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Model Forum / Radio Controlled / Land Models / November 2003



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help - first nitro good and ???

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Gary & Emily - 14 Nov 2003 00:22 GMT
after doing electric off and on for several years, i recently purchased a
traxxas nitro rustler.  i watched their break in procedure on the included
dvd several times;  today i went out to a nice flat parking lot and did the
engine break in routine.  the good thing is that using the "easy start" was
in fact easy.  the motor started right up every time.  so far i really like
this method of starting.

now here is the questionable part.   this thing was on the verge of being
uncontrollable. seems like every time i would break the truck would have a
tendency to veer off to the left then violently spin around.   if i barely
touch the steering to correct, it still violently spins.   by then end of
the 5 tanks of fuel, i have just about destroyed the rear tires.   i know
these are not street tires but i was trying very hard NOT to spin out.  the
least little sterring input results in a violent spin out and a few flip
overs.   like i say i am pretty used to driving using my electrics (with
modified motors) so i don't know if this is a setup problem or a combination
of gobs more torque on the nitro plus the absence of dual rates on the radio
(this was the rtr with the cheapo traxxas radion).

other factors:  the temperature today is around 55 degrees or so, not cold
but cool.  after the breakin, i did run it a little in the grass / dirt area
and it did seem to hold traction a little better.   i guess i am just not
used to sooo much power / torque.

i would appreciate any inputs / suggestions anyone may have as to what i can
do to keep this thing under control.   other than the handling (which is
about 80% of driving), the motor was great.   by the end of the breakin
period was running smooth and no flame outs.

gw
MT Man - 14 Nov 2003 03:07 GMT
I have the electric version of the rustler with a 21 turn motor installed.
With the stock tires and an "off-road setup" I flipped mine almost every
time I cornered on pavement.

The reasons:
-Most off road tires have too much side wall flex for street running
-Off road setup has too high a CG especially with the electric rustler
(chassis)
-Suspension is set soft for off-roading
-Camber + caster angles are more critical on pavement than when off-roading

If you look at the above points some fixes become self explanatory. In
addition I would say that you're correct about having gobs more power with
the nitro truck. The stock servo that comes with the truck is probably
pretty weak; and after 5 tanks your TX batteries are probably not as strong.
So whether you give it a little steering or allot when the tires dig in the
servo probably cannot over come the weight and power of the truck, which
results in massive over-steer and inevitably a tip over. I would suspect the
same is happening when you're braking. As far as it veering left it could be
a few things, chassis in not tweaked properly, shock dampening is not the
same on both sides, stripped servo gears biasing the left side, improper
and/or different wheel angles, rotation of the earth, etc...

Hope this helps. If not re-post or go back to electric. :o)

MT Man

> after doing electric off and on for several years, i recently purchased a
> traxxas nitro rustler.  i watched their break in procedure on the included
[quoted text clipped - 26 lines]
>
> gw
Gary & Emily - 14 Nov 2003 03:19 GMT
good stuff to get me started.  thanks.
gw

> I have the electric version of the rustler with a 21 turn motor installed.
> With the stock tires and an "off-road setup" I flipped mine almost every
[quoted text clipped - 61 lines]
> >
> > gw
frater mus - 21 Nov 2003 16:01 GMT
> addition I would say that you're correct about having gobs more power with
> the nitro truck. The stock servo that comes with the truck is probably
> pretty weak; and after 5 tanks your TX batteries are probably not as strong.

The steering servo on the N. Rustler is is the 2055 hi-torque
(80in/oz).  My steering probs with the NR have more to do with the
front tires being off the ground so often...  :-)

Signature

L.V.X., brother mouse
http://www.mousetrap.net/otr/           Old Time Radio trades
http://makeashorterlink.com/?K16312E06  CBS Radio Mystery Theater database
http://greyhound.mousetrap.net/altus/   retired racing dog

 
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