| >(I'm not really sure how many G's that plane is capable of. Given
| >enough speed, three seems reasonable.)
| Its WAY more than that ... (kinda Scary when you think about it) The
| max G-load is proportional to the SQUARE of the speed ratio. To run
| some typical numbers Say the stall speed is 20 mph (probably high
| ... even for a durathing ... ) Lets say you have a really crappy
| engine on it and max level speed is 40 mph ... in that case (40/20)
| squared = 4 , so 4 Gs (24 lbs)
Interesting. I'd never heard of that, but it makes sense.
Though I doubt a Duraplane 40 stalls at 20 mph. Probably faster.
At some point, even with enough rubber bands, the wing won't be able
to handle the stress and it'll fold. If it stays in one piece, you
might be able to land the plane -- it depends on just how much new
dihedral you got, and how symmetrical it is.
Also, the (# Gs x the total weight) formula is a little bit unfair,
because the rubber bands don't have to support the weight of the wing
itself. But the general idea is still valid.
| I have seen wings and fuselage part company in the air several times,
| and it sucks.
Dunno -- it's really cool to watch, as long as 1) it's not aimed at
you, and 2) it's not your plane. The wing flopping down is really
| (as an aside, if this does happen, input the controls for a spin,
| sometimes the offset rudder and elevator can get the wingless fuselage
| to do a "maple leaf" type autorotation. If you have time, vary the
| throttle to try to get it going, otherwise just go to idle, but do try
| the spin ... at that point you have nothing to lose.
I had that happen to me once. It was a Pico Stick. I was a few
hundred feet up, and I did a loop, and the wing folded, and half broke
off. And then the other half broke off. And then the stab broke off,
leaving only the vertical stabilizer left. Which proceeded to
autorotate at about two rev/s, and land very gently. A while later,
the other three parts (left wing, right wing, horizontal stabilizer)
This happened at the local (non-RC) park. I had quite a crowd
watching it, and they were all sutiably impressed. Several thought I
meant to do that :)
In any event, if one of the stabilizers (horizontal or vertical)
hadn't come off, I suspect it would have made a lawn dart and there
would have been nothing I could do about it. Yes, moving the sticks
so both controls are at their maximum angle would slow it down (and
therefore are a good idea), but I don't think it would stop it from
being a lawn dart.
I wish I'd had that on film. It was cool enough that I'm tempted to
try and force it again -- maybe someday when my Slow Stick gets so
ratty that I'm ready to replace it, I'll weaken things and see if I
can force it to happen. And make sure it gets filmed ...
Doug McLaren, firstname.lastname@example.org
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