OS FS70 brushless 24V homemade generator 100W charge test 

Very nice setup. I love seeing these custom designs.

Just found this project. Very interesting and useful, thanks. I have been doing similar but rather simpler set-ups for 'diesel'-electric model trains.

I have no idea how I got here, but this was such a cool project series... especially now that you went "hybrid" starter/generator on the BLDC motor! I was waiting to see if that'd happen. You have traits of an RC hobbyist (obvious) and electronics nut (aka electronics design engineer)... someone who's never satisfied, but keeps on "fixing" the little "quirks". I'm guessing it will NEVER be "finished"... been there, done that!

Aligning the motor shafts must be a buster.

yes, that was the idea, but the start battery was planned to be trickle charged also with a small serperate PCB CCCV board.

Sweet dude! Awesome project but how much did u pay for that electrical motor (generator here)? And does it get hot or does that cooling setup u got there do the trick to keep it cool?

no OS' usually start nicely, but i always like to use electric-start on my models as well. just goes quicker. the reason why this starts not so easy in the video, is also a contribution of the ESC actually limiting the OS in its RPM, once its running. in the transition to gen-mode, u can see that the OS now spins freely. i also think glow starts better, than ignition, but i could be wrong on that.

An interesting project, quite a useful amount of power.

Just wondering why you chose the 4-stroke over a 2-stroke. I tried this with a 2-stroke and a BLDC as a starter and it worked but I often over torque the starter and often stall the engine when I try and back off the motor. I'd be interested to talk more if you are still working on it.

Do model alternators exist? I have a FS120 4 stroke pumped model, never been in a plane just bench run a lot because I'm having trouble finding a ARF for it such as a Edge or Extra. Anyway I digress I was wondering if there are alternators for them so my plane could charge while running with say a lithium iron battery?

I'm really curious how you merged the drive to the motor? Did you use off the shelf parts or make your own?

Helluva project, nicely done!

ac or dc voltage; can you put a inverter to produce 220 v ac

great work love the electric start the coiling fan blades could fit on the outrunner trunigy motor/generator thats alreddy spinning? one less 12V component..the motor maybe designed for the open air of a plane nose, it has cooling designed in and just from its outer body spinning. Does it run hot under continuous load? Peace

can you show how did you made this and what were the electronics you had used here???

sounds like you could run multiple generators off same motor to get more watts. is homemade nitro fuel easy to make with ethanol?

So what size brushless motor did you use? And any other relevant info please.

no, i like that scale in 0:52^ how much weight that fuel that you have burned to run this very cool video xD good idea *like

great....can you tell me. how many KV your brushhles motor ?

This is probaly the coolest thing ive ever seen what size nitro is that? And also is that chargeing a 12v

what is the weight of total setup without fuel?

Good day, what model turnigy motor is this ?

you need to make the ignition battery charging while running if not already done :p

how to make constant voltage with out of BLDC motor? because difference of the voltage when you are running generator with out load and full load in very much?

Have you considered Converting that thing to GEET? I know GEET works even if not as good as a lot faking videos claim, it will get rid of the smoking and give you much longer run time with Way less gas.

Start brushless motor circuit theory is how to do?

I have a three wire, 200 kv rc motor I'm trying to use all the wires instead of just two, is that possible? Would it output more voltage using all the wires? Thanks!

its a step down. step up wouldnt make any sense to me. at idle rpm the brushless produces a good >20V so no need for that. the lower the "KV" of the brushless the higher the voltage it produces at a given rpm. u just need to be carefull with the high volts (~ 60) at higher rpm. your electronic needs to be able to handle that. my CCCV board it supposed to be very efficient. so a can convert 60V down to whatever i need. it does 0-60V output. and >20A easily depending on the cooling.

nice, how to make it?

Can you share schematics for your electronics?

Oh, that noise.

Nice! What is GAS Engine HP? and electric engine HP?

in flight trim, hmm maybe 2kg, right now its 5kg, still considerably less than any commercial generator, but I think u'd have to go turbine on that project! this little thing is still very bad on weight to power.

Only 100 watts. Given the type number it should be a 70 cc engine. it must be able to deliver up to 300 watts, 20 to 30 amps at 12 volts system. Suggestion Use a 20 amp DC motor. 70 cc engine have enough power for run a small 12 volt car alternator 15/20 amp with delay 2:1 transmission. A car alternator needs less speed 1200/1500 rpm

Hay hallo Ich bin ein Hobby Bastler mit Elektronik und alternative Energie . Ich habe ne Garage und habe ein 5000watt Blei Akku Speicher den ich mit 150 Watt solar Module auflade . Habe gelesen das du den mit Spiritus und 5% Mischöl betreibt. Ich würde mir gerne auch sowas bauen wollen und dann umbauen zu ein Mini bhkw . Würde mich über Nachrichten freuen . Zb ob Mann auch ein anderen Motor nehmen könnte der keine 500€ kostet wie den den du hast . Und was Mann am besten an Spiritus nehmen kann und Öl . Den wenn Mann kuckt ist das Recht günstig in verbraucht wenn Mann pro Std 100watt erzeugt so das Tags über solar Akkus aufladen kann und dann Nachts der Generator läuft . Über Winter habe ich leider nicht viel Strom in der Garage da alles 100% mit solar läuft nebenbei lade ich mein E-Bike damit auf . Und wollte ein Mini bhkw draus bauen der in eine Kiste kommt . Um den motor könnte Mann ne Spirale machen wir Mann Wasser durch pumpen kann als Wasser Kühlung quasie und durch ein PC Lüfter Wasser Radiator laufen lassen kann und mit PC Lüfter kühlen kann . Würde mich um Nachrichten freuen zb auf Facebook Name ist ja bekannt . LG Tom

Love your project! it's really interesting. I have a same project as yours, but it get stucked at some point. can you teach me? I'd love too if you reply this. thanks!!

