Install a wind turbine in a tree?

[Forhorse]

I especially notice that dedeleco is the specialist of great ideas and great theories ... he always leaves it to others to experiment and develop

[dedeleco]

tie a string to each treetop already becomes a barrier

is inaccurate, because it is much less difficult than changing a lamp at the top of a large lamp in a street!
With a long stick or pole, from the ground, I have already set ropes at the top of tall 15m trees (to straighten them successfully or shoot them down accurately after the late 1999 storm). Just pass the rope behind the branch to the bottom, make a noose and tighten pulling to tie a rope at the top of a tree while staying down (I have thus straightened a huge pine pulling tons with a small hoist and some well chosen knots!)
So this barrier is imaginary, only lack of imagination and experience.
Finally, the angry kindness,

that he always leaves it to others to experiment and develop Laughing

has the answer that
this I did in practice and not in theory alone, and I invite you to straighten pine 20m high and a big beech, with almost nothing, ropes, knots well studied, and two hoists 30 € each in a windfall without accident, given the danger of entangled trees !!.,
I also advise to mount the chainsaw at the end of a long arm of 4m long, as I did, to avoid accidents by unpredictable movement of trees entangled during cuts. If the loggers followed this advice there would be fewer accidents and deaths after storms, crushed by trees (we do not talk enough) !!
Then

the amount of small generator to install is another!

is inconsistent, and shows an obstinacy to be systematically discouraged, to remain well conventional, because already, to develop the principle and test it, a single generator is enough, like a dynamo bike or flashlight (between 8 € and 20 €) with a pulley mounted on it and see how it works.
The cost of the hardware for 40m rope (or string !!) and 10 € dynamo flashlight testing is very low, compared to a conventional wind turbine !!
It is to try in a place where the wind often shakes the trees (windy border).
Do you try to block the movement of tall trees in the wind already, because then you would have found that it takes not strings but beautiful ropes holding several tons, as I found on my trees straightened !!

Finally I invite Forhose to clarify his general denigration and what I leave to others the task of experimenting and developing in detail to develop it by showing him that the precise theory is a guide that avoids many experiments perfectly useless and allows to develop without getting lost in tests doomed to failure.
When considering a heat pump where the engine is replaced by a heat source, no test is necessary to know that it is impossible totally, to draw more heat, as with a mechanical engine and a compressor!
Same for all very imaginative versions of perpetual motion envisaged, with magnets or others.
Finally, for some low-power electronics schemes, I have given the principle that we find it used everywhere (current limited to the leakage current of the transistor), and I wait for the answer to my precise questions, to give a schema better than those drawn.

Besides, it's very funny to see the proverb: why make it simple when it can be complicated !!!

In addition I do not mind horses and therefore I limit myself to common sense remarks useful to avoid many unsuccessful attempts.

[aerialcastor]

The problem is not to tie a rope to the top of a tree, nor to buy a dynamo lamp.

The problem is to design the mechanical system that will transform the movement of the treetop that is relatively random, because depending on the force and direction of the wind, in a rotational movement to couple it to an alternator.

[dedeleco]

The small dynamo lamps of the trade recharged with the hand solve this problem of conversion completely with the battery. !!
Just turn a little and she recharges.
The alternator gives a voltage rectified by a diode bridge which charges the battery whatever the fluctuations in its direction of rotation.
For a first test is the simplest by putting a pulley instead of the crank and the rope passing on the pulley to rotate it.

garden and DIY

Otherwise the problem is of the same type as the energy conversion of the waves of the sea and there are plenty of patents to adapt to convert the wind waves at the top of the trees.

[Forhorse]

The small dynamo lamps of the trade recharged with the hand solve this problem of conversion completely with the battery. !!
For a first test is the simplest by putting a pulley instead of the crank and the rope passing on the pulley to rotate it.
Otherwise the problem is of the same type as the energy conversion of the waves of the sea and there are plenty of patents to adapt to convert the wind waves at the top of the trees.

I think we are all waiting for photos of your prototype with enthusiasm!
After that, all that remains is to compare the production with respect to a conventional wind turbine of equivalent power and to bring all this back to the cost price of the two solutions.

