"Starting gensets , main engines, steering pumps , lowering the ballast . How long it take and how many people is needed ?" --- Why ? Why is...
For example 1 mm Bamboo 10 mm Paulownia 1 mm Bamboo 200-400-800 g sqm fiber and Epoxy resin
"Bamboo socks" They're very comfortable. There is nothing comparable if they are of good quality --- There are high-altitude T-shirts made...
[ATTACH] 1 wing constructed with 3 elements, very good for high angles of attack, nice air-craft If the angle of attack is very small, then a...
[ATTACH] MainSail = 2 x StaySail Area It is a very logical proportion
The Force is transmitted primarily through the mast and shrouds. The aerodynamic center is usually in that area because the leading edge of the...
[ATTACH] 1 Sail Force (sir Isaac Newtons) = Max Coefficient x Sail Trim (from 1 to 0,6) x knots^2 x 0,16 x m^2 (Sail) Max Coefficient = 0,8 +...
Salty Sea Water: 1025 kg [ATTACH] x 10 m^2 = 215 K (!) Newtons
knots x knots x 0,16 x m^2 = m/s x m/s x 1/2 x 1,2 x m^2
Dynamic Pressure = 1/2 x V^2 x Density 6,48 m/s, 1,2 kg [ATTACH] x 10 m^2 = 250 sir Isaac Newton
12,6 Knots 12,6 x 12,6 (Knots squared) x 1 (Coefficient) x 0,16 (Air Density plus knots-meter confusion) x 10 squared meters = = 254 sir Isaac...
Motor boat or Sail boat For 0.40-0.60 Froude or For > 0.80 Froude Upwind or Downwind Waves 1 meter High or 6 meter High Mediterranean or Atlantik
Balance Above in the first diagram the Hydro Drag based Balance is by Andrew Claughton, and the Aero Drag based Balance is mine....
[ATTACH] A small detail that can be important in some cases: Down/Sidewash Downwash - Wikipedia https://en.m.wikipedia.org/wiki/Downwash If...
[ATTACH] "Hydro Drag" ... Obsession
[ATTACH] 1967 "Aero Drag" ... Obsession The doomed crew below deck: sweating and sweating, moving the big winches while two enjoy the fresh air
Upwind must also be taken into account when the wind increases the "Aero Drag Angle" (ea) increases For Example 25 Knots Upwind tiny 19.64 ft...
[ATTACH] "Hydro Drag Angle" (eh) Low Aspect Ratio Keel --- "When tacking upwind we can go 32 deg to apparent wind, but have 15 - 20 deg leeway...
9a 9a has no solution, so the sailboat must be prepared to capsize. Wild/rogue waves (and holes) exist; until recently, the scientific community...
[ATTACH] The list of misfortunes since, say, 1979 is more or less the same, over and over again. 1) Falling overboard 2) Losing the Mast 3) The...
