R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-15-2009, 03:19 AM   #916
Tech Regular
 
GWH74's Avatar
 
Join Date: Jan 2009
Location: Adelaide
Posts: 254
Trader Rating: 13 (100%+)
Default Yeah Racing brushless

Hi silverfrancis

The Yeah Racing brushless are avaliable at harrisrc or feralbatteries. They are the same as the hobbywing units. The 13T is the spec system for mini racing (i run one in mine). It is a 380 size rotor and windings in a larger case so it can be mounted in place of a 540 can. If geared ring this do go hard for the price with the added benefit of have an inbuilt heat sink.

When they talk about the number of cells that the ESC can handle it is looking at the maximum voltage before damage will occur and the minimum voltage before there is not enough voltage for the control circuitry to operate.
Most ESC will run off a single cell IF the control side of the circuity is driven off the correct voltage. The battery is connected so it drives FETs. As long as the drive singles is correct to the FETs the current will flow through the FETs evern at these low voltages. This is the reason why a receiver pack or voltage booster is use and the switch is left off (when on it tries to power the circuit through the BEC). This booster supplies the voltage to the brain of the ESC through the connection to the receiver this in turns drives the FETs at the correct voltage. Some ESC will run down to the lower voltage of the single cell without the booster but servo will be slower then at 5v.

You SHOULD be able to run these YR / HW brushless if you use a booster. You will need to turn the Low Voltage Cut-Off to "Non-Protection" as it is designed for 2-3 cells and will detect the sigle cell as a very flat 2-cell battery. Therefore you need a "Lipo Guard" or stop as soon as it starts to drop performance or you will damage the cell.

Good luck and once my single cell battery comes in i will give my hobbywing a try and report back.
If it does work makes a very cheep entry point.

Gareth
GWH74 is offline   Reply With Quote
Old 05-15-2009, 03:24 AM   #917
Tech Regular
 
GWH74's Avatar
 
Join Date: Jan 2009
Location: Adelaide
Posts: 254
Trader Rating: 13 (100%+)
Default 1-cell and brushed

Thanks PutAwayWet.

That's what i thought. 19T may have been too much. I have a few 27T that i will try for some fun.
I see you have a Novak GT7 ESC, are you running a voltage booster?
GWH74 is offline   Reply With Quote
Old 05-29-2009, 08:02 AM   #918
Moderator
 
Clegg's Avatar
 
Join Date: Jan 2004
Location: Outside doing things in places... Denver, CO
Posts: 4,609
Trader Rating: 9 (100%+)
Default

So I picked up a Novak Smart Boost to run with my SMC pack... and the thing sucks. Not sure if I have a bunk one or what.

My electronics:
4 Cell Novak GTB SS
Airtronics Rx (FHSS 2.4)
MRT PT
Futaba 9650 Servo
Team Orion 10.5 Vortex motor
SMC 4000mAh 1S LiPo.
Novak Smartboost soldered to the +/- Tabs of the ESC where the battery leads run to. The ESC power switch removed. and the Smartboost plugged into the Aux port on the ESC.

What happens:
Any time I jerk the throttle and then lift, the smartboost "reboots". I get the flashing red light, and I lose all power to my Rx. The Rx comes back in a few seconds, but its like there is a power dip to the point the RX just goes goodbye for a few seconds. It also causes the ESC to slam the brakes on.

I took out the Smart boost and put in my $4.00 Hobby King booster... and everything works great.

going to send the Smart Boost into Novak to see if I have a bad copy... but I gotta say... if a 4 or 5$ chineese made POS can run laps around your $40.00 overly complex, too heavy, too big booster... thats a bad deal.

