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Very very late, but here is my humble offering - only completed and test flown last weekend.. Better late than never, but better never late..

pa190001.jpg

Fully Dressed

pa120023.jpg

Naked...

AUW 810g (incl 2200 3S).

The biggest changes are intended to reduce drag, no undercarriage and a slimmed down fuselage profile (Sorry Steve).

And here is the broken prop shaft (failed on full chat on the 2nd flight)

pa210004.jpg

Failed in mid flight at the circlip, note the granulation in the steel.

A replacement motor (3536 1700kV) on order from GC.

A few more photos here if you are desperate

http://www.modelflying.co.uk/albums/member_album.asp?a=21677

 

Best wishes

Martyn

Edited By Martyn K on 23/10/2012 17:15:54

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Posted by Martyn K on 23/10/2012 17:15:22:

And here is the broken prop shaft (failed on full chat on the 2nd flight)

pa210004.jpg

Failed in mid flight at the circlip, note the granulation in the steel.

A replacement motor (3536 1700kV) on order from GC.

A few more photos here if you are desperate

**LINK**

Best wishes

Martyn

Edited By Martyn K on 23/10/2012 17:15:54


Do you think that if you put a lightweight wire undercarriage on it that it would offer some protection for the prop and therfore the drive shaft?

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Posted by Ian Jones on 23/10/2012 23:41:56:


Do you think that if you put a lightweight wire undercarriage on it that it would offer some protection for the prop and therfore the drive shaft?

Hi Ian

Clearly some protection, but it had only one previous landing which was very gentle (as you saw). I think it was a duff batch of steel looking at the granulation in the fracture. I suspect a harline crack formed when the circlip groove was cut and it was just waiting to happen.

I may be tempted with a monowheel..

A 4mm shaft simply should not break, bend reluctantly, but NEVER break. The prop blades should have sheared before the shaft failed, even if the motor had seized solidly.

Regards

Martyn

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