Not much space if you're going on holiday with the family in a Renault Clio. This design fits into a 52cm toolbox with transmitter and all accessories.
Just thought I'll share my crash resistant design that has evolved through many drops and repairs. On impact it is now usually just a matter of replacing a rivet or a prop. The electronics and battery can quickly be removed for installation on another airframe.
The props are 15" RC timers and as shown I get about 23min flight time with a slightly damaged 5000mAh 4cell Lipo at 1500m above sea level, 25 deg C.
The difference in spacing between front and rear props doesn't have a noticable effect on stability and it flies waypoints very well.
I'll post basic plans if anyone is interested or if you want an airframe let me know.
Update: Plans for the airframe
Comments
not sure about your unbreakable plan but there is a sever weak point there.
yup exactly how i have been doing it... :)
https://www.youtube.com/watch?feature=player_embedded&v=XKU9yBX4q8c
@Todd, no balancing of the props. In fact until recently I flew it with 2 chipped props and a bent prop shaft. Still handles well both manually and autonomously. Just don't fly way points at 6m/s or higher in wind. Tends to pick up major speed after turns - could be software related. I think the wide engine spacing helps with stability, maybe the slow turning props too.
The bent prop shaft just seemed to add jello to the Go-Pro footage at 30fps.
Only 2 negative things I found about the RCTimer 360kV motors are that they weigh about 80g each and the windings can get damaged quite easily, thereby ruining the motor.
@Graham: I remember seeing your H-frame quite recently and liking it. Can you maybe post the link to it again?
Nice clean build. I like it! Have you had to do any additional balancing on the props?
Cool looking props!
Nope. I didn't. But, I see it now, I think you might have uploaded it again.
Thanks Ruwan, did you also remove the folded picture? I don't see it anymore.
Nice airframe Murray. I've uploaded plans to the original post so we won't lose them if third party site goes offline. Thanks for sharing.
- Ruwan
@Graham: No problems with stiffness as the fuselage part is sandwiched construction. Flies waypoints just as well or better than my small quad with 10" props. Direct control with RC is also without any problems. Loiters very well etc. The frame in the pictures was actually straightened with a 5lb hammer after I dropped it 30m onto tar at 60 km/h! (Prop came off in flight). I've also had drops from 70m+ onto rocks without bending the frame. (35mHz Antenna into props).
Thanks for the tip Michal. The basic plans are at http://we.tl/4jKqSBcNAg
The arms are Carbon 10mm. Got them from bow shop. Crossbow arrows. Bonded into 12.7mm square Aluminium tubes at ends. They fit perfectly.
Andrea: Nice to see your photos. I was wondering why I haven't seen one like this before. How do you fix your arms into position?
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