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Robin DR400/140B Supplementary Information

Diesel powered
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See also: Pilot Operating Handbook
1
NOORDZEE VLIEGCLUB OOSTENDE
DIESEL POWERED ROBIN
DR400/140B
Supplementary information
Remark:
This text is for info only, not to be known by heart, but it helps to
understand the Diesel engine. May help you to fall asleep as well.
INFORMATIONS BASED ON SUPPLEMENT PILOT'S OPERATING HANDBOOK
AND SUPPLEMENT AIRPLANE MAINTENANCE MANUAL PUBLISHED BY
THIELERT AIRCRAFT ENGINES GmbH
Met bijzondere dank aan de collega's van de RAAC voor het ter beschikking stellen van de
informatie ( F. Gardin –voorzitter NZVC)
Revision History:
V0.1 Initial text - Luc Sobry
V0.2 Initial editing - Danny Cabooter
V1 Some items in description set in bold to draw attention - Marc Teugels
Various layout changes - Marc Teugels
V2 Syntax and grammar review – Paul Hopff
System descriptions corrected – Paul Hopff
Aanpassingen voor NZVC OO-NZV – Gardin Franky
Versie oktober 07

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  • Page 1 NOORDZEE VLIEGCLUB OOSTENDE DIESEL POWERED ROBIN DR400/140B Supplementary information Remark: This text is for info only, not to be known by heart, but it helps to understand the Diesel engine. May help you to fall asleep as well. INFORMATIONS BASED ON SUPPLEMENT PILOT’S OPERATING HANDBOOK...
  • Page 2 INTRODUCTION The Robin DR400 is originally fitted with a gasoline Textron Lycoming power plant developing 160 BHP at 2700 RPM. It features four horizontally opposed cylinders and is of the normally aspirated, direct drive, air cooled type. The engine, the O-320-D2A, is coupled to a Sensenich two-bladed metal propeller.
  • Page 3 instrument panel. This knob, labelled “ALTERNATE AIR”, should be pulled out if significant airframe icing happens to be encountered during flight. No fuel priming is required for engine start and furthermore, as we will see, there is no mixture control to be taken into consideration. Perhaps the most interesting part is the fact that the required fuel is diesel (DIN EN590), which may be obtained at any car station-service and which is considerably cheaper than the usual aviation...
  • Page 4 One might rightly believe that the basic purpose of the addition of a turbocharger is to allow higher cruising altitudes. With the TAE 121-1 engine, it is only 16500 ft for the Robin 135CDI. So, why a turbocharger? Fact is that many diesel engines perform well without it, but lack somewhat “spirit”.

  • Page 5: The Fuel System

    RPM increases, if you decrease the speed by pitching up, the RPM decreases whereas, with a constant speed propeller, the RPM remains unchanged because the CSU automatically varies the propeller blade angle so as to maintain the RPM unchanged. 2°) As said, with the TAE 125-01 there is no propeller lever available to the pilot. Here, the CSU is a system which has been developed by Thielert Aircraft Engines.
  • Page 6 Fuel temperature limitations According to the “Supplement”, assuming Jet A1 fuel, the minimum permissible fuel temperature in the fuel tank before takeoff is -30°. For diesel, this minimum must be above 0°C. On the other hand, minimum permissible fuel temperature in the tank during flight is -35°...

  • Page 7: Fuel System

    As for the difference between the DI and IDI, here again, both have their own advantages and disadvantages. For instance, amongst other things, the DI tends to produce more noise, more vibrations and more harshness than the IDI. On the other hand, the DI gives way to a lesser fuel consumption than IDI.
  • Page 8 THE ELECTRICAL SYSTEM, THE FADEC & RELATED INSTRUMENTS, ENGINE MASTER SWITCH General The operation of the electrical system is very much the same as prior to the engine retrofit, the most important difference being the addition of the FADEC system. As the operation of the engine depends largely on the proper operation of the FADEC, the important thing to be aware of is that the TAE 125- 1 engine, besides fuel, also needs electrical power to keep it running.
  • Page 9 It is also through the CAN system that the FADEC transmits information to two related instruments, the CED 125 and the AED 125. The indications on these instruments occur through light emitting diodes whose intensity may be adjusted by an adjacent additional rheostat. CED stands for Compact Engine Display.
  • Page 10 fuel injectors in each cylinder, both systems being electrically supplied when the engine master switch is “ON”. The engine starting procedure is extremely simple. With the main battery switched on, the selection of the engine master switch to “ON” causes the glow plugs to heat up, which is indicated by the “GLOW” warning light momentarily illuminating.

  • Page 11: Vacuum System

    c) Assuming that the coolant’s temperature is more than 94°C, the short circuit is completely bypassed and all of the fluid is directed through the large circuit, thus ensuring a maximum coolant temperature of 105°C. Cabin heating and defrosting system Except for the fact that when the cabin heating is operative, windshield defrosting operates as well.

  • Page 12: Weight And Balance

    Remember that diesel and JET FUEL are heavier than AVGAS and they carry more energy per volume. Because the fuel in the Robin series is in an aft location, fuel consumption shifts the CG forward. The DR400/135CDI delivers greater range and, at altitude, greater speed, than AVGASpowered Robin of equivalent sea-level power ratings, for a given volume of fuel.

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