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Related Manuals for Jets Munt Merlin M122NG
Summary of Contents for Jets Munt Merlin M122NG
- Page 1 VT98NG - Merlin M122NG Instruction Manual (Version 1.5/2021) Torrent d’en Puig, 31.08358, Arenys de Munt, BARCELONA,Spain Tel/Fax: +34 93 7950113 www.jets-munt.com E-mail: sales: info@jets-munt.com service: service@jets-munt.com © Copyright 2018, Jets Munt SL. All Rights Reserved...
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Page 2: Please Read
Fax: +34 93 7950113 Legal and Disclaimer The engine design and the contents of this manual are copyright by Jets Munt SL, Arenys de Munt, Barcelona, Spain. All rights reserved. This manual, the pictures and data are property of Jets-Munt and cannot be used or reproduced in any way without written permission from Jets Munt SL. - Page 3 Before returning the engine or ancillary equipment for service of repair, please contact first to your local dealer or Jets Munt central office to agree action and costs. Do not ship before contacting JetsMunt!! Shipping anything from outside the EU without appropriate dicuments will introduce delay and costs at customs.
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Page 4: Safety Notes
7. Damage to the engine where blockages in the fuel system have occurred by unfiltered or contaminated fuel. Jets-Munt Representatives: Check the current dealer list on our web page, www.jets-munt.com Safety Notes Please remember the engine is not a toy and has the potential to cause bodily harm to you and others if misused. -
Page 5: Engine Description
9. Continual failed kerosene starting or excessive priming of the fuel system can cause excess fuel to build up in the engine chamber which can cause flaming on eventual ignition. If fuel excess is suspected the only way to drain the engine is to tip the engine forward and allow the fuel to exit through the fod screen and mop up with a rag. - Page 6 The engine uses a system of direct liquid preheating, ignited by a long life ceramic glow plug situated inside the engine. After the initial preheat the liquid fuel is gradually introduced. The fuel should contain a small percentage of oil and uses part of this fuel to lubricate its two ceramic high speed bearings.
- Page 7 ECU Data Terminal The data terminal plugs into the ECU via the lead supplied. The display can be used for starting and test running. This socket also doubles as digital connection to a computer. The display can be installed permanently on board. This Smart Data terminal includes dedicated screens for radio checking, last shutdown cause and other special turbine operations.
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Page 8: Engine Installation
lengths up to 10 meters, the power looses on power wires (red and black) will increase with length, so thicker cooper section must be used on long lengths. Up to 1 meter, 1mm2 section is OK. If you make your own extension lead, DOUBLE CHECK THE POLARITY. You will damage the electronics inside the engine if polarity is reversed. -
Page 9: Aligning Transmitter With Ecu
mixes and throttle travel settings in the transmitter. Before doing any adjustment on the ecu, check that your transmitter is sending the correct signal by checking the reading of “Pulse” in the data terminal. It should be between 900-1050uS at STOP position, between 1100 and 1300uS at IDLE position and between 1800 and 2200uS at Full Power position. - Page 10 The screen will now change to: Move the trim to low (or switch the “engine cut” switch to On) and throttle stick back to zero and again press the right hand button (+). The display will now change to: Leaving the throttle stick in the minimum position, raise the throttle trim to the full up position or switch “Engine Cut”...
- Page 11 There are many more parameters that can be modified in the ECU, but we have specifically programmed your ecu with the optimum settings, further adjustment should not be required and can only be carried out by Jets Munt SL or your authorized dealer. Preparing the engine for running A suitable platform/table/workbench is now required to clamp the test stand onto.
- Page 12 The kerostart system used on this engine is a reliable and well tested system that produces very smooth and trouble free starts. However, extra care and attention must be paid when starting a kerostart engine. The main difference between gas and kerosene is that in the case of a failed ignition, the gas dissipates quickly on the air and don't keep inside the engine.
- Page 13 First engine runs · Confirm your test stand is securely fixed to a bench or heavy table. Keep your ear defenders within easy reach and a CO2 fire extinguisher handy. VERY IMPORTANT ON KEROSTART ENGINES. Do not use a powder extinguisher, it will damage the engine.
- Page 14 First the internal glow plug will be energized. After 3 seconds, the starter will be powered up to have the rotor turning at slow speed (3000- 5000 RPM). Once the rotor is at correct speed, the pump and solenoid valves will be energized. Few seconds later the kerosene will ignite and the exhaust temperature will begin to increase.
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Page 15: Auto Restart Function
If a problem is detected, first: Move the trim to the low position to abort the sequence. If there is a fire in the engine and the problem is because the starter has failed or the engine is seized (not turning), IMMEDIATELY APPLY THE FIRE EXTINGUISHER through the intake side of the engine, never trough the exhaust. - Page 16 mode does not pose any safety hazard besides the fact that the engine can be started inadvertently if the start procedure is executed in the transmitter after the flight. ·Autorestart: In particular case of a fuel bubble that momentarily stops the combustion, the ecu will detect this condition by monitoring the rpm, temperature and pump power, and then the ecu triggers the auto restart sequence.
- Page 17 Disclaimer: There are no circumstances Jets Munt P/L or any of its Service Agents and employees will accept or be held responsible for any losses or damages the Auto Restart feature causes should the owner operator choose to enable this function.
- Page 18 means approximately ¼ of thrust. On small engines with a high idle to full power rpm ratio, or in a high drag/low power planes, often only the last 1/3 of the throttle stick produce significant thrust, with the low half stick travel being not used. Although that with current digital TX the pilot can modify the throttle curve to suit his needs, three throttle curves have been added to simplify the setup for most of the installations.
- Page 19 bypass installation, will benefit of smaller exhaust diameter and smaller gap, to get the maximum efflux speed. As a general guideline, use an exhaust tube of a diameter equal or larger than the specified in page 5, with a gap between the engine exhaust and beginning of exhaust tube (excluding the bell mouth) of 25mm.
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Page 20: Fuel System
Running: Engine working correctly, pilot have full control of engine power, command received is an intermediate setting between Idle and Full Power. Run-Max: Engine working correctly, pilot have full control of engine power, command received is Full Power Stop: Engine off. Cooling: Starter is operating to cool the engine. -
Page 21: Fuel And Oil
Always use appropriate containers to store fuel. It is advisable to install an anti bubble system to the fuel supply circuit. The simplest one is a felt filter clunk installed into the fuel tank. This helps maintain consistent fuel flow and greatly reduces the possibility of air getting into the suction side of the pump circuit, which could cause stoppages. -
Page 22: Feed Pipes
Feed Pipes All the pipes must be Polyurethane or nylon as provided by Jets Munt or Tygon (like the ones used by gasoline engines). Do not use Tygon on the pressure side of the fuel pump. Silicone tubing must not be used anywhere in the installation as it is dissolved by fuel and oil. -
Page 23: Extra Ecu Functions
Do not change the voltage, please contact to Jets Munt first -Adjust the pump power at startup. The fuel flow during ignition phase must be finely tuned for each engine/pump combination, and this is done at factory during test. -
Page 24: Smart Data Terminal
Smart data terminal...
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