Homebrewed Electricity > Wind

Classical US multibladed metal wind rotor....?

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topspeed:
Are there any left ?

bigrockcandymountain:


Do you mean new ones being built or old ones still in use?

Aermotor still makes new ones last time I checked. 

The picture is a Baker Monitor WC that i use to pump water.  We still use a few around here.

Bruce S:
Looks similar to the ones still sold in Mid-Missouri too , mostly are water pumpers .
Our Botanical gardens has one in the children's section as a water pumper too, but it's so low and covered by trees that it barely does anything.

Cheers
Bruce

Adriaan Kragten:
Already in 1932, wind tunnel measurements have been performed in Göttingen on a scale model of a multibladed rotor with blades for which the chord increases at increasing radius. The measurements are given in the attachment. The angle beta is the yaw angle. The maximum Cp is only 0.3 at an optimum tip speed ratio of 0.9. So the maximum Cp is much lower than for a well designed HAWT with a design tip speed ratio of about 6 for which a maximum Cp of about 0.45 is possible. The main reasons for the rather low maximum Cp of a slow running multibladed rotor are wake rotation (see report KD 35 figure 4.2) and the fact that a rather large inner part of the rotor has no blades (see KD 35 formula 6.3).

 Rotor no 2, Göttinger Liefrungen 1932.pdf (146.43 kB - downloaded 43 times.)

joestue:

--- Quote from: Adriaan Kragten on February 06, 2024, 01:12:46 PM ---and the fact that a rather large inner part of the rotor has no blades

--- End quote ---

could a nose cone improve that problem?

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