relax.it just me that think 17 is old. besides, i don't have many time left. so 17 is "old" to me.

Let's get Kickin' ...whatever that means

points to the topic

A just ruler amongst tyrants

Quote from lambchopsil

points to the topic

oh.ok. back to the topic. i still need to know what do you all thinks about lithium-ion polymer battery.
we need somebody to draw up the frame. don't want it to look like crap.
wheels...... can't use fiber glass, that for sure.lol
i'm stinks at compiling.

so, kuoru, how's your engine coming? my crew disbanded, too crazy they said. well, looks like we'll be counting on your friction engine design.

edit

lithium-ion polymer battery probably the best choice for power source(if the friction engine doesn't work which i was hoping it will work). it's lighter....
ahh, to lazy to write. i just put something from wikipedia for you guys.

from wikipedia:

Cells sold today as polymer batteries have a different design from the older lithium-ion cells. Unlike lithium-ion cylindrical, or prismatic cells, which have a rigid metal case, polymer cells have a flexible, foil-type (polymer laminate) case, but they still contain organic solvent. The main difference between commercial polymer and lithium-ion cells is that in the latter the rigid case presses the electrodes and the separator onto each other, whereas in polymer cells this external pressure is not required because the electrode sheets and the separator sheets are laminated onto each other.

Since no metal battery cell casing is needed, the battery can be lighter and it can be specifically shaped to fit the device it will power. Because of the denser packaging without intercell spacing between cylindrical cells and the lack of metal casing, the energy density of Li-poly batteries is over 20% higher than that of a classical Li-ion battery and approximately three times better than NiCd and NiMH batteries.

The voltage of a Li-poly cell varies from about 2.7 V (discharged) to about 4.23 V (fully charged), and Li-poly cells have to be protected from overcharge by limiting the applied voltage to no more than 4.235 V per cell used in a series combination. Overcharging a Li-poly battery will likely result in explosion and/or fire. During discharge on load, the load has to be removed as soon as the voltage drops below approximately 3.0 V per cell (used in a series combination), or else the battery will subsequently no longer accept a full charge and may experience problems holding voltage under load.

Early in its development, lithium polymer technology had problems with internal resistance. Other challenges include longer charge times and slower maximum discharge rates compared to more mature technologies. Li-Po batteries typically require more than an hour for a full charge. Recent design improvements have increased maximum discharge currents from two times to 15 or even 30 times the cell capacity (discharge rate in amps, cell capacity in amp-hours). In March 2005 Toshiba announced a new design offering a much faster (about 1-3 minutes) rate of charge. These cells have yet to reach the market but should have a dramatic effect on the power tool and electric vehicle industries, and a major effect on consumer electronics; especially electrically powered model aircraft.

When compared to the lithium-ion battery, Li-poly has a greater life cycle degradation rate. However, in recent years, manufacturers have been declaring upwards of 500 charge-discharge cycles before the capacity drops to 80% (see Sanyo). Another variant of Li-poly cells, the "thin film rechargeable lithium battery", has been shown to provide more than 10,000 cycles.

Let's get Kickin' ...whatever that means

well Lightning, the friction idea, i thought it could work aswell, but it will be heavy to more them, tho i still think that it could be possible if someway we could make it be light to move in the start and when you (by yourself) have gotten up some speed that u transform the mass friction to the engine so it might move u then. but i also still looking into that plan on the Spool engine, with magnetic fields and so on, still it cant move u if ur standing still, but im not looking for a engine that will move u from a deadpoint, but rather an engine that can give u some sort of boost when ur already up at high speed, since the mass to move will be easier for the engine if its already going towards the right direction. Am i wrong?

edit it could be smart if maybe u took that project Lightning since ur team dispanded, and think about the friction idea and go into details, so i can concentrate more on the spool engine.

The new version of sierra

Quote from Kuorakatsu

well Lightning, the friction idea, i thought it could work aswell, but it will be heavy to more them, tho i still think that it could be possible if someway we could make it be light to move in the start and when you (by yourself) have gotten up some speed that u transform the mass friction to the engine so it might move u then. but i also still looking into that plan on the Spool engine, with magnetic fields and so on, still it cant move u if ur standing still, but im not looking for a engine that will move u from a deadpoint, but rather an engine that can give u some sort of boost when ur already up at high speed, since the mass to move will be easier for the engine if its already going towards the right direction. Am i wrong?

edit it could be smart if maybe u took that project Lightning since ur team dispanded, and think about the friction idea and go into details, so i can concentrate more on the spool engine.

well, that you gotta ask dancwart. he's good at physics, me, i stank at it. but personally, i do think friction engine could work.

my crew disbanded, so i got no one to work with me here. now i'm recruiting engineer student to see if they're interested. i'm ove-optimistic with this project. lol

Let's get Kickin' ...whatever that means

Quote from lightning90

i'm ove-optimistic with this project. lol

We sure have seen that...

