On Mon, 01 Oct 2007 10:54:19 -0700, "Robert M. Gary" wrote in
. com:

I was at an airshow last weekend and the RC planes have very affective
smoke producers. They add an oil to the exhaust stream to get the
smoke.

True.

But, as a general rule, RC smoke systems inject oil into the
muffler and the smoke comes out of the exhaust system, not
from the wheels making contact with the runway.

I'm not saying that they couldn't have run smoke from the
engine down to the front wheel of the aircraft in the video,
just that it seems highly unlikely.

From 11 years of flying RC aircraft, I am willing to bet
that there is no input that could be given to a scale
model capable of making that flight and landing that
would result in the nose bouncing up and down like that
on landing. To get the nose up, you'd have to use
elevator control. If you have that much energy in the
system, the mains will leave the ground along with the
nose.

I know LOTS about pilot induced oscillations, porpoising,
bounce-and-goes, bounce-stall-cartwheels, etc.

They may have used a model to film the airplane's scripted
movements, but the nose dance was most certainly produced
by photo-manipulation or CGI.

Marty
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