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Wren Turbines 44 TurboProp Installation And Operating Manual

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Copyright Wren Turbines Ltd
September 2008
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Summary of Contents for Wren Turbines 44 TurboProp

  • Page 1 Copyright Wren Turbines Ltd September 2008...

  • Page 2: Table Of Contents

    WREN 44 TurboProp Manual Congratulations on your purchase of the new miniature Wren 44 TurboProp gas turbine engine. This manual has been prepared to help you set up and safely operate your engine. If you encounter any problems then please consult this list first and if you cannot find a solution please get in touch with us. The engine is simple to prepare and use but certain precautions must be observed for your safety and others near you –...

  • Page 3: Introduction

    The Wren 44 Turboprop enjoys the same highly responsive engine as the Wren 44 Gold thrust version so the absolute minimum throttle lag can be appreciated by those keen on prop hanging and the usual aerobatics.

  • Page 4: Weights And Measures

    1710g (3-3/4 lbs) Fuel pump (3oz) Valves (Propane and Fuel) (2-1/4oz) ECU (Engine Control Unit) (1-1/4oz) LiPo battery 7.4v, 1500mAh (2-3/4oz) All up weight 1978g (4lb 5-3/4oz) Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 4...
  • Page 5 An determined look on the face of Lucien Gerard as he taxis out the 2 prototype turboprop in the Top Flight “P51 Mustang” for handling checks, ouside Wren Turbines HQ. Nov 2007 Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 5...
  • Page 6 In the case of the 44 TurboProp the reduction is 9:1 and this gives a propeller shaft speed range of 6,000-9,000rpm. The 2nd turbine has a wide operating rpm...

  • Page 7: Performance

    Almost all aircraft will enjoy an installed power to weight ratio exceeding 1:1 - in many cases Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 7...
  • Page 8 Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 8...
  • Page 9 It is important to stress the unit has been fully tested with all the components supplied with it before it left the factory at Wren Turbines Ltd. There should be no need to make adjustments other than setting the radio to the ecu. Please refrain from jumping in and changing things just because you or a friend have another Wren 44.
  • Page 10 The Mounting The gearbox housing incorporates a Wren Turbines’ innovation – a fully integral mounting system. This specially designed housing answers two of the criticisms of turbo-props – that of their generally awkward mounting arrangement for gearbox and engine, and the amount of heat they generate within the airframe.
  • Page 11 It is identical to the fuel valve in construction. Note – the “F” on the side of the valve base indicates the direction of “Flow” and not “Fuel”. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 11...
  • Page 12 It is good practice to vent the propane tank at the end of the flying session to ensure no propane is left in the system that if seeped out could present a fire hazard. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 12...

  • Page 13: Safety Notes

    – do not touch any part of the engine until it has cooled to room temperature. Always operate your engine in open air away from confined spaces as the engine exhaust contains gases which can cause asphyxiation and nuisance from smells. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 13...
  • Page 14 Please note, the exhaust of a gas turbine has a pleasing smell to enthusiasts of gas turbines but others may find it offensive. Please have consideration for others when running your engine in their proximity. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 14...
  • Page 15 Wren Turbines Ltd, or their appointed agents, after agreement of costs. Before returning the engine or ancillary equipment for service or repair, please contact Wren Turbines Ltd or Wren Service Agent to agree action and costs. When returning an engine please be sure to seal both gas and fuel pipes and pack the pump and engine unit in clean polythene bags to prevent entry of dirt.
  • Page 16 (the propeller). In all cases, follow the propeller manufacturers recommendations for preparation and use. NOTE The maximum speed of the unit with any propeller should not exceed 9,000rpm on the ground. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 16...

  • Page 17: Propeller Selection And Balancing

    If this happened in the air you would not know until it was too late. The warranty will not cover you for such damage. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 17...
  • Page 18 2ltr tank may be a better option. It is sensible to allow for about 25% extra capacity from your requirement to ensure consistent fuel supply. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 18...
  • Page 19 You can see where the engines reputation as being “stingy” with fuel comes from. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 19...
  • Page 20 The air ducting to the inlet of the engine must have a minimum area of 2500sq mm, (4sq” ) equivalent to at least 50mm (2”) square. If an extension to the exhaust ducting is required, it should be approved by Wren Turbines Ltd. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008...
  • Page 21 5% required. All Wren engines can run with 5% oil without harm if you want to keep just one mix for all your engines. All pipe-work used must be of the type supplied by Wren Turbines. Fire Extinguisher Equip yourself with an appropriate fire fighting extinguisher whenever you are planning to run your engine.
  • Page 22 Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 22...
  • Page 23 The chin inlet allows easy passage for cooling air to reach the engine intake by passing under partition. In flight a degree of ram effect may help the engine too! Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 23...
  • Page 24 This keeps the engine protected from dirt getting into the system – but keep everything spotlessly clean anyway. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 24...
  • Page 25 The supply in this case must be gaseous only – no liquid propane. The gaseous supply is then fed directly to the propane valve and the outlet of the propane valve feeds the flow control as before. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 25...
  • Page 26 ECUs connections. NOTE: The wires leading to the pump, glowplug and starter are twisted together in order to reduce interference; do not attempt to untwist them. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 26...
  • Page 27 (Stop) (Stop) (Stop) Move the trim (or switch the “engine cut” switch to on) and throttle stick back to zero and again press the right (+) button. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 27...

  • Page 28: Setting Up The Ecu

    Basic ECU Settings These are the initial settings used in setting up the ECU to the engine. These are then optimised to suit each engine. Do not change the values present in your ecu without referring back to Wren Turbines. Max rpm –...

  • Page 29: Ecu Failsafe Function

    IMPORTANT - ALWAYS PROGRAMME THE FAILSAFE TO SHUT OFF THE ENGINE. NEVER FLY A TURBINE AIRCRAFT WITH THE FAILSAFE SET TO “HOLD”. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 29...
  • Page 30 If there are any doubts about the serviceability of the engine and its accessories following such an incident or accidental crash damage the engine must be examined and serviced by Wren Turbines Ltd or their appointed service agent.
  • Page 31 Go into the 2 screen in the ecu and do a start and watch the battery voltage. If it dips below about 7.2v it needs recharging. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 31...
  • Page 32 Go into “Glow plug power” screen on Glow power insufficient ECU display and increase by 2 points ECU shows “GlowBad” Plug blown Replace plug and check connections Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 32...
  • Page 33 ECU calibrate freshly charged battery deceleration itself Altered pump behaviour as a result of Increase the “Deceleration delay” on the age and/or wear ECU by 5 points Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 33...

  • Page 34: Flying The Unit

    Ideally the response curve should initially rise steeply and then flatten down towards the top end of the range. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 34...

  • Page 35: After Running

    Use a plastic bag rather than a solid plug as it will still allow for expansion in the tank if required. Wren 44 TurboProp Users Manual. Copyright Wren Turbines Ltd February 2008 Page 35...

  • Page 36: Basic Servicing

    It is easily broken if overdone and if not done enough will not work well. If you are not confident to do this you can order a pre-prepared glow plug from Wren Turbines. The element should be teased until the coil is just nicely visible.

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