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This is a place to share knowledge related to 1/12th scale racing. It is not to be used for conversations.

KITS:
Click links to go to manufacturer product page. If any are missing please add them!

TIRES:
Pre-mounted tires readily available in the US:
Pre-mounted tires readily available in the Europe:
  • Hot Race ??

Gluing your own donuts:
https://www.youtube.com/watch?v=hm7z1rz-74s - Special thanks to Edward Pickering!
Truing tires:
https://www.youtube.com/watch?v=8wqHOLWq6Uc - Special thanks to Edward Pickering!

The following information came from HERE, with some editing and information added. Thanks Christian!

THIS MAY NEED UPDATING FOR THE NEW BLACK CRC CARPET

Brands:
BSR, CRC, Jaco:
Pro One is no longer selling to the public, but it and the brands above are all mounted by BSR and use the same foam. The nomenclature of the BSR vs Jaco/CRC is a little different in a few instances but is otherwise the same. The BSR foam consists of three families, and can be identifed as synthetics, naturals, and blends.

Synthetics - The old school, light weight, easy to true "dry feeling" tires. These include tires like CRC/Jaco Yellow (BSR White), Black, Gray, etc. These tires offer the highest wear rate and lowest grip. Many racers continue to use these nder high bite conditions.

Naturals - These tires are usually the best alternative for low bite and asphalt. They include Pink, Magenta, Double Pink, Lilac (BSR Team Purple), Purple, and other tires. These tires provide a ton of grip, but tend to get sticky in high bite conditions. This rubber does not wear as easily, and the cars will pick up gunk and fibers from the carpet under most high bite conditions. This is especially bad if the humidity is high.

Blends - These are the tires most people run today. They were initially called "JFT foam" by some, as it was believed that the tires were the same as the JFT tires. We can divide the blends further into two groups: high rubber and low rubber content. The high rubber would be the new rear Orange and Red from the BSR family, and the low rubber would be the Green and Blue varieties. When, asked about the difference, John Foister from BSR Tires said they came from the same "family" of foam, but they offered different grip. According to John, the Green/Blue has more bite than Orange/Red, but from track testing Oranges offer more bite than Green (being equivalent to in hardness) when the grip is high and absolutely no grip when it is lower. The Orange foam has a denser pore structure and the tire is not as prone to chunking. It is also important to note is that BSR Blue rears are not the same as the BSR Blue fronts!

JFT:
JFT stands for Japan Foam Tire. They started the new wave of foam tires we are all using now (Blue/Blu, Green/Greene, Dbl Blue, etc). These tires are a little different than the BSR tire family, but work in very similar conditions. They offers four varieties A (asphalt), C (carpet), S (???), and R (???). This does not mean that those types only work on that surface, but this is what they recommend.

JFT uses the same foam for fronts and rears if the color is the same.

A: Used on asphalt, considered close to the natural rubber variety and are named consistently with other natural tires.
C: Used on carpet, considered a blend.
S: Used on carpet?, tires are ???
R: Used on carpet?, tires are ???

For setup, the JFT foam seem to generate more bite than the BSR, therefore the car tends to be a little more aggressive.

Ulti:
Ulti is another Japanese brand that offers an array of compounds. They have their own way of rating tires, and are difficult to equate to other brands. They have 4 different varieties, each in varying degrees of hardness.

J: High rubber content tire, similar to Pink/ Magenta. Soft would be close to a pink. These offer the most bite and are great for asphalt/carpet front tire. (J hard being very popular)
X: "Balanced" blend, similar to JFT Blue/ Green. Soft is equivalent to Green, medium to Blue in hardness. Great for carpet!
Y: High synthetic blend with lower grip, and is not a very popular variety.
Z: A very expensive "special" foam that is supposed to be magic on asphalt. Only make it in soft shore.
European tires:
There are many great European foam tire brands that use their own types of foam, as well as traditional foams. SOmeone with more knowledge about them will need to fill this in!

Tire Diameter:
If you are racing on carpet, you have to evaluate how much grip your track has. If your track is low to medium grip, you can run bigger tires. If you are on higher bite you have to cut them smaller, there is simply no way around it. Bigger tires are needed for asphalt, especially in the rear. The larger tires provide much needed lateral bite.

