Retro R/C questions

[Dutch Guy]

Now that my son is almost 8 I decided to take my old R/C cars out of storage but I have some questions as I forgot most of it.

They are a 1:10 Tamiya Thundershot and a Thunder Dragon, I think they are >20 years old now

I had an old 1700mAh NiCD 7,2V battery but the buggy only runs 2 minutes on that so I ordered a 3000mAh NiMH 7,2V battery, can I use the same charger with that battery and how can I calculate the charge time?

I can see I bought a replacement motor but I can't remember the difference to the stock 540 motor, it says Kyosho Mega Motor 14x2 Dirt Oval on it but how does it compare to a stock 540 motor in speed/running time etc?

I have an old 27Mhz remote, can I buy a new 1:10 buggy (if they fail to work)and still use the old remote by inserting the Mhz 'thingy' in the buggy or do I need to buy a newer compatible remote with a new buggy?

 

[Dutch Guy]

Can you store electric motors forever or do they degrade when stored?

If I buy a new motor should I go with an engine that has a lot of turns or high RPM?

Is this correct?
Lots of turns = more power and better acceleration
High RPM = higher top speed but worse acceleration

 

[Dutch Guy]

Charge time will vary according to the charge rate.

Rough rule: capacity of battery / charge rate and add 10%
eg with a 300mA charger,
3000 / 300 = 10 hours, add 10% = 11 hours

Thanks for that, I found a (cheap) 1A rapid charger so that would mean I can charge a 3000mA pack in ~3 hours which is acceptable.

There is also a 2A charger but they warn that the charge should not exceed 0.4x the battery, is that true or will it work anyway but warm up the battery?

 

[Dutch Guy]

14x2 sounds like it's a 14 turn double, which is 14 winds of wire round each armature and two lots of wire. Less turns means higher speed and more windings (eg double, triple) means more power and more battery consumption, so no wonder it eats the battery in 2 minutes

I see, so a 14x2 motor is fast and powerful but uses a lot of power

I think I will see if the original 540 motor still works and use that, I am not looking for too much speed now as my son isn't yet good at controlling and going too fast will mean a busted car most likely.

 

[Dutch Guy]

Motors don't like being left for ages. The one in my electric glider had gone strange and wouldn't turn. Just vibrated up and down.
540's are cheap anyway.

Found them for 8 euro, any advice how many turns I should get? (They are from 15 turns to 35 turns)

 

[Dutch Guy]

Tried the car this evening with the new 3000mAh battery and stock motor and it ran great, speed wise it's fine for my son to learn R/C driving, I will try tomorrow with the 14x2 motor and see if the new battery makes a big difference.

My charger works fine with the NiMH battery even though they didn't even exist when I bought it, only problem is that to fast charge I need to use a timer that only goes to 30 minutes so I have to watch before it runs out to go on charging, but it works.

So I will leave it as it is now and not go crazy with upgrades just yet, first I will see if my son can keep the car in one piece, lol

 

[Dutch Guy]

Switched the motor for the 14x2 one and it made a big difference, the car is so fast it's dangerous.

I made a ramp and the car jumped 12 feet in the backyard and landed in the grass and styaed totally stable in the air, lol