Hello, wind and wing foilers.
I?ve already made the main wing and enlarged my fuselage for a NP old pinkie foil. Works great. But I want a new wing and I have some doubts I would like to share:
1.- Design parameters:
a.- Total weight = lift so it?s a level flight.
b.- Main wing angle set to 15 knts Cruise speed.
c.- Main Wing profile, size, shape etc requires 0? angle of attack al 15 knts.
2.- If the wind drops and my speed decreases to 8 knts:
a.- The wing will require an angle of attack of 7?
b.- I have to change the equilibrium point back so I achieve the 7? angle.
c.- To move the equilibrium point back I have to do a combination between the increase the back foot pressure, move the mast base back, increase stabilizer angle.
d.- Fuselage travels a an angle of 7? increasing drag.
3.- If the wind picks up and my speed increases to 25.5 knts.
a.- The wing will require an angle of attack of -2?
b.- I have to change the equilibrium point forward so I achieve the -2? angle.
c.- To move the equilibrium point forward I have to do a combination between the increase the front foot pressure, move the mast base forward, decrease stabilizer angle.
d.- Fuselage travels at an angle of -2? increasing drag.
So, why nobody ever talk about front wing angle trimming for its achievable cruise speed maintaining the fuselage level and keeping the whole system to minimum drag?
Please Help...
Regards
Ignacio
Some diagrams:
The performance of the wing at different angles of atack needed to keep level flight at differrent speeds (from XLFR5).
The wing (surface, aspect ratio etc)
Diagrams.
