# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Hp by Doniol for Aircraft
From: Hanno Ix
Date: 2014 Dec 3, 12:50 -0800

Greg,

that's dapper!

The CHIC seems to show 4-digit multiplication results.While I don't think 4-digt results were a necessity in this flight it would nevertheless baffle me since you are using a circular slide rule with only 8" diameter I believe.

I assume you did both, the flying and the CelNav.There are some interesting issues from a pilots point of view:

Was there a particular technique to operate the sextant and the yoke simultaneously? That sounds tricky.

I suppose you planned for the direction of the field of view during flight so you could see the sun all the time, correct? Now, if you had to change direction to see the sun - say as much as 90 deg - that would cause  a possibly large deviation from a straight line between waypoints. How would one handle this?

While I am familiar with a glider's cockpit - very, very tight! - I have no idea about cockpit management in a Cessna. Therefore I wonder, how did you organize your cockpit for sextant, paperwork, maps and slide rule?

Assume Francis would succeed in making his BN and it would be sufficiently accurate. Maybe its size would be abt 12 by 12 . Could you accommodate a BN of this size?

H

________________________________________________________

BTW: I found a formula for the dip in minutes using hav: dip = - 27*ahav (10e-7 *h);
h is the height of the eye in feet. It is pretty accurate. Try it.

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