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Old May 28th 06, 05:57 PM posted to rec.aviation.soaring
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Default preferrred bank angle indicator?

Gary Evans wrote:
I have culled the collective wisdom in this thread
to save any new followers time.

Use of Trutrak T&B indicator for emergency cloud
flying

I'd say close but not quite accurate:

1) To fly in a cloud means certain death or worse.


Clearly not, because pilots do it and survive. I'd say, to fly in cloud
without proper planning, instruments and knowledge of what you're doing
is very risky indeed. However, letting down through a cloud layer via a
benign spiral (if you know there's plenty of clear air beneath) is
likely to be comparatively low risk.

2) You should fly in clouds for practice.


For intentional cloud flying, my limited experience and more extensive
reading tells me you need to keep in practice. Unintentional entry I
wouldn't practice for, but I'd have an emergency plan (airbrakes out,
trim back to best L/D or thereabouts, and don't mess with the controls).

Many glider pilots can't practice because cloud flying is generally
illegal in their countries.

3) Special training is required to survive a cloud
flight.


Not to survive (see 2 above), but to fly intentionally and successfully
in cloud you need either training or an effective self-teaching
programme (see next point).

4) You can train yourself.


In theory you can - my self-training programme is derived from the
writings of pilots, some of whom who taught themselves. I can't say yet
whether it's a successful programme, or whether I'll carry on cloud
flying if I do manage to teach myself successfully. The only thing I'm
comfortable about is that the way I'm approaching this is not
excessively risky.

5) Special instruments are necessary for cloud flight.


Definitely. The acknowledged minimum is bank indicator (e.g. T&S) and
ASI. From previous posts, Tru-Trak is not a true bank indicator, which
means that its limitations need to be understood when using it.

An artificial horizon is clearly easier because it gives you bank and
pitch simultaneously. However, as the earlier poster who actually uses
one points out, you need a T&S as backup in case the horizon fails. This
is why I'm starting with T&S/ASI alone - the backup's no good to me if I
can't use it. My reading suggests that relying on a horizon alone (which
is effectively what you're doing, even if you have a T&S fitted, if you
can't use it) is riskier than I care for.

6) Instruments are worthless in a cloud.

Definitely no, if you mean horizon/T&S/horizon. Other instruments
(except, I understand, a Bohli compass in the hands of an expert) are
little or no use for maintaining control in cloud.

Following RAS for years this seems to be a fairly typical
example of group guidance. The truth I suspect lies
somewhere between the lines. Interesting to read however.

Like all RAS postings, you get a mix of experience and hearsay. Looking
back over the thread, only four posters (including me) stated they had
any experience of flying in cloud, though from the comments of some of
the others they might also have done this.

I tend to give rather more weight to postings which come from the
pilot's own experience, which is as good a way as any other of sorting
the wheat from the chaff.

My advice to the original poster, from someone with approximately 1 more
hour/6 flights in total cloud flying than he has, is to save his money
on the Tru-Trak. Practice the benign spiral instead, as you never intend
to fly in cloud intentionally. My hour has taken me to the stage where I
am not completely out of control in cloud, but definitely not fully in
control. All this in the easiest of cloud - intentional entry, gentle
lift, little turbulence. Caught out by a wave gap closing does not
strike me as the ideal conditions to begin your own training programme.