A prototype is a preliminary model of something. Projects that offer physical products need to show backers documentation of a working prototype. This gallery features photos, videos, and other visual documentation that will give backers a sense of what’s been accomplished so far and what’s left to do. Though the development process can vary for each project, these are the stages we typically see:
Proof of Concept
Explorations that test ideas and functionality.
Demonstrates the functionality of the final product, but looks different.
Looks like the final product, but is not functional.
Appearance and function match the final product, but is made with different manufacturing methods.
Appearance, function, and manufacturing methods match the final product.
JackRabbit's DNA expresses everything you want in personal mobility:
Light - Less than 20 lb...easy for anyone to carry
Compact - Folding footrests and rotating stem reduce stowage space requirements
Simple - Minimalist design enhances reliability. No chain or shifters to break or adjust
Nimble - Only 4 feet from head to tail makes for agile handling in mixed traffic situations
Fast & Frugal - 18 mph top speed. 13 mile average on a single charge (Auxiliary battery pack in the works)
Strong - Aluminum monocoque frame handles riders up to 240 lb
Big Wheels - Large wheels with fat tires are more stable and roll smoothly with more traction over any terrain. More versatile than a scooter or skateboard
Threaded socket plug on underside of the MF for recharging main battery and auxiliary battery parallel connection
4-LED on top of the MF indicating state of battery charge (100%-75%-50%-25%)
USB port mounted in the top of the MF for recharging/powering personal devices (5V, 1A)
36 volt Brushless DC hub motor with Hall sensor
Rotor ALNICO number = 16
2640 motor rpm (13.2:1 reduction)
330 max output watts @ 10 amps @ full charge (42V)
18 mph max speed on level ground with 160 lb. rider
Toggling the master bezel switch under the MF powers the system.
Plugging the 3-position speed switch into its handlebar cradle enables operations.
In this state when the speed switch is rocked up to the “CRUISE” position the controller allows 5 amps to flow from the battery to the motor. When the switch is rocked down to the “CLIMB” position the controller allows 10 amps of current to flow from the battery to the motor. When the switch is released it defaults to the middle “COAST” position and no power flows through the system--increasing JackRabbit's range.
When the speed switch is removed from its cradle power flow from the battery to the motor is disabled.
Threadless alloy fork with caged-bearing headset and rotation-dampened limiter
32-spoke radially-laced 20” front wheel with 1.5” NEXO (no-flat) tire
Folding alloy footrests attached to the fork blades. 60 lb. load limit--no standing
Threadless 2-piece stem w/QR for rotation and/or removal of its extension
520mm wide riser handlebars with 110 mm grips
Right-hand brake lever actuating V-brakes on the rear wheel
Double-wall, 36-spoke rear wheel with 26” x 1.95” tire/tube and anti-puncture liner
27.2 x 300mm alloy seat post; black
Lycra-covered saddle; black
BATTERY PACK RANGE ASSUMPTIONS:
The battery pack consists of ten Samsung or LG lithium-ion 21700 cells wired to a Battery Management System which balances each cell's charging and discharging to ensure safe operation and a long service life. The pack stores 4.8 amp-hours of energy. With an average discharge voltage of 36V, the pack can deliver 173 watts of power for one hour (4.8 x 36).
How does this relate to range? First, it is important to understand that all motors are not 100% efficient. JackRabbit's motor takes in 173 watts, but only delivers 138 watts to the rear wheel. With 138 watts (Cruise Mode) a 160 lb rider on a flat road will go 16.4 miles in one hour (one charge cycle). If the road was a constant 3% uphill, the 160 lb. rider would travel only 9.3 miles (in Climb Mode) on a single charge.
Not all routes are flat or constantly uphill. On our one mile undulating paved circuit which includes 12% and 10% inclines our 160 lb. test rider traveled 13 miles in 65 minutes by CRUISing the flats, COASTing the downhills and CLIMBing the incline sections. You can estimate your speed and range at: http://www.bikecalculator.com/
Until we roll out our Dark Matter Propulsion system JackRabbit is helplessly constrained by these laws of Newtonian physics.