Carpet (mm):
Low - Medium Bite
Front: 42.0 - 42.5
Rear: 42.5 - 43.00
Medium - High Bite
Front: 40.5 - 41.0
Rear: 41.5 - 42.0
Big Race
Front: 39.5 - 40.0
Rear: 40.5 - 41.0
Asphalt (mm):
Parking Lot
Front: 43.0 - 44.0
Rear: 44.0 - 45.0
Prepped High Bite
Front: 42.0 - 43.0
Rear: 43.0 - 44.0

Tire Saucing:
Most facilities have moved towards odorless traction additives such as SXT. Some of additives evaporate very quickly and some do not. This seems to be something that is also dependent on tire compound and ambient temperature. For example, saucing a Green compound seems like it never dries, especially when tjhe temperature is lower. We have found that wiping the tires off 15 minutes before we go run allows the sauce to cure, which makes the car come in much quicker with Green rears. Blue compounds on the other hand, do fine when wiped off right before hitting the track.

Saucing half front and full rear is a good initial starting point. If the front of the car is too agressive you can sauce les than half, or for a shorter amount of time.
Tire Fuzzing:
In conditions of increasing grip, foam tires will somewtimes get sticky and pick up fuzz and debris from the track. This is highly dependent on the rubber sedan tire that is being run at your local track and the compound/ type of foam you are running on you car. The softer the sedan tire and the harder/higher rubber content in your foam tire, trouble with fuzzing seems more likely to occur.

There are ways to get around fuzzing under most conditions, and usually involves the selection of the correct foam compound. The more fuzz you get, the softer/lower rubber content you want to run.

Examples:
Problem: Car fuzzes with Lilac/Team Purple fronts and car starts pushing.
Solution: Use a softer front tire and or different family of foam. Replace it with Blue or Double Blue front.

Problem: Car loses rear bite 6 minutes into the run. Blue rear tires look almost clean but have small carpet hairs.
Solution: Use Green rear tires. The softer compound wears instead of getting sticky, minimizing fuzz.

Tire Selection:
Starting out, pick 2 tire compounds for the front and rear. The following should have you covered 99% of the time.

Front - Green and Blue (BSR) or Green and Light Blue (JFT)
Rear - Blue and Double Blue (BSR) or Blue and Dark Blue (JFT)

You may wonder about other compounds out there and if they might be better, trust me, they probably won't be. Even if there are other tires that can be as fast, the synthetic family wears out really fast and the high natural rubber will probably fuzz on you over an 8 minute run. The blends family seems to be the most versatile foam type available today. They last awhile, and sticking to them will make your process of tire selection simpler.
Tire Charts:
BSR/CRC/Jaco



Contact



Corally



JFT (Japan Foam Tire)



Ulti



Enneti (Xceed)



ELECTRONICS:
ESC:
As of now, ROAR is staying 1S (3.7V nominal; 4.2V fully charged) for 1/12. There are many 1S ESC's with a built in BEC so nothing else is required to power the receiver and servo.

If you don't want to lock yourself into a 1S specific ESC, you do have other options! It is possible to use your 2S ESC without a booster or receiver pack, and the ESC simply supplies the lower voltage. If that does not appeal to you, you will need to use an Rx pack or booster. The Rx pack and booster will both supply the receiver with a higher voltage than the 1S pack.

If you decide to use an Rx pack, MAKE SURE TO REMOVE THE RED WIRE FROM THE ESC PLUG THAT GOES INTO THE RECEIVER!!!

If you choose to use a voltage booster, it works exactly how it sounds. Instead of plugging the ESC into the receiver, it plugs into the booster, and the booster plug goes to the ESC, supplying the higher voltage.

1S ESC:
If there are any missing please add them!!

If anyone would like a need for a chart comparing the ESC's specs PM fenton06 and I'll get one made and put in here!
Voltage Boosters:
If there are any missing please add them!
Servos:
BODIES:
Black Art (CRC - US Dist):
  • Audi R8C - BA002 - .020 Thick



  • Black Market (Mohawk 12) - BA005 - .020



  • Lola B10 - BA006 - .020 thick
  • Toyota TS030 - BA008 - .020 thick

    Lola - black/red, TS030 - green/pink


PROTOForm:

Reflex Racing/RSD:

SUSPENSION ADJUSTMENTS:

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Old 10-09-2009, 10:46 AM   #32386
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Testing here showed that with the same gearing a 1s / 13.5 was VERY close to the same as a 4-cell / 17.5. But when we started gearing the 1s / 13.5 up to where it was optimized it was significantly faster than the 4-cell / 17.5 is.

