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kwalus

A Balloon Powered Helicopter

by kwalus Sep 19, 2013
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I found that the nozzle do not enter at all in the rotor, so I had to take back design to FreeCAD. Another strange things is that with Cura when trying to print or seeing with slide view, I do not have the firsts layers printed or shown. Again I had to take it back to FreeCad to correct it.

Also, I was printing for 3 childs, and having each times 3 blades for each air output (3x3x4), I printed the bigger blades one and did several small washers with different inside hole, so air flow can be controlled by changing only the washers. It can be inserted between the nozzle and the rotor.

Thanks is is really an amazing toy.

if you post the remixes you made, others will also see them linked from this page.

OK, I'm currently testing it and I will post the designs. However. I found when correcting that my printer and the Software (Cura by Damgoma) is simply ignoring details with thickness lower than 0.1mm to 0.2mm however my printer is rated at 0.1mm . It explains why the nozzle did not fit to the rotor : just because top of the nozzle was simply not printed. Same for bottom of rotors and wings of blades. I congrutulate you about the thinking about the weights and just cry about my printer. However, I will post soon the designs for bad printers....

I posted the remix, but actually it is locked. Do you have to accept?
Cheers,
François

There is no option that I could find to release your remix.

Must print with strong raft because the flexible part has trouble coming off a skinny raft, will reprint.

Nice build. Trying to mount it horizontal. I feel that a center rib would help the printer span the unsupported areas. Any ideas on this?

Comments deleted.

Has anyone tried to use a condom instead of a balloon? Can hold a lot of air but doesn't weigh so much.

maybe it doesn't fly very well because of air blockage so it might work better if you stick a really thin file in and turn it around and around.

How long does it take.

I have a commercial one, I will try to weigh it tonight.

Did you take the measurement?

I did, this one weighs 4.8 grams

I dream from seeing a baloon quadcopter. Who dares ?

I think you'd be better off mounting these upside-down from how you have them shown. They have negative camber the way they are now, which is why they don't make much lift.

the rotors are printed upside down, did you assume they were positioned right side up?

Based on the definition I found ( http://en.wikipedia.org/wiki/Camber_%28aerodynamics%29http://en.wikipedia.org/wiki/C... ) it seems to me to be positive if I take the bottom to be both the cord line and the bottom camber line? How do you figure it is negative? Admittedly, I am not an aeronautical engineer, so I appreciate the feedback. I was hoping to print out a nice airfoil but ended up using this to keep it printable with minimum weight.

It's a little tricky to describe, but trust the aerospace engineer, you want them the other way around. For the shape you're stuck with for printing, you'll be best off with the flat side on top with the curved bulge on the bottom side of the leading edge. You'll also want that leading edge curved instead of pointed. You can imagine it as an approximation of the blackbird or sailboat airfoils from here: http://en.wikipedia.org/wiki/Airfoilhttp://en.wikipedia.org/wiki/A...

Thanks for the feedback, I will definitely try this out.

oh man, I haven't seen one of these since I was a kid back in the 80s. I might have to print one out for MY son. :)

Interesting, but I think a plain old balloon might be more fun to play with. Can you angle the jets more so the thing goes up some before it goes down.

interesting combination of messages. Regarding the nozzle, it is designed to be printable with minimal weight, I am not sure how you could angle the jets down much more without more weight? You can try higher angles of attack and those are posted but from my experiments the best has been 13 degrees.

I will make a video of the best peeling technique

I printed this, but as the instructions say, you must be very careful taking the blades of the building plate. On my Replicator 2, the blades ripted into pieces while taking them of the build platform - I will try one more time on blue painters tape.

Excellent! Thank you Thingiverse for featuring this thing! It was great fun working on the Makerbot to develop this!

Cool, i remember thses