| Topic: |
Science > Physics |
| User: |
"Habshi" |
| Date: |
25 Jan 2004 12:01:31 PM |
| Object: |
Hovering to the roof |
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
What about a hovercraft with expandable skirt which can reach
the roof ?
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| User: "Edward Green" |
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| Title: Re: Hovering to the roof |
25 Jan 2004 06:52:01 PM |
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(Habshi) wrote in message news:<401403df.2751256@news.clara.net>...
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer .
Says you.
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| User: "Mark Martin" |
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| Title: Re: Hovering to the roof |
25 Jan 2004 10:41:38 PM |
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(Habshi) wrote in message news:<401403df.2751256@news.clara.net>...
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
What about a hovercraft with expandable skirt which can reach
the roof ?
What happens when you need the roof re-shingled? Will the roofer do
the whole job from the deck of a hovercraft, its motors burning away
the whole time? Not likely. A passive bridge between ground & roof
will continue to be in demand for quite some time into the foreseeable
future. So why not just invent a better, safer ladder? Fact is that a
rocket pack light weight enough to be worn will also be incapable of a
sustained hover for more than a scant few seconds. That's why the
personal strap on unit seen at sporting events continues to be nothing
more than a novelty item forty years after its invention.
-Mark Martin
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| User: "pragmatist" |
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| Title: Re: Hovering to the roof |
25 Jan 2004 04:33:33 PM |
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(Habshi) wrote in message news:<401403df.2751256@news.clara.net>...
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
What about a hovercraft with expandable skirt which can reach
the roof ?
Why don't you hook up with Abhi?
He thinks he has exactly what you are looking for.
Otherwise, use the ladder.
If a ladder worries you, you'd break your neck a whole lot quicker and
more enthusiastically with a jetpack.
Pragmatist
"It is impossible to idiot proof anything. Idiots are just so damned
creative!"
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| User: "Habshi" |
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| Title: Re: Hovering to the roof |
25 Jan 2004 04:49:12 PM |
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The point is , is it possible to have small flying craft which
can carry one to the roof , and which are cheap ? What about helium
balloons ? What about a rigid container made of very light materials
from which you would suck air out , and so it would float to the top ?
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| User: "Phil Holman" |
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| Title: Re: Hovering to the roof |
25 Jan 2004 05:33:08 PM |
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"Habshi" <habshi@anony.com> wrote in message
news:40144704.404792@news.clara.net...
The point is , is it possible to have small flying craft which
can carry one to the roof , and which are cheap ? What about helium
balloons ? What about a rigid container made of very light materials
from which you would suck air out , and so it would float to the top ?
Such a container has to be strong enough to resist collapse under
negative gauge pressure. Air is .076 lb/cuft so at half atmospheric
pressure you have less than .038 lb of structural material for every
cuft of container volume to resist a pressure of 7.35psi. A nice
optimization problem which reveals material in the unobtanium category.
Phil Holman
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| User: "Gregory L. Hansen" |
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| Title: Re: Hovering to the roof |
26 Jan 2004 10:29:50 AM |
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In article <40144704.404792@news.clara.net>, Habshi <habshi@anony.com> wrote:
The point is , is it possible to have small flying craft which
can carry one to the roof
Yes,
, and which are cheap ?
No.
What about helium
balloons ?
Not small.
What about a rigid container made of very light materials
from which you would suck air out , and so it would float to the top ?
You'd be better off with a helium balloon.
I'd thought of attaching counter-rotating rotors to a chair, powered by
whatever engine it would take. Counter-rotating to eliminate the need of
a tail rotor. But it's hard to fit many machine tools in a rented room.
--
Irony: "Small businesses want relief from the flood of spam clogging their
in-boxes, but they fear a proposed national 'Do Not Spam' registry will
make it impossible to use e-mail as a marketing tool."
http://www.bizjournals.com/houston/stories/2003/11/10/newscolumn6.html
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| User: "Mark Fergerson" |
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| Title: Re: Hovering to the roof |
26 Jan 2004 10:35:36 AM |
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Habshi wrote:
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
So put the roof at ground level. No ladder required.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
Thrust is limited. No "passenger" capacity. Also
controllability issues (understandably panicky rescuees
often must be knocked out so they don't injure/strangle the
rescuer).
What about a hovercraft with expandable skirt which can reach
the roof ?
