Robotics : 19663


Robotics / 19663	19662 \| 19664

Subject:	RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
Newsgroups:	lugnet.robotics
Date:	Fri, 29 Nov 2002 17:04:58 GMT
Original-From:	PeterBalch <peterbalch@compuserve.comNOSPAM>
Viewed:	859 times

I just tried a 5V processor cooling fan a 12V computer PSU cooling fan a 3V ducted fan of the sort used to cool your face (run at 5V without on-board batteries) with a 16cm dia polystyrene plenum. None could really lift their own weight - although the processor cooling fan just became a little easier to move. Peter

Message has 2 Replies:

		RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
(...) Get rid of this fixation with 'lift own weight' (you're -completely- ignoring the -primary- factor of time). Consider the exhaust of a car, pump it into a bag and you can lift the car to change the tire but you can stop the car by simply (...) (22 years ago, 29-Nov-02, to lugnet.robotics)

		Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
(...) I think you need a MUCH bigger area under the craft. If all the motors and stuff on top weighed (say) 100 grams, and you have just 16cm diameter skirt then you need a pressure of: 0.1 / (PI x 0.008 x 0.008 ) kilograms/square meter ...in order (...) (22 years ago, 29-Nov-02, to lugnet.robotics)

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