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Carbon rods and tubes

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Happy Days:
Er,….todate? :shock:  nothing I’m afraid. :oops:  Haven’t forgotten, just been a bit tied up with other matters and the building of a ‘Riser’. (Polyhedral floater) So that I can challenge you 8)  on those calm weather glide ins!

I’m trying to build it with less weight in the tail so that there’s less weight  needed to be added to the nose to balance it. The idea is to get the AUW to well below the manufactures min.
I’m gonna use pull/pull wires for rudder and elevator instead of snake control rods. I’ve drilled holes in solid tapered balsa elevator. Going to position the servos further forward than shown in plans to better act as counter weights. (To the tail) Intend to use 2S lipo and Ubec instead of Metal Hydride battery. And a carbon rod wing joiner instead of the  steel one supplied.
 SIG recon it should come in at AUW of 45ozs. I’m hoping to get it down to 40 ozs. That would produce a wing loading of around 5.75oz/sq ft.
 
Armed with that I recon I should be able to catch up with you :twisted:  in those thermals! :D

Keith

gerryb:
hi keith,

have you considered the covering material?  might i suggest 'fiba' film? it's a film from the same company that make 'solarfilm'.  it's a polyester film, very light, very strong - much stronger than solarfilm and comes in a variety of colours.  as there is no adhesive on the film, you have to brush a coat of 'balsaloc' onto the surface you wish to iron the film to.  this means you only have glue where you want it, saving more weight.

i have used this film several times (have a look at my blue and yellow 'bird of time'.  the blue is fiba film) and i'm delighted with it.

regards,  gb

Happy Days:
Well Gerry, "Sods Law" dictates that………………..by the time I had read you last post, I’d already covered the tail feathers in Orafilm. :roll:  I wish I’d known about fiba film and balsa loc before! Dam  

Well thanks for your info anyway.
I still recon this little girl will beat any of your’s when climbing in a thermal though! :twisted:  we shall see next summer. (That statement pre-supposes that we get a next ‘summer.’ :roll: )

K.

gerryb:
doesn't matter what you cover it with, keith.  the magic is in the fingers!!!!!

Happy Days:
Re Carbon wing joiners………Finaly got the sizes I need from SMC. (Didn’t know they did them. :shock: )

The weight of the carbon tubes and rod to join the wings of this plane work out at just 10% of the supplied steel rod and copper tubes.

Of course, the trade off is in price. :( But but who cares :wink: ,…..I’m feeling extravagant! :P

K.

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