| General > General Technical Chat |
| F35 jet has crashed into the sea...why? |
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| Monkeh:
--- Quote from: wasyoungonce on November 19, 2021, 11:25:16 pm ---The F35 in the Royal navy are the F35B so uses ducted fan for vertical take off....pretty difficult to FOD that but hey...never say never. --- End quote --- Ducted fan driven by the turbofan, which is highly FODable, and there's no way that 15 tonne brick can take off vertically with any form of useful payload up to and including enough fuel to keep a pilot amused for an afternoon. Thrust to weight of 1.04 with a 50% load vs the ~1.3 of a Harrier, which could just about do it as a party trick with a headwind. |
| David Hess:
--- Quote from: Monkeh on November 20, 2021, 02:30:21 am --- --- Quote from: wasyoungonce on November 19, 2021, 11:25:16 pm ---The F35 in the Royal navy are the F35B so uses ducted fan for vertical take off....pretty difficult to FOD that but hey...never say never. --- End quote --- Ducted fan driven by the turbofan, which is highly FODable, and there's no way that 15 tonne brick can take off vertically with any form of useful payload up to and including enough fuel to keep a pilot amused for an afternoon. Thrust to weight of 1.04 with a 50% load vs the ~1.3 of a Harrier, which could just about do it as a party trick with a headwind. --- End quote --- I just checked and the F35 can also use its ducted fan for short takeoff instead of vertical takeoff. |
| Rick Law:
I'm not an expert, but the idea of a "jack of all trades" one plane for all doesn't strike me well. Each branch of the military has their requirements and this one plane has to fill them all. Looks to me like a classic case of "a camel is a horse designed by committee." Besides it not being able to do as good a job as something designed solely for that job, the compromise to make it multi-function likely made the systems more complex and increased the likelihood of failure. |
| Monkeh:
--- Quote from: David Hess on November 20, 2021, 02:50:34 am --- --- Quote from: Monkeh on November 20, 2021, 02:30:21 am --- --- Quote from: wasyoungonce on November 19, 2021, 11:25:16 pm ---The F35 in the Royal navy are the F35B so uses ducted fan for vertical take off....pretty difficult to FOD that but hey...never say never. --- End quote --- Ducted fan driven by the turbofan, which is highly FODable, and there's no way that 15 tonne brick can take off vertically with any form of useful payload up to and including enough fuel to keep a pilot amused for an afternoon. Thrust to weight of 1.04 with a 50% load vs the ~1.3 of a Harrier, which could just about do it as a party trick with a headwind. --- End quote --- I just checked and the F35 can also use its ducted fan for short takeoff instead of vertical takeoff. --- End quote --- Short take-off is the whole idea of it, yes. |
| Gyro:
--- Quote from: Monkeh on November 20, 2021, 02:30:21 am --- --- Quote from: wasyoungonce on November 19, 2021, 11:25:16 pm ---The F35 in the Royal navy are the F35B so uses ducted fan for vertical take off....pretty difficult to FOD that but hey...never say never. --- End quote --- Ducted fan driven by the turbofan, which is highly FODable, and there's no way that 15 tonne brick can take off vertically with any form of useful payload up to and including enough fuel to keep a pilot amused for an afternoon. Thrust to weight of 1.04 with a 50% load vs the ~1.3 of a Harrier, which could just about do it as a party trick with a headwind. --- End quote --- Bring back the good old sea Harrier. It may not have been supersonic, but it's ability to suddenly stop or go backwards mid flight without having to deploy a silly flappy thing on top, was impressive. It confused the hell out of the enemy. |
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