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W74EM SERIES WOOD PROPELLERS
FOR 150 MPH/160 HP AIRCRAFT
For aircraft which cruise in the 120 - 150 mph region and use a Lycoming O-290 or O-320 series engine, Sensenich recommends the W74EM-( ) series propeller. This propeller was designed specifically for 150 mph aircraft, with tailored airfoils and pitch distribution for maximum efficiency. Laminated construction is used, with 6 laminations providing the proper combination of strength and material stability for tractor aircraft. All Sensenich propellers are manufactured under strict production certificate standards, with material certification and a 48 point conformity inspection for each experimental category propeller.
Propeller pitch is selected as appropriate to aircraft type, engine rating, and climb/cruise preference. A Uralite leading edge is cast in place on the blade, which provides superior protection without any aerodynamic penalties.
Clear polyurethane finish is standard, with a gloss gray option.
The adapter assembly includes: crush plate, propeller mounting bolts, adapter mounting bolts, and adapter with customer specified extension length. The 1.25" length adapter is a "solid" type, while adapter lengths 3" and longer are of the "spool" type. Custom adapter lengths are available.
| Specifications: |
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Standard Diameter
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74 inches, can be shorter if desired
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Hub Thickness
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3.38 inches
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Total Weight, (prop. only)
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10 lbs
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Prop + 1.25" assembly
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15 lbs approximate
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| Propeller Recommendation (dia. x pitch): |
NOTE: The standard pitches below will result in full throttle / level flight RPM’s approx. 2700-2750 at sea level. To reduce FTLF RPM’s by 100, increase pitch by 2 inches. |
| Long Eze/Cozy/Velocity: |
| Engine |
Climb |
Standard |
Cruise |
| O-290/125 HP |
74x50 |
74x52 |
74x54 |
| O-290/135 HP |
74x52 |
74x54 |
74x56 |
| O-320/150 HP |
74x54 |
74x56 |
74x58 |
| O-320/160 HP |
74x56 |
74x58 |
74x60 |
• Aerobatics: subtract two inches of pitch (i.e. use climb pitch).
• Field elevations above 4,000 feet, subtract two inches of pitch.
• Diameter and pitch changes are interchangeable for equivalent RPM’s: i.e. add 2" of diameter, then reduce pitch by 2" and vice versa.
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| Pricing: |
| p/n |
Category |
Price |
| W74EM-( ) propeller |
experimental |
$897 (year 2000 price) |
| color option: gloss gray finish, white stripes |
N/A |
$60 |
| M6S5 (1.25") solid adapter + hardware |
experimental |
$565 |
| M6S16 (4") spool adapter + hardware |
experimental |
$578 |
- When ordering propeller for O-320 engine, please specify whether using 3/8 or 7/16 diameter propeller and adapter bolts.
- The experimental "solid" adapter includes safety wire slots for added bolt torque security.
- Prices subject to change without notice.
- FOB Plant City, Florida, USA.
- Delivery: 4-6 weeks typical.
- Sensenich does not have an off-the-shelf spinner available for this design, but recommends Aircraft Spruce for spinner options. You must specify adapter type, hub drilling, and hub thickness when ordering.
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Sensenich Wood Propeller Co.
2008 Wood Court - Plant City, FL 33563
Phone: (813) 752-3711 - Fax: (813) 752-2818
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