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Which Motor Do I need?
Choosing a brushless motor can be intimidating, but understanding a few specific characteristics you can easily find the perfect motor. Motors with higher winds spin slower and they have a lower Kv (RPM/V). They spin a larger propeller at slower speeds and at a lower current. Motors with lower winds have a higher Kv (RPM/V). They spin a smaller propeller at higher speeds and at a higher current than high turn motors.
To determine the motor, decide on your flying style and aircraft. Is it a sport fast flyer, or a slow plane with a lot of drag? For the high speed airplane a low turn
high KV that spins a small prop fast would be the right choice. For the slow, high drag plane, a high turn motor
(low KV)that can spin a much larger prop and produce a lot of thrust at low speed is what you want.
A very loose comparison is RPM = KV
Low KV = slow RPM, large prop, low AMP (current)
High KV = fast RPM, small prop, high AMP (current)
Below is a motor chart that will assist in choosing a brushless motor based on aircraft weight. However, choosing a motor is dependent on aircraft type, battery and flying style. Below is a chart that will guide you in your choice. When choosing a motor, the battery, electronic speed controller
ESC must be able to handle the current. Clicking on any motor will provide more specific motor information.
Glow to Electric Conversions
|
Glow Size |
GraysonHobby Motor |
Aircraft Weight |
Watts |
ESC |
|
.20 equivalent |
Tower Pro 2908-10 |
(1.5 lbs - 3 lbs) |
300 Watts |
30Amp |
|
.25 - 35 equivalent |
GH 2814 -06 |
(2.1 lbs - 4.25lbs) |
350 Watts |
45Amp |
|
.25 - 35 equivalent |
GH 2814 -08 |
(2.1 lbs - 4.18lbs) |
350 Watts |
45Amp |
|
.30 equivalent |
Tower Pro 2915 - 5 |
(2 lbs - 5 lbs) |
450 Watts |
45Amp |
|
.30 equivalent |
Tower Pro 3015 - 5 |
(2 lbs - 5 lbs) |
500 Watts |
40Amp |
|
.40 equivalent |
GH 2820-06 |
(2.18 lbs - 5.5 lbs) |
550 Watts |
45Amp |
|
0.40 equivalent |
GH 2826-06 |
(4 lbs - 6 lbs) |
550 Watts |
45Amp |
|
0.40 - 0.50 equivalent |
GH 3520-12 |
(3.3lbs - 6.17lbs) |
700 Watts |
65Amp |
|
.60 equivalent |
GH4120-07 |
(4.5 lbs - 7.7 lbs) |
1000 Watts |
70Amp |
|
.60 - .90 equivalent |
GH4130-08 |
(6.6 lbs - 13.25 lbs) |
1300 Watts |
80Amp |
GraysonHobby Park Flyers
|
GH Motor |
(RPM / V) KV |
Aircraft Weight |
Flying Type |
ESC |
|
GH 2204 |
1400 |
3 oz - 10 oz |
Indoor / 3D |
10Amp |
|
GH 2208-17 |
1100 |
7 oz - 17 oz |
Pattern/3D |
20Amp |
|
GH 2208-12 |
1700 |
7 oz - 17 oz |
Pattern/Sport |
20Amp |
|
GH 2208-08 |
2200 |
7 oz - 17 oz |
Micro Parkjets / Speed |
20Amp |
|
GH 2212-15 |
930 |
10.2 oz - 28.2 oz |
3D |
20Amp |
|
GH 2212-13 |
1000 |
10.2 oz - 28.2 oz |
Pattern/3D |
20Amp |
|
GH 2212-10 |
1400 |
10.2 oz - 28.2 oz |
Sport |
20Amp |
|
GH 2212-06 |
2200 |
10.2 oz - 28.2 oz |
ParkJets / Wings |
30Amp |
|
GH 2217-06 |
1500 |
20 oz - 50 oz |
Sport |
30Amp |
|
GH 2217-09 |
1080 |
20 oz - 50 oz |
Pattern/Scale/3D |
30Amp |
Economy Brushless
|
GraysonHobby Motor |
KV (RPM / V) |
Aircraft Weight |
Flying Type |
ESC |
|
TP 2408-21 Star |
1750 |
8 oz - 30 oz |
Sport |
20Amp |
|
TP 2410-12 Star |
970 |
8 oz - 30 oz |
Pattern / 3D |
20Amp |
RC-Tech
|
GraysonHobby Motor |
KV (RPM / V) |
Aircraft Weight |
Flying Type |
ESC |
|
C20 PRO - 15 |
1500 |
8 oz - 25 oz |
Sport |
15Amp |
|
C20 PRO - 20 |
2050 |
8 oz - 25 oz |
Micro Jets |
25Amp |
Grayson Hobby
|
GraysonHobby Motor |
KV (RPM / V) |
Aircraft Weight |
Flying Type |
ESC |
|
Super Mega Jet |
2300kv |
20 oz - 40oz |
Sport / Parkets |
40Amp |
Silver Bullet Series
|
GraysonHobby Motor |
KV (RPM / V) |
Aircraft Weight |
Flying Type |
ESC |
|
Silverbullet C20 |
2100 |
8 oz - 12oz |
ALL |
10Amp |
|
Silverbullet C20 |
2500 |
8 oz - 16 oz |
Sport (Warbirs) |
10Amp |
|