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Pegasus R-9/2800-200 Operating, Maintance And Safety Manual

4-cycle model engines
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4-CYCLE MODEL ENGINES
R-9/2800-200
AUTHENTIC SCALE MARK I SERIES
SCALE 9 CYLINDER (200 CC) RADIAL ENGINE
OPERATING, MAINTANCE AND SAFETY MANUAL
VOLUME 1 REVISION 4

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  • Page 1 4-CYCLE MODEL ENGINES R-9/2800-200 AUTHENTIC SCALE MARK I SERIES SCALE 9 CYLINDER (200 CC) RADIAL ENGINE OPERATING, MAINTANCE AND SAFETY MANUAL VOLUME 1 REVISION 4...
  • Page 2 Whitney R2800 TWIN WASP radial engine. The engine is a total of 200cc in 9 cylinders and is 1/5 scale. All PEGASUS AIRCRAFT ENGINES are CNC machined from high quality, alloy bar stocks and have unsurpassed fit and finish. Unlike other engines offered on the market today, the PEGASUS...
  • Page 3 WARNING this miniature engine is not a toy but rather a power source for the propulsion of an R/C aircraft. It is expressly forbidden to use this engine to power any manned or human carrying aircraft or vehicle. Any misuse, abuse, incorrect handling or crash damage can cause the engine to malfunction.
  • Page 4 RIGGING YOUR ENGINE FUEL SYSTEM: To rig your R9 engine for fuel, first you will need a 32 to 50 ounce fuel tank. The fuel tank must be adapted to use gasoline. Your local hobby dealer can sell you the necessary parts to accomplish this.
  • Page 5 Place #1 spark plug wire on #1 cylinder’s spark plug and #2 spark plug wire on #2 cylinder’s spark plug (just to the right of #1 when looking at the front of the engine). Continue this progression until you have all spark plug wires installed. Install the grounding leads that are sleeved to the spark plug wires by first attaching the lead to the upper most screw on the intake tube’s brass retainer ring.
  • Page 6 ENGINE COMPONENT RIGGING SCHEMATIC The above schematic is a suggested way to rig the components of your engine. It is situated to use a single battery (not to exceed 8.4 volts) for both the CDI ignition and the fuel pump. Separate batteries can be used for the CDI ignition and the fuel pump if you choose.
  • Page 7 Our test engines usually start with one flip of the propeller blade. OPERATING AND TUNING Operating and tuning your PEGASUS AIRCRAFT ENGINES radial engine is not difficult but requires attention to carburetor tuning, propeller choice, periodic valve adjustment & lubrication, correct...
  • Page 8 The elevation of your location is important to properly tuning your carburetor. The elevation of the PEGASUS TECHNOLOGY factory is 188’ above sea level. You can find out the elevation of your area by calling your local airport.
  • Page 9 To properly adjust the engine after a break-in period of at least 1 US gallon of fuel, bring the engine to full throttle. Using a tachometer, lean the engine (using the high speed needle) until it turns its highest RPM (never more than 4200 RPM depending on prop selection).

  • Page 10: Fresh Air Intake

    running at peak performance. In cold weather the air is denser thus more fuel is needed and in hot weather, the opposite applies. FRESH AIR INTAKE When using an engine cowling, such as in the case of most WWII fighter planes, a fresh air intake must be established on the outside of the fuselage.
  • Page 11 reference number to the parts list. When installing the cylinder hold down screws always use a good grade of RED thread locker. For all other screws use BLUE thread locker. Re-lubricating the rocker arms should be done after every 10 hours of run time.
  • Page 12 To adjust the valves, start by removing the rocker covers and spark plugs from the cylinder heads. While looking through the spark plug hole, rotate the crankshaft until the piston comes to TDC (top dead center) with both rocker arms in the horizontal position (both valves closed).

  • Page 13: Engine Specifications

    Use the same procedure to adjust the other rocker arm. With both rocker arms adjusted, replace the rocker covers. Use blue thread locker on the rocker cover’s screws. The rocker cover’s screws are very small, do not over tighten them. Now proceed to adjust the remaining valves using the same procedure described above.

