Recent content by Hornet dave

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...

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...

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...

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...

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

How on earth did you find that old program of mine? Must have been Google!!?! Glad to see things are working well.

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...

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...

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...

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...

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.

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

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...

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.

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...