Do you know anything about how hovercraft work? The skirt
would have to expand to the point it would lose lateral
stability and slide off the air cushion.
Mark L. Fergerson
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| User: "" |
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| Title: Re: Hovering to the roof |
26 Jan 2004 10:04:14 AM |
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In article <ClbRb.24$IF1.1@fed1read01>,
Mark Fergerson <nunya@biz.ness> wrote:
Habshi wrote:
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
So put the roof at ground level. No ladder required.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
Thrust is limited. No "passenger" capacity. Also
controllability issues (understandably panicky rescuees
often must be knocked out so they don't injure/strangle the
rescuer).
What about a hovercraft with expandable skirt which can reach
the roof ?
Do you know anything about how hovercraft work? The skirt
would have to expand to the point it would lose lateral
stability and slide off the air cushion.
Sigh! Go next door. Go upstairs. Look out the window.
Put a mirror on a stick that is longer than the height of
your roof.
Call your roof doctor.
Call your chimney doctor.
Ask a bird to look.
Hire a circus stick walker.
/BAH
Subtract a hundred and four for e-mail.
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| User: "Mark Fergerson" |
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| Title: Re: Hovering to the roof |
26 Jan 2004 05:13:29 PM |
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wrote:
In article <ClbRb.24$IF1.1@fed1read01>,
Mark Fergerson <nunya@biz.ness> wrote:
Habshi wrote:
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
So put the roof at ground level. No ladder required.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
Thrust is limited. No "passenger" capacity. Also
controllability issues (understandably panicky rescuees
often must be knocked out so they don't injure/strangle the
rescuer).
What about a hovercraft with expandable skirt which can reach
the roof ?
Do you know anything about how hovercraft work? The skirt
would have to expand to the point it would lose lateral
stability and slide off the air cushion.
Sigh! Go next door. Go upstairs. Look out the window.
Put a mirror on a stick that is longer than the height of
your roof.
Call your roof doctor.
Call your chimney doctor.
Ask a bird to look.
Hire a circus stick walker.
You don't get it. All your suggestions are too obviously
sensible for Habshi.
Mark L. Fergerson
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| User: "" |
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| Title: Re: Hovering to the roof |
27 Jan 2004 05:26:38 AM |
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In article <BahRb.72$IF1.63@fed1read01>,
Mark Fergerson <nunya@biz.ness> wrote:
jmfbahciv@aol.com wrote:
In article <ClbRb.24$IF1.1@fed1read01>,
Mark Fergerson <nunya@biz.ness> wrote:
Habshi wrote:
Recently heard a noise in the roof , which is quite high but
the problem is how to get up there and not fall off and risk a broken
neck , which would leave the world a lot poorer . Ladders are
dangerous.
So put the roof at ground level. No ladder required.
What about the jet backpacks shown in the LA Olympics . Put a
small one on the back or sit on a seat .Could rescue those on
skyscrapers .
Thrust is limited. No "passenger" capacity. Also
controllability issues (understandably panicky rescuees
often must be knocked out so they don't injure/strangle the
rescuer).
What about a hovercraft with expandable skirt which can reach
the roof ?
Do you know anything about how hovercraft work? The skirt
would have to expand to the point it would lose lateral
stability and slide off the air cushion.
Sigh! Go next door. Go upstairs. Look out the window.
Put a mirror on a stick that is longer than the height of
your roof.
Call your roof doctor.
Call your chimney doctor.
Ask a bird to look.
Hire a circus stick walker.
You don't get it. All your suggestions are too obviously
sensible for Habshi.
I didn't tell him about the more difficult methods ;-). I had
to identify the critter that was in my attic by the sound of
its attempts to come down through my ceiling (only
done right after I got into bed.
/BAH
Subtract a hundred and four for e-mail.
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| User: "Uncle Al" |
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| Title: Re: Hovering to the roof |
25 Jan 2004 03:16:52 PM |
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Habshi wrote:
Recently heard a noise in the roof ,
[snip]
One of your wog neighbors crapped in a ziplock and tossed it upwards.
What extremes will you pursue to step in it anyway?
http://www.mazepath.com/uncleal/effete4.png
--
Uncle Al
http://www.mazepath.com/uncleal/qz.pdf
http://www.mazepath.com/uncleal/eotvos.htm
(Do something naughty to physics)
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