R/C Tech Forums

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

Like Tree4Likes
Reply
 
Thread Tools Search this Thread
Old 02-28-2011, 04:02 PM   #2326
Tech Adept
 
Join Date: Dec 2008
Location: Switzerland
Posts: 184
Default

Quote:
Originally Posted by macnkitty2002 View Post
Got to test my TT for the first time today. I am having some radio issues and I dont know whats going on.

The steering servo randomly recenters itself to a different position about every 10 seconds. I have it set perfectly straight on the bench, but I do a pass and come back and now the neutral setting is pointing to the right. I do another pass and it'll reset the neutral steering position to something else. It makes it impossible to drive on a track. I am using a Spektrum DX2.0 transmitter and an sr3000 receiver. I have a capacitor in the "aux" slot (this is supposed to help maintain voltage to the receiver) but that doesn't help. I'm using the Castle Sidewinder SCT 3800kv motor system.

Also, my motor temps are around 100F and my ESC is around 120F. Is this normal? I was using a 42/12, gonna try a 42/14 next.

Any help would be greatly appreciated!
Maybe stupid but is the servo horn slipping?
__________________
Serpent Cobra E RTR, HB VE8, Summit, Vaterra Kemora/Kalahari, XRAY X10, XRAY X12
Buying and selling as tracks open and close
hoousi is offline   Reply With Quote
Old 02-28-2011, 04:06 PM   #2327
Tech Elite
 
macnkitty2002's Avatar
 
Join Date: Jun 2004
Location: Montgomery, AL
Posts: 4,923
Trader Rating: 7 (100%+)
Default

Quote:
Originally Posted by hoousi View Post
Maybe stupid but is the servo horn slipping?
the horn was slipping.
__________________
Team Associated RC10B4.2
Losi Rock Rey
macnkitty2002 is offline   Reply With Quote
Old 02-28-2011, 04:47 PM   #2328
Tech Apprentice
 
justbeastit's Avatar
 
Join Date: Aug 2010
Location: Greensboro, NC
Posts: 54
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by scooterman19 View Post
I am looking at the dynamite brushless set up with 5800kv they also have a 3300kv ....which one???? I will only be racing it....or do you guys have another less expensive set up in mind???? Any and all help is appreciated
I've been experimenting with high and low kv motors and I'm starting to lean towards running lower kv motors and upping the gearing. Things run a lot cooler, runtimes are longer, and the top end speed can easily be geared to be just as fast as a higher kv motor. If it were me, I'd go with the 3300kv setup.
justbeastit is offline   Reply With Quote
Old 02-28-2011, 04:49 PM   #2329
Tech Regular
 
scooterman19's Avatar
 
Join Date: Oct 2009
Location: Sicklerville, NJ
Posts: 420
Default

Quote:
Originally Posted by scooterman19 View Post
I am looking at the dynamite brushless set up with 5800kv they also have a 3300kv ....which one???? I will only be racing it....or do you guys have another less expensive set up in mind???? Any and all help is appreciated
I still havent figured out what kv means lol....what kv should you run in the TT with a 40C 2s and is 25c enough
scooterman19 is offline   Reply With Quote
Old 02-28-2011, 05:06 PM   #2330
Tech Apprentice
 
justbeastit's Avatar
 
Join Date: Aug 2010
Location: Greensboro, NC
Posts: 54
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by scooterman19 View Post
I still havent figured out what kv means lol....what kv should you run in the TT with a 40C 2s and is 25c enough
kV means how many thousand rpms per volt the motor will spin. So a 3000kV motor on a 2s (7.4v) lipo is 3000 x 7.4 = 22,200 rpms. In choosing the right kv motor for a vehicle there are so many choices and options. There is not a specific kv rating you should use but more of a kv range. I would say that anywhere between 2400kv to 5000kv would be acceptable. Some may disagree with me, but that's my opinion. The next question is what size pinions do you have. The lower the kv rating of a motor the larger the pinion will have to be to achieve a good top end speed. The opposite is true for a high rated kv motor. High kv motors generally use smaller pinions. Low kv motors have more torque and high kv motors have more top end. Hope this helps.
justbeastit is offline   Reply With Quote
Old 02-28-2011, 05:46 PM   #2331
Tech Regular
 
scooterman19's Avatar
 
Join Date: Oct 2009
Location: Sicklerville, NJ
Posts: 420
Default

Quote:
Originally Posted by justbeastit View Post
kV means how many thousand rpms per volt the motor will spin. So a 3000kV motor on a 2s (7.4v) lipo is 3000 x 7.4 = 22,200 rpms. In choosing the right kv motor for a vehicle there are so many choices and options. There is not a specific kv rating you should use but more of a kv range. I would say that anywhere between 2400kv to 5000kv would be acceptable. Some may disagree with me, but that's my opinion. The next question is what size pinions do you have. The lower the kv rating of a motor the larger the pinion will have to be to achieve a good top end speed. The opposite is true for a high rated kv motor. High kv motors generally use smaller pinions. Low kv motors have more torque and high kv motors have more top end. Hope this helps.
absolutely helps....thanks...I did find an ez-run set up 60amp 5.5 turn but it is a 6000kv....dunno what to get....also found another dynamite with 5000kv....drivin myself crazy lol....and does anyone recommend a good servo (cheap) again lol....btw this forum helps alot keep it up guys
scooterman19 is offline   Reply With Quote
Old 02-28-2011, 05:53 PM   #2332
Tech Master
 
prettyboy's Avatar
 
Join Date: Apr 2009
Location: Blackwood,N.J
Posts: 1,446
Trader Rating: 59 (100%+)
Default

