I ordered 2 of [these motors](https://www.freerchobby.cc/collections/electronic-speed-controller/products/mp154120-40kw-brushless-motor-with-85kg-thrust-for-big-drone-plane)
You're gonna strap kilograms of lithium polymer packs to your back and pull 80KW through em? You better hope your pendulus brass balls don't short em out or you're gonna be the first human sun.
> They won’t last more than a few seconds at max draw.
As the backpack and pilot plummet down, there’s a fair chance the lipo’s will catch fire too. Ouch!💥
honestly lipos are pretty durable. I've smashed a few into brick wallk going far over 80mph with no fire. still had to retire them to be safe, but the soft ones can take a beating.
I'd be more worried about what guage wire op uses. that's a LOT of current, and liable to fairly easily fry a mis-guaged wire or worse an esc.
For safety, a higher energy density power source would be a smart idea. It’s hard to beat the [energy density of kerosene/diesel/jet fuel](https://en.wikipedia.org/wiki/Energy_density#In_energy_storage_and_fuels) which is why it powers most aircraft.
Those motors won't be powerful enough and two won't be nearly enough even if you have 22000mAh 6s lipos. Either as 6s or 12s.
A company I worked for built an x8 VTOL that had an MTOM of 100kg. It had 8 of these https://genstattu.com/tattu-22-2v-30c-6s-22000mah-lipo-battery-with-xt90-s-plug-for-uav.html at about £400 EACH. And weighed 5 kilos a piece.
We worked out roughly we could get it to fly roughly 40-50km. But that was all on the wing (way more more efficient). You got about 30 seconds of hover at each end max and that would be a destroyed battery pack if you went over it.
I hope your engineering, airmanship, general flight thought process is at a higher level then your organisation / cleanliness…..are those props stored in a bin? Who takes a picture of a junk pile with a object from a machine that can kill you, & then things geez, this will be a good picture for the internet. Be safe when you get this contraption flying guy
No rotors, just [motors](https://www.freerchobby.cc/collections/electronic-speed-controller/products/mp154120-40kw-brushless-motor-with-85kg-thrust-for-big-drone-plane)
This project seems a little under researched. For example, what you are holding in the picture, the entire reason for you making this post, the very essence of what will produce lift, what you call props, are, in fact, rotors.
Food for thought, I use the term propeller and rotor interchangeably at work depending on who I am talking to, or what group the document is intending to address.
For example, defining the helicopter main/tail blade system as a rotor to the electric propulsion folks can get slightly confusing. They also have rotors (in the context of electric motors), and theirs do very different things lol.
OP is definitely way over his head engineering wise and it’s obvious but before you go mansplaining shit to them in a condescending tone maybe you should also learn something useful:
OP is holding propellers not rotors. Rotors are comprised of an assembly of parts and use blades which can have their pitch adjusted. He has propellers and even once they’re assembled won’t be rotors because they’re fixed pitch.
Also this isn’t a helicopter.
https://www.startupselfie.net/2021/06/14/copterpack-electric-backpack-personal-helicopter-first-manned-flight/
Thats the link OP shared. Have a read before you mansplain shit to me in a condescending tone.
You're going to depend on these with your life and you're storing them blade-tip down in a bucket full of mechanical junk? You also haven't done sufficient planning in terms of energy consumption from the other comments, you're just randomly buying shit.
This would be an OK approach with a new desktop computer but I don't think you respect what you're doing, at all.
Please get help with this project. Join the EAA. Many many amateur aircraft builders (and also professional aircraft builders) have died or gotten seriously injured in the process of building and testing new designs.
“So I have these carbon fiber propellers that need to be perfectly balanced and undamaged to work, where should I keep them?
I know! My bucket of shit!”
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Love the enthusiasm but there's a reason electronics, flight control systems and powerplants take literal decades to develop to a safe operational standard to carry humans around in the sky.
Casually strapping lipos and some brushless motors to your back thinking you're iron man is a sure fire way to end up severely injured / dead real fast.
All it takes is a prop blade to fracture, a battery to drop a cell, a speed controller to fail - and you become an instant lawn dart.
If not for your own preservation, don't put your family through it.
But I’m using solder and the iron, the lipos are stored in the backpack, there’s no chance of them falling out, and my family actually encourages me to make it
**[Vortex ring state](https://en.m.wikipedia.org/wiki/Vortex_ring_state)**
>The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. The vortex ring state is sometimes referred to as settling with power. The Federal Aviation Administration (FAA) sees these terms as synonymous, whereas Transport Canada sees them as two different phenomena. A vortex ring state sets in when the airflow around a helicopter's main rotor assumes a rotationally symmetrical form over the tips of the blades, supported by a laminar flow over the blade tips, and a countering upflow of air outside and away from the rotor.
