Recent content by Percussim

If the belief that global warming is a lie is banned, it proves that you have no support for its existence - QED

Please explain difference - speed of sound depends on density of transmitting medium

I think the response of gyros is as fast as the electronics and other response times can make it, practically, but, within limits of friction the gyros respond instantly. The gyros do no work - simply provide data of error for course and attitude adjustments - Sudden, step change errors should...

Definitely - acceleration, though, is strictly a change in velocity which includes direction so, surprisingly, acceleration may be achieved without a change in speed. However in this thread we are principly concerned with a change in speed. If the air was still in the free steam in front of the...

Generally the thrusters are called "retro rockets", don't need anything to push against because they work within the realms of Newtons Law of equal and opposite reaction. The gyros have a property called rigidity in space and once set up remain in a fixed position irrespective of what the...

I think thrust is mass time acceleration; not times speed - it is the difference between the freestream velocity and the speed of the air behind the prop. Acceleration takes time and is the result of a force. The formula from Makvegar is for a jet engine, including the area of the exhaust...

Thrust is a force and Force = mass x acceleration. The amount of burnt fuel gas in the air flowing through an engine is so small as to be negligible and is not included in calculations for thrust. Thus it is the mass of cold air in (which must come out) times the increase in velocity, viz...

The speed of sound is relative to the density of the medium it is traveling in. Thus it is faster in water than in air and faster at ground level than at altitude. Although Mach 2 airflight is commonplace nowadays, no vehicle has achieved Mach 1 at ground level yet. The new land speed record...