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Rollout Chart Generator


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#1 shadow_rusty

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Posted 16 January 2018 - 02:04 PM

Hi all,

As you may have seen, I've been updating a few of my spreadsheets to be online...
Here is a new one that I have created to assist with gearing choices.

And yes, if you are an ex RC veteran like myself, this will be very familiar, especially if you ran 1/12 scale.


Online SlotCar Rollout Chart Generator


Note: Rollout is how far the car will travel for 1 rotation of the motor.
Note2: Higher torque motors generally prefer a larger rollout.
Note3: Higher RPM motors usually prefer a smaller rollout.
Note4: Larger tracks in most cases prefer a larger rollout.
Note5: Higher Voltage probably requires a lower rollout.

Edited by shadow_rusty, 16 January 2018 - 02:05 PM.

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#2 slo1quick

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Posted 16 January 2018 - 04:00 PM

Great spreadsheet Shadow, quick reference and comparison!
Just multiply rollout distance by any of the vast different motor RPM options available and you have the (potential) distance per minute.
Could RPM be added to the spreadsheet?
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#3 munter

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Posted 16 January 2018 - 04:56 PM

I am not sure how I am meant to use that information.

Any instructions you care to give?
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#4 shadow_rusty

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Posted 16 January 2018 - 06:36 PM

The best instructions I can give are...

1. You have a car that is geared perfectly for a particular motor. Eg. 9/27@20mm = 20.94
2. You calculate it's rollout.
3. On another car, with the same motor type, but only 18mm tyres, 9/27 = 18.85, which will be too short.
4. So, we can then work out that to get close to 20.94, we would need 9/25 gearing which is 20.92.

In theory, both cars should then perform exactly the same.
In reality, it gets you in the ball park, and you can fine tune from there...
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#5 shadow_rusty

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Posted 16 January 2018 - 06:39 PM

View Postslo1quick, on 16 January 2018 - 04:00 PM, said:

Great spreadsheet Shadow, quick reference and comparison!
Just multiply rollout distance by any of the vast different motor RPM options available and you have the (potential) distance per minute.
Could RPM be added to the spreadsheet?
Thanks slo1quick.

Whilst I could add rpm, I'm not sure what it would achieve. All the results would just be a factor of the rpm larger.
Also, it would just be a theoretical number as no motor will have enough torque at full rpm to actually move the car at that speed...
That said, if people want it, it's not hard to add...

Edited by shadow_rusty, 16 January 2018 - 06:41 PM.

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#6 slo1quick

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Posted 16 January 2018 - 07:37 PM

Thanks Shadow
The rollout chart is great, but....
Most of us relate to Kilometers Per Hour better rather than a broken down fraction of that. So need the RPM factor in order to get that figure.
The theoretical factors are the same for all motors. Not taking into account ( and its not relevant as far as the rollout chart goes) coefficients amps and torque bring into the equation.
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#7 bov

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Posted 16 January 2018 - 08:56 PM

IMHO - a slot.it Orange / Piranha type motor needs a Rollout of about 21.75...
a slot.it Red motor needs a Rollout of about 18.15
A Ninco NC-1 type motor needs a Rollout of about 23.5
So - using your tire diameter, you can now calculate what gear ratio will get you closest to that Rollout number.....
Cheers,

Tony.

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1. What direction do you go
2. What's the Lap Record?

#8 dangermouse

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Posted 16 January 2018 - 11:06 PM

How does one determine - what is a the ideal roll out Bov

How did you come to 23.5 for a NC1
How would I work out the ideal roll out for an NC5 for example?

cheers
David

#9 shadow_rusty

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Posted 17 January 2018 - 12:40 AM

Trial and error David...

And yes, ~24 is about where I start with NC1/BWA motors too.


Slo1quick, I've added another tab for you, this time, in km/h...
Interestingly, the values are not that different to the mm/revoloution version...

Now, I don't believe that it will even come close to the 'km/h' values that are on a Tamiya speed checker, but if it helps you understand the numbers, then it's all good.
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#10 slo1quick

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Posted 17 January 2018 - 06:43 AM

Great stuff Shadow!
Thanks!
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#11 shadow_rusty

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Posted 17 January 2018 - 08:31 AM

No worries...


DM, here are my 'starting' values when setting up a new car...
I haven't updated this list in a while, and it's only a guide.
Also, the values were calculated for 11v - 12v on small - medium tracks.


Motor, RPM, Target Rollout (+/- 0.25mm)

FF-050
BWA 14k FF 14000 24mm
Scaley '18k' (20k) 20000 20mm

FC-130
Ninco NC-1, 13000, 24.5mm
BWA 14k, 14000, 24mm
H&R Jack Rabbit, 14000, 24mm
SRP 16k, 16000, 23mm
Pioneer 18k, 18000, 22mm
Carrera E200, 18000, 22mm
Scaley 18k, 18000, 21mm
Fly 18k, 18000, 21mm
Slotter 18k, 18000, 21mm,
NSR Shark 20, 20000,
ScaleAuto SC-08B, 20000,
SRC x01, 20500, 20mm
Slot.it Orange (Original), 21500, 20mm
Team Slot TS-10 "Fire", 23000, 19mm
Revell ??, 23000, 19mm
Carrera E100, 23000, 19mm
AutoArt 26k, 26000, 18mm
Scaleauto SC-06 Red, 30000,

FK-130
Ninco NC-8 (Thruster), 13000, 25mm
Ninco NC-11 (One), 13000, 25mm
Ninco NC-9 (Sparker), 16500, 23mm
Ninco NC-12 (Evo), 16500, 23mm

FK-180
Ninco NC-2 (Black), 14600,
Ninco NC-2 (Red), 15000, 26mm
Fly Truck 15k (Original), 15000, 26mm
M/T Racing M/T - 5, 15200,
Ninco NC-7, 15600,
Ninco NC-5, 16500, 24.5mm
Ninco NC-12, 19500,
Spirit Lemans, 19500, 22mm
Spirit SxXx, 20500, 20.5mm
Slot.it Flat-6 Yellow, 20500,
Team Slot TS-11 "Glory", 21500,
MSC Lightning, 22000,

FK-SCX
SCX RK-44/91, 17000, 24mm

RX-SCX
SCX F1 / RX-41/42/81/82, 16400, 25mm
SCX RX-81B/82B, 17500,
SCX RX-41B/42B/44B, 18000, 22mm
SCX Pro Turbo Plus, 19000,
SCX RX-91B 4wd, 19100, 21mm
SCX Pro 4wd, 19100, 21mm
SCX Pro Double 4wd, 20000,
SCX Pro Speed, 20000, 20mm
Team Slot TS-4 "Inferno", 20000

Edited by shadow_rusty, 17 January 2018 - 08:37 AM.

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#12 dangermouse

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Posted 17 January 2018 - 10:21 PM

Thanks
Looking at your table it helps explain how an NC1 car that I had mistakenly put an 11t pinion on instead of a 9t set the class lap record and had everyone saying you can't get an NC1 to go that fast :)





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