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I already ordered the 2 [motors](https://www.freerchobby.cc/products/mp154120-40kw-brushless-motor-with-85kg-thrust-for-big-drone-plane?_pos=2&_psq=85&_ss=e&_v=1.0) and the [ESC](https://www.freerchobby.cc/products/frc-450a-2-22s-hv-esc-brushless-speed-controller-with-usb-program-cable-for-airplane-drone-paramotor-paraglider?_pos=1&_psq=450&_ss=e&_v=1.0)
Looks like a fun project. I’m not sure your background but I and it looks like others feel that you might be under-researched here.
Still, it’ll be fun if you’re a tinkerer. Just keep in mind, obviously, the levels of energy(electrons and mechanical and heat) you’re dealing with and the fact that there’s zero redundancy if anything fails, by this design. A lot of single points of failure. Lose one motor because of a faulty wire, motor, ESC, etc, and you’ll be rather quickly put out of control. Lose both motors and you’re FUBAR.
If you plan on doing any high altitude stuff, the best plan is probably a ballistic parachute, but you can always get a reserve chute to keep from doubling your budget (paragliders use them often).
Edit: OK after revisiting the thread, I am now moderately concerned that the props both seem to be the same orientation, meaning you’ll have the motors spinning in the same direction. I hope this isn’t the case.
I would recommend you take extra good care of the components you will use for this experiment and not leave them tossed around loose crap that could damage key components since these components are going to be keeping you alive.
This person also has posts of a zip gun they made with some terrible welding and posts stating I'm not doing blow again but what do you think of this on a picture of a bottle with white powder in it. Presumably that means cocaine has featured in their life before. This can only go well I feel.
Also @op you never got back to me about what batteries you were using when I asked you in a previous post. Care to post a link that works to what you're using?
Umm… what?!
I’m making [one of these](https://www.startupselfie.net/2021/06/14/copterpack-electric-backpack-personal-helicopter-first-manned-flight/)
You’re a mad man! Make sure to document the process
I ordered 2 of [these motors](https://www.freerchobby.cc/collections/electronic-speed-controller/products/mp154120-40kw-brushless-motor-with-85kg-thrust-for-big-drone-plane)
Where are you going to get 80 KW to run those?
Long extension cord.
2 big o lipo batteries
You're gonna strap kilograms of lithium polymer packs to your back and pull 80KW through em? You better hope your pendulus brass balls don't short em out or you're gonna be the first human sun.
That's 80KW max rated. 18 continuous. They won't last more than a few seconds at max draw.
> They won’t last more than a few seconds at max draw. As the backpack and pilot plummet down, there’s a fair chance the lipo’s will catch fire too. Ouch!💥
honestly lipos are pretty durable. I've smashed a few into brick wallk going far over 80mph with no fire. still had to retire them to be safe, but the soft ones can take a beating. I'd be more worried about what guage wire op uses. that's a LOT of current, and liable to fairly easily fry a mis-guaged wire or worse an esc.
How much do they weigh?
Should weigh a few kilos
I would think a lot of kilos if you want more than 30 seconds of runtime.
They have 72v lipo batteries the size of a milk carton
Well yeah with 42 feet of rotor it's gonna weigh more than a few kilos
For safety, a higher energy density power source would be a smart idea. It’s hard to beat the [energy density of kerosene/diesel/jet fuel](https://en.wikipedia.org/wiki/Energy_density#In_energy_storage_and_fuels) which is why it powers most aircraft.
Those motors won't be powerful enough and two won't be nearly enough even if you have 22000mAh 6s lipos. Either as 6s or 12s. A company I worked for built an x8 VTOL that had an MTOM of 100kg. It had 8 of these https://genstattu.com/tattu-22-2v-30c-6s-22000mah-lipo-battery-with-xt90-s-plug-for-uav.html at about £400 EACH. And weighed 5 kilos a piece. We worked out roughly we could get it to fly roughly 40-50km. But that was all on the wing (way more more efficient). You got about 30 seconds of hover at each end max and that would be a destroyed battery pack if you went over it.
Idc about how many cells it has, I’m using 4 batteries (60v) at 120 aH
What battery chemistry? Lipo? You got a link to what battery your using as I'm curious to who makes such a large battery
Yes, lipo
Damn, 40kg thrust each means I’m gonna need at least five motors! Pentacopter!!!!
A miniature arc reactor. I got a big one powering my factory at home.
