1. Buoyancy Analysis Inputs:

2. Buoyancy Mechanical Design Johnson Electric Motor (12V) –High rpm (16,000 rpm@12V) –Lightweight (7.50 oz per motor) Alexander Engel Gear Set –Proven for piston systems Threaded Piston Rod –6 mm Piston Head –Aluminum –Machined in-house Cylinder –Aluminum –Machined in-house –ID x OD x thickness: 2” x 2.25” x 0.125” Batteries –4 DuraTrax Receiver NiCd Flat Pack 6 Volt –2200mAh (600mAh required per motor) –Length x Width x Height: 3-1/4“ x 1-3/4“ x 5/8" –Weight: 4.8 oz Sealing –Precision Associates Inc. –Piston Head Seal 75-1.8401.84” ID x 0.075” C/S x 2.0” OD –End Cap Seal 25-2370.237” ID x 0.025” C/S x.287” OD

3. Buoyancy Electrical Design Ballast Tank switch (BTS-II) –Proven system for remote submarines –Electronic (no servos) –Connects directly to Receiver Stop-full micro switch Stop-empty micro switch Trim switch

4. Buoyancy Test Plan Static Motor Strength Test (Feb 7 th ) Verify System Produces force to operate at a depth of 20m –Horizontal Load Cell Resolution: 1 lb Range: 50 lb – 400 lb Accuracy: +/- 1 lb –Expected Results: 141 lb force –Results: 11 lb force (Error due to incorrect moment arm calculation) Buoyancy Subsystem Test (Never Achieved) Verify descent and ascent rate –Antenna Marking w/ Stopwatch Range: 0 – 6 ft Resolution: 0.5 ft –Expected Results: 3.0 ft/sec –Minimum Requirement: 0.5 ft/sec Overall System Test (Never Achieved) Verify system remains neutrally buoyant at given depth –PX236 Pressure Transducer Range: 0 – 60 psi Bandwidth: 2 Hz Resolution: 0.1 psi Accuracy: +/- 1.5% –Expected Results: 3.0 ft/sec with neutral buoyancy (< 0.2 psi change) –Minimum Requirement: 0.5 ft/sec with 1 minute neutral buoyancy [1]

5. Weight Comparison (Pounds) SectionModelActualDifference Payload Tray6.37.25+0.95 Tail Assembly11.511.6+0.10 LSM Assembly4.03.125-0.88 Hull Assembly7.07.5+0.50 Nose Assembly5.05.4+0.40 TOTAL33.834.9+1.10 Neutral Buoyant Weight: 36.93 lbs