HUMAN POWER OPTION:
JackRabbit is the only 21st century vehicle that offers a 19th century mode of operation. So, if you want to add some elbow grease to your commute or help up a steep hill simply stride with you legs while most of your body weight is supported by the saddle. Better yet, put one foot on the fork rest and push it like a 20th century skateboard with the other. Alternate legs as needed. You can easily sustain 6 mph on the flats. Why not? You can't get any greener!
SAFE OPERATION PRACTICES:
Although most states don't require a helmet for riders 18 years and older, we strongly recommend donning protective headgear (more robust than a top hat) for riders of all ages.
Because JackRabbit lacks "fully operable pedals" it is technically not a bicycle as defined in Federal Regulations. Because it also lacks a "deck to stand on while riding," it is technically not a "scooter." JackRabbit best fits under "Class 2 e-bike" regulations in most states. As such, it does not require a license, registration, insurance or minimum age to be ridden on bike paths or on roadways where the maximum speed limit is 25 mph.
Learning to ride JackRabbit is easy. The saddle height can be adjusted from 26" to 33" above the ground. The lower the better. Start out on a flat road with both feet on the ground. Push the top of the speed control switch with your left thumb and JackRabbit will slowly start to move. Release your thumb anytime to let yourself coast. Experience steering turns without your feet on the folding footrests. Once you get a feel for JackRabbit's handling characteristics put your feet on the rests while going in a straight line at a slow speed. Gradually introduce steering to sense how your feet and legs react. Most experienced cyclists will need to "unlearn" using their feet. It might take a minute or so to let your legs just ride along and follow your steering hands. Remember, you can quickly and easily put both feet on the ground at any time. This is something you can't do on a bike, so it's not an instinctive reaction and may take practice.
Given JackRabbit's compact size and short wheelbase we don't recommend coasting faster than 18 mph (29 kph). Besides, going fast around pedestrians can be dangerous on any vehicle. Unlike traditional bikes and skateboards, JackRabbit can stop safely by applying the rear brake and--if need be--putting both feet on the ground. Please be courteous of others as you exercise your mobility rights!
Video sound track: "Chance" by Kai Engel. Under the Creative Commons Attribution 4.0 International (CC BY 4.0) license:
Risks and challenges
All of our sub-system partners are large, established manufacturers. They have already delivered prototypes produced to our engineering specifications. Our campaign goal will finance their minimum volume requirements. Production will be completed in roughly two months. Surface shipping to our California facility will take one month. One month has been budgeted for assembly, testing and packing for distribution to backers. Typical ground shipping service is one week. (Air shipping to Hawaiian and Alaskan backers will take less than a week.)
We have decided to extend our offering only to USA backers. This decision frees us from the complexities of international shipping and tax regulations. We prefer to focus our energies on executing and delivering JackRabbits to fellow citizens by mid-December of this year.
Premium black anodized aluminum drink holder with laser-etched JackRabbit trademark logo. Tapered, foam-lined throat holds cups up to 3" in diameter. Mounts securely to handlebars. Weighs less than 70 grams. INCLUDED with Fully-Accessorized Jack Rabbit
Backup control switch if the original is misplaced. Includes fob that can be attached to a key ring. Proprietary design--only available in conjunction with Rewards #4-9. INCLUDED with Fully-Accessorized JackRabbit.
Save $100 (33% off $299 MSRP) 4.8 Amp-hour external battery pack doubles JackRabbit's range. Securely Velcros to main frame section and plugs into the charging port in a parallel circuit. Includes it's own 2.5 amp charger. Shipped with Rewards #4-#9, only to Continental USA.
Save $350 (35% off $999 MSRP).
Includes extra speed control switch with fob, cup holder, phone cradle, rear cargo rack, USB rechargeable front and rear lights, bell and shipping to 48 States. Hawaiian and Alaskan backers please add $200