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)

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

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.

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.

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

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

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.

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)

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

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