VMAX VMX-42PRO, VMX-46PRO, VMX-52PRO Owner's Manual
Model engines, model engine fuel, propellers, spinners and products such as this VMAX model engine can be hazardous
if improperly installed or improperly used. Be cautious and follow all safety recommendations when using your VMAX
model engine and any third party accessories. Keep hands, tools, clothing and all foreign objects well clear of engines
when they are operating. Wear safety glasses when starting or operating this engine. Take particular care to safeguard
and protect your eyes and fingers and the eyes and fingers of other persons who may be nearby. Use only a good quality
propeller that has no cracks or flaws. Stay well clear of the propeller and stay clear of the plane of rotation defined by the
propeller. Keep spectators and small children back at least 10 metres (33) feet at all times when operating the engine.
The manufacturer, distributor, retailer and/or other suppliers of this product expressly disclaim any warranties or represen-
tations, either expressed or implied, including but not limited to implied warranties of fitness for any purpose.
In no event will the manufacturer, distributor, retailer and/or other suppliers of this product have any obligation arising
from contract or tort, or for loss of revenue or profit, or for indirect, special, incidental, consequential or other damages
arising from the use of this product.
In purchasing and/or using this product, the user accepts all responsibility for its use and accepts all liability associated
with such use.
LIABILITY DISCLAIMER
It is important that the following liability disclaimer be
READ BEFORE INSTALLING OR USING THIS PRODUCT
Proceeding with Installation and/or Use of this product indicates
Agreement With and Acceptance of the Liability Disclaimer.
CAUTION
A model engine is not a toy. A model engine functions much like a full size engine. If you do not install and
operate this product properly you can cause injury to yourself and others and damage property.
DO NOT INSTALL OR USE this engine if you are not qualified.
You are solely responsible for the mechanical and operational integrity of this engine and the way in which it
is installed and used. Check all aspects of the installation, the engine, propeller, spinner and all other
accessories attached or associated with this engine before and after each use.
Do not operate the engine unless you are sure that it can be operated safely.
8
OWNERS
MANUAL
.049 5 x 3 5.25 x 4, 5.5 x 4, 6 x 3, 6 x 4 ,7 x 3
.09 7 x 3 7 x 4, 7 x 4.5, 7 x 5
.15 8 x 4 8 x 5, 8 x 6, 9 x 4
.19-.25 9 x 4 8 x 5, 8 x 6, 9 x 5, 9 x 6
.20-.30 9 x 5 9 x 6, 9 x 7, 9.5 x 6, 10 x 5
.35-.36 10 x 4 9 x 6, 9 x 7, 10 x 5, 11 x 4
.40 10 x 5 9 x 8, 10 x 6, 11 x 5
.45-.47 10 x 7 10 x 6, 11 x 5, 11 x 6, 11 x 7 , 12 x 4
.50 11 x 6 10 x 8, 11 x 7 , 12 x 4, 12 x 5
.60-.61 11 x 7 11 x 7.5, 11 x 7.75, 11 x 8, 12 x 6
.70 12 x 6 11 x 8, 12 x 8, 13 x 6, 14 x 4
.78-.80 13 x 6 12 x 8, 14 x 4, 14 x 5
.90-.91 14 x 6 13 x 8, 15 x 6, 16 x 5
1.08 16 x 5 15 x 8, 18 x 5
1.20 16 x 7 16 x 8, 16 x 10, 18 x 5, 18 x 6
1.50 18 x 7 18 x 8, 20 x 6
1.80 18 x 8 18 x 10, 20 x 6, 20 x 8, 22 x 6
2.00 20 x 8 18 x 10, 20 x 6, 20 x 10, 22 x 6
2 STROKE ENGINE PROPELLER SIZES
(Diameter x Pitch in Inches)
Please note that the best propeller size for your engine
may vary considerably with altitude, air temperature, air
humidity, fuel, nitro content and aircraft drag. Experienced flyers and your local hobby retailer may have
suggestions for optimizing performance in your flying
area.
