28.3. Brushless motor upgrade paths

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

28.3.1. Corona upgrade paths

There are three possible upgrade paths from the Corona: the ECO 8, the Eolo, and the Voyager E. All of these helicopters can use 3.17mm shaft motors in approximately the same Kv range as the Corona.

28.3.1.1. 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.

28.3.1.1.1. Hacker C40-10L, Kv = 3000 rpm/V (powerful, but runs hot)
  • Corona: 11-12T/8 cells

  • ECO 8 : 10T/8 cells

28.3.1.1.2. 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)

28.3.1.1.3. Mega Motor 16/25/3, Kv = 1700 rpm/V (mild)
  • Corona: 18T/8 cells

  • ECO 8: 17T/8 cells, 14T/10 cells

28.3.1.1.4. Mega Motor 22/20/3HTDS, Kv = 1850 rpm/V (powerful)
  • Corona: 15T/8 cells

  • ECO 8 : 13-15T/10 cells

28.3.1.2. Corona motors usable in a Eolo

This requires choosing a 3.17mm shaft motor with a Kv of about 3300. This results in a power motor for both the Corona and the Eolo. The Mega 16/15/3 is fairly mild for both Corona and the Eolo.

28.3.1.2.1. Mega 16/15/3, Kv = 3000 rpm/V
  • Corona: 10T

  • Eolo : ?

28.3.1.2.2. Hacker C40-12S, Kv = 3500 rpm/V
  • Corona: 10T

  • Eolo : stock pinion

28.3.1.2.3. Hacker C40-9L, Kv = 3333 rpm/V
  • Corona: 10T

  • Eolo : stock pinion

The Hacker C40-12S is a little small for the Eolo and is probably not suitable for the Eolo in warmer weather.

28.3.1.3. Corona motor usable in a Voyager E

This requires choosing a 3.17mm shaft motor with a Kv of about 3700. This results in a power motor for both the Corona and the Voyager. You must be careful to limit the throttle on the Corona because the maximum headspeed of 2000 will be exceeded if the throttle is not limited.

28.3.1.3.1. Hacker C40-8L, Kv = 3750
  • Corona : 10T

  • Voyager: stock pinion

28.3.2. Piccolo upgrade paths

The FP Piccolo requires a motor with a Kv of about 2500. There are two upgrade paths available: the Piccolo CP kit or the Piccolo Pro, which both require a motor with a Kv of about 3000.

The B20-31S and B20-18L have a Kv that's a little too high for an FP Piccolo so the flight time will be short, but they will be powerful later in a CP Piccolo.

Table 28.5. Piccolo Upgrade Motors

MotorKvFP PinionCP Pinion
B20-36S25008T10T
B20-31S30008T10T
B20-18L30008T8T