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FunctionMethod (Options Available) Launch Electromagnetic Launcher CatapultTelescoping Arm R/C Vehicle (Wheels) R/C Vehicle (Tracks) Retrieve CableVehicleTelescoping Arm Deployment (set up) (storage) Self ContainedAssembly Loading (Re-loading) Mechanical Magazine (Spring) Magazine (Gravity) Aim-controls Stepper Motor / MicrocontrollerTrajectorySpring Tension Target Acquisition Pre-programmed pointsUser aim by range/directionPattern Launch Distance Electrical Mechanical (Spring) Guidance Sensors Laser Range FinderBaseline Zeroing Communication Wireless Wired (Umbilical) Function column lists the major capabilities desired for the final design. Rows depict options investigated for satisfying each capability. Cells highlighted in green show options recommended for integration into final design 2

Catapult EML Radio-Controlled Vehicle Sling 3

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 Rabbit Microcontroller  RCM5400W  Dynamic C® integrated development environment 5

Overview of the control system logic that we are designing. Depicts a high level abstraction of the processor operation. Target Input, Initialization, Fire/Retrieve, etc. will be contained in individual subroutines 6

Nema Stepper Motor oz/in #RS Connection:Unipolar Phase:2 Phase Step Angle:1.8 +/- 5% Voltage:2.7 Volts Current:3.5 A/phase Resistance:0.76 +/- ohm/phase Inductance:1.65 +/- 20% mH/phase Holding Torque:300 oz/in (208 N.cm) Insulation:Class B (90 deg C) Lead Style:FF46-1/0.5 No. of Leads:8 Weight:2.8 lbs Large-Diameter Ring-Style Turntable Aluminum 175 lb Capacity.48" Height 7

Geckodrive Step Motor Drive G201 Supply Voltage: 24 to 80 VDC Phase Current:1 to 7 Amps Size: 2.5”W, 2.5”D,.85”H Mounting Pattern: screws Quiescent Current: 15 mA or less Weight: 3.6 oz. (100 gm) Step Frequency: 0 to 200 kHz Temp: 0 to 70 C Power Dissipation: 1 to 18 W 8

Power is supplied to the launcher via a bay of 4-8 Lithium Ion battery packs sourced from Inspired Energy Currently Inspired Energy model NL2024 battery packs are utilized Inspired Energy XP-08S and XP- 04S battery management modules are being investigated to repair / replace the inoperable system presently in place 9

Based on medieval siege weapon and modernized for our purposes Reliable, robust design for strength and durability 10

Ramp system guides incoming payload back into the catapult cup. Current design accounts for only one payload but allows for future work to incorporate multiple sensors. 11

Catapult frame construction: Material to be chosen based on further prototype testing of strength requirements and system weight restrictions. Spring to be used for launching force. Separate DC motors to be used for retrieval payload and tension catapult arm. Intent to minimize drag on payload with use of a light duty motor for retrieval. 12

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Milestones Functioning prototype 24 Feb Testing 24 Feb – 10 Mar Finalization of product 10 Mar – 16 May Eng Expo: 1 May Documentation 24 Apr – 16 May 14