3 ms·
> At what point does a prop become a fan? Linguistically, a prop becomes a fan when you anchor it to something immovable, or attach it to something movable but
by dmoy 4y ago
> At what point does a prop become a fan?
Linguistically, a prop becomes a fan when you anchor it to something immovable, or attach it to something movable but without any intention of propelling it using the prop.
Fan - try to move the air around, but not the thing it's attached to.
Prop - try to propel the thing it's attached to
Edit: I realize that might sound ambiguous given terms like "turboprop" and "turbofan" both of which are on planes.
The turboprop uses air to speed up propellers to move the plane. A turbofan uses just accelerated exhaust from the engine, and the fans are just a means of feeding the engine combustion material (air)
- buildbot 4y agoI am not sure this is really correct - turbojets (as in fighter jets) sound more like what you describe, turbofans if I remember correctly, get most of the thrust (>70%?) from bypass air around the combustion, and very little from actual combustion thrust. It just also feeds it's own combustion chamber air to keep the fan part going. Perhaps it is a fan if enclosed? Vs. a prop if not?
- imnotreallynew 4y agoMost modern fighter jets have turbofan engines as well.
- justsomehnguy 4y ago>Perhaps it is a fan if enclosed? Vs. a prop if not? Stipa Caproni
- rbanffy 4y agoDear Lord! Half of the lift is due to the repulsion Earth feels from it.
- polishdude20 4y agoThat's not true about a turbofan. A large part of the thrust is actually from the fan itself. The bypass air that never goes into the combustion chamber produces most of the thrust.
- jonsen 4y ago"A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the thrust.": https://en.m.wikipedia.org/wiki/Turbofan https://en.m.wikipedia.org/wiki/Turbofan