We talked about self-propelled lawnmower differentials like the ones they
sell at Surplus Center. It turns out that they cannot go in reverse with
some mechanical modifications.
-Doug
From: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com]
On Behalf Of mac wynkoop
Sent: Tuesday, October 20, 2009 6:25 PM
To: rctankcombat@googlegroups.com
Subject: [TANKS] Re: Differentials
Well, not too long ago I saw a differential on my neighbor's self-propelled
lawn mower. It looked like it would fit a tank perfectly. Maybe I should ask
him if he wouldn't mind pushing it again...
On Tue, Oct 20, 2009 at 12:26 PM, Steve Tyng wrote:
I have given the subject of differentials in a 1:6 scale r/c combat
vehicles some thought over the years. At one point I was interested
in building an armored car (AC) and may still do so. I looked at the
various differentials currently available and have yet to find one
that I feel is appropriate for our vehicles. On the heavy end are the
differentials built for go-karts. These are to large for a typical
1:6 scale AC and have monster 3/4" or 1" output shafts. On the other
end of the spectrum are the hobby differentials produced for "monster"
scale r/c trucks. I've looked at these and weren't impressed with
there robustness and many plastic parts. I have seen references to
differentials for 1/4 scale r/c sand buggy's that sounded good but
they were on a German site with little info and the pricing looked to
be exorbitant. IMO the best option will be a dual motor setup (or
quad motors for 4wd) driven from one speed controller. This
"electronic" differential provides the same functionality as a
mechanical one in that it provides varying power to the left or right
drive wheels depending on load. It can be built as robust as required
much as we build our drive-trains currently. The issue will be
finding the appropriate motors for such a scheme. The motors will
need to be relatively powerful and small to fit into the smaller
chassis. For this all we need to do is look to the new electric
skateboard sport where small high-powered motors of up to 600 watts
can be found. While on Allellectonics.com the other day I noted a
nice 135 watt motor that that I have seen used on electric skateboards
and may prove to be ideal for the smaller wheeled r/c combat vehicle.
http://www.allelectronics.com/make-a-store/item/DCM-130/24VDC-135W-MOTOR-W/-
BELT-GEAR/1.html
If I were to start building an AC tomorrow I'd get two of these motors
and a single reversing scooter controller and design an AC around
that.
Steve Tyng
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