I know the W. Washington guys (Bodine, DuTemple, et al) have decided that 1s / 13.5 and 4-cell 13.5 run together acceptably well. The Fantasy World Summer Sizzler (25th Annual!!) allowed either of these specs and the main proved to be a duel between Mike with a 4-cell car vs. Brian with a 1s car. Bodine made a small mistake early and spent 6 minutes running several seconds behind but the gap was pretty much the same throughout. With 1 minute to go the 4-cell car began to slow noticeably (geared pretty aggressively to keep ahead of the BodineMachine) to near full dump at the end where he won by a second or so. Had the race been even one more lap (heck...one more corner) and Brian would have had him.
I would like to point out this was on asphalt out doors on a 80x 120'ish medium turn type track. Take this scenario to a 40x90 carpet track and I feel that you will see the 4 cell car has a .2ths advantage. Moral to the story is; even with weight allowances, I don't think that you will achieve a true evenness between 4 cell & 1S.

I can say that for those that are holding onto their 4 cells..... let 'em go! The 1S pack is the brushless motor of batteries. It's true that we are giving up on the best cells that we have had since the Sanyo 2000's, but get over it. You will be happier for it.

Brian
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Old 10-09-2009, 10:55 AM   #32387
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Originally Posted by Slapmaster6000 View Post
I would like to point out this was on asphalt out doors on a 80x 120'ish medium turn type track. Take this scenario to a 40x90 carpet track and I feel that you will see the 4 cell car has a .2ths advantage. Moral to the story is; even with weight allowances, I don't think that you will achieve a true evenness between 4 cell & 1S.

I can say that for those that are holding onto their 4 cells..... let 'em go! The 1S pack is the brushless motor of batteries. It's true that we are giving up on the best cells that we have had since the Sanyo 2000's, but get over it. You will be happier for it.

Brian
Anytime I can pick up 2 tenths on you I am happy. Makes for some pretty equal racing.
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Old 10-09-2009, 04:10 PM   #32388
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Anytime I can pick up 2 tenths on you I am happy. Makes for some pretty equal racing.
I need 20 tenths to make it close...
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Old 10-09-2009, 06:54 PM   #32389
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Default 3 cell nimh vs 1S???

20 tenths Next you'll be asking for 2 seconds!


You know, just for conversation..... has anyone tried 3 cell nimh against the 1S format with equal running weight? I know that you would have to go through all the booster/rx pack stuff for the 3 cell car, but would it ease the transition of the nimh guys into 1S and keep a club from splitting up the 12th scale classes?

Let's just suppose there is a club the runs about a dozen 12th scale cars, some are moving over to 1S while the others are left behind due the economy or what ever. I would guess that you could have the 4 cell guys drop a cell and have the new minimum weight be something like 800g for everyone. Sure, there will be some weight balancing to do in the chassis, but could it work? Will chargers correctly peak off 3 cells? The idea is.... a 4 cell guy would have just a few more race packs. And when the time comes, the switch over to 1S wouldn't be drastically different to the equipment once the budget allows it.
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Old 10-09-2009, 07:36 PM   #32390
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Default 3 cell

Brian.......you just had to ask didn't you

Current Wisdom on 1s Lipo 1/12th Scale

Quote:
Originally Posted by ammdrew View Post
There is no equal way to race 4 cell and lipo. The motor combo or wt combos do not work well and the corner speed vrs the accel points are so different it is a very hard battle.

We started testing early this year running 3 cell nimmh and single lipo.... Logically we run a 6 cell or 2 cell lipo in a sedan and wt equal we all have agreed they Are equal on the track. Well long story short 3 cell nimmh and single lipo are exactly that equal... And very easy to balance 3 cells in a tbar car so no reason to feel you need to upgrade a chassis just lop a cell off rebalance and have all the gains of lipo. Lower tire wear and all.

here are a couple vids from our 12th stock 17.5 mixed lipo and 3 cell nimmh. Club size track 36 x 60.
http://www.youtube.com/watch?v=sFyOVqN7oqI
http://www.youtube.com/watch?v=MKjS5Ii1yBo
http://www.youtube.com/watch?v=0NB7q3NQb9k
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Old 10-09-2009, 07:45 PM   #32391
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20 tenths Next you'll be asking for 2 seconds!
You pass. The kids LOVE it when I give "improper fractions" and they can catch me on it. See, you're not getting older...you're just like my 12-13 yo students!!

