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35mm POWER
SYSTEM
Congratulations, you have just purchased one of the RimFire 35mm power system components. All the components are sold separately to allow you to customize your power system to your airplane. The components needed to assemble your complete RimFire 35mm power system are: RimFire 35mm motor, propeller, propeller adapters and brushless speed control. This instruction sheet explains how to determine what you will need and how to assemble each component.
1 MOTORS
Model | Stock # |
RimFire .10 (35-30 -1250) | GPMG4595 |
RimFire .15 (35-36 -1200) | GPMG4620 |
The RimFire motors are labeled to provide the most information at a glance. For example: the RimFire .10 (35-30-1250) is 35mm in diameter, 30mm long and has a kV (rpm-per-volt) of 1250.
30mm OR 36mm | |
19mm | |
4mm | |
35mm | 19mm |
17mm | 3mm |
Mount Screw | |
Motor Output Shaft | Weight |
Diameter and Length | (30mm) | 71g | [2.5oz.] |
4 ρ 17mm [0.16' ρ 0.68'] | (36mm) | 102g | [3.6oz.] |
RimFire .10 (35-30-1250) | RimFire .15 (35-36-1200) | |
Input Voltage: 7.4 – 11.1V | Input Voltage: 11.1– | 14.8V |
Max Surge Current: 35A | Max Surge Current: | 55A |
Max Surge Watts: 390W | Max Surge Watts: 650W | |
2 ELECTRONIC SPEED CONTROL (ESC)
An ESC is basically the device that controls your motor through your radio system. Never run any RimFire motors with a brushed ESC. It will not work and you may damage both the motor and the ESC. Always use a brushless ESC. ElectriFly offers Brushless ESCs that will work with the RimFire 35mm motors.
•ElectriFly Silver Series 35 (SS-35) ESC (GPMM1830) for 35A maximum constant current draw.
•The Silver Series 45 (SS-45) ESC (GPMM1840) for 45A maximum constant current draw.
•The Silver Series 60 (SS-60) ESC (GPMM1850) for 60A maximum constant current draw.
The SS-45 and SS-60 ESCs come with 4mm female bullet connectors that require an adapter (GPMM3123) to plug into the 3.5mm male connectors installed on the RimFire 35mm motors. Also, all of these ESCs come with a Deans® Ultra Plug® battery connector that matches the connectors that are found on most batteries that it will use.
3 BRUSHLESS MEDIUM MOTOR MOUNT
1.Front Plate (1)
2.Back Plate (1)
3.4-40x1/4' SHC Screw (8)
4.#4 Flat Washer (10)
5.Motor Bracket
(1, not used on RimFires)
6.4-40x1/2” SHC Screw (2)
7.4-40 Lock Nut (2) (not used)
The ElectriFly Brushless e- dium Motor Mount combines ease
of installation with the adjustability to fit most motor applications. The Medium Motor Mount is designed to fit the bolt pattern of the Great Planes® .20 –.48 and .40 –.70 Nylon Engine Mount. This easily allows the conversion of a glow-powered plane to electric-powered.
4 PROPELLERS
There is a wide selection of propellers available for electric use. The RimFire 35mm motors use high performance slow fly electric props. The larger the propeller used, the more current your motor will draw. The smaller the propeller, the less current the motor will draw.
Shown are a few of the recommended electric props. Due to the large range of propellers and the constant addition of new sizes, visit our web sites at www.electrifly.com and www.greatplanes.com for the most up-to- date listing of electric type props.
APCQ0945 | 9 × 4.5 Electric | APCQ4129 | 11 × 8 Electric | |||
APCQ4118 | 9 | × 6 Electric | APCQ4130 | 12 × 6 | Electric | |
APCQ4120 | 10 | × 5 | Electric | APCQ4136 | 12 × 10 | Electric |
APCQ4123 | 10 | × 7 | Electric | APCQ3065 13 × 6.5 | Electric | |
APCQ1055 11 × 5.5 | Electric | APCQ4022 | 18 × 10 | Electric | ||
APCQ4128 | 11 | × 7 | Electric | |||
5 PROPELLER ADAPTERS
The RimFire 35mm motor comes with a prop adapter that mounts directly to the motor case. If the RimFire 35mm motor needs to be mounted so that the prop is mounted on the motor shaft, the motor requires a 4mm prop adapter collet type (GPMQ4965), or set screw type (GPMQ4936).
GPMQ4936 4mm | GPMQ4965 4mm |
Set Screw Type | Collet Type |
6 BATTERIES: NUMBER OF CELLS |
Cells can be connected in series or in parallel. Usually batteries are labeled by their number of cells such as a 3-cell LiPo. This means the cells are connected in SERIES (S). Arranging batteries in series gives you more power (higher voltage).
