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- From: abrown@hpcvcec.cv.hp.com (Allen Brown)
- Subject: Re: Table top Hovercraft know how wanted.
- Message-ID: <1992Nov23.202310.11523@hpcvca.cv.hp.com>
- Sender: nobody@hpcvca.cv.hp.com
- Nntp-Posting-Host: hpcvcec.cv.hp.com
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <8722@lee.SEAS.UCLA.EDU>
- Date: Mon, 23 Nov 1992 20:23:10 GMT
- Lines: 55
-
- yee@edison.seas.ucla.edu (John Yee) writes:
- > Hello robot builders, have you any experience making small, say 6" diameter
- > maximum, hovercraft? If so, please post/email your experiences.
- > jy, yee@seas.ucla.edu - "The man with no .sig"
-
- When we were in highschool a friend made the most incredible
- hovercraft. It consisted of four parts: an 0.049 engine with a
- conventional model propeller, a shoebox lid, a small piece of wood
- joining the former two parts, and a rudder.
-
- A flap was cut out of the shoebox to capture some of the wind from the
- prop. The engine was mounted to the wood so that it blew wind up
- about 30 degrees up from horizontal. There was no attempt to divide
- the skirt into chambers.
-
- This hovercraft went like a bat out of hell. There was a curve to its
- path. The rudder was never quite successful in straigtening it out.
- Perhaps if it had had RC that could have been solved. But considering
- how fast it went, few people would have been willing to risk their
- expensive RC devices. (This was years ago when none of us could
- afford RC.) One of the difficulties with this hovercraft was finding
- a suitable place to run it. It flew about 0.5 inch off the ground, so
- the surface had to be smooth. Grass is out of the question. And it
- traveled so fast that it needed a very large space to work in. We ran
- it on the asphalt playground of the nearby gradeshool. But it could
- only run for a few seconds before its path took it onto the grass. It
- would hit the grass and then go flipping thru the air about 10 feet.
- We then bent all the parts back into shape as best we could and tried
- it again.
-
- \-
- \ \ motor \
- \ \ here \
- \ wood \- \ flap
- \ \ \
- \ \ \
- --------------------------------------------------------------------
- | shoebox lid |
- | |
- --------------------------------------------------------------------
-
- This picture is only approximate. This was about twenty years ago so
- I may have forgotten some of the dimensions. I am not good enough
- with ASCII graphics to draw a motor and prop. But the angle of the
- motor is determined by the wood. As shown the flap would catch about
- 1/3 of the prop wash. The craft travels to the left. The prop wash
- is to the right and up.
-
- I have never gotten around to building another of these. But judging
- by how well the original worked, I would guess that the design is not
- very sensitive to the exact position of components. Enjoy!
- --
- Allen C. Brown abrown@cv.hp.com or hplabs!hpcvca!abrown or "Hey you!"
- Q: What did the Zen Buddhist say to the hot dog vendor?
- A: Make me one with everything.
-