Ok, well dancwart do u dare to work on the friction engine 😕

edit Ok guys, i think i've found fact, everyone knows that a bigger wheel will go faster then a small wheel right?
thats why speed inlines have really really big wheels, the rotation will be bigger, so i was riding today to control my area with my Parts War team, and found out that if we enlarge our wheels its bound to go faster then normal aggressive inlines just with ourselves skating without an engine, so if we just could find a engine that can give us a boost during skating it will be far more efficient then normal aggressive inlines. HAH thats something u guys must aggree on, i have just forgotten to count that in the calculations. at least i think im right ^^

The new version of sierra

Quote from Kuorakatsu

Ok, well dancwart do u dare to work on the friction engine 😕

the friction engine works using the inertia of an object to move another with it. now which one do you think has a bigger mass: the skate or you?
if i understood what you mean for "friction engine" i can assure you that you can't drive AT's with it, cause to speed something up that way you need

1. a bigger mass in the engine that in the AT= the at reach the speed of the engine

2. a really fast spinning engine with little mass= the engine slow down but transfer a little speed to the AT. the max speed of the engine can't be reached by running tho, you'd need some kind of extern motor.

3. a really little rider <_<

in a nutshell: the friction engine stores up energy while you push the toy car and release it later to keep it running, but you can't accelerate, nor there is a way to store that much energy in the mass of a AT.

Quote from dancwart

Quote from Kuorakatsu

Ok, well dancwart do u dare to work on the friction engine 😕

the friction engine works using the inertia of an object to move another with it. now which one do you think has a bigger mass: the skate or you?
if i understood what you mean for "friction engine" i can assure you that you can't drive AT's with it, cause to speed something up that way you need

1. a bigger mass in the engine that in the AT= the at reach the speed of the engine

2. a really fast spinning engine with little mass= the engine slow down but transfer a little speed to the AT. the max speed of the engine can't be reached by running tho, you'd need some kind of extern motor.

3. a really little rider <_<

in a nutshell: the friction engine stores up energy while you push the toy car and release it later to keep it running, but you can't accelerate, nor there is a way to store that much energy in the mass of a AT.

then we got that clear lol. 😔

The new version of sierra

hmmm so is there another type of motor one could use? If we could get our hands on one capable of doing some, if not all of our requirements then I think I may have a way that could possibly power it. I tried doing a schematic but have absolutely no clue at what i was doing.
I'll try to explain best I can:
-on both sides of the skates have a slot for a compartment possibly 2-3 inches tall, and 10 inches long (assuming the boot would be sized at 10 1/2-11) that could be inserted and screwed with bolts to secure it. Inside these compartments could be placed maybe flat motors of sorts (most likely would have to be custom made), or maybe a power source, but let's assume both had these motor inside. (double motors for more power; power could either be distributed like right compartment powers front wheel, left compartment the back wheel, or find a way to disperse power to both wheels from both motor compartments)
-on the back of the boot, have another attachable compartment say, 5-6in tall (depends on how tall boot is), 2.5in wide, and 4-5in long from left to right. (i'm sure one would be concerned about whether or not this compartment would just out from the sides, but there would be a sunken area where it can be attached like the side compartments) In this compartment could be stored the power source, maybe those lithium-ion polymer batteries could be stored in here, in bulk depending on just how small they are. This compartment would be detachable and could be replaced (say this project did take off even if it took a couple year's time, another way profit could be made would be buy selling these battery-storage compartments) once batteries died after however long their life would be. Just a rough idea that i had for a little while, critique it if you see fit.
edit
Ah also, here's some links to the pics of in-wheel motors:
http://www.megawattmotorworks.com/articles/05/aug/motordiagram.jpg
http://www.gizmag.com/go/4031/picture/10885/
if it could be downsized drastically, and constantly improved maybe it could be sufficient?

As u said u would try as hard as u can to explain, but im pretty retarded so i understand most of it, but its hard to picture me the AT is it possible to try to draw a pic or something, and the inside wheel engine is GREAT i could really think that would work or i even think it MUST work, but the big problem here is to resize it, if we just could put one of those inside wheel motors apart and have a look at all the parts that it is made of, and try resizing it and customize it to fit a wheel for an AT and remember that an AT wheel is ALOT bigger and broader then a normal inline skate wheel, especially an aggressive wheel.
edit i found this aswell thanks to u Achilles, http://www.tm4.com/eng/tm4transport/moto_wheelmotor/
this works good as a schematic for us, since if u scroll down u can see a pic that will give u lots of information about the parts.

The new version of sierra

Well just to clear things up I'll try to acquire Photoshop and see if i can get a pic going for you guys using the already Photoshopped AT on page 11 or 12. Well I read that in the show they used an in-wheel motor on wikipedia, so i figured if the motors actually exist why not try and use them. I'm going to get to work on getting that Photoshop and finish that up.

Quote from achilles

Well just to clear things up I'll try to acquire Photoshop and see if i can get a pic going for you guys using the already Photoshopped AT on page 11 or 12. Well I read that in the show they used an in-wheel motor on wikipedia, so i figured if the motors actually exist why not try and use them. I'm going to get to work on getting that Photoshop and finish that up.

I can send you the layered PSD if you want. The one on that page is very low res.

Life is tough......but it's tougher if you're stupid.
[img]http://img.userbars.pl/69/13603.gif[/img]

Actually that wouldn't be too bad at all, if you wouldn't mind could you do so?

hello guys. sorry for not posting for quite a while.

looks like we don't have to build in-wheel motor since they already existed. just need to fine motor that small enough right? do you think there's any website that made custom engine/motor? if there is, we can ask for small sized in-wheel motor.

still no reply about the battery. no matter, if the friction engine works, we wont need a battery,am i right?

do you think we could combine in-wheel motor with friction engine? just a thought btw.

Let's get Kickin' ...whatever that means