"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote:
> I'm trying to establish dimensions from a set of photographs.
>
> http://www.postlerferguson.com/work/paper-oerlikon
>
> The pictures are of a model of an Oerlikon 20mm twin anti-aircraft cannon. (Made
> entirely out of paper)
>
> I wanted to model it in POV, but I can't find any dimensioning information.
>
> All I know for certain is that the shells, which are contained in the boxes on
> top, are 0.8 inches in diameter (which gives the inside diameter of the barrel)
> and between 6 and 9 inches in length, depending on type.
>
> I estimate that the Muzzle Brakes are about 18 inches long, but if I'm right
> that would make the barrel alone about six feet long (without the Muzzle Brakes)
>
> Any assistance would be appreciated.
>
> Regards,
>
> A.D.B.

http://military.wikia.com/wiki/Oerlikon_20mm

Based on this the pipe length is ~1.4m (4.6ft), overall length ~2.21m (7.25ft).
Not sure what the reference is of these dimensions, but it sounds like you are
on similar track.

What I tend to do is dimensions everything to a uniform scale that is convenient
(in, mm, pixels).  And then scale the entire maodel after by a known ratio
between the two scales.  E.G., measuring in pixels, the approximate length from
back to front of the barrel is ~501 pixels (416x279), assuming that this is the
total length 2.210m, I would then scale the entire model by 2210/501 to get it
into mm.


-tgq

Post a reply to this message