Most interesting! Impressive how the engineers managed to squeeze that much power at only 1400 rpm. Or did it have a reduction drive? I don't think so, seeing the low position of the prop. The more curious that only a two-bladed prop is used, I should think more blades would be more efficient at such low speeds.
That giant engine must be incredibly heavy, though, especially with the liquid cooling. Any estimate of the weights (max gross, engine alone, empty, ...) ?
Curious too that they choose to use electricity for heating the pilot's suit, when there was ample heat available from the engine cooling liquid. Perhaps they were afraid of leakage from enemy fire, or of broiling the pilot like a lobster if anything went wrong? Yet at the time, electricity must have been a rare medium, and difficult to handle reliably.