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I have this part (from <set:8855>) and I have been unsuccessful in my attempts to power it to any significant speed. The problem is that the prop and z24 gear are permanently molded to a 3L axle which goes through a 1x4 Technic beam. Having only one (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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Ho Mark, This presents a significant problem. I always engineer my gear-trains to include a double "axle grab" on both sides of a gear so the gears flow smoothly. Without that extra stud worth to help anchor the Airscrew, yep could be a problem. But (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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(...) I agree, it even causes a problem when used in the actual set! IMO this is one of the worst LEGO parts ever. ROSCO (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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You inspired me to tinker a bit, but I am still unsuccessful. Putting gears around the z24 to help stabilize it is problematic because, at standard LEGO distances, there is sufficient space between the gears to allow the z24 (and the prop axle) to (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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(...) What about attaching another 24t along the same axis with a friction pin, then having an axle in that? You'd probably need to drive both to stop rotation at the friction pin. ROSCO (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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Question: Since I don't know what the z24 exactly looks like on the prop, is it just like the regular gear? Reason I say, I'm curious, because you could use the holes on the gear to pin another z24 to it and then you'd have a place to mount another (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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(...) No, it only has one pin hole, and no axle holes. Why LEGO decided to do it that way I can't imagine - all previous sets (AFAIK) used the offset axle holes (present in the old 24t gears) to connect pistons, not the pin holes. IMO that part is a (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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Yes, I had tried that. I was unable to prevent all the rotation at the friction pin, and even a small amount of movement there caused significant wobble/binding. Mark Haye "Ross Crawford" <rcrawford@csi.com> wrote in message (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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(...) Have you considered using lubricant between the 1x 4 beam and axle? I know I did, many times, but never got around to do it. Do you think it might reduce the friction enough? (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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How about inserting the 24T gear into half a large turntable, and securing the other end of the turntable using axles. I know this gets very large where you don't want to get large, but it might provide stability in ways the other solutions do not. (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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(...) Well I did a little test, heres the pics: (URL) that the propeller shaft is cylindrical, not "x" axle-shape, so friction is much greater than standard axle. It worked reasonably well, even with no lubrication and old batteries. I reckon with (...) (22 years ago, 7-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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(...) Nice design. Oh man, the design of the 24t gear at the back of this propeler is realy lame. That whole part is very un-legoish. 1) Perhaps you could use the old friction connector instead of the new one: i.e. part 4459 instead of part 2780. (...) (22 years ago, 8-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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You guys are bound and determined to spend my whole weekend tinkering on this, aren't you? ;-) I reproduced Ross's setup using a gray peg, a black friction peg, and an old black friction peg. I still get what I consider pretty poor performance (with (...) (22 years ago, 8-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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"Mark Haye" <markhaye@netzero.net> wrote in message news:HA05tr.EJx@lugnet.com... (...) Offcourse, we dont give up before we have succeeded :) I'm just been bitten of this LEGO-flying machine virus .... (...) old (...) hit (...) Whatever speed you (...) (22 years ago, 8-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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Here are photos of my most effective props until now. (URL) Steinnes (URL) (22 years ago, 9-Feb-03, to lugnet.technic)
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| | Re: Props for Hovercraft
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(...) friction pin, (...) Perhaps the z24-sandwich can be wrapped with conveyor chain links? /Tobbe (22 years ago, 10-Feb-03, to lugnet.technic)
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