Subject:
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Re: hoovercraft with lift, thrust and steering
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 5 Mar 2003 06:53:33 GMT
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Viewed:
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3381 times
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In lugnet.technic, Paul Kleniewski writes:
>
> "Paul Krieg" <pdkrieg@epix.net> wrote in message
> news:HB6r15.ABG@lugnet.com...
>
> > After seeing the work of pixel I have been working some on rotor blades. • I
> > have been using axels for a frame and plastic cling wrap for a skin. The • cling
> > wrap will shink tight when a little heat is very carefuly applied. I use • the
> > tension created by the wrap to hold the frame together. That reduses the
> > weight of parts I need. At the scale you are working at is it possible to • use
> > flex tubing for blade structure?
>
> do you mean the profile
> the same as in plane wing
> i can imagine the application like this
>
> axle, tubing, space, axle
Well, my rotor blades are a bit big (about 12 x 36 L). They do not have the
profile of an actual airplane wing. They are made this way to save weight as
your hoover craft is. I did not use any flex tube at this time.
>
> this is the slice view (??? :) of wing
> and all of this surrounded by film as surface of our wing
I am considering two ways. I have the wrap only on the facing side of the
rotor blade and it is fixed to the axel frame with tape. I may try SEALING the
frame completely inside plastic shink film and then shrink it tight.
>
> two things
> 1. this application can be done as not too long
> 2. the problem of exploding rotor still stays
One way of preventing friction pins from coming loose at high rpm's is to put a
small antenna or pneumatic "T" etc. in the holes so it can't contract.
I have not tried anything with flex tubing. I thought perhaps their light
weight would help not only in overall weight reduction but that the forces
would act less on them so they would not fly out.
>
> and the main problem
> this application is really for plane wings
> not for propellers
> cause they have more sofisticated profile :(
I would think they are all similar. In real applications the all have a foil
shape designed to reduce drag and increase lift or thrust. I am far from being
an engineer, though.
>
> bu the idea is worth to remember
All are just ideas. I learn from the ones that don't work too. I will show
pics at Brickshelf when I have the means to make them. I've enjoyed your stuff
and many others very much.
Regards,
Paul
>
> regards
> pixel
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Message has 1 Reply:
 | | Re: hoovercraft with lift, thrust and steering
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| "Paul Krieg" <pdkrieg@epix.net> wrote in message news:HB9KH9.8H1@lugnet.com... (...) oh G! :) what motor will rotate it? it has to create much resistance on the air (...) but it could cause the hovercraft will rotate instead of propeller :))) (...) (24 years ago, 5-Mar-03, to lugnet.technic)
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Message is in Reply To:
| | Re: hoovercraft with lift, thrust and steering
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| "Paul Krieg" <pdkrieg@epix.net> wrote in message news:HB6r15.ABG@lugnet.com... (...) I (...) cling (...) the (...) use (...) do you mean the profile the same as in plane wing i can imagine the application like this axle, tubing, space, axle this is (...) (24 years ago, 4-Mar-03, to lugnet.technic)
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