R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 11-22-2007, 09:47 AM   #1
Tech Fanatic
 
gansei's Avatar
 
Join Date: Sep 2006
Location: Bander, Seoul
Posts: 889
Default had lipo less power than NI-MH?

i had li-po battery(4800ma, 20C).

and i used 3.5 or 4.5 Brushless motor in 1/10 TC car.

and i feel li-po batter had less torque and high-speed than Ni-MH (4500ma, 6 cells).

is it normal state? or my li-po battery had problem?
__________________
MY SPONSORS:

★ Show Hobby(Novarossi)
Km Racing HK1 Meen Version
Another Nick: Bander
gansei is offline   Reply With Quote
Old 11-22-2007, 10:03 AM   #2
Tech Elite
 
bvoltz's Avatar
 
Join Date: Jun 2005
Location: Bedtime with Teddi
Posts: 3,635
Trader Rating: 44 (100%+)
Default

Quote:
Originally Posted by gansei View Post
i had li-po battery(4800ma, 20C).

and i used 3.5 or 4.5 Brushless motor in 1/10 TC car.

and i feel li-po batter had less torque and high-speed than Ni-MH (4500ma, 6 cells).

is it normal state? or my li-po battery had problem?
I think it was your pack... But one of the keys is the C rating... the higher the number the more the batteries will give up and feed the motor... The new Orion 3600 is 25C which is better then 20C and also the better the cells, the better performance you will get from the pack...

hope this helps...
__________________
Wheeling an Xray T4 and T4 14 using a Ko Propo, powered by EA motors and Speed Passion Speedo, paid for by my wife.

Digi3Dworks - 3D printing for the medical Field.
bvoltz is offline   Reply With Quote
Old 11-22-2007, 10:03 AM   #3
Tech Elite
 
Yeti35's Avatar
 
Join Date: Sep 2004
Location: SL, UT
Posts: 2,804
Trader Rating: 5 (100%+)
Default

Quote:
Originally Posted by gansei View Post
i had li-po battery(4800ma, 20C).

and i used 3.5 or 4.5 Brushless motor in 1/10 TC car.

and i feel li-po batter had less torque and high-speed than Ni-MH (4500ma, 6 cells).

is it normal state? or my li-po battery had problem?
From my understanding, I don't run lipo, the lipo pack just stays consistant the whole way through a run. Where as you noticed the Nimh has more punch but tends to go flatter toward the end of the run or just drops off. I have heard of some who did Lipo for awhile but went back to Nimh just for that reason. If you are about the low maintenance then Lipo is for you but you do sacrafice a little on the performance end.
__________________
JRXS Type R, I have four of them!! ;) ( Yes, I still have them!!)And racing one of them again!!
22 3.0SR
22T 2.0 w/ Exotech chassis
Yeti35 is offline   Reply With Quote
Old 11-22-2007, 10:06 AM   #4
Tech Champion
 
Join Date: Oct 2005
Location: Cincinnati, OH
Posts: 5,360
Trader Rating: 38 (100%+)
Default

With a 3.5 motor the lipo should have been faster. If it had been a 13.5 the nimh should be faster
or8ital is offline   Reply With Quote
Old 11-22-2007, 10:10 AM   #5
Tech Elite
 
Turbo Joe's Avatar
 
Join Date: Nov 2003
Location: Corona, CA
Posts: 4,878
Trader Rating: 41 (100%+)
Default

Yeah, for some reason people think "Lipo = more voltage". A good NiMh pack has more voltage.

Just gear it up. The "20C" is what it CAN flow, not what it does flow. Gear it up and use more of the 20C.
Turbo Joe is offline   Reply With Quote
Old 11-22-2007, 11:12 AM   #6
Tech Lord
 
syndr0me's Avatar
 
Join Date: Dec 2004
Location: 5280 Raceway
Posts: 13,140
Trader Rating: 32 (100%+)
Default

LiPo should have more voltage under load, though. You'd think with the loads of a mod motor, LiPo would be the clear winner. Something might be wrong.
syndr0me is offline   Reply With Quote
Old 11-22-2007, 11:24 AM   #7
Tech Addict
 
GreaseMonkey's Avatar
 
Join Date: Apr 2006
Location: Ottawa, Canada
Posts: 552
Trader Rating: 4 (100%+)
Default

Really? I've run Lipo and 4200 one after the other and Nimh are noticeably faster to start with. As the voltage drops off the difference isn't as pronounced. I use lipo for the convenience, not for the power.
__________________
I'm not a grown man playing with toys. I'm a hobbyist.
GreaseMonkey is offline   Reply With Quote
Old 11-22-2007, 12:25 PM   #8
Tech Elite
 
Turbo Joe's Avatar
 
Join Date: Nov 2003
Location: Corona, CA
Posts: 4,878
Trader Rating: 41 (100%+)
Default

Quote:
Originally Posted by syndr0me View Post
LiPo should have more voltage under load, though. You'd think with the loads of a mod motor, LiPo would be the clear winner. Something might be wrong.
If you really think about it, the conditions where the Lipo would really have a sizeable advantage in voltage are going to be fairly fleeting. Most of the time, even a mod motor won't be flowing a very large number of amps. Once you round a corner and the motor starts gaining speed, the load will fall pretty quickly.

