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  1. H

    Crazy "Batman" Winch Question...

    Dunno if you are still checking in on this thread but.... A few things to consider (myself having built a brushless winch for rc gliders): 1) The ESC will blow up if you try to start motor with a significant tension on the rope. 2) Not sure what you have in mind after the 30' ride up, but the...
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    Formula E championship starts today!

    What can i say, im a sprint car fan. I like 10 minute races and i despise "fuel strategies". Wingless would be a good idea. Heck, i noticed a few rear wings were set pretty much flat. They didnt seem to be cornering fast enough for wings to make a difference at that track. Streamliners would...
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    Formula E championship starts today!

    I really dont think fans will get behind silent racing . Other lthan the crash at the end, it had all the excitement of a golf cart parade. They need to do a few things, such as make more noise, shorten the race so it has no element of battery conservation, eliminate all the spec car rules, then...
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    Aerodynamics

    Im guessing most ebikers are sitting in a mostly upright position for comfort purposes. Also, im guessing ebikers as a whole tend to go at faster speeds than your normal commuter or recreational rider. That would mean ebikers would have more aero drag from the riders torso than other types of...
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    Starting to get pissed at the bike situation

    BFSSFG is brutal. Quite entertaining but brutal. Ive been happy with my bikes direct purchase (not a kilo tt). Id buy from them again.
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    Arduino PID current limiter values

    How on earth did you find that old program of mine? Must have been Google!!?! Glad to see things are working well.
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    Next 10 years. What's your outlook on multirotors/drones

    I dont see passenger carrying multicopters becoming a commercial reality anytime soon. The failure mode analysis would drive some very significant design changes from how they appear today. Certification rules would first need to be developed, then met, and thats a long process. Ballistic...
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    Arduino PID current limiter values

    Two pid routines would also work fine im sure. However, you would not sum the outputs, but rather use the most restrictive of the two. If you plot the phase current limited current and maximum battery current against throttle output to esc, you would find that below a certain throttle %, phase...
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    Arduino PID current limiter values

    If im reading things right, your pid routine compares Sensor vs PID_Setting and the result is used to reduce the throttle as needed. It would have taken me 3x the lines of code to do the same thing but my senility is a different topic. I think you are going to want to control BOTH battery...
  10. H

    Arduino PID current limiter values

    Yep im familiar with rc esc's, having blown a few up over the years. Phase currents are an issue at high load and partial throttle. RC aircraft esc's are designed to handle their rated current only at full throttle (100% pwm duty cycle), and below full throttle, their current limits decrease at...
  11. H

    Arduino PID current limiter values

    I didnt notice phase current being limited at all in either sets of code. If you have battery current and a throttle signal to the esc, you have enough info to fudge a phase current calculation.
  12. H

    Aero Windscreen becoming accepted?

    Making a one off mini fairing should be pretty easy. Fiberglass over foam. Heck, lost foam would work too.
  13. H

    Manned electric "quadracopter" takes flight!

    Nope. It is supposed to have a parachute, but it will always have that "dead zone" like that other IC jet pack from NZ, i.e., when you are high enough to die from the fall but not high enough for the parachute to save you. Next up will be some sort of emergency levitation system so you can get...
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    Isle of Man movie from 2010

    I watched it a few nites ago. It was a good quality production and very entertaining. Of course, i will watch anything thats related to the IOM, i have nothing but the utmost respect for those riders.
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    KDE Brushless Outrunner, 5.5KW continuous 12KW Peak

    I am a heli expert (or experienced hobbyist lets say) and yep theres a few things to consider: Elec helis typically fly for 5 minutes at a time, afterward the motors are hot (180f is common) Avg power for 700 size heli (biggest you normally see, at 11-12 lbs rtf or 5-6 kg im guessing) is around...
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    Big brushless tech

    Dont forget lots of input caps compared to a typical r/c hobby esc that drives a propeller.
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    Would this motor work for an ebike build?

    On an RC heli application, I designed and had Shapeways fabricate a centrifugal fan for the outrunner motor. It isn't terribly difficult to do if you have a 3D cad program, it's actually a fun project to get your toes wet with mechanical design. I'm guessing it would cost about $30 for Shapeways...
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    Big brushless tech

    Fighter cat racing dot com would be my guess.
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    Phase current limiting interface for RC esc

    Moderate success! I've got the interface seemingly working as desired, but I won't have a chance to give it a real-world test until spring. I'll scribble up a circuit diagram in the next day or two, but the code i'll post here right now. First I need to explain my application a little. I'm...
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    House Burned down from RC LiPo Fire

    I just checked out a bunch of lipo fire videos on youtube. Interesting for sure! One was an ammo box that was sealed pretty well. It exploded in a quite spectacular manner. Of the lipo bags, some seemed to contain the flames pretty well, others seemed to shoot flames out of the flap. Perhaps...
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    House Burned down from RC LiPo Fire

    http://www.rcgroups.com/forums/showthread.php?t=719116&highlight=lipo+bunker&page=20 Dont forget that the fumes from a lipo fire are nasty, you dont want them in your house and nothing will really contain them. Also, for the size batteries you guys are using on ebikes, you will need to do some...
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    House Burned down from RC LiPo Fire

    From the description he wrote, it sounds like there was nothing that would contain the blaze. When lipos blaze, they shoot out fire in a quite phenominal manner. The battery bunkers come in three varieties, one is a cloth bag (im guessing nomex?) that would simply keep the flames from shooting...
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    House Burned down from RC LiPo Fire

    Unfortunately this is not terribly uncommon in the RC world. Lousy chargers, bad batteries, folks using the wrong charge settings, they all add up to kaboom!
  24. H

    EDF powered jet bike...

    Those are going to have probably 1.5 lbs of thrust each. But they would sure SOUND like you are going 100 mph. Also, the usual caveat, the propulsive efficiency would outright stink. The fun would start when you get up to the 90+ mm electric ducted fans, i think they are good for 10+ lbs of...
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    Phase current limiting interface for RC esc

    The parts have arrived. The SMD chip was easy to solder, the arduino is super easy to use and program, i got one of those dlux 120 hv escs to dedicate to the project, now i just need for it to fast forward to April for some good weather. Im chipping away at the code, ill give it a shot with...
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