17 replies to this topic

[Bags]

Got some stuff to share. Remember this is all R&D guys!

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[Bags]

Couple more.

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[Bags]

Hot laps.....the motor stayed at 65-75* These times are the last on the slip.

31 feet long....3 1/2 feet longer than an 1/8 mile.

Power was at 14vdc The brushless motor usually runs on 12vdc. I didn’t push it to 16.2 yet 

but I think it will not end well.......I’m going to change the gears again to see what it will do

on the 14vdc.

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[Alchemist]

Hi Tom!

 

That is one gorgeous looking car!

 

Very very nice!

 

What gear ratio are you employing please?

 

Thanks for sharing.

 

Ernie

[Bags]

This is the Brushless outrunner motor in the car. It weighs 7.5 grams 5500kv 

1.012 x .300 wide trued Protrack Barracuda rubber out of the tube.
Geared 15 x 48  64 pitch on a 3/32 axle w/ ball bearings. 60 grams rtr.

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[hiline2]

that is an interesting motor !!

[MSwiss]

The 60 ft. times are really slow for a 60G funny car.

Dave Crevie, on my track, has run something like .086, with a funny car, using a $16 Hawk 11.

The ET'S are a bit better, but slow.

The mph seems good but I don't run on a 1/8 mile(27 1/2 ft), to get a great feel what cars would do on a 31 ft. track.

Your timing system must show reaction times different than Trackmate.

Is .500 a perfect light, vs .000 or .0000, on a Trackmate?

[Bags]

The 60 ft. times are really slow for a 60G funny car.

Dave Crevie, on my track, has run something like .086, with a funny car, using a $16 Hawk 11.

The ET'S are a bit better, but slow.

The mph seems good but I don't run on a 1/8 mile(27 1/2 ft), to get a great feel what cars would do on a 31 ft. track.

Your timing system must show reaction times different than Trackmate.

Is .500 a perfect light, vs .000 or .0000, on a Trackmate?

Like I stated above in the first post ....this is R&D.

 

I don’t think Dave was running on 14vdc. Then hot lap 8 passes back to back. I don’t think 

it will be consistent as a brushless motor.

 

Your track could/should have a sensor at the 1/8 mile mark ( that would be close enough )

 

ET’s are slow? You can’t compare apples and oranges as far as a $12 motor goes. Brushless motors don’t react the same as a brushed motor. They leave slower and build power exponentially and consistently.
I’m not done testing yet either, going to change the gears again.

 

.500 is a perfect light on a bracket tree. .400 on the Pro light. So consider the 5 a 0 in the RT.

Thanks for your interest ,there is a lot to learn about this new application of brushless technology.

I’m sure these questions help everybody understand the brushless technology better.

 

Keep em Green!

Bags

[Phil Smith]

Interesting. What motor are you using? What speed controller as well?

[Bags]

Interesting. What motor are you using? What speed controller as well?

Thank you for your interest Phil. 
 

The brushless motor in the car is a Sunny Sky R 1106 outrunner.

 

Its not a speed controller it’s a brushless switch.

 

Keep em Green!

Bags

[MSwiss]

Interesting. What motor are you using? What speed controller as well?

Phil,
He has explained the switch he has invented, in other threads....ones that you have participated in.

http://slotblog.net/...g-racing/page-1

http://slotblog.net/...chnology/page-1

  

Like I stated above in the first post ....this is R&D.
 
I dont think Dave was running on 14vdc. Then hot lap 8 passes back to back. I dont think 
it will be consistent as a brushless motor.
 
Your track could/should have a sensor at the 1/8 mile mark ( that would be close enough )
 
ETs are slow? You cant compare apples and oranges as far as a $12 motor goes. Brushless motors dont react the same as a brushed motor. They leave slower and build power exponentially and consistently.
Im not done testing yet either, going to change the gears again.
 
.500 is a perfect light on a bracket tree. .400 on the Pro light. So consider the 5 a 0 in the RT.

Thanks for your interest ,there is a lot to learn about this new application of brushless technology.
Im sure these questions help everybody understand the brushless technology better.
 
