World's Fastest R/C Car, anyone?

[santosh]

Dual Engine that reminds me of the Jep hurrican 2 hemi engines. But back on topic. Who won the competition this year/got the fastest car?

[team222badbrad]

I have not seen the Jato on the track, but I have looked at the truck before it was released at a hobby show. It looks pretty cool, but I am not sure this would be the best vehicle to mod for speed.

How about going for a bigger engine rather than running 2 engines?

The only vehicles I have seen with twin engines are monster trucks such as the Giga Crusher.

http://www2.towerhobbies.com/cgi-bin...&I=LXHJB2&P=ML

My Losi LST has a .26 engine weighs 13 pounds and goes about 39 MPH.

I am sure you could get the 5 pound Jato to go much faster with a bigger engine, the only downside is that you would have to greatly mod the transmission, if not build your own.

Find the most powerful engine with the highest RPM.

The other problem with the Jato is that there is not much room for a bigger engine as far as I can see, I could be wrong here.

The truck seems pretty balanced also, however, the engine is mounted to the left side of the truck.

[mechanicalbrain]

the fastest rc i believe was a corvette (the car not a model) running on remote control!

[Jeff K.]

I was reading this older issue of Extreme RC Cars and in the "Racers' Rides" Section, which was the cars of the subscribers. One guy had built a 1/8 on-road car that started as an Inferno 7.5 using a mill, lathe, and CNC machines. It has a Hacker C50 Maxx motor and 12 cells powering it. It also has a custom 3-speed gearbox and has been radared at 92 mph.

Maybe instead of nitro, howabout dual brushless?

[sanddrag]

Originally Posted by Stonefan5271138

Maybe instead of nitro, howabout dual brushless?

Great idea, but may I suggest tripple brushless?

[Jeff K.]

Originally Posted by sanddrag

Great idea, but may I suggest tripple brushless?

LOL OOH Shweeeet

Geared way up at like, almost 2:1...but it would have little to no torque and would take a long track to reach top speed...Or am I wrong? I don't know much about brushless, but I have a 10 turn motor on my Team Associated TC4 with a gear ratio of about 5:1...I may be wrong but it takes just 15 feet to reach top speed.

I'm thinking about maybe going brushless soon, does anyone have like, any reasons why I maybe shouldn't?

[sanddrag]

Originally Posted by Stonefan5271138

I'm thinking about maybe going brushless soon, does anyone have like, any reasons why I maybe shouldn't?

Cost! They aren't cheap. But they sure are smooth and reliable.

[Kyle Love]

Don't they have racing ones that go around 120-150?

[sanddrag]

Originally Posted by Kyle45

Don't they have racing ones that go around 120-150?

Maybe scale mph but certainly not real mph. The fastest so far is Cliff Lett's 114 mph run. The fastest out of the box is a claimed 80 mph which is this car http://www.racing-cars.com/usa/produ...?recnumber=292

[mechanicalbrain]

i guess my remote controlled corvette doesnt count? i seriously wish i had video.

[Jeff K.]

Originally Posted by sanddrag

Maybe scale mph but certainly not real mph. The fastest so far is Cliff Lett's 114 mph run. The fastest out of the box is a claimed 80 mph which is this car http://www.racing-cars.com/usa/produ...?recnumber=292

I was reading it. It's not 80 mph "out of the box."

For Top Speed it says:

Originally Posted by Website

Top Speed: 80 mph (With optional gearing U2567)

So well...technically it's not 80 mph right out of the box, but it can reach 80 mph and possibly even more if you play around with the gearing. But Schumacher makes great onroad touring cars.

[ShaneP]

Wow, I didn't realize that so many of you guys/gals had RC cars. They are truly wonderful machines, that can carry the same technologies as the full-sized scale racing cars.

I subscribe to RC Car Action and RC Nitro. Both are great mags. However, I haven't heard too much about the speed contest latly. Last I knew it was delayed until after June and hadn't heard too much about it after that.

I did have a few ideas for breaking the speed record, but didn't have the resources to make them come true. Of coarse there is always the route of taking and boat load of batteries and hooking them up to a low turn brushless motor. I would say Lithium polymer batteries would best suite this application. But, it would be rather interesting to see a nitro break the record.

Have any of you seen a tether car in action? They are capable of reaching speeds of over 200 mph. That is realtime speed, not scale. In other words just as fast as some of the fastest full size cars on the road these days. the catch is that they need a "push start" to get going, but once they do they rocket up to 200mph in not much time.

Here is a vid of them in action(scroll down almost to the bottem of the page):
http://www.radiocontrolzone.com/cars/video.asp

If you were to take either a brushless motor or a nitro engine to get a tether car configuration up to speed, that would take place of the human "push start." You would need the primary drive system to get the tether configuration up to about 80mph before it could take off on its own. 80mph is how fast the "push start" gets the tether car going to before it is on its own.

Hopefully the weight of the tether configuration in the car wouldn't weigh it down so much that the primary drivie system couldn't get up to speed(80 mph). It sounds logical, but this would call for a great R & D in aerodynamics and chassis distrabution to accomplish this. Anyone confused?

I have always been interested in this hobby, and because of it I had already had a good resource of info about robotics. I say this to encourage people to look into this hobby. It is not only to have fun, but 3/4 of the time you find yourself working on them, matinenceing them, or learning about them, rather than running them. It definately is a worth-while experience.

[Mr.G]

Lithium polymer batteries are great. They have twice the power per weight of other batteries, but they cann't supply the high currents needed for that type of sprint race. They are best suited for endurance type racing.

[MikeJ675]

With the requirements, there's a lot of possibilities...

40" length is a lot to work with.

Some of the motors commonly used in robot combat could be 'interesting' if used properly.

S28-150 Magmotor

This is a smaller, lighter version of the popular S28-400. Same diameter and powerful magnets, just in a shorter, lighter package! And would you believe a whopping 3 horsepower from a 3.8lb motor?

3" Diameter, 4" long
1/2" diameter shaft with 1/8" keyway, 1.75" long
24V (can be run higher)
3 horsepower
1970 oz-in Torque
Max current 285 Amps
82% Efficiency
6000 rpm
3.8 lbs
Neodymium magnets

There have got to be fun ways to use one or two of these...

For the truly insane-
ETEK motor by Briggs & Stratton

This is one of the most powerful DC motors available. There is nothing like it out there. Many of the most powerful spinner robots out there have been using this motor with great success (including Nightmare, Son of Whyachi, Moebius and many more). WARNING: this motor is NOT an ordinary motor, and should be handled with GREAT care. It is very capable of serious power and should always be completely secured before applying any power to it.

24V to 48V (has been run up to 72V)
72rpm per volt (3456rpm @ 48V)
20.8 pounds
7.91" diameter
5.64" length
7/8" shaft with 3/16" keyway and 3/8-16 Tapped center
Torque constant: 1.14 in-lb/Amp (0.13 Nm/Amp)
Max motor current: 330A for 2 minutes

could you imagine the power of this thing at 72v?(estimated 15hp at 48v)


Assuming a new supply is found, the AME D-pack motor is amazing in power to weight and cost to weight(the only downfall being the HUGE stall current)

12v stats(they will run at 24v)
Angular-velocity constant: 592 rpm/V
Peak power: 4.78 hp
Stall current: 1240 A
Stall torque: 2770 ozf·in

with any of these, though, the problem is getting the power to the ground. High traction tires and some creative gearing solutions could easily provide the means of getting to the speed you want.

[sanddrag]

Even direct driving a large 6" wheel on the Magmotor wouldn't get you into the recordbooks. You'd have to actually gear it up.