Plans -> Main Web Page - Parts list
These drawings are scaled to print 8x10 but the resolution is poor. For color & better detail, click on "Detail"
D1, Exploded View
D2, Feathering Mechanism
D2 detail
D3, Frame, Turntable & Wireing
D3 detail
Exploded View (D1)
Feathering Mechanism (D2)^
D2 detail.
The feathering spring, part(C12) is attached to the wood frame by a screw eye, part(C15), see D1, D2 and Bottom View. The springs' lower end hooks through a 3/16 inch hole in the alternator pin part(C7). This pin can be shifted to adjust the springs slack at rest. The strength of the spring should be 15 to 17 pounds extended 1 foot. The spring has two functions: to reduce gyroscoping (Yaw) in gusts, and to allow the alternator to reach it's max output before 100% feathering.
Parts (E13) shown here are an alternative to the mercury switch (see D3). The wire from the Ignition side of the Voltage Regulator attaches under the mounting screw head of (E13-b). A 600v. 5mfd diode (E19) supresses sparking at the contacts. An alternate protected location for the diode is shown in D3 right. Without the diode, the contacts will need cleaning every two weeks or so, and the contact will cause radio static.
E13-a: 16 guage iron, (galvanized, or stainless) 5/8 X 10 inches.
E13-b: 16 guage copper bent to an "L".
E13-c: 16 brass Round Head machine screw, 10-24 X 1 inch.
Frame Drawing (D3) ^
D3 detail.
Important:
If the tail bolt nuts (F5) work loose, the tail vane will fall off, the machine will orient downwind and be unable to feather, and the blades will break. A flying broken blade will outraged some important republican spook who will toss you into debtors prison forever. Talkshow intellectuals will mock you.
Fortunately, this possible future may be easily avoided, simply use Lok-tite thread glue, nylon lock-nuts, or ding the threads, (and count your blessings).
^