Quote:
Originally Posted by Slapmaster6000 View Post
You know, just for conversation..... has anyone tried 3 cell nimh against the 1S format with equal running weight? I know that you would have to go through all the booster/rx pack stuff for the 3 cell car, but would it ease the transition of the nimh guys into 1S and keep a club from splitting up the 12th scale classes?

Let's just suppose there is a club the runs about a dozen 12th scale cars, some are moving over to 1S while the others are left behind due the economy or what ever. I would guess that you could have the 4 cell guys drop a cell and have the new minimum weight be something like 800g for everyone. Sure, there will be some weight balancing to do in the chassis, but could it work? Will chargers correctly peak off 3 cells? The idea is.... a 4 cell guy would have just a few more race packs. And when the time comes, the switch over to 1S wouldn't be drastically different to the equipment once the budget allows it.
I think the Minot group are doing something very much along those lines, though I have yet to see the details like weights or anything.

Here we just didn't have time to test so we ended up splitting the class. Not NECESSARILY a bad thing as it looks like the "shoes" (such as we are) will move into the 1s / 13.5 SuperStock class which should give everyone else a shot at the glory in the 1/12 Stock (4-cell / 17.5 or 27T). That was the theory anyway, last year's champ (the elder Poulson brother) will run both. I think we should make him run 1s / 17.5 in it. Heck, maybe I will too since it's looking like my only chance to run 1s Stock will be in Minot.
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Old 10-09-2009, 11:14 PM   #32392
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Here we just didn't have time to test so we ended up splitting the class. Not NECESSARILY a bad thing as it looks like the "shoes" (such as we are) will move into the 1s / 13.5 SuperStock class which should give everyone else a shot at the glory in the 1/12 Stock (4-cell / 17.5 or 27T). That was the theory anyway, last year's champ (the elder Poulson brother) will run both. I think we should make him run 1s / 17.5 in it. Heck, maybe I will too since it's looking like my only chance to run 1s Stock will be in Minot.
Scottrik,

Don't forget about trying your 1s 17.5 stock when you come up to Great Falls for the inagural Montana State 1/12th Team Shootout Series!

We've got 9 or 10 guys for race nights with 5 switching over to Lipo/17.5. We're on a small track for most of you (26x54) and still figuring the Rollout for the Lipo's, getting pretty close. We run everybody together and it's been great so far. The competition is closer than ever and it's really anybodys game now to be in the top 4 for the A-main. We haven't compensated any weight and our whole group has ended up performing in a tighter pack. We've had more fun in the last couple of weeks with close racing than we've had in a long time. Adrenaline man, it's a good thing.

I can see on a large layout, things might not match up. Smaller, tighter layouts don't look to be an issue. Maybe it's good for the fastest guys to have to race with somebody instead of running away from them? Those Poulsen's are to fast anyway, aren't they?

Aaron
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Old 10-09-2009, 11:27 PM   #32393
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Those Poulsen's are to fast anyway, aren't they?
We'll sell 'em to you cheap...

Aaron, give me a call when you get a minute.

Thanks,

Scottrik
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Old 10-10-2009, 01:10 AM   #32394
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So I finally got to run my 1/12 scale tonight.

I was running full size Jaco's as my lathe hasn't shown up and a 73 spur with a 53 pinion, Tekin RS Pro and an Orca 17.5. That gave me a rollout close to 111mm. I had plenty on the straight and didn't give up alot in the corners, but I did give up some. I was actually keeping up to a guy running 13.5 on the straight. I did try a 50t pinion but prefered the feel of the 53t. It made me be smoother on the throttle.

I did have one problem though. I am running the Novak smart boost and a couple of times I lost power to the receiver so it would go full throttle through the corner, generally straight into the boards. I have a 4 channel receiver and the thing is full with the ESC, servo, transponder and the Smart Boost. What can I do to help eliminate this? I know I could try a receiver pack but I just spent the money on the booster.
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Old 10-10-2009, 05:16 AM   #32395
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I was running full size Jaco's as my lathe hasn't shown up and a 73 spur with a 53 pinion, Tekin RS Pro and an Orca 17.5. That gave me a rollout close to 111mm. I had plenty on the straight and didn't give up alot in the corners, but I did give up some. I was actually keeping up to a guy running 13.5 on the straight. I did try a 50t pinion but prefered the feel of the 53t. It made me be smoother on the throttle.

