If this is insufficient, you can always configure your Stingray with larger motors and a bigger battery. One of the great things about this kit is there's plenty of room for expansion! It's quite solidly constructed, too, so should be relatively robust against "un-programmed sudden deceleration" events...
The rated output of the shaft on the gearbox at the rated voltage is 310 RPM. To calculate speed in inches/second you would use the formula Speed = (RPM (diameter * PI) / 60). So given 310 RPM and the wheel diameter of 4-7/8" this comes out to 2 meters/second or 6.57 feet/second.
Nak is correct though, the chassis was designed with modding in mind. The gauge of the metal is low enough to make it easy to mill while maintaining stability. We settled on the gearbox motors we have because of the price/performance ratio. Inevitably there are some (including myself) who would spend more money for higher performance. We originally tested some 12V motors that had built-in encoders. I don't remember where we got them from, but I will attach a picture of these motors next to the current motor (pulled from my Stingray) for comparison.
Note that these motors had a larger output shaft and were rated at 12V, but they also had built-in quadrature encoders (something we'll have real soon). Variance in speed between these motors at the same voltage was pretty significant too, which is probably why they have the encoders built-in. But the main thing is these were quite expensive.
The 310 rpm is probably under no load. Maximum power output is usually at about 1/2 no load speed. So max speed will depend on how heavy your Stingray is, ground conditions (hard floor or shag carpet), and going uphill or downhill. Also if you are running at 100 percent power, you cannot speed up a motor to turn. Of course you can slow down the other motor. I usually add to one motor and subtract from the other.
Actually, in retrospect, I think we got them from the manufacturer printed on the label. I believe they runs ads periodically in Nuts & Volts and/or Servo and/or Robot magazine. That's how I found them the first time.· In fact, here's the link: http://www.shayye.com.tw/EngVer/Products-micro/microList.htm
Comments
The rated output of the shaft on the gearbox at the rated voltage is 310 RPM. To calculate speed in inches/second you would use the formula Speed = (RPM (diameter * PI) / 60). So given 310 RPM and the wheel diameter of 4-7/8" this comes out to 2 meters/second or 6.57 feet/second.
Nak is correct though, the chassis was designed with modding in mind. The gauge of the metal is low enough to make it easy to mill while maintaining stability. We settled on the gearbox motors we have because of the price/performance ratio. Inevitably there are some (including myself) who would spend more money for higher performance. We originally tested some 12V motors that had built-in encoders. I don't remember where we got them from, but I will attach a picture of these motors next to the current motor (pulled from my Stingray) for comparison.
Note that these motors had a larger output shaft and were rated at 12V, but they also had built-in quadrature encoders (something we'll have real soon). Variance in speed between these motors at the same voltage was pretty significant too, which is probably why they have the encoders built-in. But the main thing is these were quite expensive.
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Chris Savage
Parallax Engineering
50 72 6F 6A 65 63 74 20 53 69 74 65
John Abshier
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Chris Savage
Parallax Engineering
50 72 6F 6A 65 63 74 20 53 69 74 65
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