Subject:
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Re: A4 Class Locomotive teaser & Wheel count designations
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 26 May 1999 05:14:23 GMT
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Reply-To:
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johnneal@uswest.ANTISPAMnet
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Viewed:
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808 times
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<snip>
> The ludicrous extreme is a wagon plate that is equal in length to the diameter
> of a LEGO train circle!
Easy there, cowboy! I have built some 8 stud wide coaches (built over *2* wagon
plates) that practically *do* equal the length of the diameter of the circle.
*Looks* goofy going around the circle, and prototypically an engine could never
negotiate such a tight radius (at least a "C" config one), but they sure look cool
sitting on the track. I'm holding my breath for TLG to introduce flex track, so
that the angle of the curve is determined by the builder. Look, I'm turning blue
already;-)
-John
> Put the outer wheelsets at the ends of this way too
> long wagon plate with a central wheelset at the midpoint of the wagon plate.
> OK? Place this hypothetical way to long train on a LEGO train track circle:
> So, the two outer wheelsets are opposite one another across a diameter of the
> circle of track, and the middle wheelset is at a mid-point along a semi-circle
> of the circle of track. OUCH! The two end wheelsets are at 180 degrees with
> respect to one another (90 degrees with respect to the wagon plate; the wagon
> plate crosses a diameter of the circle of track.), and they are at 90 degrees
> with respect to the middle wheelset axle. A line drawn between an end wheelset
> and the central wheelset makes a 45 degree angle with respect to either axle.
>
> Now, think triangles: as the long wagon is put through the track curve,
> the central wheelset translates. This results in an increase in the
> axle-to-axle distance between the end wheelsets and the central wheelset. For
> the wagons I built using the ball-and-socket linkage, there was enough 'slop'
> in the ball-and-socket to accommodate this increased separation due to
> translation of the central wheelset. I'm not sure there would be enough slop
> in the ball-and-socket for an even longer wheelset separation.
>
> I now this is extreme, but it just shows what wheelset separation limitation
> may be encountered with the tri-axle ball-and-socket linkage as one tries to
> build longer and longer wagons.
>
> Give it a go! And, come up with something better! LEGO is so awesome for
> this means of mechanical exploration, creativity, and problem-solving.
>
> Sorry if my ramblings are unintelligible.
>
> Have fun! I'm looking forward to seeing this Great Brit. Loco. :-)
> later,
> James Mathis
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Message has 1 Reply:
 | | Re: A4 Class Locomotive teaser & Wheel count designations
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| (...) diameter (...) wagon (...) Sorry 'bout that. I can't think that big. Those are monster coaches! Wow! (...) never (...) cool (...) so (...) blue (...) If not flex track, I'd like to see the addition of a different (larger) radius of curve so (...) (25 years ago, 26-May-99, to lugnet.trains)
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Message is in Reply To:
| | Re: A4 Class Locomotive teaser & Wheel count designations
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| (...) I look forward to seeing it. (...) Correct: the two end wheelset pivot and the central wheelset translates perpendicular to the track. However, the central wheelset can actually pivot to some degree. I believe that the photos at my website (...) (25 years ago, 26-May-99, to lugnet.trains)
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