Monday, September 3, 2007

Whirligig #39

 
 
Whirligig #39, 22″ x 16″ x 9″ (56cm x 41cm x 23cm), wood, aluminum, brass, asstd metal parts
 
 
 
Whirligig #39, front view showing offset hub on crankshaft and counter weight in front
 
 
 
Whirligig #39, side showing crankshaft and its free turning hub
 
 
 
Whriligig #39
featuring
Unique Crankshaft Construction for Lots of Action
New Rivited Blade Assembly
Easy Turning Industrial Bearings
and
Zephyr Rated*
*motion in 3 mph breeze
see entries for 08/090/07 and 08/08/07 for plans and crankshaft assembly
 
Check my Youtube site tomorrow for Whirligig #39 in action
Posted by Chuck at 04:22:36 | Permalink | No Comments »

Friday, August 10, 2007

Whirligig #39 Crankshaft

 
 
Crankshaft for Whirligig #39, 8 5/8″ (21.9cm) long, brass
 
 
 
 
Drawing Showing Crankshaft and Its Location in Whirligig #38
 
 
I made the crankshaft from 1/4″ diamenter solid brass rod and the crankshaft arms from 1/2″ x 1/16″ flat brass stock. I soldered three of the shaft-arm joints. The total throw is 2 inches. The loads on the shaft are very light. So far, I have not had a problem with soldered joints at the scale I’ve been working.
Posted by Chuck at 04:22:54 | Permalink | No Comments »

Thursday, August 9, 2007

Plan for Whirligig #39

 
 
Plan for Whirligig #39, 24″ x 18″ (61cm x 46cm), pencil on paper
 
 
Whirligig #39 will have three sets of blades arranged on a crankshaft. The fore and aft blade sets will be fixed to the crankshaft and drive it. The center blade set will rotate in the opposite direction and at the same time move in an offset circle two inches in diameter. I have finally located a source of sheet aluminum heavy enough to serve as a vane. This design introduces some asymmetry to construction, which will be come evident on completion.
Posted by Chuck at 05:51:39 | Permalink | No Comments »