Protech ZOOM 425 ccpm Spécifications Page 201

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standard.
For example, the "Nippy Black" series of brushless motors cannot be used for micro helis be-
cause it is designed for a "firewall mount" and therefore the motor mounting holes are on the
rear of the motor. Other examples include the Typhoon Micro series which have a triangle-
shaped pattern for the motor mounting holes, which do not fit standard helicopter motor
mounts.
The Hacker B20-xxS/L, Feigao 138084xxS/L, Himaxx HA20xx, and Model Motors MiniAC
1215/xx motors have a "bearing bump" which makes installation in helicopters rather difficult.
Maxx Products sells the a motor adapter (ACC3900) which eliminates this problem.
30.2.2.4. Shaft diameter and available pinion sizes
Theoretically, an Orbit 15-16 (1067 rpm/V) will fly an ECO 8. However, you would need about
a 28-30 tooth 5mm pinion, and the largest available 5mm pinion is 24 tooth. So, the available
pinion sizes will limit your motor choices.
30.2.2.5. Cooling options
For inrunner motors, a heatsink or fan is recommended when flying in ambient temperatures
over about 70F/21C or when flying for long duration with lithium-ion or lithium-polymer batter-
ies.
The Hacker B20, B40, and B50 heatsinks are probably the most commonly used for heli-
copters.
GWS style heatsink
Table 30.5. Heatsinks
Motor Heatsink
20mm diameter motors (Hacker B20,
HiMaxx 2015/2025 etc)
Hacker B20 heatsink
Sparrow Products 20mm heatsink
Hyperion 20L heatsink
23mm diameter motors: GWS EHS-100 (green color)
24mm diameter motors (Speed 300 GWS EHS-300 (red color)
Technical Appendix
188
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