New Tekin software dropped today

[Melbatoast]

For all I know all you guys have been running it for a while, but as a new RS owner it has me pretty interested.  Why I didn't get one of these in the first place, who knows.  It's a sweet little unit.

Hotwire 4.00 and RS software 2.03 http://www.teamtekin.com/hotwire/vegas/index.html

Couple of Lambert 17.5 setups have been posted to RC Tech, too.  Gearing seems huuuge, although I suppose he would be running 44mm tires or something.  Still, 92-95mm rollout.  85mm sound about right for our track?

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[jarrodH]

just remember that the tracks that they run on are alot bigger, more like a 10th scale track, so the gearin will be alot different..

[Gorden]

I'll be starting out around 70mm for roll out

[Melbatoast]

What are the dimensions of our track?  60 x 35-ish?

[Gorden]

I would think its about 70ft X 36ft.

Gorden

[Melbatoast]

The second setup there is for 70 x 45.  He was running 42.6mm tires, so 89mm rollout.  I think I'll try 80mm.

[jarrodH]

i uaually run about 83-86mm rollout..

[gotnitro]

i justed check my roll out with new tires it was at 84

[Gorden]

i justed check my roll out with new tires it was at 84

what would it be if you drop 5 teeth from the pinion?

Gorden

[WhoDoYouThink]

For you folks that need to figure out your roll out, go here:

http://www.gearchart.com/index.cfm?fuseaction=chart.create

It couldn't be easier! :-)

[Tom]

what would it be if you drop 5 teeth from the pinion?

You should figure this sort of thing out yourself.

The formula for roll-out is something you should understand.

D = tire diameter
R = rollout
P = pinion size
S = spur size
PI = ratio of the circumference of a circle to its diameter

Notice there are no units in the above variables.  We deal in mm of roll out, so measure tire diameter in mm.  If you want inches of roll-out, just measure your tires in inches instead.

To figure out roll out (or what is the roll out I have my car set up with), use the following formula (substitute 3.14 for PI if you like):
R = PI * D * P / S

As you can see, changing the pinion by 5 teeth will change your roll out different amounts depending on what spur you have and tire diameter.

Solve for P (or what pinion do I need to achieve a particular roll out, given the tires and spur gear on my car):

P = (R * S) / (PI * D)

It's simple algebra to solve for the other variables, but I'm not sure which others are useful.

Half the racers bring their laptop computers to the track to program their speed controllers.  Use your brain and plug this into a spreadsheet, or write a program for your calculator, or write this down so it's easy to plug the numbers into your calculator, cell phone, or whatever other kind of calculator you're using.  Gear charts can be handy, but it's quite helpful to know how to come up with one yourself in case you loose it.

[Gorden]

I wanted to know Gerry's roll out not how to figure it out

but thanks anyway Tom

[Falcon]

Also you could add the app to your phone if you have an apple iphone.

[gotnitro]

that was roll out on the pan car.oops   74 roll out on the 12scale car 74 spur and 37 pinoin Gord

[dajracer]

Are you running Tekin, Gerry?? They are a little different than other ESC's.