As a general guideline, lower pitch results in more
torque (vertical pull) while higher pitch results in more
speed in level flight.
A crude method of comparing one propeller to another
for level flight performance is to calculate the Power
Factor as (2 x Diameter) + Pitch. The bigger the power
factor the higher the performance the propeller... provided that the engine can handle the corresponding
load. For example an 11 x 7 prop has a power factor of
29 while a 10 x 6 prop has a power factor of 26.
If your engine appears to running overly hot and below
peak RPM you should try a propeller with a lower power
factor.
ENGINE
SIZE
(cu in)
BREAK
IN
AFTER BREAK IN
FUEL TANK POSITIONING
9mm (3/8”)
Centre Line
of Fuel Tank
Recommended fuel tank size by engine displacement.
.10 cu in 60 cc (2 oz)
.19 120 cc (4 oz)
.25 120-180 cc (4-6 oz)
.29-.40 180-240 cc (6-8 oz)
.45-.50 240-300 cc (8-10 oz)
.60 360-420 cc (12-14 oz)
.76 420-480 cc (14-16 oz)
.90 480-600 cc (16-20 oz)
1.20 600-720 cc (20-24 oz)
Using too large a fuel tank can cause wide changes in
RPM as the fuel is consumed, wide changes in RPM
between inverted and upright flight, difficulties maintaining a consistent fuel flow in vertical maneuvers etc.
Using too small a fuel tank will reduce flight times.
As the distance between the vertical position of the
needle valve and the centre line of the tank increases
the following performance characteristics may be
noted...
- more fluctuation in RPM between inverted and upright
flight.
- more fluctuation in RPM between full tank and low
tank due to mixture changes
- more of a need for muffler pressure to smooth out
RPM fluctuations noted above.
- harder starting, more need for primer to start when
engine is upright
- more of a tendency for flooding, fuel siphoning from
tank into engine and hydraulic lock when engine is
inverted.
FUEL TANK SIZE
VMAX is a Trademark of VMAR Manufacturing Inc. and authorized VMAX agents worldwide.
Copyright Richmond RC Supply Ltd 2002. email: vmax@richmondrc.com
www.richmondrc.com
ENGINE
TANK
SAFETY FIRST AT ALL TIMES
SAFETY INSTRUCTIONS
1) Use safety glasses when starting and operating your
engine.
2) Do not operate the engine near loose gravel, sand, small
particles or other debris. The rotation of the engine and
propeller can throw loose material into your face and eyes
and injure spectators.
SAFETY INSTRUCTIONS continued
3) Do not allow loose clothing such as shirt sleeves, ties or
scarves to come into contact with the engine, propellor,
spinner, crankshaft or other rotating or moving items attached
to the engine.
4) Remove all loose items from your shirt pockets, hat or
elsewhere so that they do not fall into the area near the
engine.
5) Make sure the glow plug ignitor, glow plug clip, glow plug
cord, starter cord, fuel line and other objects are well clear of
the propeller, spinner, crankshaft or other rotating or moving
items attached to the engine.
6) If you use a spinner make sure that the edges of the spinner
do not touch the propeller itself to prevent propeller failure and
injury caused by flying propeller blades.
7) Read the WARNING LABELS on fuel containers. FUEL IS
HAZARDOUS. Keep engine fuels in a safe place away from
children, sparks, heat or anything that could ignite the fuel. Do
not smoke near fuel or when fueling or operating your engine.
8) Operate your engine only in WELL VENTILATED AREAS.
Do not operate your engnine in a garage or other building.
Model engine exhaust contains carbon monoxide. Carbon
monoxide is toxic and should not be breathed.
9) Read the WARNING LABELS on propellers. Do not use a
propeller that has any nicks, scratches, splits, cracks or any
sign of wear or damage. Never alter or repair a propeller.
10) Use only a good quality propeller that has no cracks or
flaws. Stay well clear of the propeller and stay clear of the
plane of rotation defined by the propeller.
