and on rough streets presents a unique opportunity for invention. Sail powered skating would be good if not for the restriction of movement, that is similar to ordinary pushing. Propeller powered skating is attractive because of surface traction difficulties. There would be no need to pull something, like a push stick, up a curb. Flexibility in motion is a great asset of rough street skating, and propeller power would allow for excellent freedom of motion. I mainly need to know how propeller power compares to ordinary motor and wheel against the ground propulsion. since you have experience in designing and building stuff, why not just and do and report back. Possible, but I would post the results in the skating group. If you can... Apparently you are choosing to troll before reading. It has already been done, and tested. Dean nailed it. Says a silly troll? Simply saying someone/something is "stupid" is the lamest insult known to mankind. -- -- Richard Lamb Path: news.astraweb.com!border5.newsrouter.astraweb.com! news.glorb.com!news2.glorb.com!news.glorb.com!Xl.t ags.giganews.com!border1.nntp.dca.giganews.com!nnt p.giganews.com!local2.nntp.dca.giganews.com!nntp.e arthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 22 Jul 2010 17:18:55 -0500 Date: Thu, 22 Jul 2010 17:18:30 -0500 From: cavelamb cavelamb earthlink.net User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) MIME-Version: 1.0 Newsgroups: rec.aviation.military,rec.aviation.homebuilt,free. UseNet Subject: Propeller or jet to push an in-line skater? References: 4c479785$0$4752$c3e8da3 news.astraweb.com l6OdnXpB6OmOPNrRnZ2dnUVZ_q2dnZ2d giganews.com o_r_fairbairn-E87157.23144421072010 70-3-168-216.pools.spcsdns.net 4c47bb7a$0$8726$c3e8da3 news.astraweb.com _qednaqEVc1sIdrRnZ2dnUVZ_tCdnZ2d earthlink.com obadnZyJBemBXdrRnZ2dnUVZ_jidnZ2d giganews.com 4c47c204$0$9831$c3e8da3 news.astraweb.com 4c4827f6$0$14497$afc38c87 news.optusnet.com.au Xns9DBD59E431D62jyaniklocalnetcom 216.168.3.44 12d84862-6957-4c46-9aee-2701863013ba l14g2000yql.googlegroups.com 4c48a6f2$0$21146$c3e8da3 news.astraweb.com In-Reply-To: 4c48a6f2$0$21146$c3e8da3 news.astraweb.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Message-ID: esWdnY4-doRSXtXRnZ2dnUVZ_rednZ2d earthlink.com Lines: 64 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 96.18.15.71 X-Trace: sv3-W77f3Gdi2ymFR1gSvUptEil69uKER+YaHraflZLqNI2uTJt4nJ l1JZ/L5I20kS5dSAgUCxzlHGr46gu!bmVlICaL7wJUIZEcu//eq7yXM6jbQtA+yBmhTB+vFzvqJiko88NmqX8R1gHR8cGWY11MP kB1d0RI!n4FjBrSu/CcFdMYx0oOKtMcvaVPZYZU= X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 |
#19
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Propeller or jet to push an in-line skater?
On Jul 22, 9:31*am, Dean wrote:
... The whole concept sounds like a qualification entry for a Darwin Award. Dean The perpetrator of the car embedded in the cliff posted the full story once on rec.crafts.metalworking. No one was injured, the rocket car was rolling unmanned down an old mining railroad at maybe 60 MPH and when their crude brakes failed it slid into the tunnel entrance, which collapsed on it. The skid marks at the corner are from when they bugged out afterwards, they are actually from driving full-throttle onto the pavement from the sand. They had plowed the sand off the tracks and it probably blew back and hid them before the wrecker arrived. jsw |
#20
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Propeller or jet to push an in-line skater?
In article ,
John Doe wrote: How far-fetched is the idea, to use a propeller or jet engine (radio controlled type?) to push an in-line skater? How does aircraft takeoff thrust compare to using a conventional motor and wheel to push oneself along the ground? What sort of incline would be achievable at say a skater weight of about 160 pounds? I think the rolling resistance can be assumed to be zero or maybe the same as a small aircraft. Years ago (maybe late 1990s) one of those 'whacky invention' type TV shows featured a guy with jet engines mounted on the tails of his skis. No need for a chair lift, he'd just ski uphill. So it has been done, just make sure your life insurance is paid up. John -- John Clear - http://www.clear-prop.org/ |
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