I took material science technology in college and scored a B.
I don't remember much however. :lol: I do know though that steel will bend before failing. It makes sense then if your bike frame is compromised and it is steel it will start to steer different or rear frame failure will be noticed before a castophery.
I cant say the same for aluminum from what I studied but chromoly commonly referred to as dirty metal cant be welded and welding shops named it that. A steel frame totally makes sense. I believe the Currie frame is capable of handling a 3 to 5 kilowatt rear hub motor. It is truly a 50 mph capable bike.
However from what I have learned here on this forum I will need to change the front forks to disk brake compatible or spend the $160 and go for hydraulic up front and do the best we can do for the back.
For a six to eight or 10 kilowatt rear hub motor Sunders minimum requirements are absolute law. A downhill bike over $1,000 used or $2,000 new with hydraulic front and back. anything else would be suicide. 50 mph is fast but the structural stress wont increase by 10 or 20 % from 50 mph to 60 mph. It will be more like 60 or 70% greater stress if not more. From 50 to say 70 mph stress on the bicycle frame could increase by 200 or 300% and I would not be surprised.
In a typical racing environment such as drag racing the stress of say an 8 kilowatt motor compared to a 3 kilowatt motor would probably increase by a power of 10.
This is simply an educated guess. DA. how close am I on that guess?
A good point here however is how fast the Currie will go with a 3 kilowatt rear hub motor and remain in one piece depends on how much throttle is used upon take off. Can something really screw up with a 3 kilowatt DC motor at full throttle initially? No doubt. I can answer that.
The problem is I just don't want to go fast. I want to beat the snot out of two stroke dirt bikes and motorcycles. Four wheelers souped up also.
That's why Sunder is right when he stated what he recommended. His minimum requirements make sense under those extreme circumstances.
Under normal cruising slow easy throttle up to 50 mph on the smooth flat The Currie or Schwinn could easily accomplish that with the right hub motor.
Since the Currie don't have a motor on it right now I just figured out how I can build two fast bikes instead of two slow 20" bikes. :lol:
Not only is the original Currie rear wheel a flip flop hub but is meant for e bikes unlike a traditional regular bike flop hub. It is left threaded otherwise would not work. I think Doug told me that. If I get a 3 kilowatt hub motor for the Currie I can put the 26" Currie back wheel on the back of the 26" Schwinn and install a 48V 1,000W Unite motor on the back of that. Or I could just take the 48V Unite motor I have off the 24" bike with no brakes and put it on the back of the Schwinn with the Currie rear wheel. The huge 48V SLA pack I made and Dan's old LIPOs could work for at least a test drive.
Just a thought.
Yea I measured and cut wrong and used a nut for the extra space for the home made terminal connectors. Since it is in the bottom that is good as if it rains the water will drain out of it. That will be a future LiPo compartment anyway. SLAs are temporary. We will see how they run on this for awhile but when painted the box will look good. A lid and lock is even possible with LiPo.
Glad I listened to you guys about the brakes as I almost got killed today on the 20" bike with the 533W motor. Good thing I did not have the Schwinn with the hub motor for two reasons. #1. I probably would have been going about 5 mph faster and been completely RAN OVER! Since I was doing my sidewalk thing due to heavy traffic I was doing about 5 mph or less and on the right side of the road but on the sidewalk and crossing a side road and this asshole flew around the corner cutting me off and I hit the brakes almost colliding with it. The pot was engaged but the brakes still slowed me down enough to avoid impact.
The second reason why it was a good thing I did not have the Schwinn was he did a half circle and came out on the road I was going straight on. He hit the side road to avoid the traffic light. If I had the Schwinn I would have caught up to him when he stopped to get back on the main road. He would not have a front windshield as My huge padlock and chain would have crashed thru it. I already caught up to one asshole with the Schwinn and the hub motor. That would have been the second and last time. I don't play that shit!. What if it was a couple of kids racing to get to Taco Bell or Rite aid with their parents behind them?
Are you kidding me! Anyone who operates a 2,000lb + vehicle needs to be aware of their surroundings. What happened was DEAD WRONG and I was actually sad I did I not really hurt somebody or that truck today. If it was a female driver I would only beat up the truck. If it were a dude though it could have been curtains for him. Looking for a truck anyway. We know a truck can do it but kind of fun to see if I could drag some asshole down the road with an e bike and a chain around his neck. :lol:
Afterwards I went to Home Depot and took a safer more well lit way home instead of the same route back in pitch dark where I wiped out with the Schwinn hitting the broken off section of the roads shoulder about a year ago I think. I took the long way home as Supertramp sings and went over 6 miles and the 16 AH pack was well above 3.7V. The new LiPo packs are doing well. I need to blow the dust off the packs Dan sent when I build the 24" 48V 1,000W bike to test it when I get the 65T spoke kit from Kings Custom Sprockets. :lol: Thanks.
LC. out.
Am I wrong?
