I think I would be wearing a helmet flying that one.

@ericornhag1615

3 жыл бұрын

I don’t think a helmet would protect enough you on that thing

@alastorclark3492

2 жыл бұрын

Lmao because the helmet is ganna stop those blades XD

What a great achievement Oskar. Good on you for persevering to this point. Loved your great article written for KiwiFlyer. Hoping this develops into an exciting and possibly lucrative venture for you. Subbed and keen to follow your progress here on YT.

Man I love this. You could scale up an Align Trex 700 and have a killer 20 minute flight. Performance out the wahzoo!

Forgot to mention what an awesome display of engineering and EV possibilities. Well done!

Awesome tail rotor.. great job

Great job Oskar. It immediately reminded me the recently presented Bell 429 EDAT. Can't wait to see more videos of your helicopter. Greetings from Poland!

@OskarRDA

3 жыл бұрын

You can now read the full story about this helicopter at www.hfpower.co.nz/Oskacopter.pdf

Very cool, I'll take two please!

Brilliant. well done! must be so nice not to have the horrible 2 stroke engine vibrations and torque spikes.

@OskarRDA

3 жыл бұрын

Not having the noise is even better!

With the proof of concept that an electric motor works, you could use a small engine generator to run it. That should really reduce maintenance costs and if your engine gives out go to the market and buy a new one.... well provided you live after the landing. Might still consider a battery pack with enough power to let you land. Scale the concept up to Sikorsky CH-53K territory.

Amazing job dude, but it seems highly dangerous to have your head uncovered

Wow, FULL electric AND electric tail rotor? Didn't see that coming

Excellent film footage and sound.

I would wear a juggernaut suit... just in case

Nice! Flying into the news!

Holy fast take off. You could probably take off in less than 20 seconds from the motor starting

@OskarRDA

2 жыл бұрын

That was the first flight, now that everything is dialled in it takes less than 10 seconds from blades starting to turn to getting airborne.

bro think he is in rust😂

Weirdest tail rotor I've ever seen... but an amazing test. Total control, no big vibrations, excellent. I must say I was a bit skeptical at the beginning of the video :)

@dmitrydolgikh8854

2 жыл бұрын

question is - how long it works on battery

@dmitrydolgikh8854

2 жыл бұрын

oh, I found it - 15 mins... ridiculous

Interesting... an independent rudder.

This is so awesome, something I was dreaming of doing! Is there a weight advantage switching to the electric drive tail rotor(s)?

@OskarRDA

3 жыл бұрын

I removed 8.1kg and added 7.5kg. The best bit is that the 7.5kg included the tail rotor battery!!

@codmott286

3 жыл бұрын

if anything it adds a lot of redundancy.

@johnosmers4374

3 жыл бұрын

You can program in collective yaw too!

@codmott286

3 жыл бұрын

@@johnosmers4374 really, so you can just climb and descend all you want with no pedal input?

Excellent. Why not use a small engine for the main and electric on the back? Then you can have all the automatic stablization on it.

we no weve come far when a battry can lift us off the floor bikes can travle 40 to 50 mile off a little bat pack..its insane

Are the tail motors gyro stabilized or are you controlling the motors with only the pedals?

@OskarRDA

3 жыл бұрын

There's no gyro, but there is feed forward control similar to a throttle correlator. If the main rotor torque increases the controller automatically increases tail rotor thrust.

@OskarRDA

3 жыл бұрын

You can now read the full story about this helicopter at www.hfpower.co.nz/Oskacopter.pdf

Please what's the battery capacity , what type of motor did you use and what power does it draw?

Es un comienzo, vale, pero ¿pruebas sin casco? si las palas tocan el suelo o con algo, re revuelve como una peonza loca y ¡¡¡se abre la cabeza!!!

Something tells me if you had the funding and resources, you'd be able to make a larger scale version of this aircraft....

Hi oskar, You mentioned it consumed 21kw, upon checking the specs for that 228 motor designed for 109kw the graph puts 21kw at 60nm of torque. do you think this motor is too big? could you have used the smaller motor continuous rated for 41kw and 80nm torque, with a peak of 68kw & 140nm ?

