Tractor Pulling in Waldviertel

We went to the annual tractor pulling event with some friends today. None of us have been before so it was quite an experience. It was a perfect day - sunny, mid-twenties, slight breeze and the predicted thunderstorms held off until we got home. I have copied some passages from wikipedia as an explanation if you are interested and haven't been before. I will put some photos on flickr but not tonight!
Engines[edit]
Apart from modified standard diesel tractors, a variety[5] of high power engines are used in tractor pulling, which started in the late 1970s. In the early years, mainly single, double or multiple US-made big block dragster engines were used, but nowadays, a lot of parts from discarded military machinery are in use, like Klimov TV3-117 (Isotov)[6] turboshafts from Russian helicopters, Soviet Zvezda M503[7] torpedo boat engines, Continental AV1790[8] tank engines, or World-War-2-era aircraft piston engines in V12-shape (e.g. Rolls-Royce Griffon[9]) or as radial engines (e.g. Curtiss-Wright R-3350[10]). Due to the limited number of vintage warbird engines remaining, some organisations that own them, such as the Fantasy of Flight museum in Florida, refuse to sell engines from their collection to customers that wish to use them for tractor pulling.[11] In recent years a number of agricultural engines have been converted to run on methanol with multi-stage turbocharging.
Today there were also Panzer engines and helicopter engines
Sled pulling
Today's sleds use a complex system of gears to move weights up to 65,000 pounds/29,000 kilograms. Upon starting, all the weights are over the sled's rear axles, to give an effective weight of the sled plus zero. As the tractor travels the course, the weights are pushed forward of the sled's axles, pushing the front of the sled into the ground, synthetically creating a gain in weight until the tractor is no longer able to overcome the force of friction.[3] Most sleds have grouser bars that act like teeth and dig into the soil to stop the sled.[4]
The photo is of an invited driver taking off in his tractor with 4 x V8 Hemi, which apparently stands for hemispherical combustion chamber, producing a whopping 10,000 hp. 
The extras show a camera drone which was lurking around all day and the second extra shows one of the diesel engines taking off in a cloud of black smoke.