[chatelot16]

well on a rope attached to a tree of 20metre to move the crank of a dynamo lamp! to make some watt

I find it a bit insisory, but it will work! a blue string of straw boot attached to the top of the tree, passing on a drum 10cm instead of the crank, and against weight to keep the string stretched

these small lamps or nice little alternator three-phase, it makes electricity turning in 2 meaning: it is mounted with plastic gear that will not hold long in this kind of use ...

putting a real wind turbine on top of a tree is another story: a well-studied metal structure attached to the top of the tree is more economical than a mat

it is a great snub to those who want to limit the wind turbine height to 12m


I really want to build something like this, based on 3 big trees ...

[dedeleco]

but it will work!

Finally a positive opinion, for a test installation (non derisoire) very inexpensive and identify the difficulties, the different modes of assembly of the ropes and pulleys (very varied in possibilities, with counterweight, springs, and others, optimum points d fasteners on trees, etc.),
Already with a small power, we recharge a battery that provides lighting shed, initial goal! .

just a little extra for a cabanon in isolated site

It is therefore not necessary to mount a system too large with a beautiful wind turbine, which by its size and unsightly for a forest will trigger rejection reactions all the more intense, that:

it is a great snub to those who want to limit the wind turbine height to 12m

Do not believe that such a wart: a wind turbine with huge metal structure at the top of trees will not be violently banned immediately by the entire neighborhood for non-compliance.
The very substantial investment will be lost for sure and this loss will not be derisory to the wallet.
On the contrary some ropes from the top of the trees to the ground will be invisible and therefore accepted !!
The area covered by treetops can compensate for a priori less satisfactory performance at the theoretical level (except in high winds).

In addition a metal structure connecting 3 trees to hold a beautiful wind turbine will have to withstand the forces in high winds that can push these trees in the opposite direction (over the ton) without damaging young and fragile branches that serve as support at the top of the trees . The fast growing trees upstairs will require modifying this structure often in 2 or 3 months in the spring.

The order of magnitude of the forces is 100kgp / m2 for a wind of 100Km / h varying like the square of the velocity, ie low wind 10Km / h one has 1 kgp / m2 and average wind with 10m / s is 36Km / h we have 10Kgp / m2, force fluctuating around this value with displacements fixed by the flexibility and the length of the branches.
For the maximum energy you have to increase the movements with the same force and to take soft and long branches that sway well in the wind (high bamboo soft can be better !, or poplar or cypresses).

plastic gear that will not last long in this kind of use

which resist more than 500 possible refills of the small accums mounted with and seen the very low price for tests, it is possible to replace them by other gears or a rim of bicycle with the rope passing on it and the rubber of the dynamo rubbing on the rim (piece of old bike good for breaking!)

[boubka]

Already with a small power, we recharge a battery that provides lighting shed, initial goal! .

post initial 800 w ... you propose some w with a string factory
as much buy a flashlight

I think we are all waiting for photos of your prototype with enthusiasm!
After that, all that remains is to compare the production with respect to a conventional wind turbine of equivalent power and to bring all this back to the cost price of the two solutions.

I am also waiting to see.

and after that you can also reinvent hot water

[Alain G]

PLEASE! Do not be too hard on Dedeleco's ideas because he might be right!

Many brought new ideas that made them laugh, which turned out to be very good new ideas!

Imagine that someone comes out with a simple and ready-to-install package for a ridiculous price, so that would become a gold mine for the designer!

I have trees 15 meters around me with a lot of turbulence and can not install a wind turbine, this gadget would become for me greatly interesting because it is better than nothing!

Why destroy the ideas of others sarcastically rather than being objective and try to find solutions!

[Forhorse]

Oh no, but I do not criticize the idea itself. It's possible that it's a very good idea (or not ...) I do not know. I'm just saying that I ask to see.
But as often on forums we find plenty of people who give tons of advice and ideas of all kinds and who defend it tooth and nail, but we never see their own achievements ... they leave it to others to try and potentially plant!

We can have ideas (wacky or not) and share it with everyone, it's very good, it's the goal of a forum.
But when it's just an idea and we do not put it personally to show that it works we must also accept that others do not grow and do not tax them obsucrantism.