Mamba Max 7700Kv

Old 08-01-2009, 06:06 PM
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when you go to a higher cell count (ie- higher voltage) but keep the KV the same, you are going to have a much faster vehicle with the same gearing.

Guys go with more voltage and a LOWER KV motor which is more efficient and runs cooler. You will also benefit from more runtime do to the efficiency. In general though, you will be going for the same speed as a lower voltage higher KV setup.

There is a calculator out there that will tell you estimated speeds based on gearing, voltage, and motor Kv. I'd post it but I don't have the link right now.

Anyway, in general for racing you would start your gearing between 35 to 40 mph. I usually do this, and then gear my car to top out towards the end of the longest straight. this has worked quite well for me. Then, if I feel its not enough or too much, I gear accordingly.

For your usage, I would say right now start with a 4S battery pack and the MMM 2200Kv motor combo, or, if you don't mind spending more, can also do a Tekin system. The MMM 2200Kv motor is quite rebust, and on 4S works excellent. It can handle 6S, but personally and others would agree, its all show. The real benefit of the electric setup is the instantaneous power it makes, other than the obvious less maintenance.
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Old 08-01-2009, 06:10 PM
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Originally Posted by Cain View Post
when you go to a higher cell count (ie- higher voltage) but keep the KV the same, you are going to have a much faster vehicle with the same gearing.

Guys go with more voltage and a LOWER KV motor which is more efficient and runs cooler. You will also benefit from more runtime do to the efficiency. In general though, you will be going for the same speed as a lower voltage higher KV setup.

There is a calculator out there that will tell you estimated speeds based on gearing, voltage, and motor Kv. I'd post it but I don't have the link right now.

Anyway, in general for racing you would start your gearing between 35 to 40 mph. I usually do this, and then gear my car to top out towards the end of the longest straight. this has worked quite well for me. Then, if I feel its not enough or too much, I gear accordingly.

For your usage, I would say right now start with a 4S battery pack and the MMM 2200Kv motor combo, or, if you don't mind spending more, can also do a Tekin system. The MMM 2200Kv motor is quite rebust, and on 4S works excellent. It can handle 6S, but personally and others would agree, its all show. The real benefit of the electric setup is the instantaneous power it makes, other than the obvious less maintenance.

Again im just mainly a basher, looking for long run times, and fastest possible cars
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Old 08-01-2009, 07:30 PM
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RPM, gearing and wheel diameter determine speed. Motor kv and batt voltage determine RPM, a range really. These motors have rotors and bearings and are rated to certain rpm. You exceed rated rpm for long and the motor will fail. The rotors inside the motor can start coming apart when pushed above their limits and brgs can fail. Serious overheating demagnetizes the magnets in the motors and that can fry the electronics and batts.

You're going to find there is a practical limit to speed for an rc. Once close to that limit, theres a prob with staying on the ground - hit a pebble and its airborne. You also need lots and lots of open, clean road cause they are harder and harder to control as speed increase.
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Old 08-01-2009, 07:43 PM
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If you really want it to go as fast as possible then get the MMM2200, a 6s high mah Lipo, and a good selection of pinion gears. If you gear it properly the Motor/ESC will hold up just fine. But be prepared to spend money on upgrading your drivetrain and broken parts. This will be pretty much useless on a track, but lots of fun blasting up and down a wide and empty street.
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Old 08-01-2009, 07:54 PM
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I mean is it REALLY that hard to control?
I guess im just to use to nitro, being able to hold it all the way.
But wouldnt the 6s lipo have more run time than the 4s or 5s?
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Old 08-01-2009, 08:46 PM
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Yes, it is that much harder to control - most use a higher end radio and dial out as much strg sensitivity (strg expo) as they can to help and that does help. With a ordinary radio, it's much harder. I have a 18th scale that will do 45+ and its very hard to keep planted and to control. The control issue is not as big a deal if you're in a huge parking lot, but in front of the house, its a big deal. Trying to stay on the road, avoid gutters, parked cars and traffic, its an issue at those kinds of speed.

2S, 3S, 6S etc is only voltage - voltage has little to do with run time, thats capacity (mah), how big the batt is, 3800, 4900, 5200mah etc.
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Old 08-01-2009, 09:15 PM
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For the buggy, you would have good speed with 2200 and 4S thru 6S. Depends on how you gear it. I suspect you will have to determine what kind of money you have to spend and what level of control vs. speed you want. You'd be "better" off with 6S LiPo and 1900KV motor of some type. 2200 is fine - 6S with a 10T or 11T pinion may work for you but it will be crazy fast. It will have more runtime than 5S - but I suspect there is a chance of you putting the car through a wall or something (ie. lower runtime).

The 2650 is mighty fast - I use it in a Hyper 9.5 with a 3S battery which is 11.1 volt, and it's more than enough for racing (control and speed). That motor is limited to 4S battery due to overall RPM rate at 4S.

Bash and have fun. Go for the 2200 and 5S or 6S battery. You'll be smiling and maybe breaking a part here or there but loving it the whole time. Start with 11T pinion though - not much bigger for that setup unless you have good air-flow for cooling and can keep your motor from overheating if you do some heated bashing sessions and speed-runs.
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Old 08-01-2009, 09:29 PM
  #23  
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Originally Posted by jmcvicker View Post
For the buggy, you would have good speed with 2200 and 4S thru 6S. Depends on how you gear it. I suspect you will have to determine what kind of money you have to spend and what level of control vs. speed you want. You'd be "better" off with 6S LiPo and 1900KV motor of some type. 2200 is fine - 6S with a 10T or 11T pinion may work for you but it will be crazy fast. It will have more runtime than 5S - but I suspect there is a chance of you putting the car through a wall or something (ie. lower runtime).

