Huh?
The entire point about HGV is you do not want it to reach higher altitude and get easily detected.
Hypersonic cruise missiles fulfill a totally different need: Anti ship missiles. They are way more manuverable than HGV and NO they do not need to fly straight!
Irrelevant. His posts have too many factual issues.
HGVs
do indeed reach higher altitude compared to HCMs.
HGV typical visualized trajectory and this simplifies it a lot.
HCM can be represented in that visual as the "a) Steady glide" if it is a large rocket booster HCM that imparts more energy for the HCM.
A Zircon HCM would use a much more "steady" type of trajectory, rather than diving down only after it exits atmosphere or reaches close to Karmon line.
We can see Russian Zircon launches on video. It is not a large rocket booster but a small one to deliver it to speed. The rocket booster on those ship launched Zircons do not deliver the second stage vehicle to outside atmosphere or even that close to Karmon line. It would be similar to this example below.
Irrelevant. His posts have too many factual issues.
I did not comment on Avangard's speed being over mach 20. That is what the Russians have claimed. Let me know what my factual errors are.
If you are referring to your claim that scramjet powered hypersonic is "superior" to glider hypersonic, well 1. I didn't make that claim. I didn't even make the claim that gliders are superior. I said they are different and have different challenges. China has both engine powered hypersonics and glider hypersonics.
If you are referring to Avangard, well the only thing I said about Avangard is that it is supposedly a glider (like DF-17 is a glider, like ARRW is a glider). There are many different types of gliders too I'm sure. Just like there are delta wing fighters, diamond wing fighters but all are fighters.
If you are referring to Chinese circumnavigation hypersonic flight being mach 20, I said that was the average speed by the calculation that the most reputable sources on the observation of that flight say it flew 40,000km in just over 100 minutes. That's an average speed of roughly mach 20. That means its maximum speed is certainly well over mach 20 since it would have been well below mach 20 in much of its boost time and as it runs out of energy gradually as it trades potential energy for kinetic energy. We (both of us and probably everyone reading) have no idea on the details of glider dynamics. Therefore we don't know the nature of how they "lose" energy or how they "ride" hypersonic shockwaves.