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Touche

John Palmer's elegant F3A from the late 1980s

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Martyn K28/11/2018 09:21:23
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4805 forum posts
3498 photos

At the UKCAA @ Huddersfield event, one of the HDMAC members brought along a very nice epoxy glass fuselage - already primed. After some deliberation, it was established that it was a Touche a very elegant design reminiscent of the Aurora.

So for the princely sum of £25 I bought the fuselage but with no drawings or plans to go with it.

From a FB posting, I was put in touch with John Palmer who provided me with some sketch drawings, followed soon after with some better scans from a kit that Andy Green had.

Glass fuselage and Foam wings. It must be ARTF. laugh

With that info, I ordered a set of wing and tailplane cores from Bill Manley (Bil Kits) and made a start on the fuselage. Now, the idea is to build this while glue is drying on the Fury and the Rearwin Speedster, so updates may be a little slow.

Power will be a pumped Webra 61RE Redhead on a pipe (of course) that I used in my Magic which got decommissioned a couple of years ago.

The first task is to get the firewall into place. The template that Andy scanned for me gave me the outline but the first major problem is that there is no obvious datum to measure from. The drawing says 3 degrees right thrust and 1 degree down so the former was marked up, drilled and the nylon mount fitted.

The only thing that I could use was the vertical (I hope) LE wing seat to measure from so with a piece of wood as packing (to clear the flange) the location of the former was very carefully measured and skewed and tilted to compensate for the down and side thrust.

fus4.jpg

The engine is fitted so that I can check the alignment at the nose ring. When happy, the firewall was epoxied into place and allowed to set.

fus5.jpg

With a spinner fitted and a 2mm adjustment in height that doesn't look too bad.

The mount is bolted to the firewall using 4mm rubber rawlplugs

fus7.jpg

These have a lock nut and washer on the back. You can see the small gap between the mount and the firewall. This is a sort of poor mans soft mount. It certainly seems to work on my Mama Mia and helps isolate the engine from the fus - hopefully keeping the noise down.

fus3.jpg

Although not shown on the drawing, I added a nose ring from 3mm liteply

fus6.jpg

Last week the wings and tailplane arrived from Bill. I have to admit that these are some of the nicest foam panels I have ever seen. Perfectly finished and a quick check on the sweep back showed they were perfect.

wing1.jpg

The fuselage was put aside while I made a start on the tailplane.

LE and TE cut from sheet balsa and glued with a very thin smear of Gorilla polyurethane glue

tail1.jpg

These were sanded to profile and the tailplane tips laminated from 2 of 1/2" sheet

tail2.jpg

The tailplane fits in a slot in the fuselage. This already had a moulded flange, so this was opened up carefully (using a dremel with diamond cutting disk) until the tailplane fitted, checking that it was central and horizontal using the string triangulation method

tail3.jpg

When happy, the edge of the flange was marked onto the tailplane and the two halves glued then glassed together

tail4.jpg

This wont get fitted permanently until the fuselage gets painted

The wings have also had the LE and TE fitted and sanded to profile.

wing2.jpg

Next job will be to fit retracts. I have some s/h rom air retracts that I intend to use but I am waiting for some airline to test them before I commit to fitting them. I also need some beech bearers from the LMS as well, so I may as well crack on with the Fury while I am waiting

More to come

Martyn

Edited By Martyn K on 28/11/2018 09:22:01

Rich too30/11/2018 05:03:10
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2876 forum posts
1046 photos

I like your builds Martyn, sub’d yes

Nigel R30/11/2018 08:23:25
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2483 forum posts
406 photos

Very nice! Was this a pre-turnaround design?

Was there ever a plan for this one?

It doesn't look like it will take too long to put together, either. yes

You've probably seen this already - Hobbyking sell all the air retract clobber for very little cash. I think I priced about £20 to get all the bits needed (I picked up a set of second hand spring air Robarts a while ago).

https://hobbyking.com/en_us/air-retract-pipe-d3x1-7mm-1-mtr.html

What are the beech bearers for? If it is the retracts, do you think the ply + dowel method would be worth using - it seems a stronger set up?

Martyn K30/11/2018 22:22:48
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4805 forum posts
3498 photos

Thanks. It is a post turnaround era model - I think it was about 1988 or 1989. Its a very pretty aeroplane

I hadn't seen that HK link. Many thanks, that's very helpful.