11) Keep hands, tools, clothing and all foreign objects well
clear of engines when they are operating. Take particular care
to safeguard and protect your eyes and fingers and the eyes
and fingers of other persons who may be nearby.
12) Keep spectators and small children back at least 10
metres (33 feet) at all times when operating the engine.
13) Use a “chicken stick” or electric starter for cranking the
engine.
14) Make all engine and carburetor adjustments while you are
behind the engine. Do not attempt to reach over a rotating
propeller or crankshaft.
15) Do not throw anything into a running engine to stop it. To
stop the engine, cut off the air supply by closing the carburetor
or cut off the fuel supply by pinching the fuel line leading to the
carburetor.
16) Be particularly cautious when moving or carrying your
model with the engine running. Make sure the propeller is well
away from you and others.
17) Do not operate the engine near electric power lines, wires,
antennas, highways or other hazardous areas.
18) Model engines become hot when running. Do not touch
any part of the engine when hot.
WHAT YOU WILL NEED TO OPERATE THIS ENGINE
To start your engine, you will need the following tools and
accessories.
- Glow fuel
- Fuel pump
- Fuel tubing
- Glow plug
- Glow plug wrench
- Glow plug battery with cord and clip, or
- Glow plug ignitor with built in battery
- Propeller
- Propeller wrench
- Chicken Stick, or
- Electric Starter with battery.
Particular attention should be paid to the following.
1) Glow fuel: Use only good commercial glow fuel containing
zero to ten percent nitro methane and 18-20% oil content
being a blend of castor oil and synthetic oil or all castor oil. Do
not operate this engine on home made fuel or with fuel having
less than 18% oil content or with fuel having synthetic oil only.
2) Glow plug: Use a medium to hot R/C long glow plug.
3) Propeller: Wooden propellers are preferred. If a spinner is
used, make sure the spinner is securely attached and that the
edges of the spinner do not touch the propeller. Ensure the
propeller and spinner are balanced. An unbalanced propeller
or spinner can cause damage to your engine and make it very
difficult to adjust the engine for reliable operation.
4) Glow plug battery or ignitor. Select a voltage (usually 1.5
or 2.0 volts) and capacity to ensure that the glow plug you
have selected will glow a bright orange for at least five
minutes.
Operating any model engine requires skill and continuous
safety precautions and considerations. This engine and the
model into which it is installed can develop a great deal of
power and speed. This power and speed can seriously
injure you and other people and do substantial damage to
property. If you are a beginner, be sure to get training from
someone who has experience in the safe installation and
operation of model engines before you attempt to install or
use this engine. Regardless of your experience level, we
recommend having a third party double check your
installation before operating this engine. You are solely
responsible for the mechanical and operational
integrity of this engine and the way in which it is
installed and used.
