The Wind is Free!

Hello Nick. Have you looked at this?
http://windpower.org.za/bladecalcs/blades.php

Hi,

My English level isn't high so forgive me for any mistake.

Im a college student from Greece and i make a project about the blades of wind turbines. I try to calculate the chord line and angle beta of each station of naca4412.Does any know the formulas for the calculations?

Nick

The Hub. When I got the 1.5 m blades from Windgat he also gave me the two drilled discs that form the hub for the blades. They are made out of marine ply. I just "knew" that would not do for me. Something would break and calamity ...

Teething troubles. Windgat said I can test the 1.5 meter blade set that he got. I'm honoured. He showed me what they had done to the swivel on his mount. It was bent like a drinking straw and I immediately realised that BIG forces were involved. I should ...

http://img69.imageshack.us/img69/4161/bladebracket.png Here is my blade bracket... http://www.goldenmotor.com/hubmotors/hubmotor-imgs/f-e.gif here is my motor http://www.barden-ukshop.com/ekmps/shops/bardenuk/images/air-x-replacement-blade-set-1272-p.jpg ...

... horizontal.... if i go verticlal i will be doing the Lenz II Wing Kit setup but if I go horizontal I'm not sure what to do, I can get some AIR X blades for cheap but was wondering between the two what can i expect for RPM's? with the lenz blades I plan on adding some pvc in the center of the ...

I have just put a simplified online blade shape calculator at http://windpower.org.za/bladecalcs/blades.php It shows the ideal blade geometry for a given angle of attack. The default blade profile is the NACA 4412. Its useful ...

Looks interesting! That's a two blade design, so it will spin faster than a three blader, which normally means it will be noisier in high winds (10m/s+). Have you run it that kind of wind? We get lots of wind here - I have seen a consistent ...

This is the link to a home made wind generator. The blade plan (click on it to download the high quality file) in the upper right is the best blade I have ever used! The link is here- http://www.tongacharter.com/report-wind.htm My question is the alternator ...

... used between 50 and 88 turns per coil for 1mm wire. More turns = more voltage per RPM, so it all depends on the voltage you plan to draw, and the blade size. 88 is very hard to make fit - I wouldn't go for more than 75 turns with 1mm wire. Its not too expensive to make a stator, so maybe take ...

... gale force. The rotor was planned around od 300mm and the stator to suite. Nine coils (three coils per phase) and twelve magnets per rotor. The blade size will be adapted to power the rotor. That won't be to difficult. I'll play around once I have bench tested and know what I get at what speed. ...

... plan the generator to make (within a few volts), unless you have an electronic circuit to convert voltages, I think I misunderstood earlier re the blade size (you were talking rotor disk size, right?). How long do you plan the blades to be? Do you have any idea of an average wind speed at the site? ...

Say you have a 6m/s average wind and a 1m radius blade. Being a bit conservative, that would give you 200W average (in high winds you would get a lot more than that, which would actually push the average higher). That makes about 144 kWh per month, ...

... this idea with a design developed by Imad Mahawili through Grand Valley State University's Michigan Alternative and Renewable Energy Center for a blade tip generating system (see a commercial version at: http://www.earthtronics.com/honeywell.aspx). I would like to see if anyone on this forum could ...

... to use the latter as the design would not take up too much space. Im not hoping for much, somewhere in the 300W Range, @ 24VDC. I got a nice 3 blade, 5 ft, composite, variable pitch aircraft prop to use ass well. :twisted: I aim to wire up the rig in 6 or 9 phases. I would also like to build ...

... I drove past the wind turbines near Darling, and on impulse dropped in. A very friendly Dirk Mostert showed me around. Dimensions: The turbine blades are 29m, and turn at a constant 18rpm, rated at a max of 1.3MW. The blades are fixed pitch, although they can be manually adjusted to different ...

Hi, I'm currently working on a wind turbine using ABS pipe for blade material. I'm actually building 4 of them. I chose ABS over PVC for 2 reasons. Reason one, take a piece of ABS pipe and a piece of PVC and secure them in a vice. Hit them both with a large ...

... (eg:Betz limit x efficiency) fmax (horizontal hi-speed turbine) = 0.46 fmax (VAWT: Darrieus )= 0.42 A (horizontal turbine)= ? x R² In which R = blade length [m] A (VAWT)= R x W In which W = width of the swing [m] Ratio VAWT/HAWT = (W x 0.42)/( ? x R x 0.46) = W/(3.44 x R) = 0.29 x W/R So, If ...

I agree, if the design works maybe will have to enlarge blade size to get over gogging effect or get down to paper and look at another layout off coil to magnet. Currently I have no idea what torque value's are.

... place something like a pipe with a shaft inside that gets held inplace by taper bearings similar to a stub axle off a trailer that gets fixed to a blade. Now you can turn the blade by means off the stub axle arrangement. Now on the shaft that is fixed to the blade attach a arm off some sort that ...

... move the leaves on the tree next to me but the unit was turning with ease. Tried to place 5sec video clip. The geni is ready but want to test the blade desigh before ant major installs.

There is a "blade design" program that I have downloaded from the net that you place all your blade info into and it also gives you an indication what your vain size should be, have lost the site were I downloaded this from, sorry. It was a free program.

... two iron balls attached to arms that pivot at the top and has a lever halve way on the arms that then controls any item that you want in this case blade pitch. Think off using a trailer stub shaft to attach the blade to (3 off) these units = 3 blades. Place an offset flat plate on the outer shaft ...

Hi all
I do have a lot of hard drive magnets and only use the big thick ones
I used a thin grider blade to cut them in half and that solved the problem . Now I have a north on the one flat side and the south on the other
If used as is, the wave cancels out and you get nearly no voltage.

... length per coil (m) 8.40 Coil resistance [ohm] 0.1844 Max Coil amps @ ±1 kW input into a 2kW element 4.92 Total heat loss @ max amp [Watt] 80.3 Blade length [m] 1.35 windspeed [m/s] 8.5 Available mechanical Power (Watt) (80% of theoretical max) 895.39 Suggested Tip Speed Ratio (2 blades) 6 Estimated ...