Beech bearers will be for the retracts, I am not aware of the ply/dowel method, can you let me have some info on that please?

A bit more work on the fuselage.

fus8.jpg

3mm ply reinforcement for the wing dowel locating peg. The original used a 3mm ply plate in the wing slotted into this, That is still an option. I have also added a couple of enlightening holes. All these grams help.. The little curve at the top is to get round the seam where the two halves were joined together.

fus9.jpg

The front of the belly pan after about 30 seconds on the disk sander I really like the air intake shape that has appeared.

fus10.jpg

Reinforcement disk at the rear of the belly pan. This will be located with a couple of steel pins, I'll probably use panel pins..

fus11.jpg

The rear of the wing mount. The fus has been opened up to accommodate the pipe. The rear cone fits in here and the exhaust exits about 50-75 mm further back

fus12.jpg

The belly pan is located by 3mm ply tabs that are fitted to the fuselage and locate the edges of the pan. These are plugged into 3mm ply rails that fit inside the flange

fus13.jpg

Two rails sit in front of the wing two under the wing. The play rails are slotted then glued into place. The dremel with a diamond cutting disc was very useful here..

fus14.jpg

With the tabs fitted and sanded slightly - needs a bit more work yet. Next job will be to fit tabs in the belly pan, but I haven't fathomed out from the drawing how to do that yet.

More to come

Martyn

Martin McIntosh01/12/2018 18:37:01
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2737 forum posts
1026 photos

If this is what I am thinking that you are trying to do with a ply plate then do not dowel it in. In the event of a hard arrival a plate by itself will just rip out and is easily glued back in. With dowels it would wreck your wing. I know this from bitter experience.

Martyn K01/12/2018 20:14:51
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4805 forum posts
3498 photos
How would you mount retracts in a foam cored wing Martin?
Nigel R01/12/2018 22:41:26
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2483 forum posts
406 photos
Martyn the ply method is straightforward enough. Cut a ply plate about 2x3. Six lengths of quarter inch dowel are glued to it at right angles. After drilling suitable holes of course. Dowels are about an inch or so long. The retract mounts to the ply plate. Plate is sunk into wing surface. The dowels poke into the foam. They simply provide more anchorage for the plate.

Edited By Nigel R on 01/12/2018 22:42:16

Martyn K02/12/2018 22:16:36
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4805 forum posts
3498 photos
Thanks Nigel. I'll have a think about thar
Chili Pants04/12/2018 11:00:52
16 forum posts
13 photos

Martyn, not sure if this is of any use to you but here is a photo of one my father completed but never got to fly.

Very much along the lines of the Aurora

So nice to see these classics being kept alive.

r0010057.jpg

Martyn K04/12/2018 22:25:31
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4805 forum posts
3498 photos
Thanks CP
That looks really nice. That colour scheme makes it look very much like the original Naruke Aurora.
It looks beautifully finished as well
Chili Pants09/12/2018 10:48:05
16 forum posts
13 photos

How are the retract mountings coming along? looking forward to seeing some pictures of these.

Regarding the finish on his Touche, I came back to modeling around two years ago and one of the things which sticks in my mind that my father said, he built models for more than seventy years and always strived for perfection, but this was the one thing he regretted doing.

His advice to me was that it does not matter what they look like on the ground, its how they fly that counts, build as best you can and don`t worry about imperfections.

Martyn K09/12/2018 20:06:53
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4805 forum posts
3498 photos
Sorry but I haven't made much progress in the past few days. I am still trying to get the retracts working. The air line that I ordered is too small so I need to get something just a little larger. Anyone know what size airline I need for rhom Air retracts? 1.5mm id is too small. I can get 1.7mm from hk. The brass tube fittings are 2mm od.

Martyn
Chili Pants09/12/2018 21:56:39
16 forum posts
13 photos

Not sure if this helps but there are some pictures of a ROM -air manual over on RCU http://www.rcuniverse.com/forum/classic-rc-pattern-flying-379/4851044-rom-air-retracts-manual-requested.html

They do not give the air line sizes unfortunately but they do show that the air lines have a 1/8" wheel collar around them to help control the speed of operation, so that should give you an idea of the external tube size but Im not sure that helps much.

