I saw a Concorde take off once (I think it was from Bradly Intl. in Hartford, Conn.), and remember it was beautiful but very loud, even through the sound-deadening glass windows of the air terminal. A college friend worked for a big Wall Street firm in the go-go Eighties and got to fly on the Concorde once for a business trip. She loved it.
Radial engines have a lot of disadvantages. They use a lot of oil, and tend to blow it onto the airplane. They have a large frontal area, so they increase drag and reduce visibility over the nose. They can be operationally difficult to use, because they are more prone to shock cooling and proper engine techniques are more important. Oil can collect in the bottom cylinders leading to hydraulic lock, etc. They can be more complex and as a result they often have low time between overhaul - the Pratt and Whitney R-985 has a TBO between 1000 and 1200 hours, depending on application. A comparable inline engine might have a TBO of 2000-2400 hours.
There are still good uses for radials. Crop dusters like them for the power to weight ratio, and the high frontal drag can be a feature. They can be wasier to work on, and you can blow a cylinder and the engine keeps running just fine. And you can get high power for less weight.
Air-cooled radial engines have quite a few advantages over their inline cousins. They’re lighter than liquid-cooled inline engines and since they don’t rely on coolant, they’re more damage-resistant. Radial engines are simpler - the crankshafts are shorter and they need fewer crankshaft bearings. They’re more reliable and run smoother.
I need to research what was said on the program but I don’t think there is a tradeoff for commuters using turboprops. Lithium batteries are a non-starter but hydrogen fuel cells would be an energy swap with jet fuel. I could have mis-heard what was said but they said the energy density is there.
and we are just a few short years away from some serious personal airplanes. The one most impressive was the design from Joby which is making every piece of the airplane including motors and propellers.
I remain skeptical of electric flight. The only use-case I’ve seen so far that comes close to being realistic is the Harbor Air project with the electric Beavers. They are an island-hopping transport company where most flights are around 15 minutes. That’s a pretty rare use case, but one that actually works for electric power.
Beware scam companies. ‘Green’ solutions are ripe for scams, because we are raining money on people who claim to solve vexing global warming problems, and we’re suckers for ‘disrupting’ designs and fancy CGI marketing. The vast majority of the futuristic electric airplanes we see breathlessly reported in the tech press will never be certified.
And there are always tradeoffs. While hydrogen is similar to kerosene in terms of weight, it needs about four times the volume - and apparently it’s not easy to store in wing tanks. You need something like a 700 bar carbon fiber pressure vessel to hold the hydrogen, which could present its own certification problems. I’d hate to be in a crash with one of those in the fuselage. Then there are problems with hydrogen embrittlement, which will necessitate new inspection regimes before we certify these planes.
I will say hydrogen fuel cells look to be more promising for electric flight than batteries as of today.
That’s pretty much how I see it. I saw some VERY interesting ideas like a hybrid 337 and another plane that used a turbine generator to power the motors.
What I really liked was the concept of using a thin wing for high speed that uses multiple smaller electric motors to create a blown flap arrangement or even a tilt rotor transition. Very easily done.
The first thing I thought when I saw it was, ‘yikes, that thing is short-coupled, and doesn’t have a swept wing. It must be a handful to fly.’ But yeah, it looks super cool. and it could be a really efficient glider with that flying wing. And stealthy. It definitely belongs in a Mission Impossible film.
Please be noted that Reporting of Safety Incident (ROSI), Air Traffic Control (ATC) has been initiated due to the following incident information attached for your immediate action.
WIth a phishing or virus link. Kind of odd, you’d think the proportion of the randomly chosen population for whom this could plausibly be genuine would be tiny. Maybe something like pprune.org got hacked, I can’t remember if I gave them my email.
the German rocket plane ME-163 started out as a glider that morphed into a powered version known as the Lippisch Delta IV. Germany was prevented from developing war planes after WW-I but they could develop gliders.
These aircraft were the progenitors of Delta wing aircraft.
I would check with Google to see if your email address appears in any hacked databases that might be aviation related. Or, someone may have bought a mailing list from a company that tracks online usage and flagged you as a pilot or interested in aviation.