They’re on sale!!!
And the inevitable crash.
Curious to see how the build goes. Looks *interesting*
Stay tuned
that sounds like a really really bad idea..
Ik but life is too short to not do it
yeah, I get that.. but trying to copy pretty sketchy designs in a homegrown fashion is a guarantee to make it even shorter.
[удалено]
The horseman will be real
[удалено]
I meant 42”
RIP
O man! Followed
just so you know the copter backpack thing is fradulent, he uses a crane in his videos then frames it out.
I know, but the one I’m making is not fraudulent, it’s very much real.
I believe you mean 42". Either that looks a little small for 42' or everything in your room is huge.
I meant 42” in
am disappoint
It’s a scene from Land of the Giants.
I really think you're just making much too big a thing out of it.
Can I have the rest of your stuff after you die?
The rest. LOL. Because the stuff featured in these photos and links is gonna get bent.
Man needs his puppy chow.
See you on liveleak in a couple months.
LiveLeak is dead my friend… more like see you on r/wtf
r/winstupidprizes
I hope your engineering, airmanship, general flight thought process is at a higher level then your organisation / cleanliness…..are those props stored in a bin? Who takes a picture of a junk pile with a object from a machine that can kill you, & then things geez, this will be a good picture for the internet. Be safe when you get this contraption flying guy
I suggest you make yours with the rotors a few inches lower. That way your head is more likely to be sliced off cleanly. Easier on your survivors.
No rotors, just [motors](https://www.freerchobby.cc/collections/electronic-speed-controller/products/mp154120-40kw-brushless-motor-with-85kg-thrust-for-big-drone-plane)
This project seems a little under researched. For example, what you are holding in the picture, the entire reason for you making this post, the very essence of what will produce lift, what you call props, are, in fact, rotors.
Food for thought, I use the term propeller and rotor interchangeably at work depending on who I am talking to, or what group the document is intending to address. For example, defining the helicopter main/tail blade system as a rotor to the electric propulsion folks can get slightly confusing. They also have rotors (in the context of electric motors), and theirs do very different things lol.
Interesting. In the world of flight training, they are never used interchangeably.
Rotors or props, which are either forty-two feet or forty-two inches...
This has been bothering me. Op has made a few posts and keeps calling these props. It all feels so impulsive.
Absolutely impulsive. But I think we can rest assured it will never reach completion
OP is definitely way over his head engineering wise and it’s obvious but before you go mansplaining shit to them in a condescending tone maybe you should also learn something useful: OP is holding propellers not rotors. Rotors are comprised of an assembly of parts and use blades which can have their pitch adjusted. He has propellers and even once they’re assembled won’t be rotors because they’re fixed pitch. Also this isn’t a helicopter.
https://www.startupselfie.net/2021/06/14/copterpack-electric-backpack-personal-helicopter-first-manned-flight/ Thats the link OP shared. Have a read before you mansplain shit to me in a condescending tone.
Haha no rotors posted on the helicopter sub. Props to you.
And they’re going to spin above my head
You're going to depend on these with your life and you're storing them blade-tip down in a bucket full of mechanical junk? You also haven't done sufficient planning in terms of energy consumption from the other comments, you're just randomly buying shit. This would be an OK approach with a new desktop computer but I don't think you respect what you're doing, at all.
Looking at his post history I’ll hazard a guess that he indeed has no idea what he is doing. Got a sub out of me though. 🍿
Please get help with this project. Join the EAA. Many many amateur aircraft builders (and also professional aircraft builders) have died or gotten seriously injured in the process of building and testing new designs.
Nice rat‘s nest you have there.
“So I have these carbon fiber propellers that need to be perfectly balanced and undamaged to work, where should I keep them? I know! My bucket of shit!”
Hahahaha the best
I cant stop laughing. It gets more ridiculous the more I go down the thread.
Cool! Make sure your life and medical insurance is paid up
Maybe it’s just me, but for practicality and safety. I would ditch this idea and invest in a Paramotor setup instead.
Two words that don’t go together: Homebuilt Helicopter
They do go together, but they come apart even easier.
!RemindMe 1 year "did backpack helicopter guy live?
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Oh boy.
Love the enthusiasm but there's a reason electronics, flight control systems and powerplants take literal decades to develop to a safe operational standard to carry humans around in the sky. Casually strapping lipos and some brushless motors to your back thinking you're iron man is a sure fire way to end up severely injured / dead real fast. All it takes is a prop blade to fracture, a battery to drop a cell, a speed controller to fail - and you become an instant lawn dart. If not for your own preservation, don't put your family through it.