Keep em Green!
Bags

I do have a 1/8 /660 sensor on my drag strip.
Funny cars with $15-$16 motors hit it at .425-.450.

Like I said, much faster than the .550 times you quote for your 31 ft.

I have adjustable power, and use it all the time, breaking in new motors.

The difference in times between 14.0 and 16.4 is not as much as one would.

I think it's an awesome thing you came up with a switch to run brushless motors without an RC speed control.

I'm only posting as a counterpoint, since you are not providing any comparisons with brushed motors, and there are very few drag racers on this page, who could translate the #'s you are providing.

PS-get that funny car out to the 1/4 mile, where you posted results before, and could take more advantage of the exponential acceleration.

That would be interesting.

[Larry Horner]

Drag racing is not really my thing but your car is beautiful Tom and as Dr Brown said in Back to the Future, might as well experiment with style! I also love anytime people experiment in new directions.

 

The discussion of brushless motors leaving slowly but building power exponentially draws immediate parallels to turbo chargers and makes me think of Garrett's new E-Turbo technology. Hybrid motors? Who knows but it's always fun to what if!

[Dave Crevie]

Actually, the times in the .08s were posted with runs fairly close to being back-to-back. Add to this, that when we were doing testing on Mike's newly finished track, we found that dropping the voltage to as low as 12 volts did not significantly change the ET, only the trap speeds. With some cars, dropping the voltage allowed the car to hook up better off the line. And the 660 foot sensor is 1/8th mile. Of note is that the Hawk 11 that posted my .680-ish E.T.s took a nose dive after about 25 or so runs. Possibly a give to the brushless motors. But these are throw-away motors, cheap and easy to change.

 

In my opinion, the limiting factor for the brushless motors will be in the time it takes for the ESC to go full on. That might get solved down the road. But it is the same reason I don't like drag controllers with relays. It takes time for the relay to energize. Milliseconds, I know. But still a delay.

 

IIRC some drag timing systems use .400 reaction time as perfect for standard tree, and .300 for pro tree.  

[Bags]

The R&D blues......changed the pinion from 15 to 17 kept the 48 spur........2 passes later this happened.

He has some torque now. It ran .554 @ 56mph. Lost a little at the 60 foot time. Put a 45 tooth spur 

on it ran about the same but picked up to 60-61 mph and is looking for more track now. 

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[Bags]

Mike said
I'm only posting as a counterpoint, since you are not providing any comparisons with brushed motors, and there are very few drag racers on this page, who could translate the #'s you are providing.

 

 

Here are the “record” passes I have on the board here for heads up classes.

 

SS/AH 125gm Quad 20 C can.  .542 @ 56 mph. Hardbody 

VR 20 F/C  80gm   Proslot VR 20  .431 @ 71 mph  Lexan 

MM/PS  120gm w/.500 1.070 min. Rears Quad 20 C can  .574 @ 54 mph  Hardbody

ECMM/PS 120gm w/.500 1.070 min. Rears Parma or Proslot nowadays S16d .667 @ 48 mph Hardbody 

AA/FC 80gm Open wind bullet .323 @ 99.39 mph yeah it was cool 😎 Lexan 

 

All these motors were “built” to the max too boot. Except the VR motor. It had to run out of the bag.

Good for race day then rebuild for the next time.

 

Hope you guys can compare to the brushless motor a little better.

 

Keep em Green!

 

Bags

[Phil Smith]

If you have any retro chassis builders in your area, you might see if they will brace that motor mount for you.

[Alchemist]

Hi Tom,

 

I value and appreciate your passion for sharing the "brushless technology".

 

 In concurrence  with Slotblog Brother Larry Horner (Hi Larry!) I too, find it exciting/fascinating/interesting to being exposed to alternate methods of motor application.

 

Excellent analogy regarding "turbo/E-turbos" Larry!

 

Thanks for sharing Tom!

 

Ernie

[Bags]

Made a couple of passes with it

 

https://youtube.com/...Q&feature=share