donderdag 3 mei 2018

BUCANNEER => the challenging area rule

Clicking the 3view-collections Aerodinamikçiler.htm, the idea came to me to choose an absolutely 'one-and-only' paper model. Therefore I decided to look for an obviously complicated to draw plane first. Secondly I thought it the most efficient way to search on PaperModelers under 'Buccaneer'.
And indeed it sorted out. 
Step one:
Step two:
This was the only message referring to an existing Buccaneer.

Googling on these pictures I stumbled on the name Bruno VanHecke, but 
who is Bruno VanHecke ?
Always interesting to see the brain waves of colleague designers.

The other Buccaneer-threads on the forum were only 'looking-fors' :


Well that's clear enough. The Buccaneer.
The internet scored an amount of twelve 3views. Never happened before..  


In the Netherlands they are called (literally translated) 'sketch of measurements'. 
In the fifties these small pictures were used by the Royal Dutch Association for Aviation and displayed in the section 'Vliegtuigherkenning' (airplane recognition) of their magazine Avia Vliegwereld
Even contests were held that time.


The differences in the 3views could be due to different types.


Length and span can be accepted as 19.33m and 13.41m. 
The height, just in case, 4.95m. 
Since a half a meter long model does not fit in my showcase I chose a scale 1:75. 
With 258mm and 179mm still a model of half a cabinet wide. 

DraftSight, here we go !

Checking and scaling 3views

Now there is such a luxurous amount of 3views it's easy to put higher demands on comparing internal dimensions. E.g. three lengths in one 3view.





taking into account that the span is always arbitrary some can be gratifying


and so on


Vectorization and selection of sections
1st set-up, used on . . .

. . . sectioning (side view) of the fuselage
The upper figure represents two series of straight lines with minimal deviation from the actual shape. One along the top and one over the bottom line of the contour. Each breakpoint is provided with a vertical line indicating a possible position of a bulkhead.
Then (green dotted) lines are placed in the middle between two neighbouring verticals. 
The connection of both ends are the solid green lines of the middle figure.
The figure below checks how far (mm) these lines are deviating from the actual body-shape.

The same procedure follows on the top-view of the fuselage where, due to its expected symmetrical shape only one contour line will have to be divided.

A connection of straight lines between the copied cross-section will cause a serious offense against the fuselage's area-rule. 
Particularly the bend at the exhaust may need one extra bulkhead...

Only one was - see yellows - wishful thinking...


This should be then the 'idealised' horizontal + vertical sectioning where possible available cross sections will be inserted and adapted.
Returning to the 3views I found two identical sets of sections.
These sections are to be found on the first 3-view in this blog referring to sas.1946.com or aerofred.com which to my opinion is copied from the view below referring to britmodeller.com or rcuniverse.com. 

Hoping the latter could mean that there might be an existing R/C Bucanneer I searched Youtube, but unfortunately in vain.  
Talking about 'copying' I can rely on a certain capability as well and doing so I  chose the most essential from a circle deviating sections below.


Hoping they will not deviate too far from the obtained hights and widths  the next move is to adapt them over there an further on it's a matter of interpolation between them and with circles at the outside of the outer cross-sections.

Deviation1
canopy or fuselage ?
Bijschrift toevoegen
Bijschrift toevoegen
Bijschrift toevoegen
Bijschrift toevoegen
Bijschrift toevoegen
Deviation2
inserting sections in the side view shows (left) a vertical deviation straight forward; in order to verify - and modify - the horizontal deviation it is necessary to copy the figure to the top view (center); rotate the figure 270° (right) and apply 
(dotted green) an eventual correction in corresponence with the 'idealised' fuselage contour.
Although....

check, double check !

...and corrected
So forth going the final 'bulkheading stage' is the application of my 'little' programme the computation of developments of the sections in between.

Since I extended the dimensioning (DIM statement) from 50 to 100 I never encountered differences of some tenths of millimeters any more. In other words 'perfect fit'.

The most tedious part of drawing a paper model I think the adhesive strips.
Therefore I thought it finally time to write the tiny piece of QB64 I had in mind.


the script file

and the result

Then, the fuselage and exhaust appeared to come in conflict with one other causing to fall back on photographic infiormation.

That explained a lot and made it necessary to re-develop almost the entire fuselage. The center anyhow.
why not  connecting fuselage and nacelles ?
Grumman Hawker did it, so why won't we ? O.k. done, but as simple as it looks below it wasn't...



elevator flaps or tiltable stabilizers ?
the last Deviation ?
Looking for a tasteful texture, skin, camouflage-colour scheme, or whatever you like, I chose the two-coloured Royal Navy type and started to collect as many photos as available.
There I saw a tiny triangular intake on the leading wing edge. None of the 3views had one.
I should have read the Buccaneer's history first and thought to have to abandon the white belly...


Then this photo cured my mood swing:

the S2 serving the same squadron ? it's an S2 anyhow !
Finding the correct colour is a disaster - and who is going to tell me how close they are when the printer has done its job, let alone when they are finally varnished...
Well, there wo go



The choice is yours; ours I mean...

bit by bit. . . 

or byte-by-byte. . . 

Colours again. Again...
isn't that a shade of green ??....

Being fed up with these colours every time I opened the colour-scheme A4 from the CMR modeler's site and translated the FS codes via the Conversion Chart. 




That should do, simple mouse grey and no colour underneath at all. A stodgy model but no disappointment when the printer decides to darken or to lighten the colour I'd asked for.
let's start cutting 'n gluing

a start anyway
 backwards now

arranging certain colours/layers up or down can make a difference . . .

and finally . . .

the designer did well (almost)
the constructor didn't (at all)

but, as we say in Holland, who will care 
'since  no one is living over there' and the
top looks much more acceptable...