1. analogies
1.1. Scissor lift
1.2. Leg
1.3. Slingshot ride at the fair
1.4. old radio antenna
1.5. Railgun
1.6. Piston
1.7. Batting Machine for pitching balls
1.8. conveyor for bowling balls
1.9. Lego
1.10. hot wheels launcher
1.11. dolly
1.12. cleats
1.13. aircraft carrier
1.14. Aerosonde launcher
1.15. Crossbow
1.16. Potato gun
1.17. pumpkin cannon
1.18. skeet shooting
1.19. bunny hill tow rope
2. Material Selection
2.1. steel
2.2. titanium
2.3. aluminum
2.4. wood/ wood composite
2.5. plastic
3. power source
3.1. Electric
3.1.1. Battery
3.1.2. Extension cable
3.1.2.1. compatible
3.1.2.1.1. European
3.1.2.1.2. United States
3.2. Compressed air
3.2.1. Precompressed
3.2.2. Mechanical compressor
3.3. Hydraulic
3.4. Solar
3.5. manual
3.6. gas powered
3.6.1. generator
3.7. mechanical
3.7.1. spring
3.8. hand crank
3.9. Lawnmower
3.10. nuclear
4. Timing
4.1. Mechanical
4.2. controlled
4.2.1. bang bang controller
5. Portability
5.1. carry handles
5.2. Foldable
5.2.1. briefcase
5.2.2. backpack
5.2.3. duffel bag
5.3. light weight
5.4. wheels/ locking
5.4.1. studded wheels/ picks into ice
5.4.2. removable wheels
5.5. remote controlled
5.5.1. secondary motor
5.5.2. drive system
5.6. incorporate dolly system into design
5.7. modular
5.8. telescoping
6. Safety features
6.1. sensor
6.1.1. proximity
6.2. 2 button switch
6.3. Lockout mechanism
6.4. key
6.5. password protected
6.6. All clear
6.6.1. button
6.6.2. switch
6.7. finger print scanner
6.7.1. eye
6.8. count down timer to launch
6.8.1. beeps
6.8.2. numbers
7. Weather Resistance
7.1. oil treatment
7.2. ziplock
7.3. gaskets
7.4. corrosion resistant
7.5. welds
7.6. tight tolerances
7.7. non-porous
7.8. internal heating
8. Mount mechanism
8.1. Bobsled
8.1.1. Magnet
8.1.2. Steel
8.1.3. hook/release hinge
8.1.4. velcro
8.1.5. rubberized clamp
8.1.6. Click on
8.1.7. Suction cup
8.1.8. adjustable
8.1.9. Mount that cups the back of the sleds - no sled modification needed
8.1.9.1. cradle
8.1.10. vacuum suction
8.2. Track
8.2.1. Bolt on starting block
8.2.2. Melt ice/refreeze
8.2.2.1. Pegs
8.2.3. Pressure on sidewalls
8.2.4. Ice picks
8.2.5. Studded wheels/ picks into ice
8.2.6. Leveling/centering mechanism
8.2.7. clamp to start block
8.2.7.1. spring
8.2.7.2. vice
8.2.8. aggressive texture
8.2.9. additional weight
9. Propulsion
9.1. Giant Rubber Band...
9.2. Electro-Magnet
9.2.1. linear induction motor
9.3. Drive-Chain/Gear System
9.4. wheel powered launch (wheels on both sides of bobsled)
9.5. pressurized fluid
9.6. linear actuator
9.6.1. hydraulic cylinder
9.6.2. Air compressed plunger
9.6.3. spring loaded
9.7. Falling mass
9.8. Springpowered lever
9.9. Rocket power
9.10. ramp
9.11. sliding track
9.12. Pulley cable system
9.12.1. towed by drone
9.12.2. electric spool
9.12.3. rotational tow line