2 ms·
How about ground effect for helicopters (or hovercraft)?
by giantg2 3y ago
How about ground effect for helicopters (or hovercraft)?
- HPsquared 3y agoWorks just the same underwater. (Inviscid, incompressible). Low Mach number means compressibility is not significant. High Reynolds number means viscosity is not significant. Same for other dimensionless numbers and physical phenomena (Froude number etc). Though note: compressibility is not the same as "exerting pressure". A hydrofoil or marine propeller works on pressure differences, even though the fluid is effectively incompressible.