The Smart Boost is over 2x as heavy as the HK booster Also and hard as hell to fit on a 1/12th chassis.
__________________
Joe Kelly - JK720.net
5280 Raceway |5280raceway.com | 5280 Raceway Facebook
Clegg is offline   Reply With Quote
Old 05-29-2009, 08:14 AM   #919
Tech Master
 
Join Date: Nov 2003
Posts: 1,052
Trader Rating: 16 (94%+)
Default

Quote:
Originally Posted by Clegg View Post
So I picked up a Novak Smart Boost to run with my SMC pack... and the thing sucks. Not sure if I have a bunk one or what.

My electronics:
4 Cell Novak GTB SS
Airtronics Rx (FHSS 2.4)
MRT PT
Futaba 9650 Servo
Team Orion 10.5 Vortex motor
SMC 4000mAh 1S LiPo.
Novak Smartboost soldered to the +/- Tabs of the ESC where the battery leads run to. The ESC power switch removed. and the Smartboost plugged into the Aux port on the ESC.

What happens:
Any time I jerk the throttle and then lift, the smartboost "reboots". I get the flashing red light, and I lose all power to my ESC. The ESC comes back in a few seconds, but its like there is a power dip to the point the RX just goes goodbye for a few seconds. It also causes the ESC to slam the brakes on.

I took out the Smart boost and put in my $4.00 Hobby King booster... and everything works great.

going to send the Smart Boost into Novak to see if I have a bad copy... but I gotta say... if a 4 or 5$ chineese made POS can run laps around your $40.00 overly complex, too heavy, too big booster... thats a bad deal.

The Smart Boost is over 2x as heavy as the HK booster Also and hard as hell to fit on a 1/12th chassis.
I picked up a couple myself right after they became available, and I felt the car went softer at the end of the race more so than with a separate receiver battery, and removed them. I agree they are large, but they fit perfectly on top of most 1/12 servos, but at 8 grams, they aren't to heavy. I'm able to get to 730 grams with a LiPo Regulator and LiPo receiver battery, weighing 20 grams combined.

One feature the Novak has that others don't is a low-voltage LiPo cutoff. If the primary battery voltage is below 3.3v, it cuts power. So if you were testing on a main battery that was close to the Novak LiPo 3.3v cut-off limit, this could be the cause of what you experienced.

What I currently use with my SMC 4000 LiPo's is a 150mah LiPo 7.4v Receiver battery, and than a Losi Receiver LiPo voltage regulator. The regulator provides me a solid 6.0v to the servo at all times, which ensures that the servo doesn't speed up or slow down in relation to the receiver battery voltage.
kn7671 is offline   Reply With Quote
Old 06-09-2009, 07:02 AM   #920
Tech Master
 
PartTime's Avatar
 
Join Date: Mar 2008
Location: Sterling hts MI
Posts: 1,029
Trader Rating: 10 (100%+)
Default

Jeremy Otis.... You have PM.

Ok, anybody try any of the new speedos out there in 1/12th? I dropped a SPX in last night. Still have a few things to clean up but mostly there. Looks like wed will be the first race for this. I have had one guy say he didnt notice a diffrents but, I consider the source.

DK
PartTime is offline   Reply With Quote
Old 06-09-2009, 10:46 AM   #921
Tech Master
 
Join Date: Jul 2004
Location: MI
Posts: 1,544
Trader Rating: 1 (100%+)
Send a message via AIM to John St.Amant Send a message via MSN to John St.Amant Send a message via Yahoo to John St.Amant
Default

I'm still not sold on the whole booster thing.
I know its an extra 30 grams or so but the weight is well worth knowing that my receiver and most of all my servo will have 6v.. I use a 2 cell 350mAh Li-Po and a Losi voltage regulator. In World GT its good for the evening on one charge.
I would imagine it would need a recharge for four or more eight minute runs.
Question is , where do I put this on my 12th scale?
__________________
Pro-Line Racing , Boca Bearings , Competition Heat.
Team Durango DEX210, DEX410V3, DESC410R, DNX408
Futaba FAAST 2.4 4PkS, LRP, Tekin, Xcellorin
John St.Amant is offline   Reply With Quote
Old 06-09-2009, 01:48 PM   #922
Tech Addict
 
rack's Avatar
 
Join Date: Mar 2009
Posts: 501
Trader Rating: 65 (100%+)
Default

Quote:
Originally Posted by PartTime View Post
Jeremy Otis.... You have PM.