@OskarRDA

2 жыл бұрын

I run a LC (liquid cooled only) motor at 2450rpm. At that speed maximum continuous power is about 27kW. Hover power is 21kW, but I program the peak power at 29kW. After reading the cooling small print you will find that the EMRAX 228 is just about perfect for this application.

@primitiveseo9824

2 жыл бұрын

@@OskarRDA Max continuous flying power for your 230kg load at 27kw at 2450rpm was 84NM of torque. a rotor speed of 540rpm. that's a continuous lift to weight ratio of 2.73NM/KG. Hover power at 21kw at 1850rpm is 63NM with a rotor speed of 408rpm. A hover lift to weight ratio of 3.65NM/KG Considering the 228 motor has a continuous rated torque to power rate of 180NM of torque at 60kw. Assuming the helicopter was empty to hover it would use approx 41nm of torque and 14kw at 1250rpm. at 150kg. During hover you use 35% of its torque and 47% continuously. Even factoring a further 2% loss for running the motor at 5000rpm. There's still 50% of motor rated power and torque. You could double the main cog and increase the continuous speed and flight time.

@bradsamers3014

Жыл бұрын

@@OskarRDA Hi Oskar , what did the 228 motor and speed controller cost ?

Did you manage to compare the torque ratio between the electric main motor vs the Rotax Petrol Engine. Ever think about a hybrid design using battery / electric tail rotor and a petrol engine to increase time and range? The alternator can also assist in providing some charge to the tail rotor batteries.

@OskarRDA

2 жыл бұрын

On paper the petrol engine has more power and torque. In real life the electric flies much nicer, so nice that I never want to fly petrol again. A hybrid solution will be too heavy.

@colincrafford

2 жыл бұрын

@@OskarRDA Now to get more mileage out of the batteries, is your next challenge, thanks for replying

awesome but no enclosed cockpit is fucking terrifying LOL

@OskarRDA

3 жыл бұрын

Only terrifying if you're watching on YT. Flying it is AWESOME!!!

it only takes 30 seconds to lift......amazing....

Damn.. Any details of how you change the pitch of the blades? Is this a traditional swashplate? I think i've got what it takes to make one of these kicking around

@OskarRDA

3 жыл бұрын

The cyclic and collective controls are standard Mosquito, I didn't touch those.

great work man, what are the components needed?

@OskarRDA

2 жыл бұрын

Thanks, you can read all about it at www.hfpower.co.nz/Oskacopter.pdf

The biggest question of all what is the endurance?

@OskarRDA

3 жыл бұрын

Hover power is 21kW and the batteries are 7.8kWh. That works out to 22 minutes of hover time. Hopefully power goes down lots above translational lift, still have to measure that.

Fantastic, was that an Aussie accent I heard at the start?

@leuvenisaplace

3 жыл бұрын

Sounded like someone with Dutch or German as mothertongue speaking English, but the landscape and the sky look like NZ. Other videos feature waste/recycling bins from a company in Auckland, where there is more than a handful of South Africans.

Fantastic. It's amazing how fast the rotor heat spools up to speed. As of now what weight category would your helicopter fit in ? Also is that a cog tooth belt being used ? Thank you ...

@OskarRDA

3 жыл бұрын

The secondary reduction uses a toothed belt, it is standard Mosquito from Composite FX. The aircraft is registered in New Zealand as a microlight. Aircraft with one or two seats that have a MTOW or less than 600kg can be registered as microlight over here.

@raydreamer7566

3 жыл бұрын

@@OskarRDAThank you for the reply. Mosquito rotor blades I thought would be hard to get. Keep up the good work I will be watching.

🔥🔥🔥🔥

Really interested to know the specs for the motor, controller, batteries etc if you have time.

@OskarRDA

3 жыл бұрын

Have a look at www.hfpower.co.nz/Oskacopter.pdf

Huge congratulations! What a success! Why do the tail rotors all spin at different speeds?

@OskarRDA

3 жыл бұрын

Thanks, the same signal goes to all the motors but each one has its own controller. Must be slight variances in the controllers.