  • Page 14: Safety Warnings

    SAFETY WARNINGS This model engine is not a toy! It is a sophisticated power system to power model aircraft and should never be used for any other purpose. Keep all loose items away from the propeller when the engine is running. Never reach over the propeller to tune or adjust the engine while the engine is running.

  • Page 15: Exploded Views

    EXPLODED VIEWS...

  • Page 20: Replacement Parts List

    REPLACEMENT PARTS LIST Parts numbers are for 1 each or 1 set as noted. For current prices go to www.pegasusengine.com or call 1-888-898-7841. ITEM QTY. PART PART NAME NUMBER NUMBER AS-21-901 CRANK SHAFT AS-21-902 CRANKSHAFT SLEEVE AS-21-903 NOSE CONE AS-21-904 SCALE MAGNETO AS-21-905 SCALE DISTRIBUTOR...
  • Page 21 ITEM QTY. PART PART NAME NUMBER NUMBER AS-21-C06 CRANKSHAFT KEY AS-21-C11 CAM IDLER GEAR SPACE AS-21-C12 CYLINDER SLEEVE AS-21-C13 10MM STUD, NOSE, SCALE MAG, DISTRIB AS-21-C15 STUD, NOSE CONE 31MM AS-21-C16A EXHAUST PUSH ROD 72MM AS-21-C16B INTAKE PUSH ROD AS-21-C17A EXHAUST GUIDE TUBE 65MM AS-21-C17B INTAKE GUIDE TUBE 64MM AS-21-C18 PUSH ROD TUBE SCALE NUT...
  • Page 22 ITEM QTY. PART PART NAME NUMBER NUMBER AS-21-C67 CYLINDER SCALE OIL PIPE AS-21-P001 SEALED BALL BEARING 17X35X10 AS-21-P002 BALL BEARING, 20X37X9 AS-21-P003 MASTER ROD BEARING, 15X21X16 AS-21-P004 ROCKER BEARING, 4X7X3 AS-21-P006 LOWER ROD BUSHING, 6X8X10 AS-21-P007 M2 X6, CYLINDER AS-21-P008 M2 X 5MM SCREWS, ROCKER COVER AND SCALE OIL PUMP AS-21-P009...
  • Page 23 ITEM QTY. PART PART NAME NUMBER NUMBER AS-21-P030 O RING 4.00 OD X .75 CS, CAM FOLLOWER AS-21-P032 MAGNET 3 X 3, USE SOUTH POLE AS-21-P033 CDI IGNITION KIT FOR ¼ X 32 SPARK PLUG AS-21-P035 CARB AS-21-P037 M3 X 25 FAN BOLT AS-21-P039 M2.5 X 5MM SCREWS, MASTER ROD RETAINING PLATE...
  • Page 24 ADJUSTABLE PITCH PROPELLERS MOUNTING THE ADJUSTABLE PROPELLER HUB: To remove the 2 blade prop hub, use a rubber strap tool (such as used to remove automobile oil filters) to hold the hub while removing the nut from the center of the hub. The nut turns counter clockwise to remove.
  • Page 25 Repeat this operation until the blades have moved to the position you desire. A helicopter pitch gage can be used to check the pitch. At this point, retighten the hub screws and re-install the nose cone. CAUTION: do not over tighten the nose cone as this could cause the threads to seize and make it impossible to remove.

  • Page 26: Warranty

    If the engine fails, runs poorly, produces irregular noise or does not meet specified RPM, you may send it to the factory or a PEGASUS AIRCRAFT ENGINES authorized warranty station for repair. If cause of the deficiency is due to workmanship or materials, it will be repaired at no cost to you except the cost of one way shipping.

  • Page 27: Contact Information

    Any use of oil or oil quantity other than that recommended will void the warranty. PEGASUS AIRCRAFT ENGINES will honor any warranties expressed or implied by venders of the company. The ignition system, carburetor and fuel pump have separate warranties but will be covered by your engine’s warranty.

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