ROTEC R2800 7-Cylinder Radial Engine

R2800 Specifications

Dry Weight with Acc's (Starter Motor + Alternator + Carb) = 102 Kg (225 lb.s)
Propeller hub is driven via precision ground and matched taper. Propeller flange specs are standard and are the same as used for a Rotax 912 Series.
Gearing is via a PSRU ( Planetary Speed Reduction Unit) at a radio of 3:2 engine rpm:Prod rpm.
The wooden Propeller used for our aircraft is a Fixed 72" Diameter x 56"Pitch.
Fully machined aluminium crankcase and heads. Steel 4140 billet crankshaft, nitride hardened and ground, running on two large anti-friction roller bearings, propeller support and end thrust controlled by single deep groove ball bearing. Steel 4140 master and link rods deeply I bean sectioned and plain bushed, all lubricated by mains oil pressure. Steel 4140 cylinders precision honed to a perfect finish and exact tolerance.

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The all important ignition system utilizes two auto type spark plugs per cylinder independently fired by both a single self-energized magneto and hall-effect 12 volt electronic ignition system, virtually eliminating total ignition failure when used in tandem. Timing is fixed at 25 degrees BTDC.
Electric 12volt started motor (rear mounted) including built-in solenoid for reliable engagement and cranking, 35amp alternator (small and also rear mounted) with built in voltage regulator. Single Bing 40mm constant depression carburetor offering excellent automatic altitude compensating mixture control for an incredibly smooth delivery of power. Fuel supplied by engine driven mechanical fuel pump: an electric fuel pump is installed for back up.
Dry Sump lubrication via geared oil pressure and primary and secondary scavenge pumps. Auto style spin on oil filter are incorporated in the design.
Conventional valve train (two for cylinder) incorporating classic dual row cam rings and roller tappets for smooth valve movement via push rod and 1:1 rocket transmission (all oil pressure lubricated). All camps and bearing surfaces are nitride hardened and precision ground to exact tolerance. Minimum octane 97 RON or 100LL aviation or high octane mogas are recommended. Compression ratio of 8,5:1 is standard.
Fuel consumption: Avgas 100LL or right octane mogas: 22 ltrs/hour (5.8 US gal/hr)@ 80% Power.

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