Re: Re: 40% Stab size or 20%?

From: Don Slusarczyk <don_at_slusarczyk.com>
Date: Sat, 23 Oct 2010 01:11:23 -0400

The models had slow/poor recovery. Poor recover and "unstable in pitch"
are two separate things (at least to me). If someone says to me a model
is "unstable in pitch" that means to me that the model is completely
untrimmable and will not fly at all it, i.e. it can not be trimmed to
fly at any speed or any angle of attack. That is not what happened, the
models flew but when disturbed had poor recovery. So to me they were
pitch stable (they flew) in calm air but had poor recovery when
disturbed. For a small tail to work well in a duration model you would
need a long tailboom, but 36" long EZBs with 15% tails are simply not
practical. You can however do that on an outdoor FF model much easier,
and long tail arms with "small" stabs seem to be popular.

Don

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> The model is pitch stable it just had poor recovery.
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> You lost me here. Please elaborate. Do you mean slow/marginal
> recovery? Is this not the same as low SSM/pitch instability?
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Received on Fri Oct 22 2010 - 22:27:54 CEST