Master Series Builds, Past Present and Future.

Jo's squadron

Elite member
That didn't take long...

I've had 5-6 flights successful flights in so far, and was just starting to get the feel for her when this happened.

It looked like the plane got hit by flak. After forgetting to bring my transmitter to the field, the club president let me borrow his...so all eyes were on it as it stuck the takeoff and took some nice high lazy circuits. After a minute or two, I brought her in slow over the field... when the port wing exploded! Could have been a SAM. Maybe an AAM? Maybe a cannon shell? The world will never know what brought down the F-18 V3.

She lingered for a long while. The bottom skin held on to the fuselage by the servo & lights wire, while the top skin lazily drifted down to the earth. Meanwhile, the F-18 minus the one wing, did the Top Gun flat spin into the mud from about 50' in the air, nice and slow like. I think Goose would have been able to successfully eject from this one.

Upon inspection, it looks like the spar snapped in the middle. That's two FT jets now (there's cool video of my FT Me-262 wings folding up in level flight here somewhere) that I've lost through single wooden spars busting in the middle. I don't really fly that aggressively, and I've been building for a while, so my two likely guesses why are:
  1. Occasional Bad Gluing Technique- maybe there's not enough contact between wooden spar, foam spar, and wing skins. I've used both hot glue and foaming gorilla glue and it seems like the gorilla glue holds better. This time I used hot glue. Maybe the wingskin/spar contact was poor enough for it to lead to additional flexing of the wing that eventually breaks the plywood spar. Its sort of like the metal fatigue around the windows that doomed the Comet airliner back in the 1950's.
  2. Weak Wing Spar- maybe one solo wooden spar isn't enough to handle the stresses of a high speed, twin 70mm EDF, adrenaline-pumping, 6s powered, foamboard F-18 Super Hornet tearing through the sky. I don't have any evidence for this, though: I got probably 20 flights in on my first F-18 before a tree ate it. #2 rudders failed on maiden. #3 wing spar failed after 5-6 flights. I just don't know. Its a big plane, after all - maybe adding an aluminum wing spar might help. Nerdnic uses aluminum reinforced spars in his planes, which are a little zippier than the average FT design and require a little more support.
Just a thought. It actually doesn't look too bad, considering. It would be a candidate for repair, except for the broken wing spar issue. Build, fly, crash, repeat.
Aw man! sorry to see it retire prematurely.
 

Mr NCT

VP of SPAM killing
Moderator
There are two good sets of 109 plans on this forum by Bwarz and Whit Armstrong. Both are awesome- check them out.
Good catch! And there's a mini, too.