[NSRCA-discussion] Weather Vane

[J N Hiller]

Tail Rotor! Interesting! That is a plug and play electric device.
Jim Hiller

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of James Oddino
Sent: Wednesday, October 10, 2007 1:26 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Weather Vane

Hi Ed,

Yes, but....
If the airplane has very low forward speed along the track, like just before
a spin, the plane will turn into the wind if the cp is behind the cg
(statically stable).  Say the wind is from the left, the plane will turn
left.  Now if we increase the forward speed along the track, the relative
wind will hit the right side of the plane and turn it to the right, away
from the crosswind.  So if the forward speed is much higher than the
crosswind speed the greater area aft of the cg will actually counteract the
weathervane effect.

Bottom line, we need a vertical stab and all that goes with it, although
I've thought about a tail rotor on a pattern ship.  One of you young guys
should try it.  Picture the perfect stall turns.

Jim O






On Oct 10, 2007, at 9:36 AM, Ed Alt wrote:



Hi Ron:
I wonder if the weathervane effect is there because of the greater
distribution of side area aft of the CG?  I’m not sure of that, just an
idea.

Ed

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