gwhy

There will always be a place for the IC engine when electric vehicle are the norm, but I think I have to correct you on this a electric motor can always out perform IC motor ( but there are a few items that do need to be addressed and normally it becomes a compromise ). The reason the lap time was only 98 at the Manx GP was because due to the compromise of distance over battery capacity . The sprint record for a e-bike is just under 60mph in about 13 seconds the sprint record for a e-motorcycle is 169mph in a tad under 8 secs . Electric bikes do make a noise its just different. Battery's are getting smaller, lighter and have a higher power density also the prices are coming down. there are lots of chemistry configurations for cells, there is also rumours that nuclear cells will soon be available for high power apps , nuclear cells have been around for a while but in very small low power form ( I dont like the thought of this ). Dont get me wrong im not a tree hugger but going electric is a positive step to help promote motorcycle sport, It will also enable people to practice almost anywhere they want to ( as regards trials ). Also Just think while waitin at a section rather than blipping the throttle, you can have a cd player on your bike and play your favourite party hits cd at full blast while you wait.

Hopefully it wont be to much longer

I know what you mean about the sound, But as you say it is more than likely bikes will go electric. A bike with no sound will and do seem strange to ride, but do have big advantages as to where you can ride it. Dependent on what motors is used they do actually make some sound which will give you a different sort of grin ( its called the E-grin :-) ). It will be different but I think there will be a place for them. Thanks for this, So based on this Im guessing then rolling chassis weighs in at approx 40kg. I have worked out the weight for all the electrics with enough battery capacity to give a running range of about 5 miles of EXTREME riding and it will weigh in at a little under 20kg with all wires, connectors and water proofing . This setup will make the bike perform as well as a 250/300 production gas trials bike. The problem is the cost for the amount of batterys needed to push the 40kg chassis. I would guestimate a minimum of 2 battery packs would be needed for a club trial 3 to be on the safe side and at the current cost of the battery's that I would like to use that's a cost of about

The blog will on this site, wouldn't start one anywhere else. There is a lot of knowledge and riding experience to tap into on this forum that can make this happen.

Thanks for the swing arm length and motor weight thats something for me to start thinking about. When I have decided which way Im going to go with this I will start a blog on the progress for a prototype. I already have most of the stuff to put together the power unit just got to sort out the frame side of things. I know a 93 Mont rolling chassis weights in at about 43kg which is way to heavy, I'm looking at a rolling chassis of no more than 35kg (30kg or less would be a defonate ) if I am to use an existing production bike rolling chassis.

Yes this is what I have been playing with, they are very powerful , very light and tiny and another bonus is they are very reasonable in price.

Here is a very nice electric conversion along the lines that I will try to achive with 2 motors but in a trials bike. The motors used in this conversion are large and very heavy but only put out very small power ( about 4hp total for both motors). The motors that I plan on using are about the size of a coke can and produce 8hp'ish for each motor and is a third of the weight, also the battery's used in this conversion are sla's which again are very heavy and large newer battery technology enables third of the size/weight with the same power out. I need frame specs before I can go any further with this.. come on guys :-)

In need of some more information please. As Sunday's trials and the weekend play time is nearly over I thought there maybe some people taking there engines out of there bikes for maintenance over the coming week. I would be very grateful if someone could tell me the weight of there bikes without the engine fitted or just the weight of there engine. The complete weight setup of electric motors/controller and battery's that I would like to replace the IC engine weighs in at approx 13kg and produces 16hp or add another 2kg for a additional 8hp. I am going back over the numbers to see what will be the overall weight if this electric power plant setup is fitted into a existing trials bike. Thanks in advance.

I totally agree with every thing you have said, I have a few contacts ( movers and shakers) but I will not even approach them until I have a bike that can really cut it with a production gas bike which I believe is possible. Yes I have put a lot of thought into transmissions/clutches, multiple gears may not be necessary due to the power of the motors I plan to use as long as the range of the throttle can be switched on the fly ( there will have to be a reduction gear from the motors as the spin upto 10000+ rpm) , the clutch is a tricky one Im not planning on having a true clutch but having a electronic control that can mimic a clutch, again this will very much depend on how well the motors perform in the custom built frame. I am doing this for fun ( hobby ) but I would love to have a sell-able product at the end of it. I will have to see how it goes I have all the parts to make a prototype except a frame. I can see you ride with the kingswood club I have ridden a couple of trials that they have run. I know what a bike should be capable of and in what conditions so I know what Im aiming for. I am from a electronics background and building a speed controller specifically for use on a e-trials bike which will be a first as far as I know. Just need some specs now so a colleague of mine to get started on a frame.

I thought I will put up some links to exsiting e-trial bike conversions someone may find them interesting: http://www.planetetrial.com/articles.php?lng=en&pg=9917 http://www.mototrial.net/cutenews/show_new...=&template= http://www.planetetrial.com/articles.php?lng=fr&pg=12984 http://www.forster-elektro-trial.de/home/d...1-prototyp.html

The ETek is a very good motor and used alot for various motorcycle conversions but it is very heavy and not very efficient the agni is a better motor ( more robust ) but still very heavy Im planning on going a completely different route by using 2 maybe 3 very small ( in size and weight ) but powerfull brushless motors 3 motors will produce about 26hp (and still be lighter and slightly smaller than a ETek) which is more than enough for a trials bike. Im hoping to get away with 2 motors max ( 18hp ) geared for around 25-30mph. The mont in the post a little ways up is a very nice conversion but again is very heavy and with all the trials bike conversions that I have seen and read about they all appear to lack the punch factor that you get from a gas engine and Im sure this is due to the weight. I have also put a fare bit of thought into the controller side of things that it will be possible to program the controller to mimic engine braking and also mimic a clutch ( the controller is in development ).

it would be the easiest route to take but they are to heavy to begin with. The Denali is ok but still using a big heavy motor and heavy sla battery's so the frame/wheels isnt really upto the job/weight, my thinking is if a custom frame can be made to take advantage of much better battery chemistry's and also using a motor that is even more powerfull but only a third of the size and weight. With a prodution frame you will need a monster motor and monster battery's to really push that extra weight around its a catch 22. Im looking for a complete bike weight of about 30kg Im not sure how heavy the Denali is but its not very powerfull. Im looking to have a bike that will produce the power of a 250/270 ice bike.

evo would be good cheers, at the moment I am just looking for the length of the swing arm from the centre of the back axle to the center if the swing arm pivot through the frame. The beta web site do give some specs like ground clearance,seat height and wheel base which is all good info but no mention about swingarm length. I would like to be able to make a frame with basically the same geo of a production bike if possible.

Hiya everyone, I thought I would start here on this forum ( as I used to be a member about 3 years ago and always found the members to be very helpful). I am looking for some help in finding some dimensions of various trials bikes ( beta is my preference ). I no longer have a bike but when I did ride I thought the beta suited my riding style a little better than all the other makes I owned . For the last year I have been looking into the concept of making a electric trials bike ( like the oset baby bikes but full size ) I know others have converted production bikes to electric but the motors and battery's that are used are very heavy . I think it would be possible to make a bike half the weight ( using a different approach in type of motor/battery's used) of a gas trials bike but with the same/similar power and with quick swap battery packs but would require a custom frame, hence Thats why Im back on this forum. At the moment I am looking at the swing arm as a starting point for the frame and would very much like anyone can tell me the length from swing arm pivot to rear wheel axle. Any help would be appreciated. If anyone is intrested in the progress or has any questions/suggestions then fire away. Thanks.