@GabrielDeVault

3 жыл бұрын

@@OskarRDA well you proved it works with only 4 of the rotors spinning!

@alexjohnward

3 жыл бұрын

@@GabrielDeVault that is just an artifact of the camera shutter, they are all spinning I think.

hahaha bravo guys! Less warm up than a turbine!

Good. Love this.

Buy this man a helmet?

You know those Mosquito guys don’t sell ultralight choppers anymore. You have to go experimental if you want to deal with them. Not sure what you have to do if you want spare parts.

@OskarRDA

3 жыл бұрын

In New Zealand every aircraft needs to be registered with CAA, the one in the video is ZK-IAB. Plus you need a current helicopter license to fly it.

Wow

Tail rotors

I take it a single electric motor turning a "stock" tail rotor wouldn't do the trick? Excellent job., BTW. Edit: Never mind. I see the answer a bit down the line. :-)

How does the cyclic control work? I can't see any control mechanisms going up to the blades.

@OskarRDA

3 жыл бұрын

The control rods and swashplate are inside the mast. It's a very well engineered system, all the Mosquito helicopters have it.

@TheBillzilla

3 жыл бұрын

@@OskarRDA - Thanks. I could see a small mechanism sticking up from the top of the hub, but I wasn't sure if that was it.

Hi Oskar - fabulous man - i have been thinking about buying this kid and convert it to electric flying - but I am no engineer and would love to know what king of electric motor I would need - the requiered horsepower - batterypack - tailrotor motor (s) why so many - why not just one ?? ect ect. love to hear from you . Q: Is john Uptogrove still alive or not??Thanks for sharing this . Rudi

@OskarRDA

3 жыл бұрын

Hi Rudi, You will find the answers to all your questions and more in the comments of the "Electric helicopter with electric tail rotor testing" video in this channel. John is unfortunately not with us any more.

@OskarRDA

3 жыл бұрын

You can now read the full story about this helicopter at www.hfpower.co.nz/Oskacopter.pdf

WTF Anticouple rear motors .. they need more power than the main rotor

Definitely an interesting tail setup. Wonder what kind of endurance it has? Was that it?

@OskarRDA

3 жыл бұрын

For the main rotor: Hover power is 21kW and the batteries are 7.8kWh. That works out to 22 minutes of hover time. Hopefully power goes down lots above translational lift, still have to measure that. For the tail rotor: During tethered tests the tail power was 1.2kW with the tail battery good for about 25 minutes. In untethered test it was found that left pedal turns can require more than 2kW, under those conditions the tail rotor battery will need to be a bit bigger to get the same endurance as the main rotor battery.

@Intrepid175a

3 жыл бұрын

@@OskarRDA - thanks for the info. It's very interesting. I wouldn't have thought of having a separate battery for the tail but I don't think it's a bad idea. I think I would want the tail to last longer than the main rotor. That brings up another question. You're obviously using rotor rpm to control lift on the tail rotor. Will the motors reverse themselves if needed? I'm thinking of an autorotation situation where there's no torque to take the nose opposite of the main rotor direction. Also, and this is just out of curiosity, but what voltage levels are you using when fully charged? I fly electric powered RC helicopters using a 12 cell Lipo battery pack that's at 50.4 volts when fully charged, only those models are only good for 5 to 8 minutes of flight time, depending on how we're flying it, but we're going things you 1:1 scale guys can only dream of. ;-)

@OskarRDA

3 жыл бұрын

@@Intrepid175a I've experimeted with tail reversing, but first tests are without to see how necessary it is. Check out the video on simulated engine out in the hover. Tail battery is 6S, main 96S.

@Intrepid175a

3 жыл бұрын

@@OskarRDA - I found your short video doing the throttle chop in a low hover. There was a nice little left yaw going on in spite of the pilot standing on the right peddle. I'd have to see how that works out coming down from altitude. I've flown models that didn't drive the tail rotor in an autorotation so the tail stops turning very shortly after the power is cut. If you're nose to the wind it's not too bad. On a relatively calm day, the nose starts swing in the direction of rotor rotation about half way through the flare and there's nothing the pilot can do about it. In the modeling world, it's not that big a deal most of the time but on a 1:1 scale bird??

