RCPowerCalc is 3 useful iPhone/iTouch applications in one.

Rollout Calculator:
Of course, you can calculate your rollout given the tire size, pinion and spur. You can just as easily perform the reverse calculations. Given a rollout and tire size, what spur or pinion would you need.

Rollout Finder:
The rollout finder provides a calculator which can estimate a few values. First, given a lap time, track length and loaded (or average) RPM, you can find the necessary rollout to achieve that lap time. You can also perform the reverse calculations and estimate your average RPM or your estimated fastest lap time given a specified rollout.
** NOTICE: The rollout your car can handle depends on a number of factors including chassis efficiency. This tool will provide an estimate based on mathematical calculations. Anytime you change your rollout, you should run for 1 minute and take the motor temperature ensuring that the temperature is within the manufacturers specifications **

Average Amp Draw:
With this tool you can calculate the average amperage draw your motor pulls during a run. This can give an indication of chassis efficiency and motor efficiency. This can also allow you to configure your dyno appropriately.

You can get the application at the iTunes store. Just search for RCPowerCalc.

Please submit any questions, comments or suggestions here as I am eager to hear them.

Thanks,
Chuck

So, apparently I uploaded the app with a small bug which truncates the decimal portion of the transmission ratio before calculating the final rollout. Basically, if you have a transmission ratio of 2.4 it will calculate the rollout using 2.0. So, if you have a transmission with a whole number trans ratio (1,2,3,...) then you won't know the difference (i.e. pan cars with a 1.0 trans ratio). The fix was quick, and a new version 1.0.1 has been uploaded. The only problem is that the iTunes store takes a long time to "approve" the application. I'm figuring that the new version will be released next week sometime. Just a side note, but all updates are free.

Thanks to Walter from ORC for noticing.

Chuck

I purchased the app. Looks good and should be handy.
Chris

I purchased the app. Looks good and should be handy.
Chris
Awesome. Let me know how you like it.

Chuck

I installed it ... looks nice. I think it is a good place to look at for a starting gear ratio.

I installed it ... looks nice. I think it is a good place to look at for a starting gear ratio.
Thanks. I have used the rollout finder with some success at the tracks I have been at. In some cases, it would put me surprisingly in the ball park. I would like to hear other successes/failures at specific tracks, conditions, etc. just to get a feel.

Thanks,
Chuckl

Sorry all, but the update is _still_ in review with the iTunes store. I'm hoping it breaks out this week.

Chuck

Ok, looks like the update finally went through the itunes review process.

Please update your software when you have a chance. I have fixed the bug where the gearbox ratio value was being clobbered and was only returning the integer portion of the ratio (e.g. a ratio of 2.4 was being truncated to 2.0).

Chuck

got the app have a question?

why is this app no longer available?

ya i just tryed to put it on ipod and had that issue myself. came up and tryed downloading and then came up no longer avaliable. :-( what other apps are there i heard there are a few

gearit app. got it lol

All,
I had a problem trying to re-register with Apple.as a developer. Trying to figure it out right now.

Thanks for the continued interest.

Chuck

pm box is full but what u pm me sounds like that is what is going on. will try your way around it and see if it works

any chance for a droid version?

Thinking about it. :)

App was finally re-instated on the iTunes store. Sorry for the delay if anyone was trying to purchase the app.

I also uploaded an update (version 1.0.2) which is going through Apple's review process right now. Apparently when you tried to calculate the pinion gear given all the other information and a non-1 value for the gearbox, it calculated the pinion incorrectly. That is fixed in 1.0.2. Thanks tq for illuminating that issue.

Thanks,
Chuck

Ok, looks like the App made it through Apple lickety-split! Version 1.0.2 is ready.

Thanks,
Chuck

Thinking about it. :)

Still thinking about it? Would be nice to have for the Droid.:thumbsup:

tried to find the app, i searched the RCPowerCalc and nothing turned up. any ideas?

tried to find the app, i searched the RCPowerCalc and nothing turned up. any ideas?
On itunes I search for RCPowerCalc and get the app. Here is a link though.

http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=328558488&mt=8&ign-mpt=uo%3D6

Chuck

got the new update works like a champ thanks for a good app.

got the new update works like a champ thanks for a good app.
Awesome! Glad to hear. Thanks for illuminating the problem in the first place.

Chuck

Driod?????????

Patience. Lol

Chuck

bump for great App...

Thanks Dom.

Still looking into droid.

Chuck

One more time......DROID....LOL

One more time......DROID....LOL

And a second.... :thumbsup:

Mutiny! Where are all the Apple people?! lol

hi chuck!
just two questions ref rcpowercalc: which measurement units for the tire diameter?
i have a bike; the secondary transmission (chain) is fix (16 to 44) what the "transmission ratio" then? 0,36 or 2,75 ?
thx, chris

hi chuck!
just two questions ref rcpowercalc: which measurement units for the tire diameter?
i have a bike; the secondary transmission (chain) is fix (16 to 44) what the "transmission ratio" then? 0,36 or 2,75 ?
thx, chris
Ok, the first answer is that if you are calculating the rollout using pinon, spur, tire diameter, etc you can use whatever units of tire diameter you want. You will just get a rollout in mm/rev instead of in/rev. When you are trying to calculate RPM or find an RPM in the other screen, that is all done in inches. I may have to update that being that I have a number of European customers.

As for the second question, I am assuming that you have a motor with a pinion. The pinion touches the spur which is mounted on the same axle as the smaller (16 tooth) sprocket. That small sprocket is then connected to the larger sprocket (44 tooth) via a chain. If this is the case, then you need to use the 16/44 or 0.36 as the gearbox ratio.

Chuck

Droid !!!!!!!!!!

These are not the droids you are looking for... :)

Chuck

I know......................start smackin' the keyboard.