The Wright Bros achieved 90% efficiency with their propellers. Adding 15% to that gives 103.5% efficiency, which I'm not buying.
No they did not. it was 66%
MT-Propeller 11 blade propeller delivers 15% increase in static thrust
101–104 of 104 posts
Re: MT-Propeller 11 blade propeller delivers 15% increase in static thrust
#102Earlier quoted context omitted.
That makes it a great candidate for near-net casting. That way you save the 80% of tre billet you'd be turning into chips, and your fancy CNC gets more parts per shift.
Alternately, you can do the rough machining on a cheaper 3-axis machine (even outsourcing it).
That’s a good point. Running two CNC machines is a lot easier than running one machine and dealing with a foundry. I mean I’ve only ever dealt with one foundry and they were flaky, and obviously there must be reliable foundries out there, but I don’t like relying on outside shops any more than necessary.
Re: MT-Propeller 11 blade propeller delivers 15% increase in static thrust
#103Earlier quoted context omitted.
> The hilarious thing is that the government investigation called it a "survivable accident" because no one happened to be seated in the row that it shot through. No, that’s not why. See FAA definition below. Survivable Accident - an accident in which the cockpit and/or structure remains relatively intact and the forces experienced by the occupants did not exceed or should not have exceeded the survivable limits of h…
In other words, a survivable accident is approximately an accident in which one or more occupants could have theoretically survived, even if in fact they all died. One or more survivors would seem to prove the accident was survivable.
Since in enough quantities or the lack thereof everything is lethal, where does the threshold land?
I'm sure some people have survived explosions, I know of the one woman who fell out of a plane without a parachute and survived it, so falling off the empire state building is a survivable incident, right?
Re: MT-Propeller 11 blade propeller delivers 15% increase in static thrust
#104Earlier quoted context omitted.
In other words, a survivable accident is approximately an accident in which one or more occupants could have theoretically survived, even if in fact they all died. One or more survivors would seem to prove the accident was survivable.
Since in enough quantities or the lack thereof everything is lethal, where does the threshold land? I'm sure some people have survived explosions, I know of the one woman who fell out of a plane without a parachute and survived it, so falling off the empire state building is a survivable incident, right?
They mention limits on acceleration, etc. I presume there's a standard table somewhere. I'm not sure if they use median survivablility or some higher quantile.