@OskarRDA

3 жыл бұрын

​@@Intrepid175a You're right, I've also done lots of 3D RC heli flying with freewheeling tail and auto touchdowns are a bit more tricky. From the perspective of the guy sitting in the seat of the 1:1, so far I haven't found anything that feels uncontrollable or uncomfortable. When initially testing tail motor reversal the cons outweighed the pros, might have to revisit at some stage but suspect it won't be necessary.

What's your tail end there buddy

Please use safety gear

do all of the tail rotors work collectively?

@OskarRDA

3 жыл бұрын

You can read the full story at www.hfpower.co.nz/Oskacopter.pdf

That's is a great mod but we need to wait a little more for a new Generation batteries that will give us more flight time. Then I will convert my heli to electric.

@OskarRDA

3 жыл бұрын

I got tired of waiting so decided to have some fun now ;)

A helmet would of put the onboard weight too high.

wow....

Is there a sprag clutch on the main rotor?

@OskarRDA

3 жыл бұрын

Yes, it uses the standard Mosquito sprag clutch.

I like it but why not only have one tail rotor?

@OskarRDA

3 жыл бұрын

It's for redundancy. The helicopter will fly with only 4 tail motors running, so loosing one or two is a non event.

@jamessnelling

3 жыл бұрын

@@OskarRDA would an empennage not reduce the need for redundancy and decrease drag?

@OskarRDA

3 жыл бұрын

@@jamessnelling I'll let someone else build one of those, thought about it but ended up putting it into the "too hard" basket.

Como se puede conseguir uno como es. Gracias

It's photoshop! Great job!

@flamu9183

3 жыл бұрын

Prove it.

At least you can autorotate this one unlike the drone VTOL machines.

@OskarRDA

3 жыл бұрын

And it will auto even better than before because the main rotor no longer needs to drive the tail rotor in an auto.

@grevis101

3 жыл бұрын

@@OskarRDA That one will be a very interesting test. I reckon the conventional auto on my machine has a descent of about 1350fpm, what was the air like before in its autos?

@OskarRDA

3 жыл бұрын

​@@grevis101 The bit in the middle is not as interesting as the start and the finish. That is where you don't want anything slowing down the rotors unnecessarily. For the middle bit the math says that saving 1400W (which the mechanical tail rotor was robbing at zero thrust) means reducing the decent rate by 120fpm.

@grevis101

3 жыл бұрын

@@OskarRDA Another question, full right pedal on the original tail rotor had a little bit of negative pitch, has your setup got reverse on the tail drone controllers

@OskarRDA

3 жыл бұрын

@@grevis101 Have experimented with both. The technicalities are very interesting, much too complex to explain in a KZread comment.

I hope it can record some battery fire before dozens of people die in those stupid Uber aiire taxis trying to use lipos ....if lithium doesn't catch fire then tell me why ..glider pilot 35 years and I've had plenty of electrics ....solid state batteries are the only way but we don't have that yet ...

@OskarRDA

3 жыл бұрын

You're right, the batteries are very dangerous. In this helicopter the battery management and monitoring system cost just as much as the battery, for me it's the most important piece of equipment on board.

I'll take one and pay with cash. I'm serious. Send me info.

@OskarRDA

3 жыл бұрын

At the moment there is only one in the world, and it is being used for test flights. But it's just a question of time before they become freely available.

@OskarRDA

3 жыл бұрын

You can now read the whole story of the helicopter at www.hfpower.co.nz/Oskacopter.pdf

It won't work.

@OskarRDA

2 жыл бұрын

I'm very curious to hear why it won't work.

3 people thumbing this down.. How?

It's not very good.

Please what's the battery capacity , what type of motor did you use and what power does it draw?

@OskarRDA

3 жыл бұрын

The motor is an EMRAX 228. The battery capacity is 7.8kWh. When hovering the power required is 21kW, so the battery will last 7.8/21 hours = 22 minutes. When flying just above ETL (about 20km/h) the power required is 17kW, so the battery will last 7.8/17 hours = 27 minutes.

@agwe9378

3 жыл бұрын

Thanks Mr. Oscar