Rudder induces turn by its secondary effect on roll which results from one
wing being presented at a different AoA to the other. If you use rudder to
keep your magnetic compass constant then you will roll into an unusual
attitude. If you use rudder with opposite aileron to prevent the roll then
you induce a sideslip and your ball will go off centre as indeed will your
compass because you are unbalanced. If you loop an aircraft, the compass
reads one direction at the top and 180 degrees the opposite at the
bottom....trouble is, in cloud you don't know whether you have looped upside
down or just turned around to the opposite heading....unless you look at
your other instruments and the bloody cat. Where is the recomendation
published to adopt a southerly heading if intending this manouvre and what
happens in the southern hemisphere where the compass points the other way!!
John Martindale
29 Jane Circuit
TOORMINA NSW 2452
AUSTRALIA
phone: 61 2 66584767 (H)
61 2 66869075 (W)
mobile: 0403 049990
email: [email protected]
web: www.members.optusnet.com.au/johnjanet/Martindale.htm
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, December 13, 2006 9:13 AM
Subject: KR> Re: decending without gyros
> Using the compass is a good trick also, BUT the recommended method is to
> turn SOUTH not East or West, due to dip errors causing the card to move
> more rapidly and more overall. A Southerly heading will have the compass
> the most sensitive, and easiest to read. Then using the rudder pedals only
> IF YOUR AIRCRAFT will turn that way, will prevent over controlling into an
> unusual attitude. If your plane will not turn well with just rudder input,
> then you will need to interfere with overcontrolling by blocking large
> inputs with your body, ie: your legs, or hold your elbows in tight etc...
>
> Colin Rainey
> N96TA
>
>
>
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