Raptor Diesel GT - Audi 3.0L V6 TDI
The Raptor Diesel GT will be powered by an Audi 3.0L V6 TDI engine. We are presently figuring out the numbers for this engine but it will likely be putting out somewhere between 240 and 310 hp. The torque will be between 420 and 480 lb ft which will no doubt make for a brisk takeoff and climb when mated to the 4 bladed propeller. 

A high speed cruise using about 260hp will get you about 190 kias or 285 ktas burning about 14 gph resulting in about 24mpg. If you throttle back to 150hp you will see about 155 kias or 232 ktas on about 7 gph resulting in about 38mpg. 

I bet you're thinking that it's not possible for an aircraft of this size to get better mileage than most cars. Well, using the lastest in automotive diesel technology and an extremely low drag design that's also able to get up to and cruise at FL250 it makes these numbers possible. Not only that but with a 124 gallon fuel capacity you can fly for 15 hours and and cover over 3500 statute miles. Pretty amazing don't you think? Want to travel to Hawaii or Europe, not a problem, and it wont even break the bank in fuel costs.

The engine will be specifically modified for aviation. It will have a dual kevlar cogged belt driven PSRU to reduce the prop speed to about 2000rpm. It will have a single power lever, full fadec system. The fuel tanks will be heated using excess heat from the engine in order to prevent the diesel fuel from thickening due to the cold temperatures at altitude. If you're running Jet A the heating of the fuel will not generally be required.

Other benefits of this engine are that it burns Jet A or regular diesel, which is cheaper and more readily available than 100LL. 

The engine will also be extremely quiet and smooth and so will the 4 bladed prop turning at low rpms. You will likely not even need a headset when flying the Raptor Diesel GT.

The diesel engine is also much better for the environment and non-pilots will not be able to criticize you for wasting fuel given that you will be using less than they burn on a road trip. 

Here are a few pictures of the Audi 3.0L V6 TDI engine we are evaluating. 
This is Audi's newest variant with a secondary electric turbocharger. We don't really need to eliminate turbo lag but this turbocharger is one that we are considering to provide cabin pressurization.
This pictured variant puts out 272 hp. We will be providing a remapped ECU that will reconfigure the limp mode in order to never restrict the engine by more than 20% power if an error is detected. We will also provide a switchable option in the ECU to run either straight diesel or Jet A. When running Jet A an oil addtive may be required. 
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