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I too, read and loved this book years ago when it came out in paperback. From this trailer I get an almost Blade Runner meets The Expanse *quality vibe.

I watch very few movies. I may have seen ten movies from last year. Of those few i would recommend seeing The Big Sick and Blade Runner 2049. Those were both excellent.

Great year for movies. Loved Dunkirk and Baby Driver. Also loved the new Blade Runner but it doesn't surprise me when it is missing from people's top 10.

Counter-rotating propellers sparked my curiosity when I first saw them on a British Seafire Mk46 at a flight show in the early nineties.

So my amateur's answer would be that it's about the problem of turning the engine's power into thrust. With increasing power, you can either increase the propeller's RPM or its area. So you either a) spin it faster, b) increase its diameter, c) use a more favourable blade geometry, d) add more blades.

a) and b) both lead to blade tips moving faster, and once they approach the speed of sound, wave drag sets in and ruins your day. b) also runs into issues in terms of ground clearance. Thus the Kim Jong-un blades on planes like the An-70: short and fat.

c) is rather difficult to do in terms of manufacture -- that's why more pronounced blade shapes are a relatively recent development.

d) on a single propeller decreases the efficiency of each blade as it passes through the previous blade's vortex. That's why, for instance, German planes in WW2 almost exclusively relied on 3-bladed propellers with increasing blade size, whereas Supermarine went to four and even 5 blades rather quickly. You can work the issue to a certain degree by modifying the blade geometry, thus the 8 blade props on a modern A400M.

Adding more blades by adding another propeller gets around d), although the aft prop still loses efficiency compared to the front prop. On the other hand, counter-rotating props massively reduces problems with torque, which can be rather horrendous for single engine prop planes. The Bf 109, for instance, is (in)famous for being difficult during take-off as it pulls to the side quite violently.

This is, in fact, rather common. If you take a look at fencing manuals (Talhofer and the like). Please remember that the blade was not razor-sharp because it was supposed to work against mail and plate.

I don't know, but I've seen it before in other demonstrations or illustrations so they must have had good gloves . I figure that the blade was probably only kept sharp at the tip.

from wiki on the ineffectiveness of cutting slashes against full plate:
"To overcome this problem, swords began to be used primarily for thrusting. The weapon was used in the half-sword, with one or both hands on the blade. This increased the accuracy and strength of thrusts and provided more leverage for Ringen am Schwert or "wrestling at/with the sword". This technique combines the use of the sword with wrestling, providing opportunities to trip, disarm, break, or throw an opponent and place them in a less offensively and defensively capable position. During half-swording, the entirety of the sword works as a weapon, including the pommel and crossguard. One example how a sword can be used this way is to thrust the tip of the crossguard at the opponent's head right after parrying a stroke. Another technique would be the Mordstreich (lit. "murder stroke"), where the weapon is held by the blade (hilt, pommel and crossguard serving as an improvised hammer head) and swung, taking advantage of the balance being close to the hilt to increase the concussive effect."

I don't know much about HEMA, but why would you have a guard that requires you to hold the blade?

I can understand it on a single-edged blade but on a double-edged sword?

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This video has been seconded as a duplicate; transferring votes to the original video and killing this dupe - dupeof seconded with isdupe by ant.

This video has been nominated as a duplicate of this video by eric3579. If this nomination is seconded with *isdupe, the video will be killed and its votes transferred to the original.

*dupeof=https://videosift.com/video/Blade-Runner-2036-Nexus-Dawn