50CC-65CC BRUSHLESS OUTRUNNER MOTOR
Thanks for purchasing the ElectriFly RimFire™ 50cc-65cc Brushless Motor! In order to complete your power system you will need to select the correct LiPo batteries, propeller, ESC, and motor mount. The following instruction manual will explain what you will need to complete your new RimFire power system.
1 MOTOR
87.3mm (50cc) |
|
97.3mm (65cc) |
80mm |
Thread Pitch:
10 ρ1.25mm
67mm
10mm
the current in check. If a higher voltage battery is replaced by a lower voltage battery, the size of the propeller can be increased to keep the motor at its rated current.
Another possibility to fine tune the power system’s performance is to use another motor with higher kV to increase the current or a lower kV to lower the current.
2 ACCESSORIES
A B
C
E
F
D |
Items not shown |
actual size. |
AGreat Planes® Pro™ Thread Locking Compound (GPMR6060)
BStandoff Brushless Motor Mount XX-Large (GPMG1275)
C4mm/6mm Female Bullet Adapter (GPMM3118)
D6mm/4mm Female Bullet Adapter (GPMM3119)
E6mm Bullet Connector Male (GPMM3116)
F6mm Bullet Connector Female (GPMM3117)
RimFire 50cc (80-75-230) (GPMG4800)
Motor Output Shaft Size: 10mm
Motor Diameter: 80mm [3.14”] Motor Can Length: 75mm [3.0”]
Mounting Space Length: 87.3mm [3.44”]
Weight: 1250g [44.1oz]
Input Voltage: 33.3-55.5V (9-15S LiPo)
Max Continuous Current: 110A (at 12S) Max Continuous Power: 5000W
Max Surge Current: 135A (at 12S) Max Surge Power: 6500W
Prop Range: 22x8 to 26x10 glow/gas prop
Sport Aircraft Weight: 12.7kg [28lbs] [460oz] 3D Aircraft Weight: 8.17kg [18lbs] [288oz]
RimFire 65cc (80-85-160) (GPMG4805)
Motor Output Shaft Size: 10mm
Motor Diameter: 80mm [3.14”]
Motor Can Length: 85mm [3.35”] Mounting Space Length: 97.3mm [3.83”]
Weight: 1480g [52.2oz]
Input Voltage: 33.3-55.5V (9-15S LiPo)
Max Continuous Current: 135A (at 12S) Max Continuous Power: 7500W
Max Surge Current: 150A (at 12S) Max Surge Power: 8400W
Prop Range: 22x10 to 26x12 glow/gas prop
Sport Aircraft Weight: 19.7kg [42lbs] [665oz]
3D Aircraft Weight: 11.79kg [26lbs] [416oz]
Understanding Motors
kV (rpm/volt): This is a number that gets thrown around quite a bit when talking electrics and it is important to know what it is. kV is the number of rpm a motor will spin per each volt applied (rpm/volt) under no load.
This means that basically a motor that has a kV of 1000 when connected to a 12V battery will try to spin at 12,000rpm (1000x12) under no load. Likewise a 3500kV motor will try to spin at 42,000rpm (3500x12) under no load.
When a propeller is attached to the motor, the motor will try to spin the prop at the rated kV. Depending on the diameter and pitch of the propeller (the larger the diameter or higher the pitch, the harder it is for the motor to spin), the motor’s current draw increases as the load increases and decreases as the load decreases. There are meters available from your hobby dealer that measure current and voltage.
Because every motor has a maximum current it can take based on its design and cooling ability, the maximum size of propeller that can be used with each motor can be determined. Use a propeller that’s too large and the motor will spin at a much lower rpm than its rated kV, causing it to draw a lot of current and overheat. If the propeller/fan is too small, it will require little effort (current) to turn the prop at the rated kV.
Ideally the motor should be matched with a propeller that causes the motor to draw 80-100% of its rated maximum constant current. Once a power system is set up, it can be fine-tuned by adjusting the propeller size and measuring the amount of current the motor is drawing.
Please note that the kV of a motor does not change with voltage, but if a higher voltage is applied to the motor, it will try to spin the same propeller at a higher rpm. This will cause the motor to draw more current and possibly exceed the maximum rated current of the motor. So, if a battery with lower voltage is replaced with one with a higher voltage, it is recommended that a smaller propeller be used to keep
3 PROPELLERS
Because of the high torque of this motor and its ability to spin at high rpm, we recommend against using electric-only propellers. Below is a listing of a few of the recommended props.
