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Re: (ET) Garden Pulling with the E20
Hi Tim,
yep, the tire was pretty good for this application.
I have the 23x10.5-12 agricultural tires. I bought them
last year, and I remember they were pretty inexpensive
compared to other similar tires I looked at. The brand
was DURO, here is a picture.
http://www.tiresunlimited.com/images/duro/HF255.jpg
I got them somewhere on the web and had them mounted at
a local tire store. Not sure if it was the company from the link
above. Most of the other pullers had special tires, either
the modified agricultural tires (cut to make them bite better)
or the 26x12 size pitbull tires, specially made for garden pulling.
One comment about the tires: they were cheap and seem to work
fine, but they stink - even while my tractors were stored
outside you could smell them from quite a distance. It lasted
about half a year, and by now they have lost the odor.
However, with the tire above (and low air pressure) I had plenty
of traction, but no power left. I could've done a run in LL and
may have pulled it farther but I didn't want to go that slowly.
If I were pulling with the 15hp tractors I think I could have had a good
chance
to win. But compared to the 25hp "tuned" tractors the E20 was a bit weaker.
I've got a spare E15 motor sitting around and thought of putting both
motors
on it, but I don't want to break the gearbox or anything else. So I think
the aim is to lighten the tractor and have my son drive it in the small
350kg/770lbs class.
Markus
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of
> Tim Humphrey
> Sent: Montag, 22. Mai 2006 14:55
> To: elec-trak cosmos phy tufts edu
> Subject: Re: (ET) Garden Pulling with the E20
>
>
> Wow Markus!
>
> What a difference a decent tire makes.
>
> I tried it last year with my I-5. But I have the stock turf
> tires on. Other than that out stories are very similar.
> My first pull was dismal, only went about 4 yards, then lost
> traction. I let *some* air out of the tires and tried
> again. My brother was watching, he commented that he couldn't
> understand what was keeping my tires on the rims. That's
> how much they were digging in with very little air in them.
> Went about twice as far but still lost traction. BUT I
> never hit the red on the meter. I had LOTS of power
> available, just no traction.
>
> I need to get some of those nice deep chevron tires.
>
> I am seriously considering building an Electric
> Super-Modified for next year.
>
> The club I pulled with... Brookfield Garden Tractor
> Pullers.... were are great bunch of people.
>
> --
> Stay Charged!
> Hump
> "Ignorance is treatable, with a good prognosis. However, if
> left untreated, it develops into Arrogance, which is often
> fatal. :-)" -- Lee Hart
>
> Get your own FREE evgrin.com email address;
> send a request to ryan at evsourcecom
>
>
> >
> >From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Markus
> >Sent: Sunday, May 21, 2006 2:55 AM
> >To: elec-trak cosmos phy tufts edu
> >Subject: (ET) Garden Pulling with the E20
> >
> >
> > Hi all,
> >
> > I put the following report on the forum, thinking you may
> want to hear it as
> > well:
> >
> > Hi fellow elec-treckies,
> >
> > I read a mail in the archives once about another elec-trak owner who
> > had much success with competing in a garden tractor pulling
> competition.
> >
> > I had to try that with my E20 and this weekend one of the German
> > gardenpulling championship runs was realtively close by,
> so... I got my
> > E20 ready and showed up there. I could not register as a
> competitor as the
> > rules only allow gas and diesel tractors, BUT they let me
> start with the
> > other stock tractors (only rel. small modifications) in my
> weight category.
> >
> > The tractor with me on it weighed almost 1200 pounds !,
> which was just a
> > bit more than what the large stock garden tractor category
> allows (1100lbs),
> >
> > there is also a smaller garden tractor category, which is
> limited at 770lbs.
> >
> > Anyhow, I was to compete with tractors like a JohnDeere 400
> and similar,
> > wich run in the 25HP category. The inital weight added to
> the brake sled
> > was 500 lbs (the weight moves from the wheels to the sled part while
> > you travel). A full pull would be 50 meters (bout 50 yards).
> >
> > First run:
> > I pulled of in L, speed 4 (full armature, full field) and
> held it there.
> > The power meter was in yellow. The tractor was going nicely, I had
> > lowered the pressure in my tires so they would flex and provide good
> > traction. Everybody was surprised it pulled the sled so easily. The
> > moderator also was great, a great comment she made was that she
> > really enjoyes being able to talk while a tractor was running
> > <http://www.elec-trak.com/forum/images/smilies/smile.gif>
> >
> > Well about 10 yards down the path the power meter was in the red
> > and .... at 25 yards the needle was pegged right and the tractor
> > slowed down a bit, (the weight had travelled about halfways to the
> > front where the sled part is) I first thought that was
> gonna be it ...
> > but it kept pulling .... and pulling ... slow and steady
> ... I rememberd
> > that the
> > more a series wound DC motor is slowed down, the more torque
> > it produces (and amps it pulls, I started to smell the
> current shunt) ...
> > I started to have hopes again that I would make a full
> pull, but then ,
> > about 9 yards from the full pull line, the klixon breaker
> on the motor cut
> > out.
> >
> > Three of the four other tractors with around 25hp made a
> full pull, one
> > got about as far as I did. Even though I had my hook up point pretty
> > far back from the axle the fron wheels only came up about 5
> inches of the
> > ground.
> >
> > I touched the motor, it was still cold on the outside, the
> heat built
> > up was either not bad or it had not made it to the outside
> of the case.
> > After 2 minutes the power came back and I drove the tractor back.
> >
> > I then decided that because it was only another 9 yards,
> that I would
> > try without the klixon (everybody has 2 tries). The second
> run seemed
> > to draw more current earlier in the game, it went ok, and I
> passed the
> > 41 meter mark, but I was going very slow by then. I was worried that
> > I might damage my commutator if I stalled the motor and at 42 meters
> > I decided was getting too risky and stopped.
> >
> > So, in summary - I surprised a good share of people today with what
> > the elec-trak can do. Nobody had ever heard of anything
> like an electric
> > garden tractor. If I find the time I will attend another
> pulling one time,
> > then
> > with my gel batteries to provide a bit higher current and maybe with
> > direct wiring (without the shunt) or with my alltrax, or
> both. Maybe I'll
> > let my son drive the E20 in the 770 pound category by putting light
> > batteries in it when he is old enough (770 pound category
> goes from 8 - 16
> > years).
> > I think it will comete quite well with the smaller tractors
> with their 15ish
> > HP motors.
> >
> > I posted my pictures at http://markus.lorch.net/et/gardenpulling/
> > <http://markus.lorch.net/et/gardenpulling/>
> >
> > Markus
> >
> > P.S. you can see pictures of the other tractors at
> www.gardenpulling.de
> > <http://www.gardenpulling.de/>
> >
> >
>
>
>
>
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