Ok, anybody try any of the new speedos out there in 1/12th? I dropped a SPX in last night. Still have a few things to clean up but mostly there. Looks like wed will be the first race for this. I have had one guy say he didnt notice a diffrents but, I consider the source.

DK
I am using a LRP SPX with a 13.5 hacker and a TQ booster . The car is just a little faster than a 17.5 with 4cell nimh.
rack is offline   Reply With Quote
Old 06-09-2009, 02:47 PM   #923
Tech Master
 
Join Date: Nov 2003
Posts: 1,052
Trader Rating: 16 (94%+)
Default

Quote:
Originally Posted by rack View Post
I am using a LRP SPX with a 13.5 hacker and a TQ booster . The car is just a little faster than a 17.5 with 4cell nimh.
Your setup is not quite there yet if you think it only a "little faster", as there is a much greater difference between 17.5 4-cell and 13.5 1-cell.

When our track started converting to 17.5 1-cell LiPo from 17.5 4-cell NiMH, we were about .1 to .2 seconds slower with a 17.5 1-cell LiPo car. With our 13.5 1-cell class our cars are seeing laptimes almost 1-second faster or more than 17.5 1-cell, or .8 seconds faster than 17.5 4-cell. This would boil down to 2-3 laps extra per race with a properly setup 13.5 LiPo car, and should not even be considered anywhere near close to 17.5 4-cell NiMH car.

We are seeing our rollouts for 17.5 1-cell in the 95-105mm range, while 13.5 1-cell is in the 80-90mm range. Fast Laptimes for 17.5 1-cell are 15.1's, while 13.5 1-cell is 14.3's. For an extreme example of the 13.5 power, Mike Dumas races with us and is able to get his 13.5 SpeedMerchant Rev5L down into the 13.6's.

Once the SMC 5000mAh 40C 3.7v batteries come out, I would expect to see even more improvement in overall laptimes to their NiMH counterparts, especially in 13.5, Mod, and WGT.
kn7671 is offline   Reply With Quote
Old 06-09-2009, 03:36 PM   #924
Tech Master
 
Join Date: Jul 2004
Location: MI
Posts: 1,544
Trader Rating: 1 (100%+)
Send a message via AIM to John St.Amant Send a message via MSN to John St.Amant Send a message via Yahoo to John St.Amant
Default

And as we run pack after pack and figure out something else to get another tenth off or two. Before you know it your faster than that ,
__________________
Pro-Line Racing , Boca Bearings , Competition Heat.
Team Durango DEX210, DEX410V3, DESC410R, DNX408
Futaba FAAST 2.4 4PkS, LRP, Tekin, Xcellorin
John St.Amant is offline   Reply With Quote
Old 06-09-2009, 03:48 PM   #925
Tech Master
 
sportpak's Avatar
 
Join Date: Oct 2006
Location: Ft Wayne, IN
Posts: 1,314
Trader Rating: 26 (100%+)
Default

Quote:
Originally Posted by John St.Amant View Post
And as we run pack after pack and figure out something else to get another tenth off or two. Before you know it your faster than that ,
And then stock is too fast again...
__________________
-Tamiya TA05-R - Tamiya M05 - Summit Raceway Ft. Wayne, IN

www.summitrcraceway.com
sportpak is offline   Reply With Quote
Old 06-09-2009, 03:49 PM   #926
Tech Master
 
Join Date: Jul 2004
Location: MI
Posts: 1,544
Trader Rating: 1 (100%+)
Send a message via AIM to John St.Amant Send a message via MSN to John St.Amant Send a message via Yahoo to John St.Amant
Default

