The Enerdyne Frog! Enerdyne - The Science and Nature Store

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OpticsScience and Nature PlaythinksHome and GardenPetoskey StonesBooksSerendipity
Welcome to Enerdyne!
Visit Enerdyne for all of your science and nature gifts* Products
Year-round: Wednesday-Saturday: 10AM to 5:30PM
Spring/Summer/Autumn: Monday through Saturday: 10AM to 5:30PM, Sunday: Noon to 4PM.

Pictured at right, our store in
downtown Suttons Bay, on Michigan's
Leelanau Peninsula -- land of delight!

Shopping for gifts? Enerdyne's website exists to introduce you to our science and nature store and its products. We also provide interesting information about various science/nature topics. We'd love to have you stop in and visit Enerdyne in person or attend one of our Events, but we're also happy to serve you by e-mail or phone (231-271-6033) as necessary.

Current Solar Image
Optics Optics-----For current Astronomy news see Skies News.
Browse our Optics department for telescopes and telescope accessories, binoculars, spotting scopes, and other optical aids to observation. Check out our magnifiers and microscopes!

Science & Nature Playthinks Science & Nature Playthinks
What are Playthinks©? They may be infant, toddler, or preschooler toys like Folkmanis puppets, or Marionettes, wooden toys by Lights, Camera, Interaction (Melissa & Doug), Games & Puzzles, Brunton Compasses, other scientific equipment & supplies and toys, or decorator objects. They also include hobby and craft items such as Breyer Horses -- and they all in some way foster an appreciation or understanding of science and the natural world.

Petoskey Stones Petoskey Stones
Beautiful Petoskey Stones from Michigan's "little finger" have great appeal as polished collector specimens, bookends, and clocks, or set in sterling as rings and other jewelry. View our Petoskey Stone Gallery to "Buy what you see".

Home & Garden Home & Garden
Enter our Home & Garden to find weather stations and weathersticks; Bird, Bat, Butterfly & Bug products; garden decor items including the popular Wind Chimes; and surprises like Flower Fairy collectibles. See our Burt's Bees personal care products; and color changing Wondermugs.

Books Books
Browse our Books section for a great selection of books and posters, charts, maps & globes, satellite Images and much more.

Serendipity Serendipity
Expect the unexpected!
Origin of the word Serendipity

About this site: Price & Availability Updates and No bugs or cookies!

Fact: Experimental wind plants in the United States, Denmark, France, Germany, and Great Britain during the period 1935-1970 showed that large-scale wind turbines would work, but failed to result in a practical large electrical wind turbine.

The largest was the 1.25 megawatt Smith-Putnam machine (Figure 8, at right), installed in Vermont in 1941. This horizontal-axis design featured a two-bladed, 175-foot diameter rotor oriented down-wind of the tower. The 16-ton stainless steel rotor used full-span blade pitch control to maintain operation at 28 RPM.

In 1945, after only several hundred hours of intermittent operation, one of the blades broke off near the hub, apparently as a result of metal fatigue, and was thrown over 1/8 mile. This is not surprising considering the huge loads that must have been generated in a structure that had a lot in common with a gigantic rotating erector set.

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