waynebergman
100 kW
Thanks Oatnet...........that frame could make a nice Boardtrack style bike with a springer style set of forks, drop down handle bars and a retro saddle. Maybe a nice motor battery combo like on Juicer 2's rig.
oatnet said:The improvement in handling will surprise you.
You don't like the looks? After a lot of positive feedback, -JD
Gordo said:oatnet said:The improvement in handling will surprise you.
You don't like the looks?
That rig is so ugly the only hope is to paint the entire bike PINK with some daisy's on the box.
hillzofvalp said:Yeah.. If it floats your boat great.. Bt I couldn't do the front pack.
hillzofvalp said:Yeah.. If it floats your boat great.. Bt I couldn't do the front pack.
Alan B said:hillzofvalp said:Yeah.. If it floats your boat great.. Bt I couldn't do the front pack.
Before you say that you should either try it or do the research on it.
Read the bicycle dynamics thread. Some surprises in there.
Center of mass location
The farther forward (closer to front wheel) the center of mass of the combined bike and rider, the less the front wheel has to move laterally in order to maintain balance. Conversely, the further back (closer to the rear wheel) the center of mass is located, the more front wheel lateral movement or bike forward motion will be required to regain balance. This can be noticeable on long-wheelbase recumbents and choppers. It can also be an issue for touring bikes with a heavy load of gear over or even behind the rear wheel.[19] Mass over the rear wheel can be more easily controlled if it is lower than mass over the front wheel.[10]
A bike is also an example of an inverted pendulum. Just as a broomstick is easier to balance than a pencil, a tall bike (with a high center of mass) can be easier to balance when ridden than a low one because its lean rate will be slower.[20] However, a rider can have the opposite impression of a bike when it is stationary. A top-heavy bike can require more effort to keep upright, when stopped in traffic for example, than a bike which is just as tall but with a lower center of mass.
The precise answer depends on many factors. The weight of your wheel, tire, battery, case and mount, but also the DISTANCE from the center of the forks to the center of the weight. The further you push the center of weight forward, the more pronounced the effect on handling. It is the old "lever arm" from school physics vs gyro effect of the front wheel being dependent on rotating mass. The speed on a bicycle where the top heavy feeling goes away will be different for each setup. Heavy cruiser motor bikes take a lot more effort on the counter steer than light race bikes. Likewise the speed where the top heavy effect goes away is higher than the race bike.waynebergman said:I guess what I am getting at is say you are just going super slow say 2 miles an hour trials style, is this going to make the top feel top heavy like it would when you are stopped at a traffic light. I am guessing there is a certain speed that starts to work in ones favour for the top heavy feeling to disappear. It sounds like a moot point but I am curious. By the way I am on board with this. Picture attached of my efforts for up front mount.
I have been re-reading this thread and would just add that the sloshing fuel is worse than dead weight, particularly until the fuel gets down to where it is isolated on both sides of the tank. And it is not a problemoatnet said:Mass is mass whether it is in a Pelican box or in the front end, they both rotate around the axis easily. Frankly, the gyroscopic effects are harder to overcome than the mass. People have been using front baskets for heavy loads for years, and after 5-6 front-pack builds I think rotation is a non-issue.
High COG: Take a look at these KTM gas tanks. They mount the "dead weight" at the same height as one of my front-mounted packs, as close to the fork as they can cram it. -JD
nomad85 said:Any good ideas on how to do a front battery mount on non triple crown suspension forks that don't involve welding/machining? Big zip ties?
Great job on your boxes oatnet!
oatnet said:I'm so disappointed I renamed the thread.
Last I talked with Accountant, his order of (100) motors was going to be a mix of 9kv and 13kv so I could get a 13kv, with a 17kv for Doc. Today he reports the order will be (2) 13kv for Zombiess and Dr. Bass, and (98) more of the awkward 9kv motors. :| :? Nobody buying these 9kv motors is going to get the 13kv high-speed performance reported by the Italian guy, so I hope Accountant will be able to sell them and place a 3rd order. I am skeptical, so I put ???????? in this thread's title instead. Well, last time the 13kv motors we bought turned out to be 9kv motors, maybe we'll get lucky and this time the 9kv motors will actually turn out to be 13kv.
Anyhow, that leaves me without at hub motor that can keep up with the x5403. I'll keep searching, maybe John in CR will be able to bring his motors to market. Until then, this will be a x5403 build thread looking for another fast hubby!
-JD
nomad85 said:Any good ideas on how to do a front battery mount on non triple crown suspension forks that don't involve welding/machining? Big zip ties?
Great job on your boxes oatnet!