I'm curious if the open fan concept really does have any promise. Of course old implementations like the Russian Tupulov bombers are a perfect example of the noise created by the tip vortices of propellers spinning near or beyond supersonic speeds that is avoided by ducting in the conventional high bypass turbofan design. Toroidal propellers would also address this problem but are too heavy to be practical .
It's so obvious that the author of this video is not well informed and is not an aeronautical engineer. He refers to a program to re-engine the B-52 bomber with four big engines in place of the eight smaller old engines. The decision has been taken already several months ago to replace the eight old engines of the B-52H with eight new small Rolls-Royce engines. That program is well under way. Also the idea of having a Boeing 747 with onlyt wo big engines is not feasible from an engineering standpoint. The large engine for a "Twin Boeing 747" would need to have three times the thrust of the engine that powers now the Boeing 747-8, that is the GEnx at 66,500 lbf (296 kN), which would be 199,500 lbf (888 kN). It's not so that you need twice the thrust per engine to go from a four-engine configuration to a two-engine configuration (assuming the same take-off mass and the same wing). A four-engine aircraft has to demonstrate a safe climb gradient at max take-off weight on three engines. (one engine out). For that case the aircraft needs all the thrust of the remaining three engines to climb. Therefore for a two-engine variant of the same aircraft you need engines that have the thrust to assure a safe minimum climb performance on one engine - and that engine needs the thrust of three of the four engines of the old four-engine variant. So there is no engine in the 199,500 lbf (888 kN) thrust range on the horizon. So forget about dreaming of a twin-engine 747.
This is probably only good news coming out of our country at this time, we have a clown government and with what they are doing to the economy hopefully it won't affect Rolls Royce and destroy their good work by taxing them into history.
I'm curious if the open fan concept really does have any promise. Of course old implementations like the Russian Tupulov bombers are a perfect example of the noise created by the tip vortices of propellers spinning near or beyond supersonic speeds that is avoided by ducting in the conventional high bypass turbofan design. Toroidal propellers would also address this problem but are too heavy to be practical .
bro liked his own comment 🤣🤣
@@RivalsContentCreator waaaait, i can like my own comments/replies?? 🤯
@@dadabetic ya lol
Realiability, ease of service & cost will be the key; Just ask Pratt & Whitney ?
It's so obvious that the author of this video is not well informed and is not an aeronautical engineer. He refers to a program to re-engine the B-52 bomber with four big engines in place of the eight smaller old engines. The decision has been taken already several months ago to replace the eight old engines of the B-52H with eight new small Rolls-Royce engines. That program is well under way. Also the idea of having a Boeing 747 with onlyt wo big engines is not feasible from an engineering standpoint. The large engine for a "Twin Boeing 747" would need to have three times the thrust of the engine that powers now the Boeing 747-8, that is the GEnx at 66,500 lbf (296 kN), which would be 199,500 lbf (888 kN). It's not so that you need twice the thrust per engine to go from a four-engine configuration to a two-engine configuration (assuming the same take-off mass and the same wing). A four-engine aircraft has to demonstrate a safe climb gradient at max take-off weight on three engines. (one engine out). For that case the aircraft needs all the thrust of the remaining three engines to climb. Therefore for a two-engine variant of the same aircraft you need engines that have the thrust to assure a safe minimum climb performance on one engine - and that engine needs the thrust of three of the four engines of the old four-engine variant. So there is no engine in the 199,500 lbf (888 kN) thrust range on the horizon. So forget about dreaming of a twin-engine 747.
Old news.
This is probably only good news coming out of our country at this time, we have a clown government and with what they are doing to the economy hopefully it won't affect Rolls Royce and destroy their good work by taxing them into history.