Designed for radio-controlled sailboat racing.  Designed for radio-controlled sailboat racing. Now equipped with LoRa control board with one-mile range and 200ft Bluetooth LE range. (LoRa range is between buoys, not between phone and buoy. You will need a buoy nearby to act as a hub/translator to control distant spoke buoys.)
 
Weight 9 lbs
Height 32 inches
diameter-tube 3.5 inches (4.0" caps)
diameter-bumper disk 10 inches
Battery type LiPo, 2S (8.4V)
Battery capacity 5 Amp-hour
Idle power consumption 130mA
Now equipped with LoRa control board
    Bluetooth range 200ft
    LoRa range 5000ft
Radio control input capable (2-channel)
Brushless motors with stainless steel bearings
Warrantee:  One year