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Congratulations, you have just purchased the

Ammo 20mm 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 Ammo 20mm power system are: Ammo

20mm motors, a 20mm stick mount gearbox,

propeller, propeller adapters and brushless

speed control. This instruction sheet explains

how to determine what you will need and how

to assemble each component.

AMMO 20mm PO

WER SYSTEM

by Great Planes

Model Stock #

20-30-2650 ...............GPMG5115

20-30-3500 ...............GPMG5120

20-30-4300 ...............GPMG5125

20-30-5200 ...............GPMG5130

20-40-2080 ...............GPMG5135

20-40-3500 ...............GPMG5140

20-40-4850 ...............GPMG5145

The Ammo motors are labeled to provide the

most inf ormation at a glance. F or e xample: the

20-40-4850kV is 20mm in diameter, 40mm

long and has a kV (rpm-per-volt) of 4850 rpm.

56.2mm

20mm

30mm

OR 40mm

2.2mm

11.8mm

16mm

2.5mm

MOUNTING

SCREW

Motor Output Shaft

Diameter and Length: 2x10mm [0.08"x0.4"]

Weight (30mm): 45g [1.6oz.]

Weight (40mm): 65g [2.3oz.]

MOTORS

The ElectriFly Ammo motors have high kVs

meaning that they like to run at very high rpm.

A gear drive is used in order to reduce the rpm

allowing a larger, more efficient propeller to be

used. Great Planes ElectriFly offers a 20mm

Stick Mount Gear Drive (GPMG0500) with

several pinions that allow for the following

gear ratios:

Low Ratio> 4.5:1, 5.3:1, 6.4:1, 8:1 <High Ratio

If you use a prop that is too small with a gear

ratio that is too low, the motor will draw very

little current and the prop will turn at too low of

an rpm to produce any usable power. The

higher the gear ratio, the smaller the prop will

need to be and the higher the rpm will be. If the

gear ratio is too high for the prop used, the

motor will dra w excessiv e current and overheat.

The included chart, on the inside of the header

card, shows the motor/prop/gear ratios that

have been tested and found to work well.

The Stick Mount Gear Drive is designed to fit

the 10mm motor mounting stick that is common

on most of today’s small par k flyers.

GEARBOX

An ESC is basically the device that controls

your motor through your radio system. Never

run any Ammo 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 two Silver Series

Brushless ESCs that will work with the Ammo

20mm motors.

ELECTRONIC SPEED CONTROL (ESC)

1. Aluminum Gear Drive Body (1)

2. Aluminum Top Plate (1)

3. 2.5x20mm SHC Screw (2)

4. Prop Saver Hub (1)

5. Rubber O-Ring (1)

6. 2.5x4mm Machine Screw (2)

7. 2.5mm Flat Washer (2)

8. 64 Tooth Spur Gear (1)

9. 2.5x7mm Machine Screw (2)

The Ammo Motor/Silver Series ESC

combination can use NiMH or LiPo batteries.

Typically, NiMH batteries are hea vier but much

more aff ordable for the same capacity as LiPo

batteries. If you want a very light, high-

performance airplane, you might want to use

LiPo batteries, but if weight is not a concern,

then NiMH batteries might be for you.

BATTERIES: CHEMISTRY

Cells can be connected in series or in parallel.

Usually batteries are labeled as 8-cell NiMH or

3-cell LiP o . This means the cells are connected in

SERIES (S). Arranging batteries in series gives

you more power (higher voltage).

• Each NiMH cell has 1.2V, so an 8-cell

NiMH batter y has 1.2x8 = 9.6V

• Each LiPo battery has 3.7V, so a 3-cell

LiPo batter y has 3.7x3 = 11.1V

If you need a higher voltage than what is

available in the LiPo batter y 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 (GPMP3147) to

connect two 7.4V batteries together.

BATTERIES: NUMBER OF CELLS

There is a wide selection of propellers

available for electric use. The 20mm motors

use mainly low-po wer electric type props such

as the Great Planes PowerFlow

™

props and

the APC Slo Flyer 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.

PROPELLERS

The 20mm Stick Mount Gear Drive uses a

3mm prop adapter. If you will be using the

Ammo 20mm Motor without a gear drive it

requires a 2mm prop adapter.

