Search found 988 matches

by dirty_d
Jul 29 2017 1:43pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

Just following this thread, as I'm interested in building one. I built an electric kick scooter that is loads of fun on land, and now its on to water :D A few questions. I see that there is discussion of using a gearbox - is that to keep RPM at target or mostly due to sync issues? Is sync basically...
by dirty_d
Jul 28 2017 10:49am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

I guess this is a good first step. I think I'll worry about learning how to ride behind a boat before I start thinking too hard of about the electric propulsion.

Image
by dirty_d
Jul 25 2017 8:10am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

Is this one of you? https://www.youtube.com/watch?v=D-zdHYI_ZkI I have that same motor just laying around unused, hmm... Thanks for sharing. On his other video it shows he can't get the motor to turn under water as it immediately goes out of sync. The prop is way too big and would need to be alread...
by dirty_d
Jul 24 2017 1:56pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

Is this one of you? https://www.youtube.com/watch?v=D-zdHYI_ZkI

I have that same motor just laying around unused, hmm...
by dirty_d
Jul 18 2017 11:31am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

NolaDoogie, they almost certainly do based on the size of the propeller compared to the size of the motor housing. I really think the best way of doing this is the same as pacificmiester did. An inrunner and inline gearbox gives you a slender drive that minimizes drag, and it lets you use a larger m...
by dirty_d
Jul 13 2017 11:10am
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

I like the idea of using something like this https://www.mhz-watercraft.com/shop/en/motors/449/motor-sss-56104?c=110 direct drive to something like one of those 52mm impellers https://www.mhz-watercraft.com/shop/en/jets/504/spare-impeller-jet-52-52mm-diameter-spare-part?c=110. Cooling an in-runner i...
by dirty_d
Jul 12 2017 1:55pm
Forum: Electric Watercraft
Topic: Electric Hydrofoil/E-Foil
Replies: 463
Views: 58220

Re: Electric Hydrofoil/E-Foil

I've been toying with the idea of making one of these. I've ordered a kit from http://www.clearwaterfoils.com/ already. I'm going to just use it as a wake foil behind a boat for now. The thing that's holding me back from making an electric one is the gearbox. Even the one that pacificmeister used do...
by dirty_d
Aug 27 2014 9:37am
Forum: Motor Technology
Topic: DIY 6FET Controller help
Replies: 299
Views: 30853

Re: DIY 6FET Controller help

As far as your current limiting goes, it might be more complicated than it needs to be and not react fast enough to save the FETs from frying. Its ok to have the shunt between ground and the low side fets, because while the average voltage across it will be the average battery current, not motor cur...
by dirty_d
Aug 25 2014 7:41pm
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

I was working on a flight controller a while back. It used an STM32 Arm microcontroller eval board. I was having stability problems the last time I was working on it, so I just ended up getting the KK so I could finally just fly the damn thing :) I admit it is kinda intimidating to fly knowing how h...
by dirty_d
Aug 25 2014 7:15pm
Forum: Electric Aircraft
Topic: Quadcopter Build
Replies: 411
Views: 49277

Re: Quadcopter Build

I did some research and ended up getting the ImmersionRC Uno5800, the 600mW transmitter, and cloverleaf antennas. I found some tests online that measured the actual power output at around 750mW. I was stuck between that and the Boscam TS352 or TS353 with the RC832 receiver. Those both tested around ...
by dirty_d
Aug 18 2014 1:12pm
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

Testing out how it flies with a load, maybe 4 pounds. Nowhere near the full payload capacity. I have the KK2.1 throttle scaled to 75% and was hovering at around 50% throttle on the transmitter. It's a lot more stable than I thought it would be. https://www.youtube.com/watch?v=eIWmIzgEuOg&feature=you...
by dirty_d
Aug 13 2014 8:52pm
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

