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Jun 14, 2019, 09:17 AM
Father by day, hacker by night
JornWildt's Avatar
Hi Sparks - your work is much appreciated. I really enjoy following along, so thanks!
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Jun 26, 2019, 03:51 PM
RC 4 Life
sparks's Avatar
Thread OP
Thanks all, I hope the threads are encouraging to try new ways to work with foam.
There was a time when I was a freak at the field showing up with foam models.
About 1988
Jun 26, 2019, 03:54 PM
RC 4 Life
sparks's Avatar
Thread OP

Hatch


Your fuselage should be coated with fiberglass cloth by now and perhaps even an application of weave fill.

Draw lines connecting the holes you made to mark the hatch location.
Cut the skin away slightly toward the inside of the lines and start pulling off the skin.
Yes, I know the glue sticks very well.
Sand the skin flush with the balsa supports then start removing the portion of the formers you pre cut.
Jun 26, 2019, 03:57 PM
RC 4 Life
sparks's Avatar
Thread OP
Sand the ends of the hatch hole to a slight angle so the hatch will be easy to remove and line the ends and sides with balsa.

The foam block you see will become the hatch but for now it is being used to apply clamp pressure to the balsa liner.

Take your time sanding the angles into the foam block, it will make the next few steps easier.

Donít worry about small gaps the Gorillia glue will fill them.
Jun 26, 2019, 04:00 PM
RC 4 Life
sparks's Avatar
Thread OP
Make a set of balsa plates to match the hatch hole opening sides.
Put sandwich wrapping plastic along the edges of the hole and install the balsa.
Apply gorilla glue to the hatch and put it in place.
All that is left is to sand the hatch to match the contour of the fuselage top.
Donít try to remove it just yet.
It will be a very tight fit and must be pushed from the inside to avoid damaging the surface.
Jun 26, 2019, 04:13 PM
Father by day, hacker by night
JornWildt's Avatar
Neat trick, sanding the hatch flush that way :-)
Jul 09, 2019, 07:58 PM
RC 4 Life
sparks's Avatar
Thread OP

Hack and whack


Now it is time to hack at the belly.
If it looks like I donít know what Iím doing you are spot on.
I have never attached a wing to a constellation.
I went with the lines drawn on the formers because that came off my plans.
The pin was used to transfer the lines drawn on the formers to the outside of the fuselage.
I marked the pin holes and drew guide lines and cut to the inside of the line.
Turns out the layout was so close it was easy.
There was just one hiccup, the forward wing attach block was not there. This has been added to the plans and shouldnít be a problem for you.
Work slow, you have all day.
Jul 09, 2019, 08:02 PM
RC 4 Life
sparks's Avatar
Thread OP
For the final fitting I put the fuselage on the wing and used sheet foam as a guide to draw the final trim line.
In hind sight I should have used a thin sheet of wood since this piece forms the bottom of the wing fairing.
Later you will see I had to add balsa to the inner edges to toughen it up mostly for handling.

So, sand the formers to match the wing contour.
The black marks on the edge of the fuselage skin is where the wing trailing edge falls.
Just forward of the marks is where the wing attach bolt structure will be installed. In your case it will already be there.
Bond the wing saddle base to the fuselage skin and formers.
Jul 10, 2019, 09:47 AM
Bronco Team Builder
Wade Joos's Avatar
You are amazing.
Always a treat watching you work.
Thanks for sharing
Jul 10, 2019, 03:45 PM
RC 4 Life
sparks's Avatar
Thread OP
I wish I could put it all on threads .
With a full time job and a website to run my time is not my own.
The 1/4 scale BD-5 is waiting for time for a test flight.
The 737 just flew and did great.
And the S-3 Viking is on the bench getting the nacelles fitted.

So many planes and so little time.
Jul 10, 2019, 07:55 PM
Electric Coolhunter
Thomas B's Avatar
Quote:
Originally Posted by sparks
I wish I could put it all on threads .
With a full time job and a website to run my time is not my own.
The 1/4 scale BD-5 is waiting for time for a test flight.
The 737 just flew and did great.
And the S-3 Viking is on the bench getting the nacelles fitted.

So many planes and so little time.
I literally have no idea how you get all that done.

A lot of it is a focused and highly skilled approach to what you do. But, still. Wow.

A Connie will be mine, some day, some how....
Latest blog entry: RC events for 2019!
Jul 11, 2019, 04:03 PM
Registered User
ErcoupeEd's Avatar
I am enjoying this thread Sparky,
and being inspired to build one of two airplanes.
I recently bought two sets of plans for a 100 inch wingspan T28 Trojan and
make the fuselage profile scale and cut the wings with a hot wire foam cutter laminating 2sheets of 2 inch thick foam
to get thge proper airfoil thickness.

Then try the same thing with an 82 inch P47 Thunderbolt.
Both airplanes will be electric.

I'll use one set of plans each to make my patterns from and the other set to build with.

Using two 2 inch thick sheets laminated with two two one inch sheets for the fuselage to give me a 6 inch thickness, then carve and sand it down
to shape.
Possibly install retracts in each one.

I have both of your books also.

Hope I didn't misspell much.
I just had cataract sugery on both of my eyes over this past month, and using reading glasses to write this.
By the way, I can see again!!!
What a difference this surgery has made!
Medicare paid for most of it.
I opted for the more expensive toroid lenses, but the Doc says I'll be able to ditch my glasses that I have worn for 47 1/2 years!
The procedure is absolutely painless and no discomfort!
So great to be able to see colors much more vividly!
And my distance vision has been restored!!!
Last edited by ErcoupeEd; Jul 11, 2019 at 04:13 PM.
Jul 12, 2019, 04:17 PM
RC 4 Life
sparks's Avatar
Thread OP
Tom, we really need to get together for a trade -A- plane day sometime.
You have your share of eye openers too.

Ed, glad the surgery went well, I think that was probably the real inspiration but thanks anyway
That 100 inch T-28 should be a fun project just don't skimp on the power.
That 1/4 scale P-40 taught me a lesson about parasitic drag.
Jul 15, 2019, 03:04 PM
Registered User
Sparks,
Any info on the 737 that just flew? Pictures, availability etc...
Jul 16, 2019, 11:58 AM
Registered User
dion9146's Avatar
Nice build Keith. I know it's tedious, but your build threads are always an inspiration. I'll bet I went through the P-40 thread at least 5 times before even buying your book! Even though my current build is a pile of spruce, bass and balsa sticks trying to become a scale glider, I still have another sheet of 1" foam itching to get sliced into sheets for the next project!

Your efforts are very much appreciated.


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