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Riva Aquarama special edition 1970 reachs 45km/h in 20m drag run

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I just motorize another riva aquarama special 87 cm (scale 1/10), its max speed is 45km/h; while the real riva aquarama's max speed is 68 km/h. How to make a mahagoni riva aquarama conquer the speed 68 km/h?
Anyone here make mahagoni boat run faster than 45km/h ??? Please share the ideas

Hull: self-made based on riva aquarama special 1970 (tantrasway)
Motor: dual brushless motor with 1800Kv water-cooled
ESC: dual 120A water-cooled
Battery: dual LIPO 4s 4000mAh, 30C
Shaft: 4mm flexible shaft
Propeller: dual nylon 3-blade propellers
Rudder: dual CNC aluminum rudders
Standard servo with dual bearings and 180oC rotational range
Radio controller: 2.4ghz 3 Channel Radio System with 800mAh battery
Water-cooling system


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