Gottigen blades

[Dan the Handyman]

Hello all,

 I am looking for The design of Gottigen blades. I saw a couple of posts, but the pictures didn't come up. I saw Dave Moller's website, and have a clue I could do them mostly on a table saw. My version would be a bit smaller.

 Thanks in advance.

 Dan the Handyman

[Electron Pump]

  Those arent something I'm familiar with. Give us a description.

[stop4stuff]

A quick google for 'gottigen blades' leads to corrected results for 'gottingen blades', & then a search for 'Gottingen 417 blade profile' gives...

The UIUC Airfoil Coordinates Database - scroll down to the 'G' section & you'll find 100's of Gottingen blade profiles

[Dan the Handyman]

Hey Stop4,

 Those airfoils are for airplane wings. Thanks anyway.

Hey Electron pump,

 If I am corract, the Gottigen blade has a concave face with no twist or taper. The back is pretty much just rounded over. Thanks

 Dan the Handyman

[Flux]

Virtually aerofoils are for aeroplanes. Until the last few years there was not enough interest in wind power to do expensive wind tunnel tests for anything other than aeroplanes.

Most wind power uses such profiles, chosen to suit Reynolds number and other factors more suited to wind power. Glider and man powered flight sections are more related to wind power in some ways.

The Gottigen profile you are probably after was the one used by Wincharger for their props, I have no idea which it was but it will be one of that family.I think it is one of the higher lift sections and probably critical to reproduce.

Flux

[stop4stuff]

look at the 417a profile, concave face, back rounded over, just like a 'pipe blade'

http://www.ae.uiuc.edu/m-selig/ads/afplots/goe417a.gif

& googling 'Gottingen windcharger blades' brings up...

http://www.fieldlines.com/story/2008/6/13/175349/624

"the Otherpower.com Discussion Board

Wind Generator Blades: We are using the Gottingen 222 profile on blades from 5 feet to 9 feet long. .... They are basically a copy of the old Wind charger blades no twist and high ..."

the 222 profile is listed on the page i linked to...

http://www.ae.uiuc.edu/m-selig/ads/afplots/goe222.gif

need anything else

[Dan the Handyman]

Hey Stop4,

 Don't know how I missed Royal fabrication's page on Wincharger. Thanks for the help. Once I get the dimensions down I can start making a set. It wasn't my spelling, I took it from another post on this forum.

Hey Flux,

 Thanks. See above.

Dan the Handyman

[Electron Pump]

  Those profiles look good to me. I am anxious to hear how they turn out. Good luck, and stay in contact with us.

[Dan the Handyman]

 Hey Electron pump,

There is a guy on this forum, DanB, or DaveB, can't remember which, that has a set of these running for a water heater. Mine will be more aggressive to power a treadmill motor, hopefully to solve the problem of gearing losses. Then more of these wasted motors can be recycled.  

 Hopefully, no one is in a hurry for my design, as I take quite a while to come up with a reliable, repeatable process. I can stare at my table saw for days, after work, to see how to cut a new project. My first set of blades took almost nine months of research and very little sawdust. 3rd set, good to go.

 Thanks to all!

 Dan the Handyman