UMS 7-90 cc User Manual
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UMS 7-90 cc User Manual

Gas radial engines
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Technologies Limited
User Manual For
Gas Radial Engines

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Summary of Contents for UMS 7-90 cc

  • Page 1 Technologies Limited User Manual For Gas Radial Engines...
  • Page 2 NOTICE All instructions, warranties and other collateral documents are subject to change at the sole discretion of UMS, Inc. For up-to-date product literature, and click on the support tab for this product. Meaning of Special Language The following terms are used throughout the product literature to indicate various levels...

  • Page 3: Safety Warnings

    Safety Warnings Model engines produce a substantial amount of power, which can create unsafe situations if not used correctly. Always use common sense and observe all safety precautions when operating, handling or performing any procedure involving your engine. Failure to follow safety precautions could result in serious injury and property damage.

  • Page 4: Precautionary Guidelines

    • Never handle model engines, mufers and/or tuned pipes until they have had time to cool. They can become extremely hot when in use. Introduction Thank you for purchasing an UMS radial engine, one of the nest engines in the market place today. UMS is committed to you having a positive experience and a lifetime of great operation with your new engine.

  • Page 5: Needed To Complete

    Engine Specications Engine 7-90 cc Type 4 - Stroke Petrol Displacement 90.0 cc Bore 25.0 mm Stroke 26.0 mm Cylinders 3.5 Kg with Total Weight Ignition Coil RPM Range 1200 - 6000 Petrol with 1:32 Fuel Two Stroke oil Engine Dia & Length 23.0 cm &...
  • Page 6 Note : Install the tank on the centre line of the engine 1. Install the engine on the airframe with Cylinder #1 in the top (12:00) position (Cylinder #1 is above the UMS Engines logo). 2. Use three steel screws (not included) to attach the engine mounting ring to the rewall.
  • Page 7 Installing the Electronic Ignition NOTICE: Always observe proper polarity when connecting the ignition battery to the ignition unit. The ignition unit does not include reverse polarity protection. Ignition unit damage caused by reverse polarity is not covered under warranty. An electronic ignition is included with your engine. The spark plug wires are labeled for each cylinder—ensure the spark plug wires are connected to the correct cylinders.

  • Page 8: Propeller Selection

    Propeller selection is critical for proper engine operation. You can nd recommended propel- lers and operating RPM ranges in the specication chart. UMS radial engines have a lower operating RPM range and greater torque within that range that require more blade pitch and increased in-air pitch speed for your airplane.

  • Page 9: Starting The Engine

    Checking for a Flooded Cylinder Because of the nature of radial engines, it is not uncommon for the lower cylinders to accumulate excess fuel or oil either in storage or during the priming process. Before beginning the starting process be sure to: 1.
  • Page 10 1. Start the engine. 2. Move the throttle stick up until the engine is running at approximately 2,000 rpm. 3. If you are using separate exhaust pipes, use a temperature gun to make sure hot exhaust is exiting all engine cylinders. If you are using a collector ring, use a temperature gun to make sure all the cylinder temperatures are similar and ring smoothly.

  • Page 11: Maintenance

    Maintenance There are a few things you must do to ensure proper operation of your UMS radial engine. 1. Use a high quality gear oil to lubricate the outer parts of the valve train at the beginning of each ying day.
  • Page 12 Radial Valve Adjustment Guidelines 1. Place the engine in a position (on or off your airplane)that allows you easy access to the valves on all the cylinders. 2. Remove the spark plugs from all the cylinders. It is much easier to determine Top Dead Center (TDC) without the compression caused by installed spark plugs.

  • Page 13: Test Report

    Test Report Engine No. Engine CC Temperature ....C Temperature ....C Temperature ....C Thrust : ......Kgs Max. RPM : ......Min. RPM : ......Temperature Temperature Test by : ....dt ......C ....C Temperature Temperature ....
  • Page 14 FIRST CYLINDER Ø6,3X3nos@132pcd...
  • Page 15 Notes...
  • Page 16 “Gopal Bagh”, 1062, Avinashi Road, Coimbatore - 641 018 INDIA. Tel : +91 - 422 - 2243439 (5 Lines) Fax : +91 - 422 - 2242760 E-mail : support@umstech.in Web : www.umstech.in...

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