Subject:
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Re: Technic prop
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 22 Dec 2005 18:59:12 GMT
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Viewed:
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9127 times
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In lugnet.technic, David Wegmuller wrote:
> In lugnet.technic, Steve Lane wrote:
> > Can someone who has this part
> >
> > http://www.bricklink.com/catalogItemPic.asp?P=2740c01
> >
> > please measure the radius described by the rotation of the blades and let me
> > know what it is.
> >
> > Thanks
> >
> > Steve
>
> Hi Steve,
> First I tried measuring its radius but this is not an easy task as the center
> point and the tip of the blades are on different planes. It looked like slightly
> less than 60mm but I could not tell for sure.
> So I built the test rig shown here: http://wegmuller.org/v-web/gallery/album06
> I found that the blade radius is indeed slightly less than 60mm (59.8 ~ 59.9mm)
> but there is a catch: the shaft holding the propeller and 24t gear into the 1x4
> beam has a lot of play which results in the propeller twisting around its axis
> which in turns results in a motion of several tenth of millimeters at the blade
> tips. The propeller clears the grey and yellow pieces in the pictures only if it
> is held flat against its 1x4 brick; if it is allowed to float, it will touch the
> grey and yellow pieces.
>
> I'm curious: what are you trying to build?
I'm intending to build a plane of WWII vintage although I'm not saying which one
yet as that would spoil the surprise. I'm going to build it to scale which is
why I need the accurate figure. The rest of the plane is going to be built in
the correct scale to match the Lego prop.
Thanks for the measurement, now I have an accurate figure I can begin to plan.
Steve
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Message is in Reply To:
 | | Re: Technic prop
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| (...) Hi Steve, First I tried measuring its radius but this is not an easy task as the center point and the tip of the blades are on different planes. It looked like slightly less than 60mm but I could not tell for sure. So I built the test rig (...) (21 years ago, 22-Dec-05, to lugnet.technic)
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