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Thread: What is the value of the mile in ORBís?

  1. #11
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    Default Re: What is the value of the mile in ORBís?

    I was looking for the position of the crash of this Boston AL.278 on January 29, 1943 during Ramrod 50, because, in one of the rare books devoted to this event, ďMorlaix January 29, 1943 - The bombing of the viaductĒ by Michel Le Bars - 2005, the position given by the author of the fall of this aircraft is ďlatitude 49į 26' North and longitude 00į 39' West, in the bay of the Seine about 100 km North of Caen and 200 km from the headland of CotentinĒ. Which in my opinion was absolutely impossible, and must have been an error reading an archive source (which I did not find, neither in the ORBs nor in the appendices).

    In fact, 49į 26í N and 03į 39" W makes much more sense.
    The second box of 6 Bostons of 226 squadron was attacked by a dozen Fw.190s around 02:25 pm 16 miles from Morlaix as it had just passed the coast just East of Plougasnou, heading for Exeter. The fight lasted 10 minutes, during which the Bostons, with their evasive actions, could hardly cover more than 40 miles. S/L Foit of 310 Escort Squadron saw a Boston after the attack with the starboard engine on fire. He stood close and saw it crash into the sea. Then he climbed and gave a fix. Certainly this 49į26í N 03į 39í W (which I couldnít find).

    This position fits well with calculations that can be made with combat reports. Possibly less in latitude, at least on a Plougasnou-Exeter axis. This gives an area of ​​several km2, or even several tens of km2. As for finding the wreck, that's another insurmountable problem.

    Regards.

  2. #12
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    Default Re: What is the value of the mile in ORBís?

    Geneca: Your analysis of the situation is probably more thorough than that of the author Michel Le Bars. I would follow your intuition, but continue to search other records. Have the coordinates for the route survived? Have you found the orders from “Group” possibly contained in some surviving Form “B” somewhere? The routes for Bomber Command operations are available in several source material. I think the route for this operation must be archived in some document or another. Of course adhering to the route would be of least concern in the middle of a difficult combat situation.

    Jim
    Last edited by JDCAVE; 9th June 2021 at 16:57.

  3. #13
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    Default Re: What is the value of the mile in ORBís?

    Also might depend on which type of 'Fix' that S/L Foit got - if he climbed and got a triangulation Fix from 2 or 3 Ground Stations then it may be fairly accurate.
    I believe also that there were different 'classes' of Fix depending on how many ground stations were used and perhaps the distance involved ?

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