R/C Tech Forums

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

Like Tree1Likes
Reply
 
Thread Tools Search this Thread
Old 01-24-2017, 06:39 PM   #31
Tech Champion
 
DARKSIDE's Avatar
 
Join Date: Mar 2008
Location: Nashville-Memphis
Posts: 8,443
Trader Rating: 2 (100%+)
Default

and boom...

http://roarracing.org/4rmb/showthrea...T-W-11-12-2016
__________________
Myron "BATTMAN" Kinnard
Team Associated/Reedy Powered/PROTOform
2017 U.S.VTA+ Southern Nationals in Music City U.S.A.
Sept 21-24th @ Thunder RC Raceway
1172 Park Ave, Murfreesboro, TN 37129
DARKSIDE is offline   Reply With Quote
Old 01-24-2017, 08:39 PM   #32
Tech Fanatic
 
TOM MAR's Avatar
 
Join Date: Nov 2009
Location: Jacksonville, Florida
Posts: 989
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by DARKSIDE View Post
Naw, already posted that link. lol

But yeah And Boom.
TOM MAR is offline   Reply With Quote
Old 01-25-2017, 02:54 AM   #33
Tech Elite
 
howardcano's Avatar
 
Join Date: Jan 2012
Location: Olathe, KS
Posts: 3,543
Trader Rating: 35 (100%+)
Default

Quote:
Originally Posted by DARKSIDE View Post
Quote:
Originally Posted by TOM MAR View Post
Try this...


http://roarracing.org/4rmb/showthrea...T-W-11-12-2016

I think these should work, they worked for me & I am not a current member.

Tom
Neither worked for me. I'm guessing the problem is on my end, though I haven't the slightest idea why!
__________________
Howard Cano
When race results are re-calculated using the IOF (Index Of Fun), I always win.
1993 ROAR 1/8 Pan National Champion
howardcano is offline   Reply With Quote
Old 01-25-2017, 03:47 AM   #34
Tech Adept
 
massenb203's Avatar
 
Join Date: Jul 2016
Location: Fayetteville, NC
Posts: 150
Default

ROAR New Approved motors

http://roarracing.org/4rmb/forumdisp...ec-25-5-Motors
__________________
Henry Massenburg

Team C Racing USA, TC10 2015
Ho-B Max RC Park
massenb203 is online now   Reply With Quote
Old 01-25-2017, 04:44 AM   #35
Tech Adept
 
Join Date: Apr 2016
Posts: 150
Trader Rating: 1 (100%+)
Default

That link is getting a real workout.
djgrom is offline   Reply With Quote
Old 01-25-2017, 06:14 AM   #36
Tech Elite
 
theproffesor's Avatar
 
Join Date: Feb 2005
Location: Lugoff SC
Posts: 2,722
Trader Rating: 56 (100%+)
Default

So the question is...

If the minimum resistance spec will keep these new 25.5 motors from doing what the new 21.5 and 17.5 motors have done.

I'm hoping that it does what was intended and keeps the motors on par with each other, not only from one manufacturer to another, but from generation to generation as well.
__________________
Associated - Fantom - Savox - Hobbywing - Spectrum.
The brighter the picture, the darker the negative. USVTA member #112
theproffesor is offline   Reply With Quote
Old 01-25-2017, 07:16 AM   #37
Tech Elite
 
howardcano's Avatar
 
Join Date: Jan 2012
Location: Olathe, KS
Posts: 3,543
Trader Rating: 35 (100%+)
Default

Quote:
Originally Posted by theproffesor View Post
So the question is...

If the minimum resistance spec will keep these new 25.5 motors from doing what the new 21.5 and 17.5 motors have done.

I'm hoping that it does what was intended and keeps the motors on par with each other, not only from one manufacturer to another, but from generation to generation as well.
It's a big step in that direction. There are a few other things that should be addressed in the next rules update, but none are as large an influence.
__________________
Howard Cano
When race results are re-calculated using the IOF (Index Of Fun), I always win.
1993 ROAR 1/8 Pan National Champion
howardcano is offline   Reply With Quote
Old 01-25-2017, 12:54 PM   #38
Tech Elite
 
hotrodchevy14's Avatar
 
Join Date: Dec 2009
Posts: 2,372
Trader Rating: 106 (100%+)
Default

go with fantom or better
yet motiv
__________________
...oh our lady of blessed acceleration, don't fail me now..
sponsored by:Team lint in my pockets racing...
hotrodchevy14 is offline   Reply With Quote
Old 01-25-2017, 01:18 PM   #39
Tech Apprentice
 
Join Date: Dec 2014
Posts: 87
Default

Whatever you get, make sure it has a 12.3 rotor which is the only legal one.

I was looking to buy a new VTA motor recently and I was considering the Hobbywing XeRUN V10, but every online spec I could find (including Hobbywing North America's website) says it only comes with a 12.5 rotor. So that leads me to believe that anybody running one straight out of the box would be illegal. I looked up the rotor part number listed on the ROAR site (http://roarracing.org/4rmb/showthrea...101-05-31-2016) and it says it is a 12.5 rotor.

