| XRAY - Model racing cars https://setup.teamxray.com/xsetup/legacy/ |
|
| Xray T1FK'05 https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=8&t=1584 |
Page 1 of 1 |
| Author: | hutchy37 [ Tue May 10, 2005 11:16:14 ] |
| Post subject: | Xray T1FK'05 |
| Author: | Joep [ Tue May 10, 2005 11:36:49 ] |
| Post subject: | |
The webside contains a lot of info. Some digging brings almost all answers 
For the diif you find some info. But for gearing I've built a excel spreadsheet to determine roll-out. And the right pinion / spur combination is so specific that there is no general model for it. Greetings, Joep |
|
| Author: | littleal [ Tue May 10, 2005 13:25:38 ] |
| Post subject: | |
This is probably a stupid question, but then they all are if you dont know the answer - is there a specific rollout figure for each make of tyre - or is it calculated some other way. I've heard rollout mentioned a lot but never really fully understood what it does or how you calculate for diferent tracks to get your gear ratio. Many Thanks Phil. |
|
| Author: | Joep [ Tue May 10, 2005 15:05:50 ] |
| Post subject: | |
I never heard of stupid questions. Learning is done by asking and making mistakes. I'm still doing that. 
The definition of roll-out is: The amount of mm the car travels per revolution of the motor. The formula to calculate roll-out is: (tire diam. in mm) * pi * (# tooth pinion) / (# tooth spur) * (# tooth pulley duff) / (# tooth pulley central layshaft) And (# tooth diff) / (# tooth central layshaft) = also called 'internal gear ratio' For the FK'04 it is 1.77 And for the FK'05 it is 1.7 Ok example: Tire 64 mm pi = 3.1416 pinion = 25 spur = 84 car = fk'05 roll-out = 64*3.1416*25/84*1.7 = 35.2 mm / motor rev Now practical: - motor too hot-> lower roll-out - Good batteries to quickly empty -> lower roll-out - motor does not reach max rev's before half of the straight -> lower roll out And of course everything the other way around also applies. I always calculate with 64 for rubber tires. But in theory every brand has a deviation.... I hope this helped a little. Gr. Joep |
|
| Author: | calvin [ Tue May 10, 2005 15:08:58 ] |
| Post subject: | |
| Author: | apexracing [ Tue May 10, 2005 17:36:37 ] |
| Post subject: | |
lol hey us honda/ rc fanatics use mm a lot lol! |
|
| Author: | Joep [ Tue May 10, 2005 17:38:50 ] |
| Post subject: | |
| Author: | mario [ Tue May 10, 2005 18:33:55 ] |
| Post subject: | |
| Page 1 of 1 | All times are UTC + 2 hours |
| Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |
|