Hi all!

I´ve seen enough photos of people having cut themselves with their copters, to start thinking about building a fully protected multicopter.

Having searched for something similar, I found the safeflight copter, which is not produced any longer.

Reading about flight times and concerning the additional weight, I realised that it would not be an easy task, to build a multicopter, that has acceptable flight times (more than 10 minutes) and still is agile enough to have fun AND small enough or with easy disassembling, to be transported.

Additionally, I thought about giving it a good look with a kind of thermoformed housing.

Has anyone ever made a really safe housing (like the safeflight copter)?

I found some woven thread used to catch big fish, while fishing. It´s a half millimeter thick and holds about 40 kilos. That might be suitable for adding a netting over the copter, so nobody can stick their fingers into the housing of the props.

What´s really annoying, is that I have absolutely no idea of how to add that netting on the housing of the props. Glue? Weaving like in a badminton rack? It should be removable, since you have to change the props from time to time.

For the housing itself, I have made some styrofoam circles, but they seem to be to brittle to withstand a small crash. I thought about having a small layer of glass fibre added around them.

Whatever I think about, adds a lot of weight to the copter, so I thought about setups, that would suit my needs.

But I´m not sure, wether to build an Y6 or X8 copter with 10 inch props or simply a quadcopter with 15 inch props, trying to make the housing of the props as lightweight as possible.

Discussion and comments are welcome and higly appreciated!

Thank you,

Steffen

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You would probably want to build a quadcopter because that way you will have to cover less of the props and thus save on weight. 

In terms of the protective housing you could have the mesh made on a metal (Light metal) ring that has clip fitting on top of the prop housing. 

Hi NASMO,

thanks for the quick reply. Good idea with the metal ring. Could look like a badminton racket.

would also be stable.

I just thought: Why not make it out of cfk. And why not put the rotors facing to each other instead of the motors? This way, I could design a little more oval instead of rectangular, seen from the side.

Using google, I found a ready made frame with exactly the same features.

Take a look at the Dronewerx PG Y6 or the PG X8

Not commercially available yet but I just sent them an email, when it's gonna be sold.

I hope, I can wait that long, otherwise I'm gonna need some tips on how to get these parts cnc cut ;-)

And I don't need to buy 200 meters of woven high texh fishing thread

Hi

need to make a good "airflow unit". just a fan cage that is solid as one unit. so it won't fall apart and will be stable. the ducting really does mess with the airflow but having a full 129600 degree cage is hard but not impossible.

All I see is that you need more power and it will weigh more but that's your price to pay. Any savings on making the cover lighter are little compared to simply removing the covers and being unsafe, so take the hit and make it stronger.

Here is my idea in picture form

Hi, thank you for the answers!

Yesterday, I found out, that the guys at Dronewerx had the same idea.

If someone is interested, the frame is called PG Y6 and PG X8

If I would have knows this 3 weeks before, it would have saved me a lot of sleeples night ;-)

Just need to wait, until they are really going to sell it. There is no info yet, when this is gonna happen.

Thank you all

tbh just don't use carbon props

recently I saw a y6 design that was all cut plate, in a very well done exoskeleton. I will see if I can find a picture and post it, 

Been working on that

see it here..

DSC_0109

That would be great! Gonna check out, if there are gfk plates available in that size. And what they cost.

Perhaps it´s possible to start with a thin wooden plate. Perhaps Balsa-wood (don´t know, if that is the correct translation for the type of wood that´s used for sailing planes.

That looks awesome too! Great to see all your answers and ideas!!!

What´s it made of? It looks like it´s made out of one piece. How did you realize that and where can I get the materials? How about the weight? Flight time? Sorry for so much questions

Did you mean this one?

Attachments:

Okay, you gave me some very interesting ideas.

What I found, looking at the idea of chrisa with the fan cage, are metal wire guards for pc fans. They are too small for 10 inch props, but looking at a light and stable metal brought me to titanium wires. Just ordered some in different thicknesses for a first test. They are called grade 5 titanium alloy and are assumed to be lightweight and stable, used in aerospace. Cost: 3.80 € per meter. Gonna tell you, what came out of testing those :-)

I think this is one of the most important issues in private drones/multirotors, for the reason you suggest and others.

If many more peope get hurt by props, no matter the circumstances, it will become a serious direct threat to private drones.

The problem is that as you already know, any guard you make adds weight, but also deceases its flight ability, and can actally cause a drone to fly sluggishly, lose flight time, speed, all kinds of things - yet, somehting is necessary nonetheless.

The styrofoam frames on some you have seen are very light, but they do cause a little drag and reduce flight ability.

Carbon fiber is good, but increases the cost of the craft, and it still has a weight factor, even if it is less than most other alternatives.

Ideally, I think if someone could invent a better 'foam', that would help.

Personally, I would suggest that the actual frame design is very important - maybe you can come up with a design where the guards ARE the frame as well, thus eliminating the weight of having guards and also a frame otherwise, similar to what is already common out there.

I have real solutions to it, but unfortunately, they are two of my desings that I could make real money on, so I feel very uncomfortable with the idea of giving it away, so we both are ham-strung by this, lol., (sorry) so what I can suggest is something that is almost nothing, a thin and sparse lattice of something incredibly strong, and rigid, yet not brittle, that can take some impact without breaking or flexing into the blade(s).

I would suggest incorporating fine, high-quality aluminum reinforcement in carbon fiber, but changes in temperature could cause problems due to expansion and contraction.

I would suggest carbon fiber nano tubes technology, and that would definitely work, but even if the technology were more available, it would be incredibly expensive, and possibly difficult to fabricate on top of it all.

It is a very difficult problem, full of paradoxes and contradictions, yet is extremely important to the future of private drones, so don't give up !

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