blades dont lift enough

[Rhondas]

:p I was out side my house with gusts of 12-15 mph winds and holding my gyro with blades letting them spin up but really not enough lift to pull the body of my gyro out of my hand, I went inside and loosened my 1 holding bolts on each blade rebalanced the blades and cut some plastic away from the disk area, for more flap, I still cant get the lift that I think I will need to take off the ground,everybody says that you will feel the upward pull and backwards a bit when its working right. what am I doing wrong,sometimes I think I should try making my blades twice as wide ? dont knowwhat the reall actions of the blades are when they are pulling right, any suggestions? When you can spin up your blades by walking fast and there is no wind, is this done when the front motor is at full throttle blowing some air through the blades?

[JWarren]

Are your blades shimmed in the front (LE) or in the back (TE)? What is the incidence of the blades? Do you know? What foil are you using? Are they spinning up OK?

John

[mnowell129]

FLapping has no effect on the spin up and lift. FLapping balances the asymmetric lift situation due to forward motion.
Your lack of lift could be one of the following:
1) Too much negative pitch and you are "windmilling"
2) Too much positive pitch and not coming up to speed
3) Blades that are not tracked properly causing some blades
to be in condition #1 and some in condition #2.
4) Bearing drag as the blade begins to lift (do you have
thrust bearings?)
5) Poor blade surface finish resulting in high blade parasite drag.
6) Flutter due to blade flexibility
7) High profile drag due to the improper airfoil section chosen
8) Excess flapping due to a too soft flapping hinge resulting in "in-plane"
coriolis forces, possibly cross coupling to some positive delta 3 hinging due
to manufacturing tolerances.
9) Bearing drag due to pitch or roll forces.
10) Some other issue.

It is likely that you are experiencing some combination of all of the above. It is up to you as the designer to figure out which ones are affecting you and take corrective action.
I cannot give you specific advice because your model is unique.

[Rhondas]

thanks Mnowell. Ill try each setting

[Rhondas]

Are your blades shimmed in the front (LE) or in the back (TE)? What is the incidence of the blades? Do you know? What foil are you using? Are they spinning up OK?

John

Thanks ,my blades do spin up good on the ground the other day they really spun but pushed the whole body back a little and the front engine prop couldnt overcome the rearward force of the wind blowing I think in the next thread :o is part of my problem, to much neg incidence