TOPQ5260 |
22x10 |
Power Point™ |
ZINQ1803 24x10 |
Pro-Zinger |
TOPQ5270 |
24x10 |
Power Point |
ZINQ2014 26x10 |
Zinger Prop |
ZINQ1403 |
20x10 |
Pro-Zinger |
ZINQ2017 26x12 |
Zinger Prop |
ZINQ1603 |
22x10 |
Pro-Zinger |
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|
4 LI-POLY BATTERIES (LIPO)
Number of Cells
Batteries can be connected in series (S) or in parallel (P). A LiPo battery is advertised by voltage and capacity where each cell carries 3.7 volts. A 4S LiPo battery would be 4 x 3.7V or 14.8V. The capacity is listed in milliamp hours or mAh, so a 5300mAh battery can discharge a maximum of 5300 milliamp-hours or 5.3 amp-hours. Please also be aware of the battery’s discharge current delivery capability, or C-rating. A 25C, 5300mAh battery will deliver 132.5A of current regardless of voltage.
For the most up-to-date list of LiPo batteries, check out the ElectriFly web site at: www.electrifly.com
Stock # |
Voltage |
Capacity |
Weight |
Type |
|
|
|
|
|
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GPMP0540 |
7.4V |
(2S) |
3350mAh |
6.6 oz (188g) |
25C LiPo |
GPMP0541 |
11.1V |
(3S) |
3350mAh |
9.7 oz (275g) |
25C LiPo |
GPMP0542 |
14.8V |
(4S) |
3350mAh |
12.2 oz (347g) |
25C LiPo |
GPMP0543 |
18.5V |
(5S) |
3350mAh |
15.3 oz (435g) |
25C LiPo |
GPMP0560 |
7.4V |
(2S) |
5300mAh |
10.3 oz (291g) |
25C LiPo |
GPMP0561 |
11.1V |
(3S) |
5300mAh |
15.4 oz (426g) |
25C LiPo |
GPMP0562 |
14.8V |
(4S) |
5300mAh |
19.6 oz (555g) |
25C LiPo |
GPMP0563 |
18.5V |
(5S) |
5300mAh |
24.6 oz (697g) |
25C LiPo |
5 ELECTRONIC SPEED CONTROL (ESC)
The following brushless electronic speed controls are compatible with these motors.
ElectriFly Silver Series 80A Brushless ESC High-Volt (GPMM1860)
ElectriFly Silver Series 100A Brushless ESC High-Volt (GPMM1870)
Castle Creations Phoenix
110 High-Volt Brushless
ESC (CSEM2018)
Kontronik™ Power Jazz 63V Brushless ESC 120A (KONM3140)
6 DETERMINE WHAT YOU NEED TO BUILD YOUR POWER SYSTEM
If you know the approximate weight of your airplane, including the motor and battery, and the performance you want from it, answer the questions below to determine the correct power system for your plane. You may need to make more than one calculation using different motors and battery combinations. See the battery section for some of the battery weights for the suggested batteries.
1.Perform the following calculation to determine the wattage required:
•If you expect trainer-like performance, then multiply 75 x
Airplane Weight (lbs)
•If you expect aerobatic or high speed performance then multiply 100 x Airplane Weight (lbs)
•If you expect 3D or extreme performance multiply 150 x
Airplane Weight (lbs)
2.The number you get is the minimum wattage you will need for your plane to perform as you wish.
3.Select a LiPo battery voltage within the recommended range of the motor. Keep in mind that voltage affects prop size (lower volts require bigger props). 12S is a good reference point to start at. See “Sample Power Systems” in this manual.
4.Divide the minimum wattage that you came up with by the voltage you selected. This will give you the current you should expect.
5.Determine the battery capacity needed based on the current draw of your system and your desired flight time. Be sure to select batteries with the proper C-rating that can deliver the current you need.
6.Determine the ESC you need based on the system current draw. See the ESC section for recommended ESCs.
In addition to this procedure, you can also visit the Great Planes ElectriFly web site for descriptions of the power systems recommended for our line of electric and glow airplanes as well as more detailed explanation on the subject.
RECOMMENDED |
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RimFire |
12S 5300mAh 25C LiPo, 120A ESC, |
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SETUP |
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50cc |
22ρ8 glow/gas prop |
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RimFire |
12S 5300mAh 25C LiPo, 120A ESC, |
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65cc |
24ρ8 glow/gas prop |
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