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Old 06-15-2016, 05:50 AM   #1
east6008
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Sopwith STLBP


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I started a “Hawker’s Runabout” or the SLTBP (Sopwith Land Tractor Biplane)
This was the ancestor of the Pup. and has appeal to me, because I dont
have to paint the nice woodwork, or make ailerons, because it had
wing warping.
I am using an Aeromodeler plan of the Pup as a basis, and a, looking forward
to covering the model with white Coverlite (which is a great covering)
I have lots of 1/16" sheet, and stripped my own spars and lead edge laminated,
using a homemade stripper. I made to plexiglass ribs to use for the sandwich
method making ribs (4
The photo shows the Pup I made in 1961, freeflight (3)
Balsa stripper (1)
Plexiglass ribs (2)
Laminated spars at bottom
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Old 06-15-2016, 07:16 AM   #2
michaely
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Re: Sopwith STLBP

Please do post more photos of the model, especially the wing warping controls.

Nice picture of the full size plane.
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Old 06-15-2016, 09:03 AM   #3
Sukhoi 68
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Re: Sopwith STLBP

sub'd to this one!! Very cool choice.

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Old 06-15-2016, 06:40 PM   #4
east6008
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Re: Sopwith STLBP

Photos of this airplane are scarce online.
I found a better shot, and looks like it has a lot fewer ribs than the Pup,
I count 8 bays per panel, thought I had to make 48 ribs. Wing warp
control would have needed a lighter structure than the Pup.
All wing panels look to be the same, since the cabane struts come
up vertical.
I included a shot of my home made stripper, handy for making rib
blanks from all my scrap balsa

PS Dont those guys look they are having fun?
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Old 06-24-2016, 07:30 AM   #5
east6008
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Re: Sopwith STLBP

Moving along with Hawkers Runabout, it is always nice to get shavings on the
floor with a new model. I made 36 rib blanks the proper height and length,
then lightly stuck them together with a glue stick, with plexiglass pattern ribs
on each side. The stack held together good for carving and sanding, then
separating the ribs was easy.
Since all wing panels are the same, I made 3 sets of duplicate wingtip pieces
based on what I arrived at on the first panel. I deviated from the Aeromodeller
plan on the wingtips--I dont like wingtips tapering from the top.
I also needed fewer ribs, since the Runabout has only 8 ribs panels per wing.

There is a free download of the plans I am using, from Outerzone
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Old 06-25-2016, 08:19 AM   #6
east6008
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Re: Sopwith STLBP

When the glue dried for the first wing panel I built, I was surprised to see
how wiggly the trailing edge was. The glue was ok, but just not enough
glue surface. So I glued 1/32" balsa gussets on the bottom of each rib.
Did the trick, but lots of fiddly sanding ahead.
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Old 06-28-2016, 09:27 PM   #7
Ken L
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Re: Sopwith STLBP

Looks like a potential Cat-astrophy to me!

Brings back memories of childhood modeling vs the family cat!

Keep up the build and thread. Very nice, unusual choice.
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Old 07-04-2016, 11:01 AM   #8
ishmatt
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Re: Sopwith STLBP

Very nice indeed
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Old 07-06-2016, 03:26 PM   #9
east6008
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Re: Sopwith STLBP

As with any WW I airplane, what about wheels?
Forget about store-bought....nothing the right size.
I never had good results with rubber tubing, never could find the
right size.
I turned a couple from balsa, nice and light, and they wont roll on
much asphalt anyway.
I found a piece of foam tube at dollar store exactly the size I need,
so will try to fill the pores and sand them round
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Old 07-08-2016, 07:01 AM   #10
east6008
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Re: Sopwith STLBP

1/8" spruce fuselage, trying something different--since the cabane struts
go straight up, I ran them through the top longeron, right to the bottom.
Bamboo kabob sticks. Of course a doubler is needed on the top longeron,
making the fuselage frames "sided"

Covered one of the wings with white Coverlite--used glue to attach it,
rather than balsarite and heat gun, I got the clear doped fabric effect I wanted
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