Martyn K09/12/2018 22:19:20
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4805 forum posts
3498 photos
Thanks. I do actually have the manual. As you spotted, no info on the size of the pipes. I do have a couple of short lengths of the original pipe and it is 3mm od. They plug into 2mm brass tube. The instructions say they have to be heated slightly then stretched into place. I couldn't get the 1.5mm id to stretch far enough so have ordered some 1.7mm pipe from hk along with some couplers and other bits as spares. They won't be here for another week or so though.

Edited By Martyn K on 09/12/2018 22:23:07

Martin McIntosh09/12/2018 23:35:02
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2737 forum posts
1026 photos

I`m pretty sure that the Rom-air units I used to use had very small i/d tubing. Very tight and needed soaking in hot water first. I should have some unused HK stuff. Will have a look and measure it tomorrow.

Martyn K10/12/2018 09:06:16
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4805 forum posts
3498 photos

Thanks Martin

Appreciated

Martin McIntosh10/12/2018 09:19:07
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2737 forum posts
1026 photos

I have 2x 5ft of transparent and an unopened twin pack from HK. They fit Rom units and are about 1.7mm (more likely 5/64". Remind me of your address if you want either. The transparent is best. Trying to get away from air retracts so these are surplus.

Martyn K10/12/2018 09:22:16
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4805 forum posts
3498 photos

Thanks Martin

Just emailed you. Very much appreciated

Martyn

Martyn K18/03/2019 12:20:20
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4805 forum posts
3498 photos

Embarrassed to say that its been a long time since the last update. Unfortunately, I had a heart attack just after Christmas (followed by 2 more much milder ones) so workshop time has been a bit spasmodic. However, I have made odd bits of progress but forgot to do much in the way of photos and updates. Sorry for any gaps.

I eventually got the retracts working but I needed to replace the O rings in the switch unit. That seems to have sorted that, it appears to be holding pressure now and wheels go up and down when instructed.

While all this was happening and some of it in the wrong sequence, work progressed on the wing

wing4.jpg

Holes for the retracts cut and retracts fitted using beech blocks

wing5.jpg

Cut outs for the ailerons done- as per plan

wing6.jpg

Wing tips added - laminated from balsa sheet. They are supposed to be pointed at the very trailing edge. I eventually rounded them slightly as they kept breaking.

wing7.jpg

Wings joined using GF Resin bandage and alignment checked at the wing tips. These level boxes are an absolute bargain.

wing8.jpg

With the wing joined

wing9.jpg

With the wing joined and fitted, the sheet sides that fit the belly pan can be installed

fus27.jpg

And a test fit.

wing10.jpg

Aileron servo cut outs with thin beech bearers and a bit of filler

wing11.jpg

The switch for the retract servo - mounted on the wing

fus16.jpg

The fus was painted. What could go wrong, the primed surface carefully sanded down with fine wet and dry and 2 pack white applied. It looked stunning.the cockpit masked off and painted using Tamiya paints from an airbrush. Ditto the red. However, when the mask was removed some of the paint pulled off - the white gloss base hadn't adhered properly to the primer. This was carefully repaired and masking/painting continued.

fus21.jpg

I was really quite pleased with the paintwork, even the lettering was painted. However, when masks were removed, huge chunks of white came away. Basically, I had to sand it back and redo it.

fus25.jpg

This time, the lettering was done using Vinyl.

Fitting out has taken far longer than expected

fus17.jpg

A header pipe was manufactured by Weston UK and the engine fitted and servo wired up.

This is a pumped engine - the fuel piped routed around the firewall

fus26.jpg

A bent ali bracket supports the lower cowling.

fus24.jpg

The pipe length calculated and fitted. The clamp still needs to be completed. The area in the fus is enclosed within a 3/16 balsa box. That was a real fiddle to fit. (I was being very polite there).

fus20.jpg

cooling air outlets carefully cut and a slot for the exhaust outlet

fus23.jpg

The radio gear in the fus has been fitted.

wing3.jpg

Finally - some colour added to the wing. The ailerons were fitted this morning. Horns next then elevators and rudder

Martin McIntosh18/03/2019 14:42:23
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2737 forum posts
1026 photos

Hi Martin,

Glad to hear that you are recovering.

I gave up on those Rom up/dn air valves a long time ago. Seem OK on the ground but leak when vibrated. The red anodised HK ones actually work, as do their blue filler valves.

Cannot remember what your fus. is covered with, but I always add a coat of 20% dope just before painting. This seals the dusty surface and prevents the masking from lifting the primer or paint (usually).

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