Quote:
Originally Posted by sportpak View Post
And then stock is too fast again...
And they tell 2 friends ....
__________________
Pro-Line Racing , Boca Bearings , Competition Heat.
Team Durango DEX210, DEX410V3, DESC410R, DNX408
Futaba FAAST 2.4 4PkS, LRP, Tekin, Xcellorin
John St.Amant is offline   Reply With Quote
Old 06-09-2009, 06:23 PM   #927
Tech Master
 
PartTime's Avatar
 
Join Date: Mar 2008
Location: Sterling hts MI
Posts: 1,029
Trader Rating: 10 (100%+)
Default

Just spent the last two nights getting this car ready for wed night race. This is what I have so far. A few things I want to change but looks like this is how it will get run for now.

Finished off at 734 grams. It was 697 before the gold brick next to the speedo. Had to balance it, right?

DK
Attached Thumbnails
SMC 4000/25C/3.7V single cell Hardcase pack.-r5-1.jpg   SMC 4000/25C/3.7V single cell Hardcase pack.-r5-2.jpg   SMC 4000/25C/3.7V single cell Hardcase pack.-r5-3.jpg  
PartTime is offline   Reply With Quote
Old 06-12-2009, 05:22 PM   #928
Tech Addict
 
rack's Avatar
 
Join Date: Mar 2009
Posts: 501
Trader Rating: 65 (100%+)
Default

Quote:
Originally Posted by Mr. Blonde View Post
I knew this question would come up
Ok, I ran the pack on one side...all the other stuff on the other....
It was no problem, balance was ok...I simply use doubleside tape
to fit the pack.

But....I got a proto S120L in da house...which I will test this weekend...
We actually will offer both S120 and S120L

So we are ready for both....NimH or Lipo...
Markus
So when can we see this s120L chassis that we have been hearing about.
rack is offline   Reply With Quote
Old 06-12-2009, 07:00 PM   #929
Tech Master
 
chicky03's Avatar
 
Join Date: Mar 2002
Posts: 1,993
Trader Rating: 1 (100%+)
Send a message via AIM to chicky03
Default

Quote:
Originally Posted by rack View Post
So when can we see this s120L chassis that we have been hearing about.
Here's a little preview to check out!!

The rest of it can be found here on the Serpent data base:
http://www.flickr.com/photos/rocsdt/256802327/
Attached Images
 
__________________
Serpent America, Picco, Desoto Racing, Motiv, J Concepts, Nitro Pro fuel, PT RC Racing Oils, TQ Wire(best wire ever!), BSR tires, Arrowmax, Xceed, Sanwa, Amain Hobbies, MIP, Getcustomized, EZ Customs

Last edited by chicky03; 06-12-2009 at 07:19 PM.
chicky03 is offline   Reply With Quote
Old 06-12-2009, 07:28 PM   #930
Tech Elite
 
seaball's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2001
Posts: 4,303
Trader Rating: 9 (100%+)
Send a message via Yahoo to seaball
Default

Quote:
Originally Posted by chicky03 View Post
The rest of it can be found here on the Serpent data base:
http://www.flickr.com/photos/rocsdt/256802327/
you've learned from the best, my friend. lol. (that never gets old for me)
__________________
*** The Gate II - Home of Mike Wise ***
seaball is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
The future of 1/12 scale Roland S Electric On-Road 1004 06-16-2017 02:04 PM
SMC 5700mAh 25C Single Cell Lipo Danny/SMC Electric On-Road 352 05-14-2009 04:03 AM
Trackside 1/12th scale racing Ike Wisconsin & Illinois Racing 41 03-31-2009 11:42 AM
ROAR 1/12 weight limit miller tyme Electric On-Road 171 01-09-2009 04:14 PM
Why choose LiPo? wingman2 Electric On-Road 16 12-17-2008 06:51 PM
1/12 lipo the mighty thor Electric On-Road 7 12-07-2008 03:01 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 06:39 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