2-speed transmission

[SlowestMicro]

this has been probly posted back in the old fourm but this would be ausome if there was a 2speed now how fast would it go now with a orion corless

[TGRupert]

In my opinion it would probably take a lot of room, but would be nice if they could make it.

[SlowestMicro]

actuly your right im thinking it might off balence the tires since the spur gear is attached to the axle


but hay u never know maybe a there will be a micro with a transmission or something builtin2speed like a t-maxx


&edit&

but not as big of course =)

[TGRupert]

you mean like this (http://www.wildhobbies.com/news/default.asp?cmd=view&articleid=557)

[SlowestMicro]

yeah i wish lol a 1/20 scale tmaxx to bad its a foolsjoke:mad:

[TGRupert]

all my inside sources at Traxxas tell me it is more than a joke. of coarse I have no inside sources at Traxxas, but if I did and they all said that it woulde be HELLA COOL:cool:

[Mykroe]

yeah rupert wasn't there somthing in RCCA about it? LOL jk

[SlowestMicro]

yeah :D

[ricerocketinwa]

I think the 2 speed tranny is a big waste of time on an electric unless you have a hell of allot of long straight aways on the course you run. I had a HPI RS4 that I ran one on, and I did better times without it. (We Had maybe one long straight away per course we ran.

[TGRupert]

I though of a way one could do it. You would use two motors, one in front of the dif and one behind it. Once the first motor (8-13 teeth) gets the car to a preset speed the power is switched to the rear motor which uses a taller pinion (13-20). If the second motor's speed goes down to a certain point the first motor would get the power. The problem is when the first motor is going it also has to turn the second. To remedy this the power from the second motor could be sent back into the first. Unfortunatly even with a very efficaint motor power would be lost. posibly some sort of one way diff could be used to prevent one motor making the other spin.

you might set it like this:
use motor one until speed is over 16mph
use motor two until speed is under 13mph

This all could be controled by a simple PIC chip and some relays. I think the electrical engeners on the forum could do better than me at figuring it out. with a few simple aditions the system could have a memory of your top speed and even connect to a computer or PDA via IR to give you graphs of what was going on inside the car.

[Shadowrat]

or, you could just buy a brushless motor and controller and save yourself alot of time and money.

[Mykroe]

Heheh thats true but a good brushless system cost about 3x what our car does!

[ricerocketinwa]

I don't see the big stink about brushless, yeah it's a better system, but it will never be that big, because it won't be ROAR legal. If they do make a class, then it will be all the pros and thats it. They are the only ones who can afford a new engine every race day.

[TGRupert]

well it's a good thing roar isn't in charge of micro races right? also I can garentee the price will go down and the technology will improve.

[MicroDude]

MOTOR, ricerocketinwa. MOTOR :D

[jw_j]

how about this Rupert two motors, but the screw that holds the motor secure and keeps it from moving could be left out, the torque from the motor would kick it into the spur gear allowing it to move, then the power could be switched to the second at a preset speed sending it into the spur kicking the other away you would possibly have to have a special radio system and two batteries/escs/and receivers

[Woody]

That micro project is bad ass-ity.....

[ricerocketinwa]

Oh and by the way, since we are trying to get the car to go faster, lets add about 30LBS to it.......Let's think people. It takes a hell of allot of HP in real cars for each little bit of weight you put on to make it go faster. I say they would have to come up with a system like that of the 1/10th scale RS4. 2 motors, and all will add so much weight that the ends will not be faster....hence a big waste of money. Its the laws of Physics people!

[TGRupert]

micro motors are very light, it's not like we're adding an additional engine to a car.

[ricerocketinwa]

Yeah I see what your saying. I was just commenting on the guy that said you would need 2 ESC's and so on. I wonder how fast a Micro would go with dual 300's in it. A Explorer II ESC should be able to handle 2 300's in Parallel shouldn't it? Just a thought!

[TGRupert]

(whispering) if you mount it it will work

[hogpower]

i would love to see a 2 speed tranny. to see a micro doing 40 to 60 would be awsome. i'm not sure how it would work but it would definately be cool.

[ricerocketinwa]

I was talking today with a friend of mine I met off this website. We were talking about how you could mount a 1/10th car engine in a Micro. Put it in center and have it run off 2 belts. Kind of like gas cars do. That would be a fast mother. Put a 9T in there and let her rip.

[elementuu]

i think you would rip the chassi in half