Specifications

Chapter 5. Brushless Motor Upgrade Paths

You may want to choose a brushless motor which is usable in both your first fixed pitch heli-

copter and your second collective pitch helicopter. This is a little tricky but definitely possible if

you plan wisely.

In the following section, 10-12T means 10 tooth to 12 tooth pinion. The lower tooth pinions are

for duration, and the higher ones are for power.

5.1. Corona upgrade paths

There are three possible upgrade paths from the Corona: the ECO 8, the Eolo, and the Voy-

ager E. All of these helicopters can use 3.17mm shaft motors in approximately the same Kv

range as the Corona.

5.1.1. Corona motors usable in an ECO 8

This requires choosing a 3.17mm shaft motor with a Kv of about 2400-2600. This results in a

mild motor for the Corona, which becomes a power motor when moved to the ECO 8 on 10

cells. If you desire to use a Corona motor which will become a duration ECO 8 motor, then you

will need a motor with a lower Kv (about 2200-2400) and use a larger tooth pinion on the

Corona.

A motor with 3000 Kv is usable on an ECO 8 with 8 cells, but not really recommended for 10

cells.

5.1.1.1. Hacker C40-10L, Kv = 3000 rpm/V (powerful, but runs hot)

• Corona: 11-12T/8 cells

• ECO 8 : 10T/8 cells

5.1.1.2. Hacker C40-12L, Kv = 2500 rpm/V (powerful, but runs hot)

• Corona: 12-13T/8 cells

• ECO 8 : 12-14T/8 cells, 10-12T/10 cells)

5.1.1.3. Mega Motor 16/25/3, Kv = 1700 rpm/V (mild)

• Corona: 18T/8 cells

• ECO 8: 17T/8 cells, 14T/10 cells

5.1.1.4. Mega Motor 22/20/3HTDS, Kv = 1850 rpm/V (powerful)

• Corona: 15T/8 cells

• ECO 8 : 13-15T/10 cells