I did have one problem though. I am running the Novak smart boost and a couple of times I lost power to the receiver so it would go full throttle through the corner, generally straight into the boards. I have a 4 channel receiver and the thing is full with the ESC, servo, transponder and the Smart Boost. What can I do to help eliminate this? I know I could try a receiver pack but I just spent the money on the booster.
Install a capacitor. The easiest method would be to pick up one of the Spektrum caps and plug it into the receiver (may require changing the plug or even doubling-up with the Smart-Boost plug?) and Futaba themselves may very well have a similar product. They run $5-6 at Stormers ready-to-install. Or pick up capacitor (the Spektrum one should work here as well, or Novak, or...) and install it in input lead for the Smart Boost.

What is happening is that you're pulling some BIG gearing and on hard acceleration you're pulling the battery voltage down. I'm kinda surprised you aren't getting too much heat into the motor or esc. Something I've found with the BL motors/esc's is that I can gear up and up (minding my temps!!) until the lap times begin to level out or fall off but some time before I've gotten there the car pulls noticeably less hard off the corners. You are able to compensate by making your corners more and more sweeping. While this MAY get peak lap times when you're on your own on the track you'll find this to be counter-productive in race situations as when you sweep your turns like this you're extending a HUGE invitation (which WILL be accepted) for your competitors who are accelerating harder off the turns to push it up the inside and pass you. Yeah, higher top-end speed "feels good" but you give up a little of that to keep more acceleration and tighter lines in the infield. Just how much you "give to get" is a compromise you have to get a feel for but for me it seems to be 5-10mm (maybe closer to 10mm) below where I get my peak lap time.

The neat thing is that backing of your gearing a bit may very well "kill" your voltage drop problem. Regardless, make sure you temp your motor and esc--I've not heard of anybody running gearing quite THAT high. I've not run any 1s / 17.5 (only 13.5 and 10.5) but my understanding is folks are running 95-105mm depending on how "tight" their track is and what their own personal trade-off factor is.
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Old 10-10-2009, 06:45 AM   #32396
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I saw the mention of running 3 cell NiMh/19 turn in order to have a little parity with LiPo/10.5. My question is: would this be feasible running brushed or is the efficiency not there to make it the full 8 minutes? Would I be better off running a LiPo RX pack with a regulator or an old school 5 cell NiMh RX pack (ESC's are Novak GTS and KO VFS-1)? I will be making the switch to 1s LiPo and brushless when funds allow and when I've burned through the stock of brushed motors and brushes that I have. I also wouldn't mind getting a little more use out of that ancient lathe of mine....

Thanks in advance for any advice!!!!
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Old 10-10-2009, 07:13 AM   #32397
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We run 3 cell nimmh/ or single cell lipo with the min wt of 730 also. A bit f work but you can get close to wt. Lipo car and 3 cell car are nuts on for lap times tire wear an speed they do different things for drop off through the run.

This is 12th stock on our small track 17.5 3.7v. Yellow and white car is lipo and red with white nose is 3 cell nimmh. Both of these drivers normally are racing nose to tail.

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


and here is the race data so you can see lap times etc.

http://jlapracemanager.com/PC/Molzer...ed%20Night.HTM
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Old 10-11-2009, 03:31 PM   #32398
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Default LRP QC3 with LiPO 1S?

Has anyone tried to run a 1S LiPO with a LRP QC3 ESC? Its LiPO rated but it appears this is for 2S.

Thanks, Lee B.
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Old 10-11-2009, 07:59 PM   #32399
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Has anyone tried to run a 1S LiPO with a LRP QC3 ESC? Its LiPO rated but it appears this is for 2S.

Thanks, Lee B.
It is rated for 2S, but you could run a Novak booster which has a 1S cut off feature that should keep you safe. Many are turning the esc lipo safety cut off "off" any way.
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Old 10-11-2009, 10:52 PM   #32400
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Default Brushless motor in Switchblade

Does anyone know if a brushless motor will fit in a Switchblade SE?
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