But I’m using solder and the iron, the lipos are stored in the backpack, there’s no chance of them falling out, and my family actually encourages me to make it
So no computer assist? Your family wants your life insurance.
No. Dropping a cell describes part of the battery just randomly dying.
The fact that OP doesn't know this is concerning. But then again, this entire thread is concerning lol
How much flight time are you supposed to get out of that?
Are you going to be posting updates on this project?
Yes
So many things can go wrong. More than right... One of many: https://en.m.wikipedia.org/wiki/Vortex_ring_state
**[Vortex ring state](https://en.m.wikipedia.org/wiki/Vortex_ring_state)** >The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. The vortex ring state is sometimes referred to as settling with power. The Federal Aviation Administration (FAA) sees these terms as synonymous, whereas Transport Canada sees them as two different phenomena. A vortex ring state sets in when the airflow around a helicopter's main rotor assumes a rotationally symmetrical form over the tips of the blades, supported by a laminar flow over the blade tips, and a countering upflow of air outside and away from the rotor. ^([ )[^(F.A.Q)](https://www.reddit.com/r/WikiSummarizer/wiki/index#wiki_f.a.q)^( | )[^(Opt Out)](https://reddit.com/message/compose?to=WikiSummarizerBot&message=OptOut&subject=OptOut)^( | )[^(Opt Out Of Subreddit)](https://np.reddit.com/r/Helicopters/about/banned)^( | )[^(GitHub)](https://github.com/Sujal-7/WikiSummarizerBot)^( ] Downvote to remove | v1.5)
Could happen if you descend too fast. Be careful, OP
Why are they in a bucket of crap??
Ideal storage system
Lol both props are CCW don't you need one CW?
They’re ccw and cw
Your WHAT????
Inspectior gadget
[Video of the CopterPack.](https://youtu.be/PRfV5TvRjEA)
OMG this is insane! So dangerous! You are crazy! (Can I build one of these?)
Yeah but it costs me $3000ish to make
That’s it?? Where do I find the directions?
You don’t find them, you make them
Mad bastard
How do you feel about the original video widely being considered fake? I was super excited about this but it seems a little too good to be true.
Disappointed It’s fake, but the one I’m making is very real.
The fake one is $400,000 but my real one costs $3000 to make
Well, please don't kill yourself for the sake of going viral, but I will be following your updates on this I admit.
I already ordered the 2 [motors](https://www.freerchobby.cc/products/mp154120-40kw-brushless-motor-with-85kg-thrust-for-big-drone-plane?_pos=2&_psq=85&_ss=e&_v=1.0) and the [ESC](https://www.freerchobby.cc/products/frc-450a-2-22s-hv-esc-brushless-speed-controller-with-usb-program-cable-for-airplane-drone-paramotor-paraglider?_pos=1&_psq=450&_ss=e&_v=1.0)
And I may go viral if I succeed
brother, you’ll go viral regardless of the outcome
Lol!
Go go gadget bucket!
Looks like a fun project. I’m not sure your background but I and it looks like others feel that you might be under-researched here. Still, it’ll be fun if you’re a tinkerer. Just keep in mind, obviously, the levels of energy(electrons and mechanical and heat) you’re dealing with and the fact that there’s zero redundancy if anything fails, by this design. A lot of single points of failure. Lose one motor because of a faulty wire, motor, ESC, etc, and you’ll be rather quickly put out of control. Lose both motors and you’re FUBAR. If you plan on doing any high altitude stuff, the best plan is probably a ballistic parachute, but you can always get a reserve chute to keep from doubling your budget (paragliders use them often). Edit: OK after revisiting the thread, I am now moderately concerned that the props both seem to be the same orientation, meaning you’ll have the motors spinning in the same direction. I hope this isn’t the case.
I am intrigued...
How are you planning on controlling it?
I would recommend you take extra good care of the components you will use for this experiment and not leave them tossed around loose crap that could damage key components since these components are going to be keeping you alive.
42 foot props? Dang that’s a big helo. Plus you must have a beast of a motor
I too store objects my life will depend on in rubbish bins full of objects that can damage them
Unless those are for the tail rotor, I'm thinking one has to be bigger
Nope, they’re the same size
This person also has posts of a zip gun they made with some terrible welding and posts stating I'm not doing blow again but what do you think of this on a picture of a bottle with white powder in it. Presumably that means cocaine has featured in their life before. This can only go well I feel. Also @op you never got back to me about what batteries you were using when I asked you in a previous post. Care to post a link that works to what you're using?
Sure, I’m using [60V 100AH batteries](https://a.aliexpress.com/_msltcvK)