Re: Whats this guy up to?

[Admin]

Well b_drift, here’s my theory on your question.

First of all, in the regular car the motors aren’t maxed out. The only take as much current as the need based on voltage. Ohms law is V=IR. R is the resistance or impeadence of the motor windings, V is the voltage applied to the motor and I is the current it will use.If the booster car adds more voltage, do the algebra, the motor takes more current. So, the motor’s aren’t necessarily maxed out, it’s just they won’t take any more amperage based on the voltage they are being given. So, if more voltage is given, more amprage will be drawn and more power made. Now, if too much voltage is applied, then the amperage will increas to where it will get hot and melt the brushes away. (Volts xAmps = Watts) and watts is directly proportional to heat. The more watts, the hotter. That’s right, do the calculation on a light bulb. 100 watt bulb at 110 volts means .9Amps is being drawn (of course it’s AC so a few other rules apply but close enough).A 100 watt headlight that’s 12 volts is 8 Amps.

My cars with upgraded motors did the same thing, soggy. When I put the NiMH battery in they lasted a LOT longer before getting soggy. I’m sure it’s the battery that’s to blame for this. However, running your stock battery down is necessary if you want top performance out of your battery but with NiMH you can regharge at any time without the battery developing a memory.

OK, so, I believe there are three stages of the battery power. Peak, Normal and Soggy. With regular NiCad and 2 charges back to back my 2.2 was aprox. 30seconds peak, 4 minutes regular and (depending on warm or cold) 1-3 minutes soggy. With NiMH and 4 charges back to back my 2.2 was 2minutes peak, 20 minutes regular and 5-8 minutes soggy. Now, I know you’re thinking, so what, longer run time. That’s not what’s so good here. I’ts the Peak Time that kicks butt.

I belive Peak time is simmilar to the boost button. Yes I’m sure the Boost button applies more voltage to the motor but I’m sure it’s within specifications of the motor. I think peak time right after a good charge on a regular bitapplies the same voltage as the boost button on a booster car. Also, the AC charger that I made peaks the battery a little better since it’s .5 volts higher then the remote. The booster cars probably have two transistors for the motor and one of them applies a higher voltage to the motor when the boost is pushed. This should be OK since the boost button is pushed once the car is moving. I’d be willing to bet the motor wouldn’t last as long if the booster cars appliedthe highest voltage at startup.

Have you ever given your bit throttle while on the charger? Have you heard how much faster it sounds? Well, that’s what a well peaked battery will sound like for the first 10% of it’s life if well peaked. I don’t think the remote chargers are very good at peaking the battery.

To prove it I made a jump that my normally charged battery couldn’t quite make it up. I’d give it a good running start and it would just about make it to the top. This was with a battery that was fresh but not at peak. The car ran like this for 20 minutes with the same performance so I knew it was in the normal power range of the battery. Then I put it on my AC charger for 2 minutes so it would get a good peak and tried it on the same jump. It went right over, no problem! It kept going over the jump for 2 minutes untill it went back to normal. Then it wouldn’t make it over for the next 20 minutes. NiCad batteries are the same only they have less capacity meaning all these times are cut in 1/3. Peak is only 45 sec and normal is only 6 minutes (assuming you charge well). Give this test a try. tell me what you think. Make a jump or hill that your car barely makes it over after trivnig your car for at least a minute. Then charge it back to back 3 times and dirve it over the hill right away. I’m sure it will go over! No imagine you had that kind of power for 2 minutes.

I don’t know how much faster a booster is then a bit. I don’t know how much voltage is applied. I don’t have one. Sorry. All I know is my bit (modified with NiMH, Blue gears, bullet motor andgear)is so fast it’s hard to stay in my track that’s only and oval on a 4X8 pool table and it goes over jumps that it usually can’t land because it gets so high and far the car bounces all over when it lands. I’ts too fast to race on a tight corse but great for drag racing.

-Peter