PyPilot with Servo Pendulum Windvane

[rgleason]

This one reverses with reverse in polarity, but has gears. 6mm shaft. Not much about the motor's speed or power though.
https://www.ebay.com/p/DC-12v-6rpm-6mm-S...1520808302

Here is another one that looks like it is more powerful....
RS-550s 18v (6v - 24v) DC Motor - High Power & Torque for DIY Electric/Electronic Projects, Drills, Robots, RC Vehicals, Remote Controlled Cars/Robot, Saw
https://www.amazon.com/RS-550s-18v-Elect...BB304QMVXB
Brand ProTechTrader
Item Weight 7.7 ounces
Product Dimensions 1.5 x 1.5 x 2.2 inches
Item model number CECOMINOD043921
Manufacturer Part Number CECOMINOD043921
Folding No
Amperage 10 A
Voltage 12 volts
• Model RS-550S 18v
• Shape of Motor Housing: Round
• Type of Motor: Carbon Brushes
• Construction: Anisotropic Magnet or Rare Earth Magnet
• Operating Voltage: ~6v - 24v
• No Load RPM: ~19300
• No Load Current: ~1.2A
• Stall Torque: ~70.55oz-in (498.2mN-m)
• Efficiency: ~70% • RPM Peak Efficiency: ~17250
• Current Peak Efficiency: ~8-10A Dimensions
• Weight: ~7.7oz (218g) • L: 2.24in (57mm) D: 1.46in (37mm)
• Mounting holes (2): M3
• Mounting Holes: 25mm apart
• Shaft Diameter: 3.15mm (~1/8in)
• Shaft Style: "D"
• Shaft Length: 8.2mm
• Motor Body Diameter: 35mm-37mm
• Motor Body Length: 57mm
• Weight: 7.8oz

Here is a geared motor with forward and reverse
https://www.youtube.com/watch?v=6fjzvRp_XrI

Main motor sources:
https://www.servocity.com/motors-actuators/gear-motors
http://www.lynxmotion.com/c-71-planetary-motors.aspx
http://www.robotshop.com/en/dc-motors.html
http://www.banebots.com/category/GEARBOXES.html

https://www.anaheimautomation.com/produc...4&cdID=212
https://www.sciplus.com/s/c_15/sf_139
https://www.sciplus.com/s/c_15/sf_138

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This one is more expensive, but something like it might be good.
https://www.servocity.com/1621-rpm-hd-pr...-w-encoder

https://www.servocity.com/1621-rpm-hd-pr...-w-encoder