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Volume 29 - October 1976

Contents

Page 4 of 5

Record

Forum

  • Saving Money by Cutting Corners

  • J. D. Proctor
  • Published online by Cambridge University Press:
    01 October 1976, pp. 418-420
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  • This note assesses the savings in (time- and fuel-dependent) direct operating costs that are possible if every turning point on an airway is passed on the inside. Figure 1 shows a route with turning points at A, B and C. If a pilot follows the standard procedure of flying along AB until he is sure that he has passed B, his total track distance is (c + d + a + b).

    To simplify the mathematics let us assume that he turns instead through half the required angle at a distance d before he reaches B and completes the turn after passing B abeam (and very close). His track distance will be (c + e + f). The difference in distance δ, representing the saving, is therefore (d + a + b) – (e + f).

Reviews

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Review

Forum

  • Matthew Flinders and Ship Magnetism

  • W. F. J. Mörzer Bruyns
  • Published online by Cambridge University Press:
    01 October 1976, p. 420
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  • Readers of Captain Cotter's paper under this title in the April 1976 issue of the Journal may be interested in some evidence that Dutch seamen in the seventeenth century were aware of this phenomenon of ship magnetism.

    Abraham de Graaf in De seven Boecken van de Groote Zeevaert, published at Amsterdam in 1658, warns ships' officers taking bearings with the compass-that metal objects in their clothing can seriously deflect the compass, and mentions iron buttons and buckles. This was an important contemporary work on navigation and de Graaf was an examiner of officers of the Dutch East Indies Company from 1679 to 1714.

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Front matter

  • NAV volume 29 issue 2 Cover and Front matter

  • Published online by Cambridge University Press:
    23 November 2009, pp. f1-f14
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  • NAV volume 29 issue 3 Cover and Front matter

  • Published online by Cambridge University Press:
    01 July 1976, pp. f1-f12
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Back matter

  • NAV volume 29 issue 2 Cover

  • Published online by Cambridge University Press:
    23 November 2009, p. b1
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Index

Back matter

  • NAV volume 29 issue 3 Cover and Back matter

  • Published online by Cambridge University Press:
    01 July 1976, p. b1
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Front matter

  • NAV volume 29 issue 4 Cover and Front matter

  • Published online by Cambridge University Press:
    01 October 1976, pp. f1-f14
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Back matter

  • NAV volume 29 issue 4 Cover and Back matter

  • Published online by Cambridge University Press:
    01 October 1976, pp. b1-b5
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Record

  • Ian Michael Hunter

  • Published online by Cambridge University Press:
    23 November 2009, p. 105
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Reviews

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