AeroTwin
Motors Corporation has developed and is manufacturing and distributing
the new patented AeroTwin Engine designed by Bill White of New Zealand.
It was designed to meet the needs of several markets for a light-weight,
yet powerful, engine in the 50-65 horsepower range.
Unique
Features of the AeroTwin Engine include (both Turbo and Natural Aspirated):
Internal air cooling/oil scavenging system
Reversible cylinder head (swap sides for inlet & exhaust)
Hollowed head studs serve as oil passageways to cam boxes
Can run both vertical and horizontal
Engine Management System
Engine is held together by 6 studs that pass through crankcase
and
also hold down head
All sealing surfaces use O-rings
Internal starter drive uses ring gear as part of crankshaft counterweight
Hollow cam shafts reduce weight
Combustion chamber is ceramic coated
Crankshaft secondary balance is improved by use of light alloys
Bore/stroke relationship is structured to reduce secondary imbalance
without the need for balancing shafts
Output drive is available from both ends of engine
More than
a great product, the AeroTwin Engine is backed by an experienced
Engine Technical Support Team that is ready to assist with any product
support needs or application questions you may have.
General
Specifications for Turbo Charged Engine:
65 HP @ 4200 RPM
Weight: 100 lbs
Dimensions (Height): 17.5"
Two Cylinders, In Line
Dry Sump (Runs in Vertical and Horizontal position)
Air Cooled 972cc 4 Stroke
Firing Angle 360°
Bore: 101.6
Stroke: 60mm
Compression Ratio: 8.0:1
Manifold Pressure: 8 psi
Two Sparkplugs per Cylinder
Two Valves per Cylinder
Belt Driven Twin Camshafts
Electronic Fuel Injection and Ignition
Fuel Octane Requirement: 91UL
Oil Tank Weight: 8lbs
Gear Reduction Box w/ Centrifugal Clutch: 27 lbs (see detail below)
Propellar Flange: standard output flange has 75mm
and 100mm bolt-circle pattern for mounting, an aircraft standard SAE No.2
propeller flange is also available as an option
General
Specifications for Natrually Aspirated Engine:
50 HP @ 4900 RPM
Weight: 90 lbs
Dimensions (Height): 17.5"
Two Cylinders, In Line
Dry Sump (Runs in Vertical and Horizontal position)
Air Cooled 972cc 4 Stroke
Firing Angle 360°
Bore: 101.6
Stroke: 60mm
Compression Ratio: 8.0:1
Two Sparkplugs per Cylinder
Two Valves per Cylinder
Belt Driven Twin Camshafts
Electronic Fuel Injection and Ignition
Fuel Octane Requirement: 91UL
Oil Tank Weight: 8lbs
Gear Reduction Box w/ Centrifugal Clutch: 27 lbs (see detail below)
Propellar Flange: standard output flange has 75mm
and 100mm bolt-circle pattern for mounting, an aircraft standard SAE No.2
propeller flange is also available as an option
Detail
Specifications (both Turbo and Natural Aspirated):
Intake Valve dia ... 46mm / Exhaust ... 40mm
Intake Port dia ... 38mm / Exhaust ... 34mm
Intake Cam lift centre ... 102°
Exhaust Cam lift centre ... 112°
Total lift Inclusive ... 10mm
Included Angle ... 32°
Feature Note: The cylinder head is designed to allow
it to be rotated 180° so that intake and exhaust positions can be
changed.
Piston Type ... Shallow Slipper
Piston Pin dia ... 22mm
Connecting Rod Centres ... 120mm
Connecting Rod Material ... Aluminum
Connecting Rod Crankpin dia ... 50.8mm
Crankshaft Main Bearing dia ... 58.42mm
Crankshaft Number of Bearings ... 3
Gear Reduction Box Ratios:
--22x47 = 2.136
------ 23x46 = 2.000
------ 24x45 = 1.875
------ Prop speed of 2000rpm
------ 2.136 = 4272rpm
------ 2.000 = 4000rpm
------ 1.875 = 3750rpm
------ Prop speed of 2200rpm
------ 2.136 = 4699rpm
------ 2.000 = 4400rpm
------ 1.875 = 4125rpm
------ Prop speed of 2500rpm
------ 2.136 = 5340rpm
------ 2.000 = 5000rpm
------ 1.875 = 4687rpm
Feature Note: The gear centres remain the same for
all ratios, so it's just a gear pair to change from one ratio to another.
All of the bearings have slip fit mounting clearances, as does the drive
shaft, so the system requires no pressing or heating to change a gear
pair. The casing is sealed with one perimeter O-ring, so there are no
gasketing issues to contend with.
AT972
Horsepower Chart:
Horsepower/Torque Chart (PDF format)
Horsepower/Torque Chart : Naturally Aspirated (PDF format)
AT972
Fuel Consumption Charts for Turbo Charged engine:
Fuel Consumption Chart - 70% Throttle (PDF format)
Fuel Consumption
Chart - 85% Throttle (PDF format)
Noise
Levels for Turbo Engine only:
96 decibals @ 2,300 RPM (10'
from exhaust stack - no muffler and some prop noise)
104 decibals @ Full Throttle (10'
from exhaust stack - no muffler and some prop noise) |