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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Maybe x axis is position on the aerofoil, and y axis is magnitude of the pressure, probably normal to the surface. If you integrate vertically, you'll get the total lift, if you integrate horizontally, the total drag, taking account of the surface normal.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Patrick the lower side is the direction of rotaion, the larger area end is the hub. With the top graph, don,t worry about the angle the linear line is, that can or should be horinztail, the x axis is width, the y axis is height, it is the shape the bottom wood blade should be cut to.
The theory is pretty much the drag goes in the oppisite dierction to lift, and what would be good for left, if moved to the bottom or back of the prop will be bad. You have a 180 cicrle with two 45 degree lines which the diection of force comes from, the blade is then changed to make the stuff going into the wind, dierction of rotation have high force, while the back has force going the opposite dierection and needs to be minmized by make the force point out from the hub, while the lift part point into the hub to support rotation.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Im going to petition for an independent study class, and launch a related kickstarter. Once i have some funding, i think ill make more headway faster. we'll be able to see larger props from the chinese, and if there any good.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Patrick wrote ...
Im going to petition for an independent study class, and launch a related kickstarter. Once i have some funding, i think ill make more headway faster. we'll be able to see larger props from the chinese, and if there any good.
Why not feed some data into VABS and XFOIL now that we've established what the relevant data is?
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Propeller Physics and VABs Program.
