Search results

Date Relevance Most replies

  1. C

    zzzt, wow what a trip

    Jeremy, Are you discussing the unite motor?,, The scott motor was the motor used on many winning electrathons until the eteks took over. There are still teams competing with the scott motors. The scott 1 hp motor that was on my bike was used for about 8000 miles, at its design rating with no...
  2. C

    zzzt, wow what a trip

    Recumpence Again, I don't know what these other engineer's said, it will never be relevant to me or to Jawnn. The context is what I said in my posts to Jawnn, and it applies to Jawnn. One of Jawnns parameters was long life. My parameter is safety. I sacrificed a lot to get my education. I had...
  3. C

    zzzt, wow what a trip

    John, When I posted on your welding aluminum thread I was'nt familiar with your vehicle. I saw a picture of a blue bike, I don't even know what motor you use. I just did a quick web search on dc brushless motors. Appears to me that brushless hub motors are wound in series, and have similar...
  4. C

    zzzt, wow what a trip

    John, I steered Jawnn away from brushless dc motors, 3 phase, due to cost/benefit. Perhaps a 5% increase in efficiency at double the cost. Put the money in batteries and get a doubling of the range, not a 5% increase in range. It has been 30 years since I took any physics, I once was very...
  5. C

    zzzt, wow what a trip

    Jeremy, Jeremy, a permanent magnet brushed series wound motor has a peak efficiency at a given applied voltage. Let's just throw out a scott 1 hp motor at 24 volts which is about 82% efficient at 3000 rpm . I have the KTA services performance chart and there are many charts for this motor on...
  6. C

    zzzt, wow what a trip

    Recumpence, Do you feel Jawnn can use bicycle chain, accelerating from 0 tp 15 mph up a 16% grade, with a load of 550 lbs on board, and expect this bicycle chain to last? I can, if you wish, calculate the tension on the chain in this scenario. Bicycle chain is not constructed the same as the...
  7. C

    zzzt, wow what a trip

    Wow, I am the person who was helping Jawnn. First, if you read any of Jawnn's posts you will see that he edits many of his posts after replies have been made. This makes it somewhat difficult to follow the thread correctly. Actually somewhat confusing. If I made errors, point them out to me...
  8. C

    Modifying heat treated AL alloy

    John, The American Society of Metals Handbooks are, here in the States, generally recognized as the authoritiy on welding. I am a 30 year off and on member of the AWS (American Welding Society). Certified at various times in a wide array of welding. I have never smaw aluminum that I remember...
  9. C

    Modifying heat treated AL alloy

    At work today I welded some 6061 T6. Went into the office and talked to our companies sole mechanical engineer. We looked up filler metals for 6061. 5356 cannot be heat treated. Interesting, heat treating 5356 causes stress corrosion cracking in the weld. I did not know this. As a filler 5356...
  10. C

    Modifying heat treated AL alloy

    Good John, glad that helped. If I welded it, and it was just to be used as a bicycle, I don't see a problem not heat treating it. But then, I have been migging and tigging for 32 years, a lot of practical experiance doing this. Gordo, Vancouver Island eh? I did an internet search, metal heat...
  11. C

    Modifying heat treated AL alloy

    Sometimes it is nice to know things, to make an informed decision. So, I looked it up. From the American Society of Metals Source Book on Heat Treating Vol II Production and Engineering practices 2nd printing, 1977 Pages (366-368) "It may be desirable to anneal an alloy from any other initial...
  12. C

    Modifying heat treated AL alloy

    This is a pretty comprensive guide to welding 6061 in the T6 condition. There is a chart of the haz that shows the resulting strength of the 6061 T6 in the post welded condition. Read page 8, 9 and 10. http://www.lincolnelectric.com/assets/en_US/Products/literature/C8100.pdf Read carefully the...
  13. C

