Last update 15 May 2011
TJ-100 Engine Frequently asked questions:
Q: What is the PBS TJ-100 engine off of?
A: It isn't really 'off of' anything. PBS has a long history of turbine machinery design. The TJ-100 turbine (jet) engine is based on the APU designs built for aircraft and helicopters. Some parts of this engine have been in production for years. PBS recognized a market for a small thrust (not turboshaft) engine for use in UAV's and light manned aircraft. Their engineers designed the TJ-100 for these markets. The engine is in current production, and is composed of new components.
Q: What is the thrust of the TJ-100 engine?
A: Maximum static thrust is between 225 and 247 pounds (1000 - 1100 N), depending on the particular version and configuration of the exhaust, intake and engine controller programming. Continuous thrust is approximately 70% of maximum. More thrust may be available for specific applicaions, but engine life will be reduced.
Q: What is the weight of the TJ-100 engine?
A: The TJ-100 engine weighs approximately 42 pounds (19 kg), including the integral engine controller & fuel and oil pumps. Weight will vary slightly depending on configuration and accessories.
Q: What is the fuel burn rate of the TJ-100 engine?
A: The TJ-100 engine has a specific fuel consumption of 1.09 lbm/lbf/hr at near maximum thrust. This equates to approximately 40 gallons/hr at 247 pounds thrust. Click here for the performance chart. (Use your browser's 'back' button to return to this page.)
Q: What is the time between overhauls (TBO) of the TJ-100 engine?
A: The TJ-100 engine has a TBO of 100 - 300 hours, depending on application. PBS has been very conservative with this number. Longer TBO are expected as more field experience is gained.
Q: What is the cost of the TJ-100 engine?
A: As of this writing, the cost is approximately 44,000 Euros. The cost will vary somewhat depending upon exchange rate, engine & exhaust configuration and accessories. Click here for the current US Dollar/Euro exchange rate
Q: What is the starting procedure of the TJ-100 engine?
A: The TJ-100 utilized a full digital controller for starting and running. The start sequence is initiated by simply placing the thrust lever in the 'run' position. All start functions are monitored and controlled by the digital controller. Shutdown is accomplished by placing the thrust lever in the 'stop' positon. A small spring detent prevents accidental start or stop.
Q: Can the thrust of the TJ-100 engine be controlled?
A: Yes. A simple electronic thrust lever (also used for starting and shutdown) controls thrust.
Q: Isn't this just a big R/C model engine?
A: Not at all. The core of the TJ-100 is based on long-produced APU designs developed for manned aircraft and helicopters. PBS designed the TJ-100 from aircraft grade components. It is a 'real' turbine engine with recirculating oil system (no fuel/oil mixing), direct fuel start (not propane start) and a spark igniter (not a glow plug). It is DO-160 compliant.
Q: I've seen websites showing bigger (or cheaper) engines. Why aren't you using these?
A: The internet is loaded with sites showing various jet engines. Many of these are garage projects, and are a far cry from being ready for service in a real aircraft. Some are only mockups cleverly photographed and advertised as "available soon". Some are aftermarket APU conversions, and are much too big and heavy for a sailplane. Some are just too small for use on full-size aircraft. Some manufacturers refuse to support the use of their engines in manned aircraft. As of this writing, the PBS TJ-100 is the most powerful, reliable micro turbine available.
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