It felt really stable, maybe because of the size. I've never flown a quadcopter before, and I didn't even realize that auto-level was off the entire time. What is 42Hz filtered? The output to the ESCs?
by dirty_d
Aug 13 2014 10:31am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

I finally got around to flashing the simonk firmware to the ESCs, I went ahead and bought a KK2.1 controller as well. It works pretty damn well.

https://www.youtube.com/watch?v=XlMyax9dP8E

https://www.youtube.com/watch?v=wzRT8luIYk4
by dirty_d
Apr 14 2012 9:10am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

I've been real lazy since getting back from Vegas. I need to get this thing outside one of these days and get it tuned right.
by dirty_d
Mar 24 2012 2:52pm
Forum: General Discussion
Topic: D-drive a unique transmission system
Replies: 4
Views: 835

Re: D-drive a unique transmission system

I saw that thing before. It doesn't solve anything. You end up needing a 2nd motor with its own cvt/ivt to drive the secondary input of this device. Just someone trying to make money.
by dirty_d
Mar 23 2012 8:18am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

Well I think i have the PID code all fixed now. I could tell with my indoor test that the -D term is definitely kicking in now. I set it way too high though. Just the vibrations alone were amplified and apparent on the motor output which made it shaky and took 75% throttle to hover, it did seem to s...
by dirty_d
Mar 22 2012 10:54am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

While working on the C++ simulation I noticed that I made a mistake in my PID code on the micro-controller. The statement for calculating the D term was basically: d_term = (pv - last_pv) * dt Where it should have been: d_term = (pv - last_pv) / dt * d_weight Sure enough after changing the correspon...
by dirty_d
Mar 22 2012 8:35am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

Hmm i just read that, it said to reduce -D to reduce oscillations in stable mode. That's strange to me. Unless by reduce they mean make it more negative, but they say reduce it by -0.5, so id think they mean increase it towards 0. I'm going to try to alter my simulation a bit to try and simulate som...
by dirty_d
Mar 21 2012 8:37pm
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

You used only PI on a quadcopter or some other project? I wrote a pretty accurate simulation in c++ before I began building anything and i was unable to get the thing to stabilize without a D term. the quad would oscillate itself out of control and flip over, with a D term it was rock solid stable. ...
by dirty_d
Mar 21 2012 11:19am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

No, it doesn't respond to the input signal at the same 400Hz that its given. There is a digital impulse response low-pass filter in the ESC. But The filter is designed to work with a 50Hz input signal. When you feed it 400Hz it shifts the cutoff point upward because its based on the time between pul...
by dirty_d
Mar 21 2012 11:07am
Forum: Electric Aircraft
Topic: Flying Dutchman - is this fake?
Replies: 8
Views: 2140

Re: Flying Dutchman - is this fake?

I think it is, I don't see any motors or anything on it.
by dirty_d
Mar 21 2012 7:16am
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

Yea its uncontrollable right now. I had it up about a foot off of video for a couple seconds and it started oscillating back and forth very fast. From the physics simulation I wrote before building it, I can tell that that's either from too much P, or an ok amount of P and not enough -D. The integra...
by dirty_d
Mar 20 2012 9:24pm
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

Re: My big(15 lb) quadcopter project

Thanks. I tried my first flight today, I think I need to adjust my PID, lol. The payload should be somewhere around 15 pounds, I planned for 20 but i don't think its going to do it. Right now it weighs about 15, and it hovers at about 40% throttle.

Video:
http://www.youtube.com/watch?v=cBCbTRqPMTY
by dirty_d
Mar 19 2012 1:40pm
Forum: Electric Aircraft
Topic: My big(15 lb) quadcopter project
Replies: 25
Views: 8447

My big(15 lb) quadcopter project

I haven't been on this forum In a couple years but I thought I'd share a project I've been working on for a couple months. Its pretty much finished it last night and did a quick 1 or 2 second hover test in the living room :shock: here are the specs: 4x 5055 size 1600W 700kv motors 4x 60-70A ESCs (th...