    High torque velomobile

    Jawnn, Re-reading some of your musings on previous posts. You feel that it is incredible that you could build a trike that goes up steep hills at 20 mph. It is not incredible, it is very doable. With absolutely no pedaling, ever. For the loads and hills you encounter, a 12 volt system at 20...
  14. C

    High torque velomobile

    Jawnn, The weak link in the above scenario is the battery size. I am not comfortable running a battery at its maximum c rating. Connectors get dirty, increasing their resistance, resistance creates heat, then you blow a battery terminal. Throw the battery away. It is trash. As amp hour capacity...
  15. C

    High torque velomobile

    distance, 12 miles x 5280 feet = 63360 feet weight, 520 pounds Maximum slope, 2.7/24 = .1125 Net change in elevation, 280 feet estimated frontal area, 5 square feet, still do not know what vehicle. estimated coefficient of rolling resistance, .0055 velocity, 20mph x 88/60 = 29.3 feet/second The...
  16. C

    High torque velomobile

    No, higher voltages are not more efficient. 12 volts x 100 amps is 1200 watts. Watts is power. 24 volts x 50 amps is 1200 watts. There is no efficiency gain or loss by changing the voltage. On series wound motors, changing the voltage changes the speed of the motor. More poles slows the speed of...
  17. C

    High torque velomobile

    Jawnn, The 909 motor will give you the power you need at 12 volts. The 12 volt 60 amp hour thundersky battery will give you the power you need. The alltrax controller will give you the power you need. I do not know what other people are telling you, can you link me to these discussions? The 909...
  18. C

    High torque velomobile

    Jawnn, You said forget the budget,,,does this mean unlimited budget, or, a thousand dollars is not enough? Forget the delta trikes? Does this mean you are building a tadpole, or you will electrify your current delta? 12 volts vs 24 volts. With the 909 motor. About 30 feet/sec, up a 10%...
  19. C

    High torque velomobile

    Jawnn, 12 volts will power the bike at the speeds and hills you want to ride. It is the amp hours you listed above that is lacking at 12 volts A 12 volt 60 amp hour battery will supply the same power and range as a 24 volt 30 amp hour battery and a 36 volt 20 amp hour battery. A 3.5 inch 3vx...
  20. C

    High torque velomobile

    Jawnn, Multiply your measurements in inches by 25.4 to get millimeters. Your axle is probably a 20 millimeter shaft with a 6 millimeter keyway. The 15 mph using a 17 tooth driver and a 72 tooth driven is cruising speed. The vehicle will travel faster, but the motors efficiency will plummet...
  21. C

    High torque velomobile

    Jawnn, Remember, the battery supplies the power. A 20 amp hour thundersky will not provide the power you need for hill climbing. The amp hour rating is a energy content rate. This means that this battery will supply 20 amps for one hour. Four 20 amp hour cells wired in series makes a nominal (...
  22. C

    High torque velomobile

    Jawnn, I understand about your bad knees, arthritic back and carpal tunnel. This is why I think something similar to what I built may work for you. If it is legal, then even better. I have a big fat motorcycle seat on mine. Very comfy. Aftermarket Harley seat, cost $65 Front and rear...
  23. C

    High torque velomobile

    Now Jawnn, With the restrictions you have placed on your ability to charge your battery, a lead battery is not really a good choice. Here is why. Lead is finnicky. It must be completely charged after each use. Even with high charge rates the length of time to balance a lead battery is still...
  24. C

    High torque velomobile

    Jawnn, fuse http://www.cloudelectric.com/product_p/fu-mega250.htm contactor http://www.cloudelectric.com/product_p/sw-20257-7.htm pre charge resistor http://www.cloudelectric.com/product_p/rs-kit-pcr-220.htm throttle, many here, if possible, the twist grip magura has lasted me probably...
  25. C

    High torque velomobile

    OK Jawnn, I think that trike in the previous post is just a little beyond my capabilities, but, you win the lottery and buy one for me too. This is for a 12 volt system, the drivetrain parts need to be #40 chain. The motor sprocket parts, 17 tooth for #40 chain...
Back
Top