This aluminum Duoprop propeller set from Solas is the A7 variant in the Duoprop type A series for Volvo Penta DP 280 and DP 290. The set is intended for diesel engines and consists of a matched front and rear propeller.
The two counter-rotating propellers have a different number of blades. The front propeller has 3 blades, while the rear propeller has 4 blades. Both propellers have a 21" pitch, equivalent to a nominal 533.4 mm.
The front propeller measures 15.3" in diameter, equivalent to a nominal 388.62 mm, and has 27 splines. It is left-handed and rotates counter-clockwise. The rear propeller measures 13.75" in diameter, equivalent to a nominal 349.25 mm, has 19 splines and is right-handed with clockwise rotation. Both propellers are finished in black aluminum and have a rubber bushing in the hub.
The set corresponds to Volvo Penta OEM set number 854770. The Solas manufacturer number for the front propeller is 8512-153-21, while the rear propeller has manufacturer number 8513-138-21. The corresponding original Volvo Penta numbers are 854780 for the front propeller and 854790 for the rear.
The type A family is developed for diesel engines, but the choice of A7 also depends on the boat's load, gear ratio, maximum engine RPM, and speed. Propellers from type A, B, and J or different sizes must not be mixed on the same drive.
Correct original mounting parts must be used for installation. The choice between propeller cone kits M16 and M20 depends on the specific propeller shaft. Spacer ring 853676 is used specifically with type A propellers. Always follow the drive manual for assembly and tightening torques; special tools may be required.
Key featuresComplete set with front and rear propellers
A7 for Volvo Penta DP 280/290 Duoprop sterndrives
Front propeller: 3 blades, 15.3", 27 splines and left-handed rotation
Rear propeller: 4 blades, 13.75", 19 splines and right-handed rotation
Pitch: 21" on both propellers
Black aluminum with rubber bushing
OEM reference for complete set: 854770
Solas components: 8512-153-21 and 8513-138-21
Always check the drive model, propeller type, variant code and original part number before purchasing.
