Hamilton Standard Propeller Designations
By James C. Gorman (EAA 29182, AIC 306) P. O. Box 2599
Mansfield, OH 44906
Many Howards, Staggerwings, Stinsons and Wacos either were shipped from the factory or have been refitted with Hamilton Standard Constant Speed Propellers. To many, blade and hub designations are somewhat confusing. Perhaps the following may help. HUB ASSEMBLY
Counterweight propellers are identified by a model designation which explains in part the type and use of the propeller. The numbers and letter group in front of t he dash indicates basic hub assembly, and the number groups which follow the dash indicate minor modifications incor porated in the basic model. EXAMPLE: 2B20-213
2 - Number of blades
B - Blade shank size of 1"
20 - SAE propeller shaft spline size 213 - Minor modification of basic model. EXAMPLE: 2D30-247
2 - Number ofblades
D - Blade shank size of 1 W'
30 - SAE propeller shaft spline size 247 - Minor modification of basic model Most all Pratt and Whitney R-985 and Wright R-975 engines used 2D30 hubs. Jacobs, Lycomings and smaller Wrights were generally equipped with 2B20 hubs. BLADE ASSEMBLY
Blades are identified by design numbers stamped on the circumference of the butt end of each blade. The blade designation is similar to that of the hub in that it describes in part the use and type of unit. EXAMPLE: 6167 A-12 6167 - Basic blade design A - Letter "A" indicates a blade assembly which includes bearing, chafing ring, bushing, bushing drive pins, screws, and balancing plug assembly. 12 - Indicates the number of inches propeller diameter is reduced from that of blade de sign. In this example, diameter has been re duced 12 inches by shortening each blade 6 inches. This operation was performed at the factory, not in the field.
14 NOVEMBER 1984
APPROVED HUB AND BLADE ASSEMBLIES
D17S - 2D30 hub with following blades: 6095-15, 6095A-16, 6167 A-15, 6167 A-16, 6101A-21 T, 6101A-22T. Pitch setting - low 11 degrees, high 26 degrees. G17S - 2D30-237 hub with 6167 A-15 blades. Pitch setting - low 11 degrees, high 26 degrees. Waco - SRE - 2D30-235 hub with 6167 A-12 blades ARE , AVN-8, EGC-8 - 2B20-213 hub with 6135A-9 blades. Howard - DGA-8, Wright engine, 2B20 hub with 6109A 12 or 6135A-12 blades. DGA-11- 2D30 hub with 6095A-15, 6095A-16, 6167 A 15, 6167A-16 blades. DGA-15 - no data, but probably same as DGA-11 . Stinson - Lycoming R-680 - 2B20 hub with 6109A, 6135A blades. Dash numbers -6, -10. Wright R-760-E1 - 2B20 hub with 6109A, 6135A blades. Dash number -12, -13. Wright R-760-E2 - 2B20 hub with 6109A, 6135A blades. Dash numbers -9, -10. Pitch setting with Wright engines, E-1 13.75 degrees; E-2 13.25 degrees low. Pratt and Whitney R-985 - 2D30-209 hub with 6101A-18 blades. Also the 2D30-237 hub has been used. Two types of blades are in use: the "Toothpick", a nar row tapered blade, and the "Paddle Blade", a thicker al most non-tapered blade. Which is better may never be settled. It has been reported that the "Paddle Blade" is better for climb and high altitude operation; while the "Toothpick" is better for cruise and low altitude, but don't count on it!
Beechcraft -
Examples:
Toothpick - 6167-15, 6167-16, 6135-10 Paddle - 6101-21, 6101-22, 6109-9 The following "Table A" was reproduced from data on pages 30-31 of the Hamilton Standard Propellers Service Manual No. 110D. If the propeller assembly has an oil pipe, it can be used as a full feathering prop which is not much help on a single engine airplane. When installed on a single engine aircraft, the pipe should be plugged. Many thanks to Ray Brandly, John Turgyan and Roy Redman for their help in compiling the data for this arti cle.