2
7
VXR-461010 CYLINDER HEAD - 46PRO [w/GASKET]
VXR-461033 PISTON PIN - 46PRO
VXR-461035 PISTON PIN RETAINER - 42PRO,46PRO,52PRO
VXR-461036 CYLINDER & PISTON - 46PRO
VXR-461036S CYLINDER, PISTON, CONROD & PIN SET - 46PRO
VXR-461040 CONNECTING ROD - 42PRO,46PRO,52PRO
VXR-462040 CRANKCASE COVER (BACKPLATE) - 42PRO,46PRO,52PRO
VXR-462050 CRANKSHAFT - 42PR0,46PRO,52PRO - 1/4x28 NF THREAD
VXR-462053 BEARING REAR ONLY FOR CRANKSHFT 42PRO,46PRO,52PRO
VXR-462055 BEARING FRONT ONLY FOR CRANKSHFT 42PRO,46PRO,52PRO
VXR-462060 CRANKCASE - 46PRO
VXR-462060S CRANKCASE WITH BEARINGS - 46PRO
VXR-462070 DRIVE WASHER & CONE - 42PRO,46PRO,52PRO
VXR-462080 PROP WASHER & NUT - 42PRO,46PRO,52PRO
VXR-462090 CARB RETAINER BOLT & NUT - 42PRO,46PRO,52PRO
VXR-463000 CARBURETOR COMPLETE (w/NVALVE) - 42PRO,46PRO,52PRO
VXR-463010 NEEDLE VALVE SET - 42PRO,46PRO,52PRO
VXR-463011 NEEDLE VALVE ONLY - 42PRO,46PRO,52PRO
VXR-463014 NEEDLE VALVE RATCHET SPRING - 42PRO,46PRO,52PRO
VXR-463015 NEEDLE VALVE HOLDER & GASKET - 42PRO,46PRO,52PRO
VXR-463020 CARBURETOR BODY & SPRAY BAR - 42PRO,46PRO,52PRO
VXR-463030 ROTOR SPRING - 42PRO,46PRO,52PRO
VXR-463040 CARBURETOR ROTOR - 42PRO,46PRO,52PRO
VXR-463050 THROTTLE ARM (LEVER) - 42PRO,46PRO,52PRO
VXR-463060 IDLE NEEDLE VALVE & O-RING - 42PRO,46PRO,52PRO
VXR-463070 FUEL INLET NIPPLE & GASKET - 42PRO,46PRO,52PRO
VXR-463080 THROTTLE STOP SCREW - 42PRO,46PRO,52PRO
VXR-464000 MUFFLER - 42PRO,46PRO,52PRO
VXR-464020 MUFFLER REAR PORTION ONLY - 42PRO,46PRO,52PRO
VXR-464030 MUFFLER LONG SCREW & NUT - 42PRO,46PRO,52PRO
VXR-465000 SCREW SET (x12 w/MUFFLER BOLTS) 42PRO,46PRO,52PRO
VXR-465030 MUFFLER SCREWS (2) - 42PRO,46PRO,52PRO
VXR-466000 GASKET SET (HEAD & BACKPLATE) - 46PRO
VXR-46400010 MUFFLER SPACER 10MM (25/64") FOR 42PRO,46PRO,52PRO
PARTS COMMON TO VMX-42PRO, 46PRO & 52PRO
PARTS UNIQUE TO VMX-42PRO
PARTS UNIQUE TO VMX-52PRO
VXR-401010 CYLINDER HEAD - 42PRO [w/GASKET]
VXR-401033 PISTON PIN - 42PRO
VXR-401036 CYLINDER & PISTON - 42PRO
VXR-401036S CYLINDER, PISTON, CONROD & PIN SET - 42PRO
VXR-402060 CRANKCASE - 42PRO
VXR-402060S CRANKCASE WITH BEARINGS - 42PRO
VXR-406000 GASKET SET (HEAD & BACKPLATE) - 42PRO
VXR-521010 CYLINDER HEAD - 52PRO [w/GASKET]
VXR-521033 PISTON PIN - 52PRO
VXR-521036 CYLINDER & PISTON - 52PRO
VXR-521036S CYLINDER, PISTON, CONROD & PIN SET - 52PRO
VXR-522060 CRANKCASE - 52PRO
VXR-522060S CRANKCASE WITH BEARINGS - 52PRO
VXR-526000 GASKET SET (HEAD & BACKPLATE) - 52PRO
VMAX ENGINE DIMENSIONS 42PRO, 46PRO, 52PRO
42PRO
46PRO
52PRO
AB
C
DE
F
GHLWt
Lengths shown in mm. (inches=mm/25.4) Wt shown in g (oz=g/28.4)
1/4 x 28
1/4 x 28
1/4 x 28
TBA
TBA
44
44
44
17.5
17.5
17.5
84
84
84
51
51
51
88
88
88
60
60
60
35
35
35
51.3
51.3
51.3
70
70
70
S=Shaft
Thread
520
Ask about the VMAR
Engine Test Stand
#VMA-ETS120
FUEL IS
HAZARDOUS.
Read Cautions
on Container
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