 | | "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Ok, so we have the 4, 3 and 2 (LegWay :) wheel bots... and the 8, 6, 3, 2, 1(?) leg BOTs. ...but, what about a 0 (zero) Wheel / Leg Bot ? Ok, there's the pseudo-flying bots :)) but, apart from some trials with blimps (helium balloons?) and (...) (21 years ago, 26-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) I'd be interested in knowing how this works. The ZNAP green helicopter set (which I got three of last year at $9 each!) had some little round turbine-like parts, basically a ducted fan. Never tried them out to see if they're actually (...) (21 years ago, 26-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Hi Chris, :) (...) I have that set. That was one of the first tests I did when I got it. It's my only ZNAP set. I bought it because of the motor, the flex and those wheel/"turbine". From what I remember, it doesn't work that well. It's too tiny. It (...) (21 years ago, 26-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) The experiments we've done with the helicopter suggest that you can generate some pretty impressive volumes of fairly slow moving air - but high speed/low volume is hard. The RDS insect wings that we used on our helicopter work really well, (...) (21 years ago, 26-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Actually they don't. You can create a hovercraft that will lift an ordinary adult (say <200lb US) using nothing more than a half sheet of plywood, a 1/4HP vacuum cleaner motor, a shower curtain, some tape, a bunch of 1" washers to keep the (...) (21 years ago, 26-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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A ducted fan approach may work. Ducted fan hovercraft have one or two big fan blades on the back that push the craft forward, but a duct takes some of the air and uses it to fill the skirt. This is probably the "lightest" design approach. Direction (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Basic LCAC design. The air that drives the skirt is -not- derived from the direction fans but rather from the turbine input plenums (those babies will suck as much air in just a few 10's of sec. as goes through your entire house in year). If (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) That was the SRN1 - the worlds first working full-sized hovercraft - which (amazingly) didn't have a skirt. You can see a picture of it here: (URL) Steve Baker ---...--- HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com> HomePage (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Several of the original hovercraft didn't have skirts, they were the running board sitting on the ground. There is a simple childrens science experiment to demonstrate the effect. Take a sewing thread spool (the old wood kind work best) and (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Hi Rob :) (...) Yes, I *think* that's the only way. (...) That's my first approach. I'll deal with motion next. (...) 100% LEGO yes, but I'm planning on using LEGO (maybe ZNAP at first, then a mix of Technic) as the "wire-frame" and then use plastic (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) (URL) is a nice project, they built a human-powered hovercraft that was just able to lift a person from the ground. I read a dutch article on it, they also refer to a few books on hovercraft design. (...) The project above uses styrofoam to (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Hi, I'm not sure whether this would work or not but one possibility is using an inner tube from a mountain bike tyre. They are strong, reasonably light and look to be just the right size. Also small holes could be made on the inside of the (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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There was an excellent episode of JunkYard Wars where they demonstrated just how easy, relatively speaking, it is to build a hovercraft. (URL) Now piloting it once it's built, there's the tricky part... Dan Novy Technical Supervisor Flash Film (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Hi Dan, (...) ok, I think that now everyone knows that I like hovercrafts... never had one... but then, I always liked helicopters and never had one also. hmmm... I just remembered I have a cpu cooling fan laying around... maybe... well, it's (...) (21 years ago, 27-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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While doing my initial searches to check if this could be done, I found this: (URL) a look at this: "What is the coolest model you have ever built? Apart from the destroyer I mentioned above, I think that the coolest models I have made are the (...) (21 years ago, 28-Nov-02, to lugnet.robotics, lugnet.lego.direct)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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no! cpu fan doesn't work in this aplication even if you increase voltage 2 times pixel "Marco Correia" <lego-robotics@crynwr.com> wrote in message news:000a01c2963b$e3...rcel.pt... (...) maybe... (...) also. (...) (21 years ago, 28-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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pixel wrote (...) yup, I confirmed that yesterday :/ though now I have a nice ZNAP micro ventilator, for the hot summer, ehehe now... let's see what happens tonight, with the 9v ungeared LEGO motor and a non-LEGO propeller together with an "air (...) (21 years ago, 28-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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if i will use non lego or znap propeler will you disqualificate me? :) be cause IMO some kind of turbine is needed here i'll try to do it tonight (21 years ago, 28-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) LOL! No ! I myself am doing tests with a non-LEGO one also. it would be nice if it could use a LEGO motor... and material usually found in every home, so anyone could build one... if we ever find a way to make it possible. (...) Yep. Do you (...) (21 years ago, 28-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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hi! so i did tests and my discoveries are sad 1. pure turbine has to be placed in some kind of tunnel but not exactly funnel the tunnel has to be as a part of ball (sphere) without hats :)) at the upper and the lower side because the stream of air (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Bingo. (...) Take a look at some of these micro motors that are being used in the new mini-RC cars. You can buy a whole car kit, radio, and controller for about $75US. (...) A helo tail rotor is your best bet. Wood or a composite is your best (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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but wher is the fun? my skirt has been done as a cut of the sphere the same shapa as the tunnel has to hav (i think) so it was a middle part of sphere without upper and lower domes that's why i said "a little bit hard to do it" :)) you said CD is (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) The micro cars (the ones about an inch long) are down to $30 - including two channel RC and battery charger. However, the motors aren't all that powerful. I read somewhere that the motors they are using are from the 'vibrators' inside pagers (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) Non-lego motor -- for lower weight and higher RPM. Non-lego skirt -- because there isn't anything in Lego that can do that. Non-lego propellor -- because the Lego ones are crap Non-lego decking -- for lightness and rigidity. ...hmmm it's (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) to how to do it... After work I'm going home and rip apart my modified 8448, take the 8475 motors out of it, and throw on a znap prop on those motors and see what the air flow's like. Putting my current project on hold, I'll try and whip (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) When I was about to give up, after some tests with a non-LEGO propeller and *without* a "skirt", I saw this interview of LEGO Master Builder Hans Madsen ((URL) where he says he made one (I assume) *LEGO* "Hovercraft that really flies": "What (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | RE: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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Hi Dave :) (...) Cool :) (...) I'm thinking of a thin "plastic film" usually used to wrap around food to keep it fresh and air tight (I don't know how's it called in english). mc. (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) You'll have to answer that for yourself. A lot of what I find fun would probably bore/scare most to death. For example, I find all these transformers and such that a lot of Mindstorm folks rave over completely and utterly uninteresting, and (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) I was thinking of more a complete LEGO solution--the only thing non-LEGO in my plans is the skirt, which probably will be a bicycle innertube. What I plan first is to get hte motor, the fan and turn it on and see if I can dry my hair with it (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) We aren't interested in power, we're interested in moving a volume of air. They are very fast, high rpm. Trade off rpm with suitable gearing. You may need two or more (which is why small may be better). I've never used them myself except for (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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(...) So is Hans Madsen on this list? I'm always skeptical of things that are just throwaway lines like that...was this pure lego? How much cheating was involved? There was a couple of photos of a lego helocopter that could really fly on the list a (...) (21 years ago, 29-Nov-02, to lugnet.robotics)
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| | Re: "real" LEGO Hovercraft ? (with/without batteries/RCX "onboard")
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"Jim Choate" <lego-robotics@crynwr.com> wrote in message news:Pine.LNX.4.33.0...ssz.com... (...) no comments man! i've been asking rhetotical :)))) i've got fun experimenting even if i know they lead to nowhere (...) what is with your sense of (...) (21 years ago, 30-Nov-02, to lugnet.robotics)
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