DUC HELICE

SPACERS

Usually, the best assembly of propellers are carried out directly on the propeller shaft but, according to the type of engine, we recommend the assembly of an adaptator spacer for assembly safety measures.
The various DUC spacers make it possible to adapt the assembly of propellers in specific configurations to obtain for example a shift of the propeller for the passage of various engine casings or various accessories.

You will find all technical data like the notes of assembly ( PDF files ), the 2D drawings of parts ( JPG files ) in the complete range of DUC accessories.
DUC accessoires range

Engine and propeller shaft

You will find, at the foot of this page, the various drawing of the most current propeller shaft of the 4 times engines.

1. ROTAX engines :

Concerning the 2 times engines ( type 503, 582 ), the propeller is assembled directly on the propeller shaft with the 6 CHC M8 provided screws.
For the 4 times engines like 912, we can distinguish two types of propeller shaft corresponding to two generations of ROTAX 912 engines :

Old generation : ROTAX 912 engine up to approximately 1998
The particularity of the propeller shaft of this engine is the presence of 6 M8 tapped holes for the assembly of the propeller hub. Once the setting in rotation of the propeller, a shearing force is located on the threading of the 6 fixing screws of the hub. It is why we recommend the assembly of an 912 adaptator spacer for the fixing of the propeller which allows a more resistant connection by locating the shearing force on several drive pawns and indexing pins.
- 912 adaptator spacer with thickness 10mm : note of assembly 912 - A/10
- 912 adaptator spacer with various thicknesses 30 / 45 / 50mm : note of assembly 912 - 912H - A/30
New generation : ROTAX 912 engine since approximately 1998.
On this new generation ; the 6 M8 tapped holes of the propeller shaft were replaced by 6 gauged smooth holes ø8mm. The direct assembly on the propeller shaft is possible because the 6 M8 fixing screws pass through these 6 smouth holes ø8mm and they are tight with 6 M8 locknuts behind the propeller shaft. In this case, the shearing force is not located on the threading but on the smooth bodies of the 6 M8 fixing screws which allow a better resistance of the assembly.
The 912H adaptator spacers, intended for theses engines, allow a shift of the propeller compared to the drive range for the passage of accessories or engines casings.
- 912H adaptator spacer with thickness 10mm : note of assembly 912H - A/10
- 912H adaptator spacer with various thicknesses 30 / 45 / 50mm : note of assembly 912 - 912H - A/30

2. JABIRU engines :

The assembly of the DUC propellers on this engine can be carried out according to two cases :

Use of the DJ /DUC propeller shaft : This DJ/DUC propeller shaft replaces the origin Jabiru drive range and It is assembled directly on the JABIRU
crankshaft : Note of assembly DJ / DUC.
Use of the JABIRU adaptator spacer : note of assembly J - A/30

3. VERNER engines :

Just like the 912 ROTAX engines old generation, the assembly of the VERNER adaptator spacer with thickness 10mm is necessary.

Use of the VERNER adaptator spacer : note of assembly V - A/10

Drawings of the most current propeller shafts :


ROTAX 912 New generation	ROTAX 912 Old génération

JABIRU	VERNER

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E-mail : contact@duc-helices.com