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Sarah's Personal Cruiser
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Date:  12-22-2012
Number of Hours:  30.00
Manual Reference:  Original Design
Brief Description:  Speed Brake Design

This is a revision to this page since it lays out the design effort and not the actual construction. The Personal Cruiser that my aircraft is based upon does not have any form of speed brake system however I feel it is an important feature for a composite aircraft. The initial design had the panel attached to the belly skin by a piano hinge at the forward end and some form of actuator attached further back. When I took the time to seriously finalize the design that was just not practical but I came up with the alternate approach shown here. This design is based on a torque tube that is attached to the panel and a 6" throw linear actuator from Frigelli Automotions. It has a 200 lbs force and built in limit switches although those will not be used. All parts are painted green to denote that they are part of the secondary flight controls system.

1) This is a side view of the system as designed and shows the panel in up, half way down and full down positions along with the rough shape of the actuator arm that will be used. Note that there is a microswitch to indicate not full up to the Warning, Caution and Advisory system

2) This is a top view and it shows details of the torque tobe and all the pieces attached to it. The torque tube has to be split at the BL 0.0 so tha the pieces can be fitted into the aircraft without a big hole in the fuselage side. The tube has to pass through the structure that transfers main gera load to the wing and fuselage so the smaller the hole the better.

3) This is the electrical schematic for the actuation of the speed brake panel. All wires and major components have a unique identifier, based on ATA spec2200 chapter and subchapters, that they will marked with, The cockpit control will be a thumb switch on the top of the throttle lever, aft momentary only for extension and fwd momentarily to retract. This orientation was chosen so the switch movement correspondes with what you would move the throttle for, i.e. bak to slow down, forward to speed up. It would be better if retract
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Side View - Full Up, Mid Way & Full Dn

Side View - Full Up, Mid Way & Full Dn

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Electrical Schematic

Electrical Schematic

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Electrical Schematic

Electrical Schematic

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