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#1
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Propeller or jet to push an in-line skater?
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. Anybody know about Everglades/marsh air powered boats? Maybe I should do a little research on that one. One thing for sure, if there ever is such a thing as a jetpack, it will very easily push an in-line skater before it will lift a person off of the ground. Thanks. -- (Crossposted, please feel free to remove the other group) |
#2
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Propeller or jet to push an in-line skater?
On 7/21/2010 7:57 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? 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. Anybody know about Everglades/marsh air powered boats? Maybe I should do a little research on that one. One thing for sure, if there ever is such a thing as a jetpack, it will very easily push an in-line skater before it will lift a person off of the ground. Thanks. Jet thrust stays pretty constant with speed. But Horse Power increases with speed for constant thrust. Which is a fancy way of saying jets are inefficient at slow speeds, but efficient at high speeds. Anyway, think about 5 to 10 pounds of thrust per horse power at skating speeds. Brian W |
#3
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Propeller or jet to push an in-line skater?
In article ,
brian whatcott wrote: On 7/21/2010 7:57 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? 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. Anybody know about Everglades/marsh air powered boats? Maybe I should do a little research on that one. One thing for sure, if there ever is such a thing as a jetpack, it will very easily push an in-line skater before it will lift a person off of the ground. Thanks. Jet thrust stays pretty constant with speed. But Horse Power increases with speed for constant thrust. Which is a fancy way of saying jets are inefficient at slow speeds, but efficient at high speeds. Anyway, think about 5 to 10 pounds of thrust per horse power at skating speeds. Brian W 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. -- Remove _'s from email address to talk to me. |
#4
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Propeller or jet to push an in-line skater?
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? Is it louder than a gas powered weedeater? Just curious. |
#5
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Propeller or jet to push an in-line skater?
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. -- Richard Lamb |
#6
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Propeller or jet to push an in-line skater?
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 |
#7
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Propeller or jet to push an in-line skater?
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. |
#8
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Propeller or jet to push an in-line skater?
On Jul 22, 10:57*am, 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? Not far fetched, just very pointless. Simply decide if you want digits chopped of by propellor or scorched of by model jet engine after loosing control and suffering concusion. It should be a few laughs if the dudsons peform it or jackass does it. |
#9
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Propeller or jet to push an in-line skater?
Eunometic eunometic yahoo.com.au wrote:
John Doe j... usenetlove.invalid wrote: How far-fetched is the idea, to use a propeller or jet engine (radio controlled type?) to push an in-line skater? Not far fetched, just very pointless. Pointless, like Google Groups access to UseNet. Simply decide if you want digits chopped of by propellor or scorched of by model jet engine after loosing control and suffering concusion. It should be a few laughs if the dudsons peform it or jackass does it. Have you ever designed and built anything? Anything to show? No, of course not. Because your imagination suffers. In fact, it has been done (by a guy from Australia for one, BTW). There are videos of others testing it there too. -- See also Google Groups Path: news.astraweb.com!border5.newsrouter.astraweb.com! npeer02.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!postnews.google.com!x20g2000pro.googlegr oups.com!not-for-mail From: Eunometic eunometic yahoo.com.au Newsgroups: rec.aviation.military,rec.aviation.homebuilt Subject: Propeller or jet to push an in-line skater? Date: Wed, 21 Jul 2010 21:32:25 -0700 (PDT) Organization: http://groups.google.com Lines: 12 Message-ID: 4702821e-bc8f-4061-9d8e-70ba99ec3235 x20g2000pro.googlegroups.com References: 4c479785$0$4752$c3e8da3 news.astraweb.com NNTP-Posting-Host: 120.156.158.227 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1279773145 5464 127.0.0.1 (22 Jul 2010 04:32:25 GMT) X-Complaints-To: groups-abuse google.com NNTP-Posting-Date: Thu, 22 Jul 2010 04:32:25 +0000 (UTC) Complaints-To: groups-abuse google.com Injection-Info: x20g2000pro.googlegroups.com; posting-host=120.156.158.227; posting-account=pe16VAkAAABnsxp6e3seFLCKB64wnHAV User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.5; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729),gzip(gfe) |
#10
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Propeller or jet to push an in-line skater?
"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 :-) -- Remember Altitude is more important than Attitude |
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