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Bulkhead cutout finishing


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#1 Sammac91

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Posted 19 June 2017 - 02:32 AM

What do builders normally do with the bulkhead cutouts, do they leave the exposed foam or put something like food in the channel for durability?

#2 Jon Matcho

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Posted 19 June 2017 - 06:42 AM

You definitely don't want to put "food" in there!  :D

 

Do you mean the inner edge of the bulkheads where the holes are cut? Most leave the foam exposed in anticipation of bonding to something else.

 

However, in cases where that will not be true (leg holes), you could put a small amount of micro in there to keep the edges smooth (possibly to find out months later that you'll want to widen this area by 1/4" on each side  ;)).  

 

I'd wait until finishing and until you are certain it's worth doing, otherwise you're adding weight where it may not even be visible.


Jon Matcho :busy:
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#3 Sammac91

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Posted 19 June 2017 - 07:02 AM

Hi Jon, It's the leg cutout I was thinking about. Just seems it's a high traffic area with the chance of being chipped out over time plus the foam is just exposed there. Nothing is mentioned in the plans and I guess paint somewhat fills and seals off the foam.
Cheers,
Sam

#4 Andrew Anunson

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Posted 19 June 2017 - 09:55 AM

Like Jon said, you can just the leave leg cutouts as is.

If its going to be exposed to weather (like the fuselage sides at the canard cutout) then its good to seal it.  

 

Keep it light and simple (to help assure you get it flying someday and so that it flies light and fast).


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Andrew Anunson
I work underground and I play in the sky... no problem

#5 Jon Matcho

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Posted 19 June 2017 - 10:13 AM

It's the leg cutout I was thinking about. Just seems it's a high traffic area with the chance of being chipped out over time plus the foam is just exposed there.

 

For reasons I share with Andrew (weight and being drawn into the weeds of perfection), I suggest not doing anything until you realize you're certain that you know the best time to address.

 

With that said, I plan on digging a shallow cavity in the leg holes and filing with micro for the "high traffic" reason you identified (and it will look better).  I won't do it now because I just may increase the width and/or height of the area slightly when it's time for avionics, etc.  The more material I have to work with, the better.  


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Jon Matcho :busy:
Canard Zone Developer & Builder
Rebuilding Quickie Tri-Q200 N479E
Building Cozy Mark VI+ (widened rear)
www.canardzone.com/members/JonMatcho (I know, it's broken... for now)





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