•Each LiPo battery has 3.7V, so a 3-cell LiPo battery has 3.7×3 = 11.1V
If you need a higher voltage than what is available in the LiPo battery line, you will need to connect two battery packs together in series. If you need a battery voltage of 14.8V you can use the Series Y-Connector (GPMM3143) to connect two 7.4V batteries together.
If a battery is arranged in PARALLEL it might be labeled as (P). Arranging the batteries in parallel will give you more duration (more capacity).
All LiPo batteries have a rated discharge that must not be exceeded or the battery will be damaged. They may say 20C max. discharge rate or 25C max. discharge rate. This means that the discharge rate (current draw of the motor) must not be more than 20 or 25 (20C or 25C) times the capacity of the battery. The capacity is expressed in milliamp hours (2200mAh). It can also be expressed in amp hours (2.2 Ah).
A LiPo battery with a capacity of 2200mAh with a 25C discharge rate can be discharged at 55 amps, 2.2Ah×25C = 55 amps. If the power system draws more than 55 amps, the batteries will have to be connected in parallel to increase the capacity. Two 2200mAh batteries in parallel have a capacity of 4400mAh or 4.4Ah×25C = 110 amp discharge rate.
ElectriFly offers a full line of LiPo batteries. Airplanes that use the RimFire 35mm motors will typically use batteries with a capacity of 1300mAh to 3350mAh with the higher capacity batteries delivering more flying time but also being heavier. All of the batteries have connectors that fit the recommended ESCs.
Due to the constantly changing battery technology, check out the ElectriFly web site at www.electrifly.com for the most up-to-date listing of the ElectriFly battery line.
No. of | |||||
Stock # | Voltage | Capacity | Weight | Cells | Type |
GPMP0504 | 7.4V | 1300mAh | 2.7 oz (77g) | 2 | 25C |
GPMP0505 | 11.1V | 1300mAh | 4.0 oz (112g) | 3 | 25C |
GPMP0510 | 7.4V | 1500mAh | 2.9 oz (83g) | 2 | 25C |
GPMP0511 | 11.1V | 1500mAh | 4.3 oz (121g) | 3 | 25C |
GPMP0514 | 7.4V | 1800mAh | 3.6 oz (102g) | 2 | 25C |
GPMP0515 | 11.1V | 1800mAh | 5.2 oz (148g) | 3 | 25C |
GPMP0519 | 7.4V | 2200mAh | 4.4 oz (125g) | 2 | 25C |
GPMP0520 | 11.1V | 2200mAh | 6.3 oz (179g) | 3 | 25C |
GPMP0521 | 14.8V | 2200mAh | 8.2 oz (233g) | 4 | 25C |
GPMP0540 | 7.4V | 3350mAh | 6.6 oz (188g) | 2 | 25C |
GPMP0541 | 11.1V | 3350mAh | 9.7 oz (275g) | 3 | 25C |
GPMP0542 | 14.8V | 3350mAh | 12.2 oz (347g) | 4 | 25C |
7 DETERMINE WHAT YOU NEED TO BUILD YOUR POWER SYSTEM
Now that you have one component for your power system, there are several different ways to select the rest. In time, experience will help you to determine what works best for you, but an easy way to determine what you need now is the following.
Procedure #1: If you know the size of the propeller you want to turn and the rpm, then look at the chart included in the packaging and:
1. Find the combination that delivers the closest performance to what you want (refer to the ElectriFly web site for typical combinations), or refer to the airplane manufacturer’s recommendations.
2. Note the recommended battery voltage.
3. Determine the battery capacity needed based on the current draw of your system and your desired flight time.
4. Determine the ESC you need based on the system current draw. See the ESC section.
Procedure #2: 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-like 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. Watts = current (A) × voltage
(V). Using suggested power system combinations for reference, determine what combination gives you the performance you want based on wattage and maximum propeller size that will fit on the plane.
3. Choose a battery voltage within the recommended range of the motor.
4. Determine the battery capacity needed based on the current draw of your system and your desired flight time.
5. Determine the ESC you need based on the system current draw.
In addition to these two procedures, 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 | RimFire .10 | 3S Battery, 10ρ 7 | E Prop |
SETUP | RimFire .15 | 3S Battery, 11ρ 7 | E Prop |
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 a motor with a kV of 1000 when connected to a 12V battery will try to spin at 12,000rpm (1000×12) under no load. Likewise a 3500kV motor will try to spin at 42,000rpm (3500×12) 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 to spin), the motor’s current draw can be increased or decreased. 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. If the propeller is too large, 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 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 anothermotorwithhigherkVtoincreasethecurrentoralowerkVtolower the current.
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