User Manual

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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 ﬁ t

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 ﬂ ight 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

SETUP

RimFire .10

RimFire .15

3S Battery, 8

4.5 SF Prop

3S Battery, 9

4.5 SF Prop

3S Battery, 10

7 E Prop

3S Battery, 11

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 ﬁ ne-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 ﬁ ne 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.

PROPELLERS

There is a wide selection of propellers available for electric use. The RimFire

35mm motors use high performance slow ﬂ y 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.electriﬂ y.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

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

Set Screw Type

GPMQ4965 4mm

Collet Type

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 ﬂ ying time

but also being heavier. All of the batteries have connectors that ﬁ t the

recommended ESCs.

Due to the constantly changing battery technology, check out the ElectriFly

web site at www.electriﬂ y.com for the most up-to-date listing of the

ElectriFly battery line.

Stock #

GPMP0504

GPMP0505

GPMP0510

GPMP0511

GPMP0514

GPMP0515

GPMP0519

GPMP0520

GPMP0521

GPMP0540

GPMP0541

GPMP0542

Voltage

7.4V

11.1V

7.4V

11.1V

7.4V

11.1V

7.4V

11.1V

14.8V

7.4V

11.1V

14.8V

Capacity

1300mAh

1500mAh

1800mAh

2200mAh

3350mAh

Type

25C

No. of

Cells

Weight

2.7 oz

4.0 oz

2.9 oz

4.3 oz

3.6 oz

5.2 oz

4.4 oz

6.3 oz

8.2 oz

6.6 oz

9.7 oz

12.2 oz

(77g)

(112g)

(83g)

(121g)

(102g)

(148g)

(125g)

(179g)

(233g)

(188g)

(275g)

(347g)

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 ﬂ ight time.

❏

4. Determine the ESC you need based on the system current draw. See

the ESC section.

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.

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.

Weight

71g

102g

[2.5oz.]

[3.6oz.]

(30mm)

(36mm)

Motor Output Shaft

Diameter and Length

4 r 17mm [0.16" r 0.68"]

35mm

19mm

3mm

Mount Screw

4mm

17mm

30mm OR 36mm

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

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.

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)

4-40 Lock Nut (2)

(not used)

The ElectriFly Brushless Me-

dium Motor Mount combines ease

of installation with the adjustability to ﬁ t most motor applications. The

Medium Motor Mount is designed to ﬁ t 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.

es ease

35mm POWER

SYSTEM

Summary of content (2 pages)

PAGE 1
4 35mm POWER SYSTEM 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.
PAGE 2
8 ASSEMBLE YOUR POWER SYSTEM Once the required RimFire motor has been determined, it needs to be installed on the plane. To determine the best mounting system, the distance from the firewall to the front of the prop adapter first needs to be determined. It can be mounted directly to the firewall using the RimFire aluminum mounting plate (included with the motor). or an ElectriFly Medium Motor Mount (GPMG1255). Both mounting systems are direct replacements for the Great Planes® .40.70 nylon engine mount.