Great Planes Ammo 20mm Power System - GPMG5115-5145 - Manual

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 AMMO 20mm PO WER SYSTEM 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 information at a glance. For example: the
20-40-4850kV is 20mm in diameter, 40mm
long and has a kV (rpm-per-volt) of 4850 rpm.
56.2mm
20mm
3 0mm OR 40mm
2.2mm
11. 8 mm
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 draw excessive 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 S tick Mount Gear Drive is designed to fit
the 10mm motor mounting stick that is common
on most of today’s small park flyers.
GEARBOX
An E S C is basically the device that controls
your motor through your radio system. Never
run any Ammo motors with a brushed E
S C. It
will not work and you may damage both the
motor and the E
S C. Always use a brushless
E S C. ElectriFly offers two S ilver S eries
Brushless E S Cs 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
S HC S crew (2)
4. Prop S aver Hub (1)
5. Rubber O-Ring (1)
6. 2.5x4mm Machine
S crew (2)
7. 2.5mm Flat Washer (2)
8. 64 Tooth
S pur Gear (1)
9. 2.5x7mm Machine S crew (2)
The Ammo Motor/ S ilver S eries E S C
combination can use NiMH or LiPo batteries.
Typically, NiMH batteries are heavier but much
more affordable 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 LiPo.This means the cells are connected in
S ERIE S ( S ). Arranging batteries in series gives
you more power (higher voltage).
• Each NiMH cell has 1.2V, so an 8-cell
NiMH battery has 1.2x8 = 9.6V
• Each LiPo battery has 3.7V, so a 3-cell
LiPo battery has 3.7x3 = 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 (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-power electric type props such
as the Great Planes PowerFlow
™ props and
the APC S lo 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.
S hown 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 S tick 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 S et S crew Type
GPMQ6655 .......10x3.5 S PowerFlow
GPMQ6660 .......10x4.5 S PowerFlow
GPMQ6695 .......11x4.5 S PowerFlow
APCQ5000 ..........8x3.8 S F S lo-Flyer
APCQ5010 ..........9x4.7 S F S lo-Flyer
APCQ5015 ........10x4.7 S F S lo-Flyer
APCQ5016 ........10x3.8 S F S lo-Flyer
APCQ5017 ........11x3.8 S F S lo-Flyer
APCQ5020 ........11x4.7 S F S lo-Flyer
APCQ5025 ........11x7 S F S lo-Flyer
APCQ5026 ........12x6 S F S lo-Flyer
APCQ5027 ........12x3.8 S F S lo-Flyer
APCQ5028 ........12x8 S F S lo-Flyer
Battery # of Connector
Stock # 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 E
S Cs. 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.electrifly.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) E S C
(GPMM1800)
for 8A maximum constant current draw.
These E S Cs 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 E
S Cs come with Micro Deans
battery connectors that match the connectors
that are found on most batteries they will use.
™
™
ElectriFly Silver Series 12 ( SS -12) E S C
(GPMM1810)
for 12A maximum constant current draw.
GPMQ4620 3mm Prop S aver
(Included with Gearbox)
Ammo 20mm 4fold.qxd 6/15/2006 11:43 AM Page 1