And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Wednesday, August 20, 2025
Hot exhaust too close to the arms and the fuel supply
Bigger problem: IRL max 60 second thrust time. The fuel tanks should be below the bottom hack mark by that point. He's going to descend from that altitude at terminal velocity, in a power-off glide, in about 2 seconds. Probably upside down, facing the sky, heavy backpack-first. Screaming that last 15 seconds or so. That won't end well, but at least it'll be quick. That's the difference between reality, and sci-fi fantasy illustrations.
The painting looks like a cover for either Popular Science or Popular Mechanics of the era. We were gonna commute via jet belt, no more cars!
Bell actually built one and tested it, nice idea but about 30 minutes endurance and a huge hazard to the pilot in a less than ideal landing. The Williams WR19 engine was a high bypass design so the exhaust was relatively cool, not the heat hazard of the Rocketman's jet pack from the movie...
Got to see a pilot fly one as a young kid, it was our BoyScout Jamboree, Normbega Council, think it might been 65-66, anyway coolest thing I ever seen. It was the hydrogen peroxide rocket type. Had about a minute at best of flight time, all silver foil wrapping the entire rig, barely made a sound just a whisper, went fast as the dickens when they went WOT over us standing in our field watching, big gust of wind come down as they flew past. Back then, well Absolutely Totally Cool In Every Way. Thats after we got to stand side of the runway as F-4' took off full AB by us, those beast shook the ground, so loud it made your body shake.
Maybe it’s just making wind… you know like eating an entire can of baked beans… 🤷🏻♂️
ReplyDeleteBigger problem: IRL max 60 second thrust time. The fuel tanks should be below the bottom hack mark by that point.
ReplyDeleteHe's going to descend from that altitude at terminal velocity, in a power-off glide, in about 2 seconds. Probably upside down, facing the sky, heavy backpack-first.
Screaming that last 15 seconds or so.
That won't end well, but at least it'll be quick.
That's the difference between reality, and sci-fi fantasy illustrations.
The painting looks like a cover for either Popular Science or Popular Mechanics of the era. We were gonna commute via jet belt, no more cars!
ReplyDeleteBell actually built one and tested it, nice idea but about 30 minutes endurance and a huge hazard to the pilot in a less than ideal landing. The Williams WR19 engine was a high bypass design so the exhaust was relatively cool, not the heat hazard of the Rocketman's jet pack from the movie...
https://rocketbelts.americanrocketman.com/jet-pack.html
Got to see a pilot fly one as a young kid, it was our BoyScout Jamboree, Normbega Council, think it might been 65-66, anyway coolest thing I ever seen. It was the hydrogen peroxide rocket type. Had about a minute at best of flight time, all silver foil wrapping the entire rig, barely made a sound just a whisper, went fast as the dickens when they went WOT over us standing in our field watching, big gust of wind come down as they flew past. Back then, well Absolutely Totally Cool In Every Way. Thats after we got to stand side of the runway as F-4' took off full AB by us, those beast shook the ground, so loud it made your body shake.
ReplyDelete