Subject:
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RE: 8448 Street Sensation Racing - Are you game?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 30 Sep 1999 17:55:51 GMT
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Original-From:
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Tilman Sporkert <tilman@activesw.com&nomorespam&>
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Viewed:
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428 times
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The problem with the 8448 is that the Lego motor is not powerful enough to
do any "racing", or take advantage of the gear box. If you use a single
motor and a battery box, then the 8448 moves rather slowly on smooth
surfaces only. If you shift the gears up, the Lego motor simply slows down
under the higher load, and the speed of the car remains pretty much the
same. Using an RCX as the power source makes it even worse - there's less
output voltage available than straight from a battery box. It might be a
little better using two motors.
I've been thinking about using the 8448 as a base for a RCX controlled car
myself. There are two things that slow it down. First, there's the
decorative V8 engine in the front. Then there's the gear box. There's a lot
of friction in it. I would disconnect the gear box and V8 motor, and drive
the rear axle differential directly with the motor. An electric motor in
general does not benefit from a switchable mechanical gear box. You will
notice that electrically driven vehicles (train engines, golf carts) usually
don't have a such a thing. If you want the front engine to keep spinning,
use a second motor just to drive that part of the gear train.
Chances are that the winner of your race is the one with the best "follow
the line" algorithm.
Tilman
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