If anyone is looking for a 10TT or know's somone looking Iam selling my with a bounch of parts and 2 sets of tires other then the stocks..
Check it out here Ofna Hyper 10TT F/S

Thanks and PM me with any questions..
__________________
(ORIGINAL) HIGH POWERED HOBBIES RACE TEAM MEMBER
prettyboy is offline   Reply With Quote
Old 02-28-2011, 09:17 PM   #2333
Tech Rookie
 
BADDAWG's Avatar
 
Join Date: Nov 2008
Location: logan U.T.
Posts: 3
Default

Alot of guys at my track are runing castles sct 3300kv 4 pole setup and is just as fast as my mm 5700kv setup and there teps are running about 100 deg. while mine are at about 150 to 170deg. and you cant go wrong with the cost ether at $129 and its a 4 pole motor wich means more torque and a little bit more run time. We have about 20 to 25 of this things run reguiraly and at least half of them are runing the sct 3300kv combo.
__________________
Jammin x2cr & x2crt / Hyper 10tt / Twisted metal R/C Chassis & Components
BADDAWG is offline   Reply With Quote
Old 02-28-2011, 10:30 PM   #2334
Tech Adept
 
Join Date: Dec 2010
Location: Orange County
Posts: 194
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by BADDAWG View Post
Alot of guys at my track are runing castles sct 3300kv 4 pole setup and is just as fast as my mm 5700kv setup and there teps are running about 100 deg. while mine are at about 150 to 170deg. and you cant go wrong with the cost ether at $129 and its a 4 pole motor wich means more torque and a little bit more run time. We have about 20 to 25 of this things run reguiraly and at least half of them are runing the sct 3300kv combo.
isn't it 3800kv?
__________________
HB Ve8 HHH
DirtyCookieX is offline   Reply With Quote
Old 02-28-2011, 10:34 PM   #2335
Tech Adept
 
Join Date: Dec 2010
Location: Orange County
Posts: 194
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by justbeastit View Post
I've been experimenting with high and low kv motors and I'm starting to lean towards running lower kv motors and upping the gearing. Things run a lot cooler, runtimes are longer, and the top end speed can easily be geared to be just as fast as a higher kv motor. If it were me, I'd go with the 3300kv setup.
would would you recommend for a 4.5T 550 (5000kv) motor?
__________________
HB Ve8 HHH
DirtyCookieX is offline   Reply With Quote
Old 02-28-2011, 11:01 PM   #2336
Tech Champion
 
thecman26's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jul 2006
Location: South Central Kansas
Posts: 7,685
Trader Rating: 98 (100%+)
Default

Quote:
Originally Posted by DirtyCookieX View Post
would would you recommend for a 4.5T 550 (5000kv) motor?
IDK, I run a 20T pinion on mine but I have the 550 6.5 motor in mine and it barely even warms up and runs like a freak! I would say start with a 15 or a 16 and watch the temps!
__________________
Chris Keen: Viola, Kansas
Kyosho RZ6, TLR 22 3.0, TLR 4.0 SR (soon),& 22T 3.0
"I'm too drunk to taste this chicken!", Col. Sanders
thecman26 is offline   Reply With Quote
Old 03-01-2011, 05:40 AM   #2337
Tech Master
 
1Fastpede's Avatar
 
Join Date: Aug 2010
Location: McKinney,TX
Posts: 1,640
Trader Rating: 45 (100%+)
Default

I run a 15T with a tekin 4.5/550
__________________
--
1Fastpede is offline   Reply With Quote
Old 03-01-2011, 05:49 AM   #2338
Tech Addict
 
Join Date: Nov 2009
Posts: 581
Default

I made lots of reseach and I dont get most of you guys...

when you attach a 6900 - 5800 kv motors with a lower gearing you will get good tranny torque with minimum motor torque making the truck or car slightly slow but with bullet fast acceleration.

but if you purchase a motor with less kv 3000-3500 with higher gearing you will get faster speeds barely less acceleration and much more control...

whats the point of purchasing so High kv motors?
__________________
Kyosho RT5, kyosho SC-R, Kyosho Mad force VE 8s, Tekno Sct410,
TMM-25063 x2 Pro & Neu 2230-12 (On the way)
pirape is offline   Reply With Quote
Old 03-01-2011, 05:50 AM   #2339
Tech Addict
 
Join Date: Nov 2009
Posts: 581
Default

Quote:
Originally Posted by thecman26 View Post
IDK, I run a 20T pinion on mine but I have the 550 6.5 motor in mine and it barely even warms up and runs like a freak! I would say start with a 15 or a 16 and watch the temps!
this is what im talking about and I would even recomend using a 7.5 with 24t pinion
__________________
Kyosho RT5, kyosho SC-R, Kyosho Mad force VE 8s, Tekno Sct410,
TMM-25063 x2 Pro & Neu 2230-12 (On the way)
pirape is offline   Reply With Quote
Old 03-01-2011, 05:58 AM   #2340
Tech Elite
 
heavyjeffd's Avatar
 
Join Date: Mar 2010
Posts: 2,796
Trader Rating: 15 (100%+)
Default

I run an 12t with a 6.5t 540 motor/esc, I'm going down to an 11t because it's too hot.
heavyjeffd is offline   Reply With Quote
Reply



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 07:39 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net