progress on the engine-gearbox unit
After I was yammering so hard about my big mistakes, I was able to solve at least one of them. In fact, I was able to realize the cutout in the monocoque for the oil tank. Even if it demanded all my skills and patience, the current solution is quite good (what means not perfect). After I wasn’t able to get through the rear wall of the monocoque with a hammer and a scalpel (a broken blade), it needed an Aluminium-saw to get it done. I was impressed by myself how extremly hard and resistant the wall/bulkhead was.
With a little help, I also know now, how the oil is cooled. A dedicated engineer of Cummins Turbos enlighted me. As he said, it’s very common in aerospace to cool the oil down by the fuel. That sounds very plausible to me, because the oil tank (at the front of the engine) is more or less surrounded by fuel, only apart by a few milimetres of carbon fibre and a bit rubber from the safety fuel tank. The fuel itself is cooled by radiators which are placed alongside the water radiators. As I wrote in a post before, the fuel has to be cooled down because a part of the compressed fuel from the common rail system flews back into the tank. The compressed fuel has a temperature of about 140°C (Wikipedia).
As you can see on the pictures, there’s a lot of progress at the engine and the gearbox.
I did most of the electrical wiring of the engine. I have to say, that I do not understand the electrical injection valve control system completely. But I interpreted it in a way, that it could work. Next thing to do on the engine is the whole cooling system. Namely water-and fuel cooling and the intercoolers. The big silver pipes, that come out of the monocoque, which transports the “used” air from the cockpit are for cooling some items at the engine and the gearbox. One item is for example the VTG (Variable Turbine Geometry) control unit. That’s the carbon fibre box on top of the turbo charger. There are also some items at the gearbox, but I do not know their role yet. But one of them should be the gearbox oil radiator I guess.
I also finished the whole gearbox casing. The casing itself is quite empty, only the drive shaft and the differential housing is in there. At the gearbox housing itself, I mounted a few suspension items. As for example, brackets, dampers, torsion bars and the anti roll bar.