This one of my old project: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5MgR_rDmecY.html

no not really, everything is flexible

Hello, you sell the project? or have some tutorial teaching do? I need a similar. help me if you can pass your email to me, I thank

cool. now make something practical

do you have one you want to sell, or do you have some plans made up to make one, thanks

u kidding that runs on nitro methane way to expensive

Hi chris.. Did you hook the CDI and ESC to the same battery terminals..?

oh... This is excellent! I've been working on a multi-rotor-hybrid project and writing a www.wikiHow.com article that I've started as a draft... I have a similar set up to yours but only using a pee wee .049 Cox engine modified to run on diesel powering a 500kv brush-less out-runner motor as the generator. Nearly the same set up as yours. Only that my goal here is to make it as light and compact as possible to regenerate a sufficient current to increase performance and longer flight time. I'll be using a 75amp ESC with the 5amp BEC cable cut off, I am still waiting on the propellers and the motors that I ordered. I have a voltage and made a voltage regulator, a current limiter and a reverse current relay soldered and connected to a CC/CV board and some RESISTORS in parallel that will protect the other components and battery while recharging in flight. I managed to find some few Lithium-ion Super CAPACITORS 2.7v 500Ferads. i'm estimating that will some connected in series will add up to continuously charge and recharge acting like a battery instead of the HEAVY and UNSTABLE LiPo's to keep the charge just enough to power the rotors. Thus, the capacitors in connected in series and rectified with some resistors in parallel will convert the A/C charge of the generator to a more smooth D/C energy charge and also act like a buffer/filter to the electromagnetic interference noise. ... very interesting indeed. so to maintain the hex-copter in hover I will at least need: 12-22volts and peak at 60+ amps give or take. so two parallel row sets of 4 Maxwell Ultra-caps each 2.7v 5000Ferads connected in series would give the capacitance/energy of about 13.5 volts and 500Ferads I thing thats about ~ 50amps

Hahaha! This is just _too fkn cool_ and a great idea! What gives me "permagrin" is the fact that it literally sounds just like a smaller version of a 2kw "campground" generator - which it _should_!

nope, sorry to dissappoint, but for that you'd have to go turbine. this design was never intended to go airborn. it weighs like 5kg and produces maybe 200W. my 1,2kg hexa needs that for a hover! but thanks for your interest. this project was more aimed for low noise and general curiosity if it was possible do build. wren turbines builds a nice turboshaft at 1,5kg with 4kW or something like that, you can just buy it!

its just a mechanical 3 - phase switch with 9 contacts to solder to. idle speed of the engine must match the esc speed for the transition to work smoothly. as of right now the project is on a hold/rethink. too much trouble with the engine. thinking of replacing it again. maybe petrol this time.

i think it's a good compination now. the brushless doesnt get hot or anything, and can pull a lot of torque on the OS, more than the OS can handle if you want. a twin cylinder engine design would be nice ;-)

Do you have a build list?

Cool thing!!! Good idea!!! You are using KA63-24L. It operating current 15-38A and peak current is 55 amp. What max value of current your generator may produce? I have a crazy idea - mount 2 your generators on my Y6 hexacopter instead of battery. It can raise 4.7 kg. Peak current consumption of my hexacopter is 100 amp.

I've been watching your developments with interest - I would love to see if you could power a quad-rotor with your genny, giving them all of the required benefits of electric motors, while giving them essentially limitless flight time. How much does it weigh, in flight trim? :) Thanks!! Franko

And also what could be done to hasten up the starting processs. Are those OS engines inherently difficult to fire up?

Hi Cafeboni this is absolutely Brilliant have you tested it over long periods of time I can think of many applications I have subscribed to your channel so please get in touch with me direct when your available

Love this low efficient methanol to electric power conversion. LOL

Is the generator you have on it right now ideal?

Did anything come of this experiment? I'm in the process of building a 5 inch gauge ride-on locomotive and this is perfect for charging a 24volt drive battery

Make one wonder if it is possible to switch fuel at full throat, to diesel to increase engine life and to reduce fuel consumption.

Awesome build! How did you size up your engine and BLDC motor prior to the build? Was it mostly trial and error or did you perform calculations? I'm building a similar device but instead the DC output will be used by a ESC to control a DC motor to run a 'hybrid' rc car.

question how do you use the brushless motor as a starter and a alternator?

mini me.

It is a good project to learn something. But using nitro fuel to charge battery is just a joke.

Nicely done. Do you have a rudimentary circuit diagram? I'm curious about that start/gen switch - is it disconnecting the 3 motor wires from the ESC and connecting them to the rectifier? If so how are you controlling 2 or 3 wires with one switch? Secondly, how does the blue button tell the brushless ESC to spin up? Do you have a servo controller feeding it a fixed throttle signal or something like that (and blue button simply supplies power or connects up signal wire to ESC)?