PROPELLER ADAPTERS

GPMQ4930 3mm Set Screw Type

GPMQ6655 .......10x3.5S PowerFlow

GPMQ6660 .......10x4.5S PowerFlow

GPMQ6695 .......11x4.5S PowerFlow

APCQ5000 ..........8x3.8SF Slo-Flyer

APCQ5010 ..........9x4.7SF Slo-Flyer

APCQ5015 ........10x4.7SF Slo-Flyer

APCQ5016 ........10x3.8SF Slo-Flyer

APCQ5017 ........11x3.8SF Slo-Flyer

APCQ5020 ........11x4.7SF Slo-Flyer

APCQ5025 ........11x7SF Slo-Flyer

APCQ5026 ........12x6SF Slo-Flyer

APCQ5027 ........12x3.8SF Slo-Flyer

APCQ5028 ........12x8SF Slo-Flyer

Battery # of Connector

Stoc

k # Voltage Capacity Weight Type Cells Adapter

GPMP0800 7.4V 350mAh .88oz (25g) LiPo 2

GPMP0801 11.1V 350mAh 1.2oz (35g) LiPo 3

GPMP0600 7.4V 640mAh 1.3oz (37g) LiPo 2

GPMP0601 11.1V 640mAh 2.0oz (58g) LiPo 3

GPMP0604 7.4V 910mAh 2.0oz (58g) LiPo 2 GPMP3127

GPMP0605 11.1V 910mAh 3.0oz (85g) LiPo 3 GPMP3127

GPMP0608 7.4V 1250mAh 2.6oz (74g) LiPo 2 GPMP3127

GPMP0609 11.1V 1250mAh 3.9oz (110g) LiPo 3 GPMP3127

GPMP0830 7.4V 1500mAh 2.6oz (73g) LiPo 2 GPMP3127

GPMP0831 11.1V 1500mAh 3.8oz (107g) LiPo 3 GPMP3127

GPMP0065 9.6V 300mAh 2.4oz (69g) NiMH 8 GPMP3135

GPMP0067 9.6V 350mAh 2.3oz (65g) NiMH 8 GPMP3135

GPMP0071 8.4V 650mAh 3.9oz (110g) NiMH 7 GPMP3135

GPMP0072 9.6V 650mAh 4.4oz (125g) NiMH 8 GPMP3135

If a battery is arranged in PARALLEL it might be

labeled as (P). Arranging the batteries in parallel

will provide more duration (more capacity).

ElectriFly offers a full line of NiMH and LiPo

batteries. Airplanes that use the Ammo 20mm

motors will typically use batteries with a

capacity of 340mAh to 1500mAh with the

higher capacity batteries delivering more flying

time but also being heavier. Most of the

batteries have connectors that fit the

recommended ESCs. We have also listed the

connector adapters needed when using certain

battery/SS-8 or SS-12 combinations.

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.

GPMQ4953 2mm Collet Type

GPMQ4959 3mm Collet Type

ElectriFly Silver Series 8 (SS-8) ESC

(GPMM1800)

for 8A maximum constant current draw.

These ESCs come with 2mm female bullet

connectors that plug directly into the 2mm

male connectors installed on the Ammo

20mm motors, so no soldering is required.

Also, these ESCs come with Micro Deans

batter y connectors that match the connectors

that are found on most batteries they will use.

™

ElectriFly Silver Series 12 (SS-12) ESC

(GPMM1810)

for 12A maximum constant current draw.

GPMQ4620 3mm Prop Saver

(Included with Gearbox)

Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM Page 1

Summary of content (6 pages)

PAGE 1
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM Page 1 ELECTRONIC SPEED CONTROL (ESC) MOTORS ™ by Great Planes® ™ AMMO 20mm POWER SYSTEM An ESC is basically the device that controls your motor through your radio system. Never run any Ammo 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 two Silver Series Brushless ESCs that will work with the Ammo 20mm motors. Model Stock # 20-30-2650 ...............
PAGE 2
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM Page 1 ELECTRONIC SPEED CONTROL (ESC) MOTORS ™ by Great Planes® ™ AMMO 20mm POWER SYSTEM An ESC is basically the device that controls your motor through your radio system. Never run any Ammo 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 two Silver Series Brushless ESCs that will work with the Ammo 20mm motors. Model Stock # 20-30-2650 ...............
PAGE 3
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM Page 1 ELECTRONIC SPEED CONTROL (ESC) MOTORS ™ by Great Planes® ™ AMMO 20mm POWER SYSTEM An ESC is basically the device that controls your motor through your radio system. Never run any Ammo 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 two Silver Series Brushless ESCs that will work with the Ammo 20mm motors. Model Stock # 20-30-2650 ...............
PAGE 4
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM DETERMINE WHAT YOU NEED TO BUILD YOUR POWER SYSTEM Now that you have a component for your power system, there are several different ways to select the rest of the components of your power system. 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.
PAGE 5
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM DETERMINE WHAT YOU NEED TO BUILD YOUR POWER SYSTEM Now that you have a component for your power system, there are several different ways to select the rest of the components of your power system. 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.
PAGE 6
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM DETERMINE WHAT YOU NEED TO BUILD YOUR POWER SYSTEM Now that you have a component for your power system, there are several different ways to select the rest of the components of your power system. 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.