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May 27, 2007, 10:31 AM
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chris williams's Avatar
Build Log

1:3.5 Scale Skylark 4 Build


The Skylark 4 was the penultimate wooden glider from the Brit Slingsby concern, just before the Type 51 Dart. This is the prototype build upon which my Traplet plan is based.

01: The fuselage profiles (keels) are pinned down on the plan and the fuselage half-formers laid down for the port side...

02: The ply cockpit aperture liner and the main rear longeron meet up at the same former. Note scrap wood to temporarily hold everything together

03: Using the power file to rebate the former for the ply 'biscuits' that tie the rear and front sheeting together

04: Now the planking begins at the front with strips of 1/16" ply. These are applied in batches of three, being scored into the wood and bent to roughly follow the curvature of the formers

05: View of fuselage rear: note 1/4" balsa diagonals to keep the fuselage rigid

06: Scoring up the planking: pliers are used to crack the plywood along the score line
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May 27, 2007, 05:11 PM
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erich's Avatar
Beautiful start. In 04 it almost looks like a planked ships model. What type of glue are you using? And what is a power file? Thanks for posting this, sure hope you keep the posts up, till it's done.

erich
May 28, 2007, 05:47 AM
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chris williams's Avatar
Erich, the planking is 1/16" ply and the glue is white glue, but it gets some serious reinforcement a bit further down the road...

The power file is by Black & Decker, costs abour 35 here, and is an indispensable bit of kit. The abrasive belt rotates around at a fair speed and is able to get in most otherwise awkward corners
May 28, 2007, 06:01 AM
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chris williams's Avatar
Once enough planking has been applied to the front, the fuselage half-shell can be removed from the board...

01: Now the other half-formers have been added

02: Close-up of the joint where the rear sheeting and front planking meet

03: One of the secrets of planking with ply is to force the planks together with masking tape at the same time as pressing them into the formers

04: Lower planking nearly complete, not a pretty sight at this stage...!

05: Most of the formers at the front end are temporary and will soon be removed. The preliminary bits of glass cloth are to hold it all together whilst the formers are removed

06: Front end planking now complete...
May 28, 2007, 03:24 PM
Scale Nerd!
Wight's Avatar
Quote:
Originally Posted by chris williams
Erich, the planking is 1/16" ply and the glue is white glue, but it gets some serious reinforcement a bit further down the road...

The power file is by Black & Decker, costs abour 35 here, and is an indispensable bit of kit. The abrasive belt rotates around at a fair speed and is able to get in most otherwise awkward corners
I went out and bought one of these after seeing it in one of Chris's previous build logs. It is fantastic, one of the best labour-saving tools I now have. The great Sage Williams speaketh sense. Get one!
May 28, 2007, 04:13 PM
TEAM GORGEOUS
SZD16's Avatar
They are a very nice looking tool.......I also looked for one after seeing it in Chris's Mini build thread....but to no avail.....seems that they are a UK/Euro only tool......could not locate anything like it in the US for that price....I found some air powered ones and one electric one but all where over $250 US. Anybody this side of the pond know of a supplier?
May 28, 2007, 06:44 PM
Registered User
something similar....

http://naturecoast.com/hobby/cordless.htm
May 28, 2007, 07:07 PM
Which way is it going now
mstone's Avatar
If you are flushed with funds the Makita version is nice.

http://www.makita.com/menu.php?pg=product_det&tag=9032
May 28, 2007, 07:39 PM
TEAM GORGEOUS
SZD16's Avatar
Quote:
Originally Posted by mstone
If you are flushed with funds the Makita version is nice.

http://www.makita.com/menu.php?pg=product_det&tag=9032


That's the only one I've found........at $210 US....it's nice but not that nice!
May 29, 2007, 04:51 PM
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chris williams's Avatar
01: Attention moves the tailplane mount prior to adding top ply sheeting

02: View of wheel mounting

03: Thin card is used to make a template for the top sheeting

04: After cutting out to shape, the ply is wetted, rolled with masking tape and heated to induce some curve into it. (A boiling kettle works even better)

05: The sheeting is stretched into place with tensioned masking tape and the edges held flush with clothes pegs
May 31, 2007, 03:20 PM
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chris williams's Avatar
Before any more can be achieved with the rear of the fuselage, the tail group must be assembled in order to sort out the elevator linkage, rudder cable routing etc...

01: 1st stage of tailplane construction

02: The space between the centre ribs is filled with block balsa so that the retaining bolt has something solid to go through

03: Holding down the sheeting with the ever-handy masking tape

04: 1st stage of elevator construction: the false LE is cut using the the tailplane TE as a template

05: Elevator ready for final sanding after being hinged to the tailplane...

06: As with most Slingsby sailplanes the elevator/tailplane hinge joint is not conventionally shrouded...
Last edited by chris williams; May 31, 2007 at 03:26 PM.
May 31, 2007, 03:28 PM
Registered User
Seadog's Avatar

Stab TE Question


Chris,

Is the TE of the stabilizer straight on one surface and tapered on the other, or do both sides taper? Pic 1 looks like the TE is flat on the building board.

Dave Smith
May 31, 2007, 04:19 PM
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chris williams's Avatar
Yes Dave, the top surface is flat, the underside tapers. The 3-view is not clear on the subject, but it's convenient to built it this way...
Jun 04, 2007, 04:20 PM
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chris williams's Avatar
01: The fin post is attached temporarily to the rear of the fuselage and the bottom rib glued in place to ensure it's at the correct angle

02: Now it is removed and the next two ribs cyano'ed into place

03: Once the false LE is added, it acts as a guide to the remaining ribs

04: The basic fin structure is complete

05: The rudder is built in a similar fashion

06: Finalising the fin/rudder interface after hingeing: it's much easier to do this before fitting permanently to the fuselage
Last edited by chris williams; Jun 06, 2007 at 12:39 PM.
Jun 05, 2007, 09:31 PM
Registered User
Nice work Chris!!!


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