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Old 10-30-2007, 09:28 AM   #1
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Default Longest run time

Hi Expert Buddies,

I am Vic . I wish to buy a new RC electric Car. But, the main issue is run time.

For a RC car that weights about 1600kg, what is the longest run time ?

What battery do you recommend ?

I have a RC monster truck electric with 1800 mah battery.

But, the run time is only about 1 min max. That is terrible. The car weight is 2.3kg.

Compared to my nitro car which can last at least 10 min per tank, this holds me back from playing electric car and keep it on my shelf.
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Old 10-30-2007, 09:40 AM   #2
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...for your electric, you can pick up a 4200 or 4600 pack that would give a LOT more run time w/o having to even change gearing (Probably 4-5 minutes minimum)

You may drop a tooth or two on the pinion gear and get even more run time if that's what you are looking for.

There are some LIPO options for batteries as well, but you'd probably need a NEW charger too (depending on what you already have)
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Old 10-30-2007, 09:56 AM   #3
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Quote:
Originally Posted by SWTour View Post
...for your electric, you can pick up a 4200 or 4600 pack that would give a LOT more run time w/o having to even change gearing (Probably 4-5 minutes minimum)

You may drop a tooth or two on the pinion gear and get even more run time if that's what you are looking for.

There are some LIPO options for batteries as well, but you'd probably need a NEW charger too (depending on what you already have)
If I use lipo, of course I need a new charger but that is not an issue cos I can play longer, why not.

But, can lipo be used on brushed motor ?

Will it cause problems ?
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Old 10-30-2007, 10:04 AM   #4
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I heard that there are batteries that can last for 30 min run time ( maybe for
car weight which is about 1600kg ??), anyone knows ?
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Old 10-30-2007, 11:58 AM   #5
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Lipos can be used just fine w/ brushed motors, they are just batteries.

There are other things that create runtime though too.

What type of motor?
What type of surface?
What kind of gearing?

What are you looking for from your electric vehicle?

GEARING plays a huge part in Run time, but the lower the gearing, the slower the speeds..but the longer the run time.

Too often people want SPEED and give up run time...(and can't actually achieve the SPEED they are looking for, due to surface conditions, or area size) Then end up over gearing and getting things too hot...and KILL their run time.

If you were to use something like a 5000 mah LIPO, you should have LOTS of run time. With 2 packs you could have quite a bit of run time and fun between charges.

NOTE: Brushless Motors ARE more efficient, and can when geared properly give you even more run time.

(as far as a battery that lasts 30 minutes - there are just TOO many factors involved to say if YOU could get 30 minutes out of ANY battery... things from Gearing, and gear efficiency, speed, surface, style of driving, type of surface...etc.) MOST New style batteryes (MATCHED Sub "C's") are tested at 35 amps, and run for over 400 seconds...if you gear to only use roughly 15-20 amps vs. the 35 amps tested...you'd get over 15 minutes run time. If using a STOCK 27t motor, this can be achieved. If you use a 19t or MODIFIED MOTOR - you will NOT be able t get that kind of run time in most cases.
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Old 10-31-2007, 03:35 AM   #6
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Thanks for your info.

Suppose I buy Kyosho ZX-5 RTR,

What is the longest run time ?

What battery to use to achieve that ?

Thanks.

Regards,
Vic
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