R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 09-24-2010, 03:43 PM   #1
Tech Regular
 
M3Armand's Avatar
 
Join Date: Aug 2010
Location: Boston, MA
Posts: 263
Exclamation Servo rating, which is faster?

I'm comparing some servos and the units are different.

Can someone tell me which is "faster"?

A) Speed: 0.06sec/cm
b) Speed: 0.1 sec/60 degrees at 7.2Volts

I don't understand why "A" is .06 sec per centimeter. I.e. - from what standpoint do they measure the centimeter?

Or better yet, can people tell me which is the "best" servo (in your opinion) is for touring cars?
M3Armand is offline   Reply With Quote
Old 09-24-2010, 04:01 PM   #2
Tech Master
 
locked's Avatar
 
Join Date: Mar 2010
Location: Toronto
Posts: 1,758
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by M3Armand View Post
I'm comparing some servos and the units are different.

Can someone tell me which is "faster"?

A) Speed: 0.06sec/cm
b) Speed: 0.1 sec/60 degrees at 7.2Volts

I don't understand why "A" is .06 sec per centimeter. I.e. - from what standpoint do they measure the centimeter?

Or better yet, can people tell me which is the "best" servo (in your opinion) is for touring cars?
I haven't seen them rated by time/cm before. Weird.

If you were looking at a particular servo that only listed it that way in the specs, see if you can find the same servo on http://www.servodatabase.com/

It might help you to answer this question.
locked is offline   Reply With Quote
Old 09-24-2010, 04:08 PM   #3
Tech Regular
 
M3Armand's Avatar
 
Join Date: Aug 2010
Location: Boston, MA
Posts: 263
Default

Quote:
Originally Posted by M3Armand View Post
I'm comparing some servos and the units are different.

Can someone tell me which is "faster"?

A) Speed: 0.06sec/cm
b) Speed: 0.1 sec/60 degrees at 7.2Volts

I don't understand why "A" is .06 sec per centimeter. I.e. - from what standpoint do they measure the centimeter?

Or better yet, can people tell me which is the "best" servo (in your opinion) is for touring cars?
A = Hot Bodies #67991 HB DSJ-1SS Digital Servo (High Speed Type)
Speed: 0.06sec/cm
Torque: 13kg/cm
Steel and Aluminum hybrid gear construction
40.5mm*40mm*21mm

B = My old KO PS-703 FET
41 x 35 x 21 mm
1.73 oz = 49 grams
5.3kg/cm = 73.6 oz-in torque (7.2V)
0.1 sec/60 degrees (7.2V)
M3Armand is offline   Reply With Quote
Old 09-24-2010, 04:08 PM   #4
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

I suspect that might be a typo. You sometimes see torque rated as newtons/cm or kg/cm but not speed.

Did some digging and apparently it isn't a typo. I have no idea how they get that measurement as the motion ratio of the arm would affect the distance traveled. So I have no idea how it would convert either.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Old 09-24-2010, 04:50 PM   #5
Super Moderator
R/C Tech Elite Subscriber
 
Join Date: Oct 2007
Location: Rochester Hills Michigan
Posts: 7,232
Default

It’s a typo I suspect, and not the only one. /cm doesn’t even make sense for torque. Should be kg-cm (force times distance). Even the KO example only has it right for the English units (oz-in).

Last edited by Dave H; 09-24-2010 at 05:24 PM.
Dave H is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
UNDERSTANDING SERVO'S DIGITAL VS ANALOGUE COBRARACING Nitro Off-Road 20 01-01-2010 11:20 AM
UNDERSTANDING SERVO'S DIGITAL VS ANALOGUE COBRARACING Australian Racing 17 11-23-2009 03:31 AM
---What Servo's for Full racing! Help Needed!---- jamiekerr14 Nitro Off-Road 54 01-29-2009 07:20 AM
fastest digi servo for reasonable price? builthatch Electric On-Road 23 10-26-2006 10:34 PM
7.2V servo/ESC hookup ZER01 Electric On-Road 24 06-07-2004 10:21 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:02 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net