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PSS Tornado GR1


Phil Cooke
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August 2014 saw the 40th Anniversary of the first flight of the Panavia Tornado, or the Multi-Role Combat Aircraft (MRCA) as it was then known. The first British assembled aircraft P.02 - XX946 - flew from BAe Warton in Lancashire on 30th October 1974.

tornado profile 2.jpg

Discussion towards the end of this flying season suggested a few PSSA members were quite keen to mark this event with an informal group build of PSS Tornados, based on the well established plan by one of our founder members, Andy Conway.

With any luck we should see half a dozen examples at our first PSS event next year in April. I’ve just made a start on my model, I wanted to build an early GR1 example and as such I’ve spent the past few modelling sessions modifying the plan from the originally drawn longer, sleeker Tornado F3.

tornado profile 1.jpg

The scale is roughly 1:14 and I’ve decided to go with an interchangeable wing idea, forward swept at 25 degrees for normal slope conditions, and a 40 degree semi-swept wing planform for those ‘higher octane’ days.

The foam wings have been drawn, ordered and manufactured, a canopy and some super little pilots have been ordered too – more on all this later. With some woodwork now underway I’ll aim to keep you posted on progress as the build continues.

Edited By Phil Cooke on 22/11/2014 14:24:11

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A overview of the excellent Tornado F3 plan by Andy Conway.

tornado plan.jpg

I've made modifications to alter the nose profile and shortened the fuselage behind the cockpit to better capture the GR1. In plan, I've also very slightly slimmed the fuselage behind the wing and towards the tail as my calcs showed it was a little too porkly here. The fuselage is all built up and is built in 2 halves, front and back which interlock later in the build... as ever, the first job is to make yourself a kit of parts from the drawing.

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Good evening Tony, yes - it's a nice plan, as with all of Andy's stuff it's well drawn and nicely laid out with lots of helpful sketches aiding visualisation of the assemblies as they come together. Handy in this case as the fuselage assembly is quite unconventional!

I do know that Andy built a version of this model in the past with a swing wing mechanism, it worked well too - but I'm not going that route, opting instead for an interchangeable pair of wings with different sweeps.

Having talked sections with Andy Blackburn, I've chosen the SD6060 aerofoil, I've maintained scale sweeps and tapers but have gone up a little on both chord and span, as you can see from the 3-view further below.

I sent my sketches to Barry Johnson at Foamwings and in what seemed like no time at all I had my 2 pairs of wings on the bench. Each panel is beautifully crafted with L/E fitted and shaped, the veneers are epoxy vac bonded and the roots cut correctly for the required anhedral. Upon request, Barry even included a 1" strip of glass cloth under the veneer along the T/E top and bottom to stiffen the panels where they taper out.

tornado foam wing layout.jpg

The 3-view below shows the 2 sets of wings as modelled, the red wing with 25 degrees LE sweep, the grey wing with 40 degrees LE sweep.

3-view wing.jpg

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Thanks all, glad to have you along! Mark have you started your Tornado yet??

Hiya Olly, yeah as Andy stated we discussed our requirements with Sean at Real Model Pilots after we met them on their stall at Gaydon LMA in October. They've been brilliant, they've modelled our exact requirements right down to hand and head positions and even helped produce the Mk10 ejector seats that the Tornado uses - I'll add more detail later in the blog (I've not received the pilots yet and they'll need painting when they do arrive) but would highly recommend the service if you want anything a little different. As an example, our pilots and seats are modelled to 1:13.7 scale nerd - you certainly wont find them in your LMA!!

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About time I showed a bit of progress blush ...

I spent a little time kitting some parts from the plan, starting with the forward fuselage assembly. The nose profile is 1/8th light ply, the rest of formers 1, 2, 3 and 6 are balsa. Andy's plan (drawn on CAD) now includes a number of key slots allowing the formers to interlock with the fuselage floor and sidewalls - a little more cutting now leads to an easy assembly.

formers 1.jpg

The fuselage floor is made up of a number of butt-jointed balsa sheet sections, with a hard balsa spine for rigidity.

fus base 1.jpg

Slots are required in the base to accept the formers. I chose to add 1/4" triangular section along the edges instead of the 1/8th sq strip shown on the plan and the formers were modified to suit.

fus base 2.jpg

Formers dropped into position, ready to accept the forward fuselage sides. I need to decide where the Rx Battery needs to sit and cut holes in formers 2 and 3 accordingly. The channel in these formers will allow a 3/4 depth cockpit bathtub.

front fus 1.jpg

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Eh...a little bit, happens I'm at the stage where I know that -2 litre pop bottles- are not big enough to mould the canopy in one go! Will have to join them on a canopy support. Any way Phil, I'm glad you went first with you 'built blog', it only seemed fair that you went first as it was your baby.

I think mines turning into a F3. For the other mk's, I'm still getting my head around the point where the intakes start near / against the canopy line in front of the navigator. Phil question is that a : GR3 and 4? I agree the body was too wide at the rear end.

Phil, I'll put a video on showing the wing sweeping forward and back quickly and it appears to happen without much trim change to plane's height or attitude, I thinking the balance point is around the wings knuckle swing point.

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Morning Mark, nice to know you are making some progress... canopies are available from Andy Conway of course if continue to find issues with the pop bottle DIY route!

Regarding your question on the fuselage length - it was only the Tornado F3 that had the longer fuselage with the additional section mounted immediately behind the cockpit - this effectively made the air intakes look further rearward, when in reality it was the cockpit section mounted further forwards...

So ALL other Tornado marks, whether the RAF GR1, GR4 or its German/Italian equivalents will have the air intake lip forward up to the canopy hoop - ahead of the navs seating position.

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Evening Cliff - yes you are right the F3 utilised more powerful engines as I understand, which were 14" longer than the GR1 engine marks - as such they protruded out beyond the T/E of the tailplanes and no doubt a couple of lengthened body panels were required on the fighter variant to fill the gap!!

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Thanks for all the info guys - Martin the link you have supplied has some great info in it on colourschemes, markings and walkarounds - great find!!

Well building has been limited during the working week, and the forward fuselage assembly is temporarily halted whilst I source 2 x SLEC wing bolt mounts which are needed to be fixed to the fuselage sides ideally before they are boxed up to the formers, so I've moved on elsewhere and made the basic fin.

fin1.jpg

Cut from 3/8" balsa - once the basic form as shown is sanded to profile I'll add the details like ECM housings. The plan shows the fin removable for transport, a push fit into a ply lined box - but I'm going to glue mine solid into the fus for peace of mind.

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