Airco DH9 part ?

I now have the one from the other side :applause:.

Bob T.

Cheer’s AM, thank you for clearing things up.

Bob T.

The scale is used to adjust the position of the foresight wire to account for the estimated wind speed over the target. The sight would be set up prior to take off and would not be accessible during the flight. It was positioned in the bottom of the fuselage and was sighted by the pilot in his usual sitting position.

My guess is the need for taylored scales is something to do with the differing mounting points from aircraft type to type, e.g. differing angles and distances, etc?

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I believe it’s part of a Negative Lens bombsight.

Hi AM
Thanks for the info.

If this is correct, can anyone tell me why it would be type specific, I wouldn’t have thought it would make any difference to the sights if they were fitted to different types ?.

Bob T.

My initial thought was that it was something like this: http://drc.ohiolink.edu/handle/2374.OX/169022?value=Tiger%20Moth%20%28Training%20Plane%29&type=subject&focusscope=2374.OX/1&mode=browse

but that has a curved scale. I wonder if it perhaps had a ball under a venturi? 40mph windspeed sounds mightily fast to be flying a DH9 in.

Adrian

I believe it’s part of a Negative Lens bombsight.