Like I said...just gear it up.
Turbo Joe is offline   Reply With Quote
Old 11-22-2007, 12:29 PM   #9
Tech Lord
 
syndr0me's Avatar
 
Join Date: Dec 2004
Location: 5280 Raceway
Posts: 13,140
Trader Rating: 32 (100%+)
Default

Quote:
Originally Posted by Turbo Joe View Post
If you really think about it, the conditions where the Lipo would really have a sizeable advantage in voltage are going to be fairly fleeting. Most of the time, even a mod motor won't be flowing a very large number of amps. Once you round a corner and the motor starts gaining speed, the load will fall pretty quickly.

Like I said...just gear it up.
Yea, you're probably right. I imagine driving style/skill will come into play as well.
syndr0me is offline   Reply With Quote
Old 11-22-2007, 12:32 PM   #10
Tech Elite
 
joe of loath's Avatar
 
Join Date: Mar 2007
Location: Bristol, England, United Kingdom
Posts: 4,857
Trader Rating: 1 (100%+)
Default

lipo can deliver more current with more runtime. so +3 on what they said ^^^
__________________
HPI E-Firestorm - Tamiya TA05 racer (carbon chassis, 10.5 brushless etc) - LRP Blast S10 BX - Revo 2.5r truggy conversion (in progress)
joe of loath is offline   Reply With Quote
Old 11-22-2007, 12:35 PM   #11
Tech Elite
 
BlackedOutREVO's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2007
Location: CA
Posts: 3,791
Trader Rating: 67 (100%+)
Default

I have noticed that my lipos have lots more punch then nimh, but not the same speed....

But like said, I use lipo for convenience, not for power....
__________________
R1 Wurks/Awesomatix USA/Roche USA/Protoform/Solaris/Mo Speed/Speedworld Raceway
BlackedOutREVO is offline   Reply With Quote
Old 11-22-2007, 07:36 PM   #12
Tech Fanatic
 
gansei's Avatar
 
Join Date: Sep 2006
Location: Bander, Seoul
Posts: 889
Default

i run compared ni-mh(4500) with lipo(4800) as same gear ratio.

lipo had more 170g lightweight than ni-mh.

But ni-mh had more punch and more top-speed.


when i use li-po.. must gear up?
__________________
MY SPONSORS:

★ Show Hobby(Novarossi)
Km Racing HK1 Meen Version
Another Nick: Bander
gansei is offline   Reply With Quote
Old 11-22-2007, 08:08 PM   #13
Tech Elite
 
Jack Smash's Avatar
 
Join Date: Aug 2001
Location: Reno, NV
Posts: 2,897
Trader Rating: 29 (100%+)
Default

Yeah, there is a huge mis-conception that Lipo is faster than NiMH. I ran a Lipo in my T4 this season in offroad. People were complaining that I had an unfair horsepower advantage. I put in an IB4200 and walked away from everyone even more.
__________________
Kyosho / Orion / Amain.com / Protek / MIP /
Jack Smash is offline   Reply With Quote
Old 11-22-2007, 08:09 PM   #14
Tech Addict
 
magm20001's Avatar
 
Join Date: Sep 2007
Posts: 546
Trader Rating: 5 (100%+)
Default

in terms of torque and top speed, 1.25v+ nimh will walk all over lipo's
__________________
RIP Kanye West ..... Mom
magm20001 is offline   Reply With Quote
Old 11-22-2007, 08:26 PM   #15
Tech Elite
 
Turbo Joe's Avatar
 
Join Date: Nov 2003
Location: Corona, CA
Posts: 4,878
Trader Rating: 41 (100%+)
Default

Quote:
Originally Posted by gansei View Post
when i use li-po.. must gear up?
For sure...gear up. Just like they do for 5-cells. Not as much, because the difference isn't as large, but for sure at least a tooth or two.
Turbo Joe is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Car kits for 22.2V 6s Lipo power razorbak Rookie Zone 6 11-02-2008 07:53 PM
ICE LIPO AND POWER SUPPLY!! F/S i730 R/C Items: For Sale/Trade 10 03-02-2008 03:18 PM
Thunder power 1320 Mah Lipo and Thunder Power Ballancer (For 1/18 scale) Travis S R/C Items: For Sale/Trade 2 02-08-2008 08:50 PM
Maxamps lipo and DN Power lipo packs harjo R/C Items: For Sale/Trade 2 12-02-2007 11:20 AM
Lipo charger with power supply and 2 cell lipo pack fweemindan R/C Items: For Sale/Trade 3 01-03-2007 11:51 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 09:49 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