1553

Item 1553

DESIGN: Electrotor-Simplex ~ Rotor - Hub - Gyrobee Information

Picture:

Picture of Taggert's hub made by outside company, for reference.

Picture temporarily borrowed.

Airframe Specifications:

Empty Weight: 250 pounds

Useful Load: 250 pounds. Assumes a 35-pound fuel load and a 215 pound pilot.

Blades: Rotordyne, 7 3/8 in. chord.

Rotor Diameter: 25 ft.

Height: 8 ft. 0 in.

Width: 7 ft. 8 in.

Length: 12 ft. 0 in.

Fuel Capacity: 5 gallons

Engine: Rotax 447 (40 hp.)

Gearbox: 2.58:1

Prop: 60-38 2-blade wood (Note 4)

Other Specifications:

Disc Loading: between 0.9 and 1.0 pounds/square foot (psf)

Main Rotor Bearing: #5206. Torrington Catalog, Fafner Ball Bearings, page 43. A supplier and specs; http://www.skatebearings.com/5206-2RS-5206-ZZ.htm

SETTING UP THE GYROBEE ROTOR SYSTEM

ROTOR HEAD SET-UP

Flight Control Range, Cherry picked from the above: This is for a gyrocopter that flies with its disk tipped back

Roll: RT says "I would strive to try to get the 20 degree total range."

Rear Stick/Head Limit: RT says "20 degrees back with the mast vertical."

Forward Head/Stick Limit: RT says "it is possible that the forward-limit of head travel could stop at the +4-5 degree point without a problem."

RIGGING YOUR BLADES

Stringing Your Blades:

RT says "The bolt holes on most blade straps are just slightly oversize, so when the straps are bolted to the bar (finger-tight) you can adjust blade alignment until they are in-string."

Hub Height Dimensions:

Teetering Hinge Elevation(Datum): 0"

Teeter stand - from teetering axis to base; 2.625"

Teetering block - from teetering axis to base; 1.5". My assumption ; If hub-bar is .75" thick then the undersling is 1.875"

Bearing Retainer Plate: 0.250"

Main Housing: 1.250"

1/2 Torque Bar: 0.5625"

Lateral Hinge Elevation:

Longitudinal Hinge Elevation:

Undersling:

Scaling Calculations Based on Gyrobee:

Scaling: The twin rotor Electrotor is to have similar specifications to that of the Gyrobee therefore each of the two rotors will be approximately half the size of that on the Gyrobee. The multiplier for Gyrobee dimentions will be .5 * √3 = 0.794

The teetering height (to center of hub-bar) for the Electrotor should be 1.875 * 0.794 = 1.489" I suspect. Perhaps it should be closer to that of the SynchroLite because this is a powered rotor and it will be turning at a faster speed than the gyrocopter.

The vertical dimension from teetering axis to pitch axis is; 2.625 + 0.25 + 1.25 + 0.25 + 0.625 = 5.0". Therefore the Electrotor's should be; 5.0" * 0.794 = 3.97"

The vertical dimension from pitch axis to roll axis looks like 1.5". Therefore the Electrotor's should be; 1.5 * 0.794 = 1.191"

For Scaling related to attachment Stock see; OTHER: Mechanics - General - Hardware

Miscellaneous:

Full plans, on .pdf, for a number of small full-size gyrocopters; http://www.rcgroups.com/forums/showthread.php?t=1100078

Last Revised: August 24, 2009