The other Hobbywing motor on the approved list (Just Stock 3650) appears to come with a 12.3 rotor only which would make it legal. However, it has fixed timing which I think would make it useless for racing.
microed is offline   Reply With Quote
Old 01-25-2017, 02:08 PM   #40
Tech Adept
 
Join Date: Jul 2009
Posts: 175
Default

Quote:
Originally Posted by jlfx car audio View Post
All this is true . But the one veritable companies can do is improve on rotor strength .. the Novak rotors are old technology 1200-1300ish rotors (12.3mm)
Newer motor are using new processed to get motors in the 1750 range motiv (12.5mm)
Only other rotors that come close is the TSR @ 1650ish (12.5mm)
So given this info I would be looking at TSR/motiv for their new style motors bacause there new can design is much lighter and rotor strength is much higher than other brands at the moment ... That's why those 2 companies would be my first choice
Most of the rotor testers I've seen (including the one I built) place the rotor in "V" blocks a fixed distance from the sensor. The 12.5 rotor will read as stronger simply because it is closer to the sensor. It may not actually be better magnetic material (and they're illegal anyway in VTA).
Kevin Marcy is offline   Reply With Quote
Old 01-25-2017, 02:22 PM   #41
Tech Elite
 
jlfx car audio's Avatar
 
Join Date: Nov 2007
Location: jackson,tn
Posts: 3,322
Trader Rating: 36 (100%+)
Default

Quote:
Originally Posted by Kevin Marcy View Post
Most of the rotor testers I've seen (including the one I built) place the rotor in "V" blocks a fixed distance from the sensor. The 12.5 rotor will read as stronger simply because it is closer to the sensor. It may not actually be better magnetic material (and they're illegal anyway in VTA).
i agree they do read higher but a normal 12.5 rotor reads 1400ish but the newer tsr,motiv are 1640-1750
apply that same tech to the 12.3 rotor and your looking at a 1400+ 12.3 and thats just guessing .
__________________
Justin & Matt Lyons
Awesomatix USA, EA motorsports, Sanwa, Protoform, Avid, Gravity Rc , TSR!
a800s sanwa m12s
jlfx car audio is offline   Reply With Quote
Old 01-25-2017, 02:26 PM   #42
Tech Master
 
Kregger's Avatar
 
Join Date: Jun 2006
Location: Long Island, NY
Posts: 1,102
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by DARKSIDE View Post

I asked because the OP was asking about the D4.
Unless I read it wrong the D4 25.5 is being listed as roar approved.
Kregger is offline   Reply With Quote
Old 01-25-2017, 03:02 PM   #43
Tech Master
 
Join Date: Feb 2014
Location: Kirkland, WA
Posts: 1,004
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by Kregger View Post
I asked because the OP was asking about the D4.
Unless I read it wrong the D4 25.5 is being listed as roar approved.
Definitely not ROAR approved. The 24k is though.
__________________
-Mike B.
Carnage9270 is online now   Reply With Quote
Old 01-25-2017, 03:11 PM   #44
Tech Master
 
Join Date: Feb 2014
Location: Kirkland, WA
Posts: 1,004
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by jlfx car audio View Post
All this is true . But the one veritable companies can do is improve on rotor strength .. the Novak rotors are old technology 1200-1300ish rotors (12.3mm)
Newer motor are using new processed to get motors in the 1750 range motiv (12.5mm)
Only other rotors that come close is the TSR @ 1650ish (12.5mm)
So given this info I would be looking at TSR/motiv for their new style motors bacause there new can design is much lighter and rotor strength is much higher than other brands at the moment ... That's why those 2 companies would be my first choice
There's no new technology to applying a magnetic charge to magnetic material. What is changed is how much magnetic material is present. This gives the torque you are referring to. Mod rotors use more magnetic material than a stock rotor, that's why the gauss rating is so high. The reason TS and Motiv are using such high gauss rotors is because of the way the stator is made. They are extremely high rpm stators, this needs to be compensated with a really high gauss rotor. The combination works well, but it's not applicable to a 25.5 quite the same way. A 25.5 stator is far from an "RPM" stator like the short stacks.

The only way to increase the gauss rating on a 12.3 rotor is to increase the length of the magnetic material. But roar defines how long that can be (25 to 26mm) as well as the diameter (12.3). So there's not much wiggle room in the rotor department. Like I said earlier, it all comes down to how close to the legal limit the stator is. And frankly speaking, at 101 pole to pole, unless a motor is way off (like 120) you won't notice a whole lot on a 25.5.

The true measure of a 25.5 at this point, at least for me, is material quality. (stator material, wire material, sensor units, case etc). This is where I see a huge difference between manufacturers.
__________________
-Mike B.

Last edited by Carnage9270; 01-25-2017 at 03:34 PM.
Carnage9270 is online now   Reply With Quote
Old 01-25-2017, 04:40 PM   #45
Tech Champion
 
Join Date: Feb 2011
Posts: 6,079
Trader Rating: 1 (100%+)
Default

I guess 25.5t motors will be getting alot of attention from now on, but wouldn't it be better to gain power by reducing the car's rotational mass instead ???
bertrandsv87 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
U.S. Vintage Trans-Am Racing Part 2 IBLib Electric On-Road 10715 Today 01:25 PM
Novak Havoc 2S with Trinity Monster Locked? Delawareguy Electric On-Road 6 12-05-2011 01:59 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 02:48 PM.


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