Curmudgeon in Training (CIT)
- Apr 13, 2009
- Warren, VT USA
-allmost all construction/projects are based on PROPELLER as thrust/liftHere is link to Airventure 2018 eVTOL forum:
According to Einstein's theory acceleration and gravity are the same and indistinguishable. Hence an accelerometer will measure the acceleration due to gravity.-allmost all ACCELEROMETERs phisically are "G"-meters, they do not measure acceleration,
("accelerometers" have not speedometer!)
Not disagreeing with that. Still resolves dead center between the two. So how does the resultant end up 25% from the front?:think:
Sum of the pitch moments is about the CG and both are of the same sign. The lift from one wing gives a positive moment about the CG and the other a negative.
I have another can of worms. BF can operate at 50 feet agl and below for an entire flight. It could even follow terrain while maintaining less than 50 feet agl. Think WIG but not limited to relatively flat terrain or water.
In class B or C airspace that starts at the “surface” with the surface in some parts of said airspace being navigable waters, can a WIG legally operate? Watercraft of sizable height can operate within a few hundred feet of the runways at KSFO. What I’m wondering is does the FAA care about vehicles that don’t “protrude” above 50 feet agl.
To repost #395:It's my understanding that WIGs that can't get out of ground effect are not deemed aircraft. It's flying capability, not altitude.
Ground effect is in physics often said to extend to one wingspan or on chord high, whatever is largest. Jurisdiction may differ from physics and change with localisation unlike physics.An Ekranoplan (WIG) is a boat or rather a ship depending on the size.
Fun thing, less if you are to design a small personal Ekranoplan, is that how high you can “fly” in ground effect is linear with size. A 1000 ton Ekranoplan with a 100m wing span can fly in ground effect 100m above the surface. Now, that is a 1000 ton ship moving 300 feet above the surface. Watch out for the vorticec!