Dowty-Q400.pdf

Part of GE’s Aviation Business Dowty Propellers is a leader in the design, development, manufacture and support of electronically controlled, allcomposite propeller systems.

The 6-bladed R408 propeller for the Bombardier Q400 Dash 8 aircraft incorporates advanced technologies developed by Dowty Propellers over the past 60 years. It offers the following benefits: • Advanced swept blade design – Optimized ARAD-A aerofoil sections – Excellent climb and cruise performance – Very low noise levels continued on page 2

Bombardier Q400 Dash 8

Dowty Propellers

Bombardier Q400 Dash 8 Advanced Propeller System

• High integrity all-composite blades – Low weight – Service proven, rugged construction – Unmatched 25-year record of operational safety – and reliability – Highly effective erosion protection system • Fail-safe electronic control system – Precise speed selection and synchrophasing accuracy – Counterweighted blades assure safe coarse-seeking – operation – Dual lever cockpit control • Low maintenance costs – Modular configuration – No mechanical linkages to cockpit – One piece hub with individual blade replacement – Low parts count

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Propeller and backplate Overspeed governor Pitch control unit Auxiliary pump Spinner De-icer timer Beta tube assembly Brush block bracket assembly Propeller electronic controller

continued on page 3

Propeller backplate Overspeed governor

Brush block bracket assembly

Auxiliary pump

Propeller electronic controller (nacelle mounted)

Spinner

Pitch control unit

Beta tube assembly

De-icer timer (airframe mounted)

Dowty Propellers is a leader in the design, development, manufacture and support of electronically controlled, all-composite propeller systems.

Propeller data Diameter:

13.5ft (4.1m)

Activity factor:

103.5 per blade

Tip sweep:

18˚

Aerofoil section:

Modified ARAD-A

Speed control:

±1rpm of selected rpm

Max rpm:

1020

Cruise rpm:

850

Phase control:

±1˚

All over polyurethane spray coat

Blade assembly

Lightning conductor earthed to metal root

Carbon/glass fibre envelope

Counterweight assembly Outer bearing assembly Flange attachment

Operating pin assembly

Polyurethane foam core

Composite blade construction Inner bearing assembly

Beta tubes Crosshead

Piston

Backplate

De-icing slip ring

Cylinder Hub

Propeller hub

Carbon fibre spars

Nickel leading edge protection

Dowty Propellers Anson Business Park Cheltenham Road East Gloucester GL2 9QN UK T: +44 (0)1452 716000 F: +44 (0)1452 716001

www.ge.com/aviation

GE Aviation Systems Ltd

GEA-GL-03-10.08D(R)