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Member postings for Martin McIntosh

Here is a list of all the postings Martin McIntosh has made in our forums. Click on a thread name to jump to the thread.

Thread: Martin's Tucano
17/12/2012 22:54:56

The wing fairings are added. Balsa block required at the rear to finish.

The ply is 1/64 and the balsa 1/16. Trim off as required. See general build thread for more details of this.

Thread: 2013 Mass Build - general chat thread
17/12/2012 22:46:22

Phill and Geoff,

As we speak I am starting to add the fairings. Mine being a built up wing is rather different but the idea is the same.

I cut 1/64 ply to the outline, taped it to the wing then glued it to the fus.

1/16 balsa was glued on with sellotape on the wing to prevent adhesion to this.

This is as far as I got. The balsa needs trimming then the rear end filling with block.

17/12/2012 21:39:44

Why mess with the awkward triangular pieces? You will not save a viable ammount of weight over just using a balsa block top ( see my build thread- Martins Tucano).

I can sympathise with you about the quality of the pack. These used to be spot on but since trying the Nihuis 1/6 Spit. one I shall never buy another. The so called `ply` was just splintery rubbish from old tea chests.

Thread: Martin's Tucano
16/12/2012 22:32:11

Back to the build which has now come a long way. I shall not bore you with the fus. as it is much the same as any other Tucano except for the bits to follow.

The motor and noseleg mount nearly finished.

The nose from the rear. Sides are 1/8 balsa with 1/8 doublers and 1/4x3/16 longerons.

I did not bother with the triangular bits, just two 3/8 balsa sheets for the top since they are so small.

The cowl is to be from a fibreglass mold. This is the start of the balsa plug.

I used very light 1/4 balsa for the tail feathers which can be seen here trial assembled.

The servos and carbon pushrods trial fitted.

Still lots to do !

04/12/2012 22:18:29

We can now fit the wing mounts.

Remove a section of the rear skin and replace with 1/16 ply. Cut a slot for a 3mm lightply plate in the centre of the LE but do not glue until the fus is made.

Fit a piece of light glass cloth or similar top and bottom with acrylic resin or whatever and you are ready to sand and cover. Go over with 320 grit prduction paper (the grey stuff) then with a thin flexible sanding pad (B&Q).

I have not started the rest yet but it should not take too long.

If any of the above is not clear then just ask.

04/12/2012 21:58:06

Retrospectively I would make the ailerons from sheet so the built up bits can be removed now.

Add the aileron mounts and cut holes in the ribs for the wiring, adding pull threads to get this in later.

Add the lower braces and skin as for the top. Cut the LE from 3/8 soft balsa, glue on with aliphatic resin and plane/sand when set. Add the aileron and tip blanks made up from sheet balsa and shape the whole lot. Cut the ailerons from the wing and bevel the lower edge to give the required movement.

Remove material to accept the u/c and servos.

04/12/2012 21:38:55

Add rib 1 at half the angle of the braces so that it will be vertical. Cut the skin well oversize, mix Copydex with about 5% water and coat the inside of this and all parts of the top of the wing half. Leave to dry (overnight is OK). Place on the bench and carefully press on and roll over the wing to this Trim off the excess.tucano 031.jpg

Glue the other wing half to this.

tucano 044.jpg

Add the wing TE and aileron LE cut from 3/16 balsa.

tucano 042.jpg

Butt join some 1/16 balsa slightly over length. Wet one side and tape round a suitable tube to suit the wheel diameter. Sellotape around the tube first. This should be of such a size as to leave about 6mm gap around the wheel. When dry, cut the balsa and glue to form a tube. Add a disc of 2mm Depron or 1/16 balsa to the top edge (inside).

Fit the 3/8x14 spruce u/c bearers, and cut through the ribs and spar to suit your u/c leg to take the tube and glue in place. Trim flush. Add the servo rails.

