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Power to mass ratio
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Hey you guys.

I have a problem. I would like to order some PF parts (have none at the moment) and would appriciate a little help from an experienced builder.

Lets say that I'm planning to build a vehicle. Probably between 3000/4000 blocks. 81,6x34ZR wheels. Containing at least one battery box, 4 medium motors. The question is:

Do I have to get an XL motor for the drivetrain, or will an M motor manage to move such a heavy creation?

Of course I know this depends also on the engine to axle ratio, but you know, generally speaking.

Thanks in advance for all your answers.
Permalink
| May 18, 2010, 11:05 am
I am hopefully getting Super Street Sensation, which has those wheels, quite soon and I have been planning on the creations I will try to build with those awesome wheels. I have thought of building some older sports car with rear live axle setup. My thought was to power up the rear axle with XL motor and a automatic gearbox. I have planned to use XL purely because I can be sure that it has power to move the whole car with 1:1 ratio. Medium motor would have to be geared a lot in order to get the same power as XL and I am not really sure that Med' has to power inside..

So, in your case, I would use XL just to be sure.
Permalink
| May 19, 2010, 10:22 am
Hmm. My plan is to plant the PF motor in the engine. The thing is, that the XL one won't fit in the one that I've designed.

The power was supposed to go from the motor to the gearbox, and than to the front and rear axle (4WD). In that case there is of course no problem to create a ratio that will move the car, although I obviously don't want it to move like an inch/hour...

Since I was feeling the M motor won't manage I decided to redesign the engine. It's not capable of fitting two M motors. I think this will be enough.

So here's the thing now. In order for the mechanism to work properly I need both engines to work at the touch of the same button. I guess that isn't a problem. More complicated thing is that one of them has to work in an opposite direction to another (one clockwise, the other counterclockwise).

Is it possible?

I've got a feeling that's a silly question, but excuse my noobishness :) I didn't have any PF parts in my hand ever.

I'm also posting the photo of the project below:

[URL=http://img708.imageshack.us/i/37051458.png/][IMG]http://img708.imageshack.us/img708/3323/37051458.th.png[/IMG][/URL]
Permalink
| May 19, 2010, 10:53 am
 Group admin 
Quoting Piotr Pilarski
Hey you guys.

I have a problem. I would like to order some PF parts (have none at the moment) and would appriciate a little help from an experienced builder.

Lets say that I'm planning to build a vehicle. Probably between 3000/4000 blocks. 81,6x34ZR wheels. Containing at least one battery box, 4 medium motors. The question is:

Do I have to get an XL motor for the drivetrain, or will an M motor manage to move such a heavy creation?

Of course I know this depends also on the engine to axle ratio, but you know, generally speaking.

Thanks in advance for all your answers.

you will need an XL motor, If I was building something that large I would use two XL motors for the drive train
Permalink
| May 19, 2010, 11:37 am
 Group admin 
Quoting Piotr Pilarski
Hmm. My plan is to plant the PF motor in the engine. The thing is, that the XL one won't fit in the one that I've designed.

The power was supposed to go from the motor to the gearbox, and than to the front and rear axle (4WD). In that case there is of course no problem to create a ratio that will move the car, although I obviously don't want it to move like an inch/hour...

Since I was feeling the M motor won't manage I decided to redesign the engine. It's not capable of fitting two M motors. I think this will be enough.

So here's the thing now. In order for the mechanism to work properly I need both engines to work at the touch of the same button. I guess that isn't a problem. More complicated thing is that one of them has to work in an opposite direction to another (one clockwise, the other counterclockwise).

Is it possible?

I've got a feeling that's a silly question, but excuse my noobishness :) I didn't have any PF parts in my hand ever.

I'm also posting the photo of the project below:

[URL=http://img708.imageshack.us/i/37051458.png/][IMG]http://img708.imageshack.us/img708/3323/37051458.th.png[/IMG][/URL]

here is what I would do, use an XL motor but hide it. Also, with all those gears you could run into problems with them slipping under heavy load when the car is moving. what I did with my Audi R8 is exactly that. I hid the drive motor but connected it to the engine's crankshaft. This gives the effect of a "working engine." But if you must use your original design, all you would need to do is connect one motor to the battery box (or IR receiver) then on top of that motor (or the other free spot on the IR receiver) connect a switch, then connect the second motor to the switch. The switch will allow you to controll the direction of the motor attached to it.
Permalink
| May 19, 2010, 11:49 am
Thanks for the tip on the switch :)

Regarding the main topic. Two XL motors? Darn that's a lot of power...

I remember reading somewhere that a single battery box can, at once power up to 2 XL or 4 M motors.

If this is true than using 2 XLs for the drivetrain itself would mean that the car wouldn't be able to turn at the same time? Or it'll at least slow down right?
Permalink
| May 19, 2010, 1:33 pm
 Group admin 
Quoting Piotr Pilarski
Thanks for the tip on the switch :)

Regarding the main topic. Two XL motors? Darn that's a lot of power...

I remember reading somewhere that a single battery box can, at once power up to 2 XL or 4 M motors.

If this is true than using 2 XLs for the drivetrain itself would mean that the car wouldn't be able to turn at the same time? Or it'll at least slow down right?

yea it would slow down. I forgot about that.
Permalink
| May 19, 2010, 7:51 pm
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