cwah
100 MW
Do you mean the Dahon speed would not fit?
Do you know if I can buy your bike model in UK?
Do you know if I can buy your bike model in UK?
Set a new speed record tonight, 55MPH GPS Verified
- Thread starter zombiess
- Start date
jawshnitzel
10 mW
- Joined
- Mar 28, 2010
- Messages
- 29
just a note on the 20" RST shocks... i use a set on my gravity bike. very rough roads here. hit potholes regularely at 40mph. rally hard on rims... ha ha ha
anyhow, same problem with the spring rate. too soft. SOOOOO, i pulled the little plug at the top, and made some custom washers with a grinder to fit inside the tube. shimmed them up 3-4 washers thickness in each shock tube.
this helped a bunch!!!!! easy to tune to the right stiffness this way.
shnitz
anyhow, same problem with the spring rate. too soft. SOOOOO, i pulled the little plug at the top, and made some custom washers with a grinder to fit inside the tube. shimmed them up 3-4 washers thickness in each shock tube.
this helped a bunch!!!!! easy to tune to the right stiffness this way.
shnitz
Doctorbass
100 GW
To do 100kmh, on my giant, the system must be able to sustain 8-10kW.
And.. what is like magic is that the motor top at 120 celsius and doesn't increase!!.. the efficiency curve make it in the right spot on the efficiency curve around 100kmh.
A motor that is too fast will have a bemf speed too high and the controlelr wil not reach the optimum power for the desired speed.
When i say you needd VOLT, KV and CURRENT ( POWER) to reach very high speed it's totally true!
if you have too fast motor you will burn the controller or motor before you reach the desired 100kmh.
The 5303 on 24" wheel at 10kW is known to do the 100km/h... and even 113km/h GPS :wink:
Doc
And.. what is like magic is that the motor top at 120 celsius and doesn't increase!!.. the efficiency curve make it in the right spot on the efficiency curve around 100kmh.
A motor that is too fast will have a bemf speed too high and the controlelr wil not reach the optimum power for the desired speed.
When i say you needd VOLT, KV and CURRENT ( POWER) to reach very high speed it's totally true!
if you have too fast motor you will burn the controller or motor before you reach the desired 100kmh.
The 5303 on 24" wheel at 10kW is known to do the 100km/h... and even 113km/h GPS :wink:
Doc
zombiess
10 MW
Doctorbass said:
I know what you mean, but if you go to the ebikes.ca simulator and punch in a 149V 12AH battery pack .05 ohm resistance custom controller with 60A battery draw, 20" wheel, race bike and 116kg, you'll see that I should be able to hit 100KM/H. So far this simulator has been almost exactly perfect for me. Now, I'm not going to try that on this 9c 2806 because I don't want to stress the FET's by running them 0.5V from their max ratings, that's just silly, I'm just saying I'm pretty sure I could get this little 9C to to do it since I now know of a few mods to allow the 18FET IRFB4115 controller to live at a constant 80-100A battery draw
But just as anyone can see, to gain that extra 12 kph/5mph to go from 88kph/55mph to 100kph/63mph it takes some serious boost in power. The motor wants an to go from 47 phase amps to 58 phase amps at top speed. Consumption also jumps from 86Wh/mile to 112WH/mile which will make A LOT more heat, but it would just be a quick burst. This is why I'm changing motors. No need to fry it when I found the perfect operating range for it. A 2806 in a 20" wheel ventilated and kept under 125V can be a real monster to contend with.The Mighty Volt
1 MW
jawshnitzel said:
Did you fit your own stem to those RST forks?
One thing I was planning to do was to change my front wheel from 20" to 16", and then get some very stiff forks with a 24" designation, so as to minimize the alterations made to the overall rake or the angle of the bike.
I like everything the way it is now....if I keep a 20" wheel however, and then add suspension, the front of the bike rides too high for my liking and low-speed handling quality decreases.
Another thought I had was that "less" might actually be "more" when it comes to the front suspension. Instead of going with expensive sophisticated forks, why not go for cheap forks with heavy springs and very stiff stanchion tubes??? Don't forget that the fork doesn't just have to absorb shocks, it has to resist flexing under heavy breaking with the added weight.
