4 ms·
How so? Is there a sharp gradient in the boundary layer effect that makes it an on/off control system?
by anilakar 3y ago
How so? Is there a sharp gradient in the boundary layer effect that makes it an on/off control system?
- jojobas 3y agoBoeing 747 stabilizer trim is achieved by rotating the entire tailplane by up to 15 degrees. The elevator is much smaller (less than 1/3 the area) and is deflected by a smaller angle. That's some serious force you'd have to apply with those air jets either throughout the cruise phase or takeoff/landing.
- anilakar 3y agoPositioning of nozzles in the video suggests they're experimenting with a BLC system, not just nozzles placed in the extremities like in the Harrier jets.
- tlb 3y agoPassenger jets need it because the center of gravity can vary a lot depending on passenger and cargo loading. A spy plane could probably be built with almost zero variation, with some careful fuel tank management.
- JumpCrisscross 3y agoThere are entire classes of tail-less aircraft. This is an abundantly solved problem.
- jojobas 3y agoHuge control surfaces harsh CoG limitations are the tradeoff.