Subject:
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Re: 8475
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 22 Aug 2002 14:41:30 GMT
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Viewed:
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2560 times
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In lugnet.technic, John Barnes writes:
> 8475 RC Race Buggy – A quick initial review
>
> This is a 27 MHz remote control vehicle set. It isn’t called Technic, but it
> is primarily composed of Technic parts, some new, at least to me.
> ...
I just want to add that I've only seen two of these, and they both had a
minute problem with centering the steering.
A full proportional system has a trim setting on the transmitter, since the
signal is constantly sent all the time the transmitter is on. With this
system, the signal is only sent when you move a control (the clue is that
the controller has no 'off' switch), and three positions left or right is
not enough to do accurate trimming over-the-air.
There is a trim control on the steering block itself, but that does very
little. On it's own, it alters the spring-centered position of the steering
(and it's not rack and pinion, it's just a crank lever). However, connect
it to the steering servo built into the receiver, and the spring-centering
becomes irrelevant. If the servo doesn't center exactly, the steering will
be slightly off regardless of the trim setting.
The problem comes when the servo centers itself. Move the stick to the
right and release, and it centers perfectly. Move it to the left and
release, and it can over-compensate and end up slightly over to the right.
You only notice it though over a long distance.
Having said that, it's only a tiny effect and I'd still recommend the set
even if they all do it. The extra channel for controlling your own motor or
lights is a fantastic touch. Mine has a red/blue flashing bar, two spots
and a siren!
I presume the whole thing is done by transmitting a single byte of data -
three bits for left/right, three for forward/back and two for switching the
auxilliary 9V supply to +/0/-.
It's just a shame that the only parts in the whole set that have actual Lego
studs on them are the 9V connecters...
Jason J Railton
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Message has 2 Replies:
 | | Re: 8475
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| I'm pretty not happy with the steering centering myself. I can't get mine to center no matter what I do. Oh well, I only bought the set for the motors anyway. -Rob hmm...New motor...Rail Racer 2003...hmmm "Jason J Railton" <j.j.railton@ntlworld.com> (...) (22 years ago, 22-Aug-02, to lugnet.technic)
| | | Re: 8475
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| I am pretty cluless about lights, sirens... Can anyone (Jason?) recommend either a good set that has lights and/or sirens compatible with the 9V on the 8475 or even individual bricks from BrickLink? Thanks in advance. Laurent (...) (22 years ago, 4-Jan-03, to lugnet.technic)
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Message is in Reply To:
| | 8475
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| 8475 RC Race Buggy – A quick initial review This is a 27 MHz remote control vehicle set. It isn’t called Technic, but it is primarily composed of Technic parts, some new, at least to me. The transmitter has two thumb control joy sticks, one up/down (...) (22 years ago, 11-Jul-02, to lugnet.technic)
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