04/12/2012 21:05:16

Great! Just spent the last hour or so finishing the wing build blog and it all suddenly disappeared, so will do it again bit by bit.

03/12/2012 22:48:32

Continued later. Any problems you see with the above please let me know.

03/12/2012 22:44:55

The wing is built up traditionally with four 1/4x3/16 balsa spars, a 1/8 false LE and a 3/8 sheet true LE, skinned with 1/16 balsa. The section is RAF 30 modified to 15.4% thickness of the chord using Profili s/w. It is in `my photos`but not quite to the correct size which is :root 240mm, tip 140mm. the tip rib is moved forward on the plan by 15mm at the TE. The 11 ribs are spaced at 55mm. Will try to get them on this blog in the right dimensions but there seems to be a problem with the file format.

This is the first wng halfe with the bits fitted.

The first job is to draw the new outline on to the original plan with the spars as shown.

Note that ribs 4&5 hav lightply glued to their outer edges to take theu/c.

After pinning down the front upper spar and adding the ribs (except rib 1), add the upper spar.

Add the rear upper spar.

Cut some very light 1/8 sheet oversize and add the false LE.

Cut four dihedral braces just larger than the spars to the angle shown on the plan and glue the upper ones to the first wing half, up to rib 3.

We can now make and fit the upper skin to this. note from yhe above pic that the 1/16 sheet will be far from straight so carefully cut one edge using a ruler.

Pin to the board using a ruler. Cut one side only of the next sheet then glue together with thin cyano.

Repeat for the next sheet.

Sand both sides with one of these using 80 gri

Thread: 2013 Mass Build - general chat thread
02/12/2012 23:02:57

Sorry, I meant beech, like the old engine mounts! Lite ply with a topping of thin birch ply is fine.

Thread: Martin's Tucano
02/12/2012 22:37:40

Thanks WF, just hope that I can get everything on here OK. Text has already gone a bit haywire.

02/12/2012 22:17:31

OK, I got talked into attempting this blog. I am doing a built up wing version with electric retracts.

I realise from the posts on this subject that many of you are trying a scratch build for the first time, let alone one with retractable gear, so I will endeaver to provide as much information as possible including many photos of each stage.

I only started this last week but have a nearly completed wing.

Couple of pics:

tucano 048.jpg

To be continued.

Thread: 2013 Mass Build - general chat thread
02/12/2012 21:30:56

Totally, ailerons and all.

02/12/2012 21:14:37

tucano 048.jpg

Just as a taster, here is the nearly completed wing. Weight 8 1/2oz as it is if this is of any use as a comparison with the original.

02/12/2012 18:30:56

Last week I spent about £40 on the wood from Al`s Hobbies for my built up version.

This was roughly

1/16 x3x10

3/16x1/4x10

1/8x3x6

1/4x3x1

3/8x3x3

4x3mm carbon tube x1 (pushrods)

The ply and other offcuts I already have lots of.

Don`t go buying obeche bearers-they are heavy and expensive and a bit old fashioned. Just use 3mm light ply topped with 1/32 or 1/16 birch ply.

Also buying 2" wide balsa is a false economy. Simply use wider stuff butt jointed then split to what you want-at least it will be straight.

The retract version build blog I promised will be running soon, after a problematic start.

The wing is now nearly complete.

Thread: Pics and text
01/12/2012 17:01:47

Ah, I seem to know where I was going wrong. I was clicking just under the pic not to the right of it. Doh!

Thanks again.

01/12/2012 15:06:15

Nope, that does not work. 1st text ends up at the side of the pic when I try to insert another and has to be deleted then retyped. After three pics, left clicking just takes me to the top of the page. Clicking and returning on bottom right of pic deletes it.

01/12/2012 14:44:33

Thanks guys, I shall start the write-up all over again and try that.

30/11/2012 23:07:08

I am trying to start a build blog but after adding the first pic I cannot add further text. What am I doing wrong?

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