10 febbraio 2014

Cafè Racer Ibrida (200cc + 30Kw)

Prima versione con doppio motore nella culla del telaio
John Gustafson un bel giorno da appassionato motociclista ha deciso che voleva una moto ibrida. Nel 2002 ha visto in TV una eCicle ed ha deciso che avrebbe intrapreso quella strada. Nel 2006 ha iniziato i lavori partendo da un CB750K del 1978 che ha opportunamente smontato e rivisto per ospitare nella culla un piccolo monocilindrico da 200cc ed un motore elettrico da 1200Watt. Dopo i primi test evidentemente non così soddisfacenti, e due motori nella culla non essendo in ingegnere elettronico il buon John ha optato per un cambio radicale. Nel 2010 ha comprato un motore/mozzo della Enertrac (http://www.enertrac.net/) e lo ha piazzato sulla ruota posteriore al posto del vecchio freno a tamburo. Con l'operazione ha ottenuto più potenza, una centralina programmabile e per non guastare anche un freno a disco posteriore. La moto può viaggiare sia in modalità full electric, sia a motore, sia in modalità combinata (la più interessante a mio avviso) permettendo al buon John di consumare come una 200 ed avere le prestazioni di un 500 con tutti i vantaggi della doppia alimentazione in termini di autonomia e/o restrizioni del traffico.

Versione definitiva con motore sul mozzo posteriore

Versione definitiva con motore sul mozzo posteriore


"When I decided to build a bike, (February 2006), I decided that i wanted to see if I could make a bike with large displacement performance, and small displacement economy. Prior to this build, I had zero experience in building a complete bike. I had no prior experience in electric vehicles (slot cars not included) and I had no idea what the engine, motor, controller, or batteries needed to be. I did however have a picture in my head as to what I envisioned it to be.

My first stop was to see how others on the internet were building electric bikes and go from there. Most of what I saw was discouraging. Huge low power batteries with limited range, hanging out of an overburdened frame. Not something I wanted to see in my bike. I then started researching businesses on the web that sold the various components for an electric bike. There is a lot out there, but most are not suited for the Hybrid Application. I will discuss this later.

So, I took a leap of faith and asked a close friend if he had an old bike he'd be willing to donate for this cause. He dropped off a very beat up 1978 Honda CB750K.

Next, I decided to take a leap of faith and decided to just buy a few small components and try them out to see they would work. The one I chose was a 200 cc Hensim Chinese engine. I also purchased a 1200w motor and a matching controller."

Update II
"My original idea was to build a gas/electric cafe racer that would be unrecognizable to the average person viewing it. It would appear to be just another nice bike. My final attempt was made possible by stumbling into the site for the Enertrac Hubmotor. This is a high voltage, low current device that has LOTS of power…it is also one of the more expensive units available. Purchase of one comes with the full engineering back-up and support of the company. This I can attest to! As they had never before or since applied this to a hybrid design, they were keen on seeing how it would work. I must say, it works nicely.
I spent most of the time on the third version of this bike in repackaging the components. The hub motor appears to the casual observer as a drum brake…and most assume it is because of its size. They always seem to ignore the rear disc brake…
The controller sits beneath the seat, making it centrally located for running cables to and from it. The batteries are hidden beneath the fuel tank, which was professionally modified, and pressure tested before being put into service. This is what gives the bike the empty frame Cafe Racer appearance. The bike weighs in around 325 pounds, so its not too heavy, and the little engine does a pretty good job of keeping it running at speed.
The electric motor is used mainly for accelerating from a stop and also for hill climbing. It gives an additional 40 hp to the bike, but also a huge boost in torque. The controller is fully programable and can tailor the performance of the bike dramatically. "


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