Jilles Smits 1/3 scale SG38

Let us all watch your new project progress.
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Peter Balcombe
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Jilles Smits 1/3 scale SG38

Post by Peter Balcombe » 07 Oct 2018, 17:36

Another prototype build from a one of Jilles’ excellent plans.
Lots of drawing rolls have arrived, plus a full set of laser cut parts from Cliff Evans to make up this 1/3 scale primary glider which includes lots of rigging wires and scale pulleys for the control surface operation.
The servos are largely hidden and the Rx is buried within the pilot’s body :o
All parts have been checked against the Bill of Materials & identified on the highly detailed plans.
Just awaiting delivery of a large pile of stock wood before starting the build.

For a Primary glider there are an awful lot of parts :?
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F7AEA71D-93A4-44C1-8B3A-275216DF0062.jpeg
Lasercut parts
Last edited by Peter Balcombe on 07 Oct 2018, 21:31, edited 1 time in total.

Martin G
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Re: Jilles Smits 1/3 scale SG38

Post by Martin G » 07 Oct 2018, 21:26

Ooooooh! I will be following this build.

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Cliff Evans
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Re: Jilles Smits 1/3 scale SG38

Post by Cliff Evans » 07 Oct 2018, 21:35

Peter, have ordered a shed load of trace wire!

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Peter Balcombe
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Re: Jilles Smits 1/3 scale SG38

Post by Peter Balcombe » 13 Oct 2018, 21:00

The wood has arrived (for both the SG38 and ASK21), so I have just made a start on the rear fuselage :)
A lot of the spruce strip is for the SG38.

I have just cut the dozen or so core wooden parts for the rear fuselage structure, so will make those up into the basic framework (complete with Carbon strip strengthening) tomorrow.
Attachments
Wood pile_crop2.jpg
Wood pile

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Barry_Cole
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Re: Jilles Smits 1/3 scale SG38

Post by Barry_Cole » 14 Oct 2018, 12:36

Booo, killjoy..

:evil: :evil: :evil: :evil:

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Cliff Evans
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Re: Jilles Smits 1/3 scale SG38

Post by Cliff Evans » 14 Oct 2018, 12:38

Not at all, the secret is in that name of the forum!

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Peter Balcombe
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Re: Jilles Smits 1/3 scale SG38

Post by Peter Balcombe » 15 Oct 2018, 22:27

First up in the build is the rear fuselage frame.
This is built up with the top, rear & bottom rails laminated from various lengths of spruce & thin carbon strip as can probably be seen from the cross sectional liquorice allsort stripe appearance in the pic.
The top & bottom rails will plug into the rear of the forward fuselage 'A' frame assembly.
There are still numerous diagonals, gussets, sheave mountings etc. to be added.
Attachments
Rear fuselage structure.jpg
Basic rear fuselage frame

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Peter Balcombe
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Re: Jilles Smits 1/3 scale SG38

Post by Peter Balcombe » 20 Oct 2018, 16:34

Rear fuselage construction now complete apart from metal fittings and tailplane fixings.

I am now moving on to the forward fuselage where the first job has been to make up a steam bending template for the box structure lower rails. Once the rails have been shaped, the basic structure should go together pretty quickly.
Attachments
Rear fuselage done.jpg
Rear fuselage nearly complete

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Peter Balcombe
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Re: Jilles Smits 1/3 scale SG38

Post by Peter Balcombe » 28 Oct 2018, 09:27

Moving on to the forward fuselage, the plan advises starting by building up the basic fuselage box structure as shown on a section of the drawing.
I started by splicing together lengths of standard 36" long spruce to make the curved lower rails, then steam bent these to shape with the aid of a simple MDF sheet template (profile taken from edge of a laser cut side sheet).
The various laser cut formers etc. are then glued into place to make the basic structure.
The shaped hardwood nose block holds the tow release pin guide tube and has slots to take a 12x12x2mm aluminium U channel.
The photos show the structure placed in a mirror image jig to hold the lower rail in shape whilst glued to the formers. (the yellow tape is used as a release layer to prevent the rail from sticking to the template.)
The other photo shows the assembly less laser cut the top & bottom sheets which will be added once the aluminium channel has been fitted up front.
Attachments
Fwd_Fuz_in_jig.jpeg
Fuselage in lower rail jig
Fwd_Fuz_less_TopBot.jpeg
Structure less top & bottom

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VinceC
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Re: Jilles Smits 1/3 scale SG38

Post by VinceC » 28 Oct 2018, 09:32

Looking quite interesting and great work again from Jilles

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