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dodgem37

Kawanishi N1K1 Kyofu Type 11 Rex

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Thank you, Brian.  Hopefully I'll be able to catch the errors of my ways, which this post may show.

 

Thank you, Alan.  Just trying to solve the problems any way I can as they arise.

 

Thank you, Troy.  I'm glad it's out of the way, for now.  I'll get scribing it after I've looked at something else for a while.  That cowling seemed interminable.

 

Thank you, Ray.

 

Thank you, Matejko.  It has turned into something much more than I bargained for.

 

I have been re-evaluating earlier work.  Specifically the tail feathers and pontoon.

DSCN6531_zpsjr487de8.jpg

Somewhere along the line I erred in my scaling.

 

First, an evaluation of the references.

026_zpsfzmq7hjg.jpg

Note the smooth transition line from bottom to top.  The below drawing is illustrated with a 'bow wave'.  I see the front end terminating along a projected  lateral line.

 

033_zpsbpawniql.jpg

There is a transition arc at the step from top to bottom.  I do not consider this to be an accident, such as an accidental bend while handling.  It looks purposeful to me.  After evaluating it with an oval template, I determined that it is based on a 60 degree oval.  Note how the oval rises above the horizontal plane of the edge.  The oval is an inverted cup.

 

027_zpslrfjfu7c.jpg

More 60 degree oval.

 

034_zpsmzghvxfp.jpg

Note flat sides.

 

OK, back to the drawing board.

DSCN6532_zps47aihxw1.jpg

Depth of pontoon with diameter.  Smoothed the edge, terminating in a projected lateral line.  For the most part I measured every 10mm to find the bulkhead configuration.  

 

DSCN6533_zpsjdabsqdp.jpg

Depth of pontoon with diameter.  When I got to 240 the upper pontoon started to flatten out at the sides, so I measured every 5mm after that.

 

DSCN6534_zpsdwlgsipj.jpg

Half diameter of pontoon.

 

DSCN6535_zpsospsxsnp.jpg

Half diameter of pontoon.

 

DSCN6536_zpskesckxmn.jpg

Pontoon bulkheads from 2mm to 40mm.

 

DSCN6537_zpszrox3iul.jpg

From 50mm to 80mm.

 

DSCN6538_zpsl8wf5ew6.jpg

From 90mm to 150mm.

 

DSCN6539_zpselccparj.jpg

From 160mm to 190mm.  This is the rear section, after the step.  The arc is so flat that I removed it.

 

DSCN6540_zpsie6rkmd7.jpg

From 200mm to 280mm.  As long as the depth of the top-to-bottom transition edge is above the center-line of the pontoon, there is no vertical wall.  But as soon as the top-to-bottom transition edge depth becomes greater than the diameter, then a vertical wall must be inserted at the circle center-line to connect the top to bottom.

 

Thanks for looking.

Sincerely,

Mark

 

 

 

 

 

 

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On 10/30/2018 at 11:35 AM, Out2gtcha said:

Great stuff Mark, Im following this one closely to see what changes Ill need to make on my SB conversion. 

 

Yep, Mark is a mad dog alright (I mean that in a nice way, Mark).

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