Now just to disturbe your own restless ugre to create
what about 3/Three, Single blades on a common shaft to balance
out the act yet spaced enough the wind interference is nulled?
There was posted not long ago of 7 tri blades on a common shaft
that worked well. It'd be a neat conversation piece eh.

I don't know if below concept can balance a single wobbler as yours
but might be a DIY project to fine tune more balanced systems.
Might look into a ring filled a bit w heavy fluid, mercury to ceramic
beads or lead shot in oil.
Here's a concept site but besides props its used in road wheels and
crankshafts.
http://www.balancemasters.com/ultralightarticle.html
http://www.innovativebalancing.com/

Last night I did some rethinking, way did a build a one-wing mill?
Correct me if I am wrong, turbulence lowers the efficiency of a windmill, I mean turbulence of his own wings. So, a one-wing mill rotates faster in low winds than a multi wing mill.
This triggered me to build this type of windmill, I live in a low wind area, barely 5-15km/h.
Ok, a maple seed is all about low wind, high speed and centrifugal force. So, it is a good glider and it must make a good low wind windmill (lift

Some thoughts:
Mother nature, did not consider an option to fix a maple seed on an axel, thats the reason those side effects exist.

I think the counterbalance must be placed as close as possible to the axle, than you minimize turbulence interfering the wing.

Enlarging the centrifugal force could dampen this wobbly effect, modifying the tip weight and modify tip shape could do this. Maybe like this maple seed:



Humans are capable of evaluate and modify things a million times faster than nature. So we will overcome these side effects.

I know my writhing sounds stupid, my English is terribly rusty.

Unfortunately, you won't be able to maintain it over a range of speeds and wind loads.  The dynamic imbalance force goes up linearly with the speed of the blade.  The wind force goes up by a function of the wind speed that, if I recall correctly, has a significant square and a nontrivial cube term.

Even if the force from the wind speed went up linearly, the genny load on the blade will make it want to hold roughly the same speed, speeding up only slightly with increased wind, after things are up to cutin.  (And you ALWAYS want to be above cutin.)  And even if you could get it to balance across a range of speeds (say, with something that adjusts the weights), the wind speed, and thus the wind load, changes rapidly and the blade can't react to that quickly - so it would vibrate until it came to the right speed.

Potentially you might use blade vibration as feedback to adjust the dynamic-balance counterweighting.  Say by putting a pair of automatic tire-balancing devices on the shaft, one ahead of the blade and one behind it.  (These are circular tracks with ball bearings.  Vibration causes the bearings to move to where they balance it out, after which they just sit there until something changes.)

But even if you arranged some kind of adjustable weight system there will be some point at which it maxes out.  So when you get a storm that goes above that wind speed you suddenly get massive uncanceled vibrations - right when your mill is under the max of its other loads - centrifugal, wind, etc.  It BETTER be furled right or you come apart violently.

as Hobbit wrote (and I was going too)
"I'd suggest getting up kinda high and droping it to see what
forece prodominates and clues to next experiments"

I would suggest getting on the roof of the house and dropping it. Does it spin and feather out like a wing and seed does? Does if float slowly to the ground and land softly? I don't think it will. I think it has probably lost all the feathering effect has it not?

The blade in the picture does not look anything like any of the seeds wings I have seen. I think the ones I am familar with are all thin in width near the seed and wide out closer to the tip and rounded off at the tip, maybe tappered. Kinda thinking maybe a pot belly or beer belly type look.

Also the wing has only 1 seed pod as a balance. You have the 2 rods and wieghts as balance.

I like what you made, and you did great work, so I am not trying to be negative, it's just my thoughts.

I would think that building an actual large scale wing and seedpod would work better.
Maybe carve it all out of one peice of wood. Then balance it similar to the balance of the seedpod/wing. Once it's done I would then find the balance point of that new blade whereever it is at and that is where I would place my hub and gennie shaft.

In finding the perfect balance I would be looking for side to side balance mostly but also front to rear balance. It may be that to mount it properly it will have to mount at an angle to the shaft, not as we would normally mount a blade.

I am not working on one myself and probably won't (got too many things going already), but I would be curious if built exactly like a wingseedpod how it would work.

Again like I said, I like what you built and think it was a great job. I just don't think it looks much like a maple seed.
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nothing to lose

Below is an illustration of how a maple seed falls. It autorotates to the ground like a helicopter would. the better ones fall flatter and rotate faster and these are the ones I'm modeling. The man(or woman?) who designed the maple seed is much smarter than I so it's been a slow road of discovery but as norm has pointed out all things are pointing towards not meddling too much with the proportions of the seed. The below illustration also has a representation of what my next(V-3) blade will look like. It's less organic looking but more closely follows the proportion of the "best fliers". The seed you posted is I think a sycamore which is a maple but I think the more common maple such as a norway maple or a sugar maple is best.

Again you'll note the less "organic" shape of the next version but I after two tries I think I'm fooling myself to think making it look exactly like a maple seed will make it one. The Idea now is to mimic the maples wieght distribution, cord distribution and thickness distribution and be rid of my attempts at improving the blade profile. So V-3 will have a thin airfoil just like the maple and the counterbalance will mimic the maples dispite the fact that the thickness distribution seems backwards from an aerodynamic point of view.

True, however if a much larger exact copy works as well as the actual seed, then perhaps it would also be a much easier way to view why this does that, and what effect that has on this type thing.

In other words, a working exact copy in the correct size/scale you could copy as many times as wanted. So when the first works, copy it! Then change this or that and see how it works. If you mess it up, make a new copy of the first and try again.

A seed is not meant to be mounted, it free falls. With a larger exact copy it would be much easier also to see when/where any bending or flexing occures.

Using various materials you could also say what happens if I make this larger (add foam and shape) or cut this off here and move to there type things.

Just kinda my hands on type approach to things.

Personally I think I would like to have a birds wing to play with. Maybe a buzzard. I watch them fly around all day, they are so graceful, large heavy birds, and seldom do they need to flap alot. They just glide and float so well, they have to have alot of lift in those wings. Of course they do use alot of updafts also I am sure for all that floating/gliding with out flapping.

I sometimes wonder if a scaled up replica of those wings would spin well :)
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nothing to lose