hello,

For those who want to test ...I put a lot of pics about the building process.
That's the build log i post here :
http://www.rcgroups.com/forums/showthread.php?t=1790246

I do my best to explain it in English, ins't perfect but understandable (i hope),
I hope you'll enjoy it,
Best regards,

Beautiful work! And as for your English, it's a LOT better than my French...

Very nicely done! What was the final weight of just the airframe?

Shedofdread :
Thank you for my English, but I'm sure there are many grammar mistakes and word errors, but if you can understand that’s the essential

Wyowindworks, your datas :


I prefer giving you detailed weights because of my errors in the final achievement and reinforcements choosen.

Weigths of the frame’s sandwich skins without before assembly (not glued half shells and accessories):

Wing 31.5gr
Fuselage and tail: 19.8 gr
Horizontal elevator : 6.3 gr


Frame Elements finished :

Wing (included former, spar, horns, ball joints, steel linkages and servo mount without servo): 44.3 gr
Fuselage, including bulkhead, rods linkage, ball joints horns, various reinforcements and battery mount (without geared motor and electronics and servos) : 39.9 gr
Elevator with hinge and clevis: 6.6 gr

So a total weigth frame : 90.8 gr.

I think we can do even more lighter, we can save at least 10 grams!...
As many of us, I always tend to put too much resin with micro balloons when I glued the half-shells (I like to do sturdy ... but at this scale each gram is really important), except for motor bulkhead, the formers are too heavy and strong. As regards the wing, I make same error as the fuselage, I put too much resin and micro balloons. Because the skins are really strong, the wing spar isn’t indispensable, on my next models I’ll replace it by studs which ensure the bottom and top surfaces linkage.


Per dm² this layup (Kevlar 36gr/m² + glass 25gr/m²+honeycomb 1.5mm+glass 25gr/m² gives :

Weight calculated to obtain an estimate before implementation: 2, 2 gr / dm²
Weight achieved with flat test specimen: 3,03 gr /dm²

Weight below are "out of the mold (per dm²)" the halfs parts achieved depending on the complexity of the shape:
For the wing: ~ 3.15 gr/dm²
For the fuselage: ~3.98 gr/dm²
For the elevator: ~ 2.86 gr /dm²

Reading that, you can deduct that the more the shape is complex the harder is to obtain a light frame weigth…

Regards,

Wow.

That air frame is a work of art.

And, I learned something about the use of plasticine. Thanks for sharing your build.

Originally Posted by eRaptor

Wow.

That air frame is a work of art.

And, I learned something about the use of plasticine. Thanks for sharing your build.

Thanks a lot, it was a pleasure to share .
Have good flights and fun