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[DPRG] Camera Car (was Electronic Speed Control)

Subject: [DPRG] Camera Car (was Electronic Speed Control)
From: David P. Anderson dpa at io.isem.smu.edu
Date: Wed Aug 9 14:38:59 CDT 2000


Seems like we might have enough CameraCars for a competition.

We use an off-the-shelf Traxxas R/C speed control, manufactured
here in Dallas (well, probably really in Taiwan) on our camera car.
This is the speed control that came with the car, which is a Traxxas
"Big Foot" monster truck with the body removed.

We modified the drive train for lower speed/higher torque gearing,
as mentioned by Patrick in his posting.  The camera and transmitter
are driven by a 10 cell pack of AA nicads.  This is mounted underneath
the car to the bottom side of the chassis (lots of ground clearance on
a monster truck) and helps lower the center of gravity a little and 
counterbalance the camera/transmitter/antenna.

We also "slammed" the truck by removing the stock wheels and replacing
them with smaller (2 inch?) ones, reducing the high speed somewhat and
getting a bit more torque, to handle the now heavier car.  It will still 
go faster than any of us want to drive it, and accelerates much better
with the smaller wheels.

Most of the time we just drive around the house and yard, or the building 
here at work, and look for people to interact with.  I have a funny
video tape of pushing trash cans around the lobby, and pushing one down
the stairwell and then running away like a bad little kid.

I have also raced against Mr. Michael Hamilton, who has won national
championships racing normal electric radio controlled cars.  We have
a course laid out in his house as follows.  Start in the living room 
in front of the TV, then around through the bedroom to the kitchen,
straight through the kitchen and out the door into the garage, between
the motorcycle and the pickup (watch that kick stand!) around the
pickup (Michael later added a trash can for a "chacane") back through
the kitchen door and hard right from the kitchen back to the living

It's actually very exciting.  The camera image shakes around on the TV,
and because the camera position is so close to the ground it really
appears to be going extremely fast.  A lot of driving skill is required
to maneuver through the tight spaces and still keep the speed up.  We've
knocked the camera off several times and broken 3 different antenna

Five laps is one heat.  One of us drives, the other times it with a
stopwatch.  First we had to drive it enough that we stopped running off
the course and hitting things.  Then we really started to race.  We
stayed up 'til 3:00 in the morning one weekend, and Mike was turning
in 15 second laps, amazing!   But I held my own, always within a few
seconds of his times.  I'm not sure his experience really helped that
much in this circumstance.  That's encouraging!

Mike believes that with a different motor and better batteries,
we might be able to turn in 12 second laps, and break the now infamous
"One Minute Barrier.

Mr. Hamilton is the current World Champion Denton Texas Invitational
Indoor CameraCar Grand Prix.   And I'm Number Two.

You might have a similar course layout in your home.  You could also
be a World Champion!


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