Recent content by chuck

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...