By Jim Mesko, Joe Sewell, Don Greer
Constructed out of the DB-7 sequence of sunshine bombers. A-20s, Havocs & DB-7s observed motion in virtually each significant theatre of operation in the course of WWII. Used as a gentle bomber, floor strafer & nightfighter. Over a hundred pictures, forty element drawings, three pages of scale drawings, thirteen colour work, 50 pages.
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Constructed out of the DB-7 sequence of sunshine bombers. A-20s, Havocs & DB-7s observed motion in virtually each significant theatre of operation in the course of WWII. Used as a mild bomber, floor strafer & nightfighter. Over a hundred photographs, forty aspect drawings, three pages of scale drawings, thirteen colour work, 50 pages.
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Additional info for A-20 Havoc in action No 144
Of course, this meant launching satellites at short intervals and required a signiﬁcant ﬁnancial budget. Thus the constellation declined. 5 years, were not enough to solve the problem. In 2002, the constellation was composed of only seven operational satellites. We are currently experiencing a renewal of GLONASS as there are now about 19 satellites in orbit,18 and the full constellation is planned to be ready in 2012/2013. The Galileo System As navigation-based applications attracted great interest in a large range of domains, from scientiﬁc to highly commercial, through military and telecommunications ﬁelds, they became a strategic issue for all the great nations.
The European Community, as one of the major political entities, decided to be a real partner in satellite navigation. 20 The second, called Galileo, is a completely autonomous satellite constellation able to provide positioning and time services. As the cost of GNSS 2 would be huge, the European authorities in charge of this program decided to go ahead with a complete review of the possibilities. At that time,21 the only “available” constellations were GPS and GLONASS. Discussions started ﬁrst with the Americans in order to ﬁnd a way to cooperate.
1 Dead reckoning was also of great importance because it was not possible to carry out the measurements and the calculations on a continuous basis. The navigator therefore needed to estimate the boat’s speed and direction, using lochs or a compass. Many factors are bound to degrade these estimations. For compass measurements, thanks to Christopher Columbus, one knew that there was a difference between the magnetic north and the geographical north (the magnetic declination). Furthermore, the metallic parts of the boat, even if partially compensated, remained of concern.
A-20 Havoc in action No 144 by Jim Mesko, Joe Sewell, Don Greer