The 2650 is mighty fast - I use it in a Hyper 9.5 with a 3S battery which is 11.1 volt, and it's more than enough for racing (control and speed). That motor is limited to 4S battery due to overall RPM rate at 4S.

Bash and have fun. Go for the 2200 and 5S or 6S battery. You'll be smiling and maybe breaking a part here or there but loving it the whole time. Start with 11T pinion though - not much bigger for that setup unless you have good air-flow for cooling and can keep your motor from overheating if you do some heated bashing sessions and speed-runs.
How much run time will i get out of a 3000mAh lipo battery and a 2200kv motor
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Old 08-01-2009, 09:30 PM
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What is another fast motor that is a 2200kv besides the MMM
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Old 08-02-2009, 05:02 AM
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here are a few
http://www.amainhobbies.com/product_...s-Motor-2250kV
http://www.amainhobbies.com/product_...tor-85T-2100kV
http://www.amainhobbies.com/product_...s-Motor-2100Kv
http://www.amainhobbies.com/product_...s-Motor-2100Kv
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Old 08-02-2009, 05:09 AM
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Originally Posted by davidg01234 View Post
How much run time will i get out of a 3000mAh lipo battery and a 2200kv motor
I don't think you want to use a 3000mAh with an 1/8 scale. 5000mAh or bigger is where you want to be. The point is - the "C" rating (amp draw) on the smaller 3000mAh lipo will be lower than 5000mAh or larger. It would be like putting a 4-cylinder gas engine into a Ford F-250 truck.

Do you have any budget issues or are you looking for the best possible setup you can get? If you do have budget issues - hobbycity.com has low-priced stuff including batteries, motors and ESCs. You probably wouldn't like their motors, though - they're low-efficiency (hot fast, rather than the better more efficient Castle or other motors).

Medusa V2 Afterburner is another choice vs. the ones listed above. The 3680 2200kv is under $100.
You may get confused by the table of motors on this page, but you could choose from one of the 36x60 x70 or x80 motors. You'll notice as they get longer, they are higher wattage (power) rating. The 3680 2200 motor would be similar to the Mamba 2200 but may even have a higher power rating (watts). With higher power you can gear it a little higher for more speed. You do need good batteries to drive it though. 5000mAh 30C type batteries - 4S1P or 5S1P would work out there pretty well for a strong motor/battery setup for what you're after - 12T pinion (probably).

http://www.medusaproducts.com/motors/036-V2.htm
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Old 08-02-2009, 09:29 AM
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MM= mamba max 4600kv,5700kv,6900kv,7700kv used for 1/10 vehicles
MMM= mamba monster 2200kv,2050kv, used for 1/8 scale
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Old 08-02-2009, 09:39 AM
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yes i just realized that.

So will any 2200kv motor go just as fast as any other 2200kv motor with the same battery
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Old 08-02-2009, 10:41 AM
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2200 KV is the unloaded spin rate per volt. Some motors have different wattage ratings. If a motor has a higher wattage rating - you can "gear it up" and go faster. Speed is effectively horsepower delivered to the road. Wattage is a unit of work - same as horsepower. So, higher wattage - able to drive a higher gear = faster.

A 2200KV motor that is rated 1000W and a 1100W motor - the 1100W (watts) will be more powerful. Those are usually the longer motors (ie. Medusa 3680 vs. a 3670 - 80mm is longer than 70mm).

To deliver that wattage, you need volts x amps. You must be able to deliver the motor's wattage rating based on batteries hooked up. If you use a 4S lipo, that is 14.8 volts. 1100W motor. Divide 1100 / 14.8v = 74Amps. If you have a 4S1P 14.8v 5000mAh battery rated at 20C continuous, that can deliver up to 100 Amps. That would work. But if your motor is rated 1800Watts - that needs 121 Amps (or a higher Cell-count battery like 6S1P).
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Old 08-02-2009, 10:51 AM
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Originally Posted by jmcvicker View Post
2200 KV is the unloaded spin rate per volt. Some motors have different wattage ratings. If a motor has a higher wattage rating - you can "gear it up" and go faster. Speed is effectively horsepower delivered to the road. Wattage is a unit of work - same as horsepower. So, higher wattage - able to drive a higher gear = faster.

A 2200KV motor that is rated 1000W and a 1100W motor - the 1100W (watts) will be more powerful. Those are usually the longer motors (ie. Medusa 3680 vs. a 3670 - 80mm is longer than 70mm).

To deliver that wattage, you need volts x amps. You must be able to deliver the motor's wattage rating based on batteries hooked up. If you use a 4S lipo, that is 14.8 volts. 1100W motor. Divide 1100 / 14.8v = 74Amps. If you have a 4S1P 14.8v 5000mAh battery rated at 20C continuous, that can deliver up to 100 Amps. That would work. But if your motor is rated 1800Watts - that needs 121 Amps (or a higher Cell-count battery like 6S1P).

I dont really know what your talking about

but will this battery work for the Mamba monster 2200kv
http://www.hobbycity.com/hobbycity/s...idProduct=8588
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