Just How Fast Is It? - Page 5

Ghost of Akina · #61 02-03-2003, 07:49 PM

can i let the bit pick up speed in the air by holding the rear off the ground then letting it drop after around a minute?

batesjm · #62 02-03-2003, 09:27 PM

What ever floats your boat!

fuzzy2cell · #63 02-05-2003, 09:42 AM

Quote:

Originally posted by Spanky
hey fuzzy,

how did you attach that battery? it dosent look like it was soldered, and second if you got it at RS what was the part number?

thanks

I can't remember the part number, but it came in a 6v battery package for a camera. The wires just stick to the battery while it's going. I did it to a shen qi wei, and it turned up 580 SMPH!!

fuzzy2cell · #64 02-05-2003, 09:42 AM

Quote:

Originally posted by Spanky
hey fuzzy,

how did you attach that battery? it dosent look like it was soldered, and second if you got it at RS what was the part number?

thanks

I can't remember the part number, but it came in a 6v battery package for a camera. The wires just stick to the battery while it's going. I did it to a shen qi wei, and it turned up 580 SMPH!!

fuzzy2cell · #65 02-05-2003, 09:42 AM

Quote:

Originally posted by Spanky
hey fuzzy,

how did you attach that battery? it dosent look like it was soldered, and second if you got it at RS what was the part number?

thanks

I can't remember the part number, but it came in a 6v battery package for a camera. The wires just stick to the battery while it's going. I did it to a shen qi wei, and it turned up 580 SMPH!!

fuzzy2cell · #66 02-05-2003, 09:42 AM

Quote:

Originally posted by Spanky
hey fuzzy,

how did you attach that battery? it dosent look like it was soldered, and second if you got it at RS what was the part number?

thanks

I can't remember the part number, but it came in a 6v battery package for a camera. The wires just stick to the battery while it's going. I did it to a shen qi wei, and it turned up 580 SMPH!!

fuzzy2cell · #67 02-05-2003, 09:44 AM

sorry, i posted it too many times

batesjm · #68 02-05-2003, 11:55 AM

What kind of runtimes do you get from the 6V battery?

gtr2112 · #69 02-06-2003, 05:43 PM

i just tested my 3 best shens on the treadmill.
2.6 clone motor with 9:86.1 and 7 tooth pinion=4.5; 315mph scale
2.6 tomy 9:86.1 and 7 tooth pinion=5; 350mph scale
3.0 Zcar motor with racing gears and 8 tooth pinion=6; 420mph scale. i ran them till they started slowing down just to make sure. did it twice to each car. same results. i don't think i'd want to go any faster. hard to control them as it is.

BabyKiller · #70 02-06-2003, 05:58 PM

Quote:

Originally posted by fuzzy2cell
i put zipzap gear & axle combo on the microsizer subbie, and i hit 280 scale mph!

lol um that gear ratio is only for bit/kit racers i do not believe there that ratio

DoctorDyna · #71 02-08-2003, 05:26 PM

Treadmill Test
Treadmill = Pro Form 995 SEL Flat Incline

Zip chassis
Motorworks PCB
Duel Cell 150MahNiMH
R-Spec Motor
Zip Steering
Zip Blue Gears and Axle(torgue gears) seen next to car..
6.2 MPH

Same setup except changed axle and gears..(speed gears)
Microsizer light green/teal gears/soft tires
8.4MPH

90 second charge with a stand alone three AA battery charger..

chelboed · #72 02-09-2003, 01:55 AM

I'm running a Precious Char-A PCB in my Microsizer bB with a weird clone motor that I have not seen before. It acts like a 3.2 to 3.5 but has TONS of torque. I use the teal gears and a standard 2 cell mod with a potentiometer.

about 8 feet per second = 28800 feet per hour = 5.45 MPH

Zephyranthes · #73 02-09-2003, 04:17 PM

Here is the easiest way to figure scale speed.

Here is the equation for scale mph and explanations why you do them for people how really want to understand the equation.

If you want to know the gear ratios with a 7 tooth pinion gear (K.I.T. Racing pinion gear), here are the ratios. I recommend using this pinion gear because it visibly improves speed. Light green 8.25:1 gears with a 7 tooth pinion gear becomes 7.07:1. Orange 9.86:1 gears become 8.45:1. Light blue 12:1 gears become 10.2:1.

Take your motor rpm. (3.0 = 30,000)

Divide the motor rpm by the corresponding gearing you have. 56(8.25:1 gears), 48(8.25:1 gears with 7 tooth pinion), 67(9.86:1), 57(9.86:1 gears with 7 tooth pinion), 81(12:1 gears), 69(12:1 gears with 7 tooth pinion), 31(4.57:1 gears), 26(3.95:1 gears), or 23(3.43:1 gears). This number is the ratio between the motor rpm and feet per minute.

Multiply it by 60 for you want miles per HOUR

Multiply it again by 64 for the scale of a Bit is 1:64

Divide by 5,280 for there are 5,280 feet in a mile.

(If you are using all MicroSizer stuff, they have a chart for rpms, but if you have 3.0's, different gears and stuff, then use this formula.)

I calculated my car to go 457 scale mph with a 3.0 motor, 7 tooth pinion gear, and 8.25:1 speed gears.

Note: This is the speed if there was no such thing as friction and other uncontrolled variables.

fuzzy2cell · #74 02-11-2003, 07:21 AM

Quote:

Originally posted by batesjm
What kind of runtimes do you get from the 6V battery?

I get anywhere from 60 minutes to 90 minutes

fuzzy2cell · #75 02-11-2003, 07:23 AM

Quote:

Originally posted by Zephyranthes
Here is the equation for scale mph and explanations why you do them for people how really want to understand the equation.

Take your motor rpm. (2.6 = 26,000)

Divide the motor rpm by the corresponding gearing you have. 56(8.25:1 gears), 67(9.86:1), 81(12:1 gears), 31(4.57:1 gears), 26(3.95:1 gears), or 23(3.43:1 gears). This number is the ratio between the motor rpm and feet per minute.

Multiply it by 60 for you want miles per HOUR

Multiply it again by 70 for the scale of a Bit is 1:70

Divide by 5,280 for there are 5,280 feet in a mile.

(If you are using all MicroSizer stuff, they have a chart for rpms, but if you have 3.0's, different gears and stuff, then use this formula.)

I calculated my car to go 455 scale mph with a 3.0 motor, 7 tooth pinion gear, and 8.25:1 speed gears.

You sure, because that doesn't seem right. I'll try that.