AeroTwin
Engine Specifications:
General Specifications:
65 HP @ 4200 RPM
Weight: Less than 95 lbs "Ready to Run"
(Includes cooling shroud, exhaust and oil reservoir)
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
Gear Reduction Box: 18.5lbs (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:
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 ... Titanium (Ti 6AL 4V)
Connecting Rod Crankpin dia ... 50.8mm
Crankshaft Material ... Titanium (Ti 6AL 4V)
Crankshaft Main Bearing dia ... 58.42mm
Crankshaft Number of Bearings ... 3
Gear
Reduction Box Ratios:
------ 22x47 =2.136
------ 23x46 =2.000
------ 24x45 =1.875
------ Thus for a 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 Oring, so there are no gasketing issues to contend with.
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