Finished destructive flight tests... el Cheapo update! - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Fixed Wing Discuss fixed wing aircraft.

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Old 06-17-2003, 07:56 AM   #11
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There was an article in the July Model Airplane News about that very triplane being repainted. Interesting
Adam S.
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Old 06-17-2003, 10:30 AM   #12
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This was (is) a very common technique we used to make spars in foam wings for our pattern models.

The spar is oriented in the foam so that the CF acts like an I-beam. All you need to do is router a 1/4x1/4 slot in the wing and glue in the spar. They are super light, and very strong.

I have went as far as only cutting a slit in the foam and just gluing in the CF laminate but its more work (works just as good).

I dont know how you had the tow oriented in the wing, but tow is very heavy and unless designed properly wont provide much strength. Just laying it on top of the wing gives a little more strength but nothing even close to this type of spar.

Anyways here is a picture.
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Old 06-17-2003, 11:30 AM   #13
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I have used a laminated balsa/cf/balsa spar in quite a few planes that had a wood spar. On the el 'Cheapo #1 I just ran some tow under the paper/epoxy covering full span top and bottom, just like when I make a smaller 1/2A model with a foam wing you use some FG reinforced packing tape for a "spar".

The wing is /was remakably strong for what it was, but obviously not enough for repeated punishing flights and crashes.

In the MKII wing which I have allready started, I cut a 1/8" wide groove allmost the full depth of the wing 1/3 back from the LE into which I glued a 1/8" by 1-7/8" wide strip of aircraft birch ply. THAT is strong enough, but on top of that I am gluing a .007 by 1/4" strip of CF twice on the top and twice on the bottom. Its light and I have a bunch so I will just use it.

I cant see this wing breaking, unless it hits the ground hard... should not fold this time..

I am also making the new fuse from foam core/laminated coroplast onto both sides with CF under neath to stiffen the fuse up.

Flight tests on "el 'Cheap GRANDE!" to begin hopefully this weekend
Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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