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Member postings for Harry Twist

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

Thread: Chris McG F-86 Sabre Dog build blog
06/12/2019 11:39:24

Hi Chris, just to back up some of the other comments, keep on posting! It's great to follow these Sabre build blogs.

Thread: F-86A Sabre Montana Air National Guard
02/12/2019 19:36:26

Thanks Phil, hope you get your Sabre on the go soon.

General question to Sabre builders out there, has anyone tried any fuselage sheeting or part sheeting? or is everyone planking all round? I think there may be some part sheeting opportunities in a couple of places such as the rear underside or forward of the canopy. I'm not there yet but may look at it. Any comments appreciated!

Thread: Sabre build "Gotchas"
30/11/2019 19:15:33

Hi Martin, this is a very minor one, not really a "gotcha" but thought it may be worth adding.

The parts come with an occasional minor triangular shaped "pip" on their edges (presumably where they are released from the parent sheet). It's no problem at all to sand them off prior to use. A surface that perhaps may get missed from this sanding is the inside square section of F2 and F4 where the battery box sits on the internal flat portions of those formers. Easy job to do before the fus is jointed. Its no great shakes if it gets missed - just helps with a flush/ tight joint between battery box and formers.

Edited By Harry Twist on 30/11/2019 19:16:10

Thread: F-86A Sabre Montana Air National Guard
30/11/2019 19:03:14

Hi Chris & Mark, thanks for your comments.

Ref the planking - I added 10 planks on the first half before adding the second half in sections. Each plank is 7mm wide, they were all butted together, but distributed above and below the fuselage centreline. ( I started on the centreline and worked down by 5 planks, then back to the centreline and worked up 5 planks).

I reckoned that the combination of planking and stringers, plus adding the top spine (which doubles the spine thickness) would minimise any warp risk. I think its further helped by adding the substructures of the second half, one by one, allowing drying in between. Anyway - I don't think its warped yet!

I'll carefully plank the non planked side, then do alternate side planking until I'm done.

Edited By Harry Twist on 30/11/2019 19:17:43

29/11/2019 23:22:00

Hi All, I've moved the fuselage on a little more. I have been worried about the major "glue up" required to join two part planked fuselage halves in one go. This involves, applying glue along all the major joint lines of the top and bottom spines, and along all the former joint lines, gluing and fitting the wing bolt plate, then aligning and clamping, all  in one gluing "event". I did'nt trust myself to get this all square and had visions of glue everywhere and an out of line fuselage!

So I tried an alternative. I part finished one fuselage half to the point of adding 10 planks (7mm wide). I then built the second half, section by section, onto the part planked first half. I starting by adding the straight top keel, then worked front to back, adding each sub structure in turn and allowing drying between each stage. At the end I added the stringers and the small part bulkheads of F3 and F5.

Photos hopefully show all!

Nose and battery box added, after top keel

img_20191126_200506433_hdr.jpg

Central crutch and wing bolt plate, I adjusted the plate to move it back approx 5mm to sit against F7

img_20191127_114225654_hdr.jpg

 

Tail unit, clamps and more clamps

img_20191127_232103343_hdr.jpg

 

Last addition- lower curved spine

img_20191128_182251603_hdr.jpg

 

End product

img_20191129_185622427_hdr.jpg

Edited By Harry Twist on 29/11/2019 23:23:23

Thread: Chris McG F-86 Sabre Dog build blog
29/11/2019 22:51:05

Hi Chris, Great progress with the wing there. Regarding the waffles... you've not just chopped up your wing jig and grilled it have you? smiley

Edited By Harry Twist on 29/11/2019 22:51:27

Thread: Andy Edmead Build Blog Sabre
27/11/2019 10:16:57

Good tips there Chris, here's another that may help for trimming false leading edges (and false trailing edges).

Take a steel ruler and sit it immediately behind the false le and sat on top of the ribs, with a scalpel cut through the part of the false le that sits above the ruler, then cut along the ruler with the blade flush and flat on the ruler surface. This leaves you with only the thickness of the ruler to plane down flush. Cut from in front of the wing. Staged photo shows what I mean ( wing in photo already trimmed).

Hope it is of some help!

 

img_20191124_233020641_hdr.jpg

Edited By Harry Twist on 27/11/2019 10:23:48

Thread: Canadair F4 Sabre XB812
27/11/2019 00:15:41

Looks like an absolutely 100% perfect launch to me....😁... The wind gods were very much on our side that day!

Edited By Harry Twist on 27/11/2019 00:17:04

Thread: DaveO Sabre build
24/11/2019 23:24:44

Hi David, looking very tidy.

Thread: Canadair F4 Sabre XB812
23/11/2019 23:45:45

Hi Chris, that's very very tidy, nicely done!

Thread: F-86A Sabre Montana Air National Guard
23/11/2019 23:36:43

Hi All, I've moved the fuselage on a little, well one half of it anyway!

I cut the spines from sheet and decided to cut them slightly oversize at 8mm x 3mm. This was to ensure that the very top of the formers sat on the spine and not slightly below it. I used the straight top spine as the starting point, pinning it to the plan and ensuring all the touching formers sat in location and square. I then pinned, clamped, glued and weighted the combined nose unit / central crutch / top spine and the tail unit. Once dry I added the curving bottom keel as one piece, curved and pinned. Again, once all dry I added the F3 F5 formers and the longitudinal stringers. So for me, the fuselage framework ended up as a three stage assembly process.

I did have an issue with the lower stringer, which at full length along the curve just about sat on F1 and F10, but not enough for me to be happy that it was secure front and back, so I scarf jointed a piece in, with the joint sat on the double former F4/F4a. The other two stringers were fine.

Now onto the planking, prior to planking I sanded gently to ensure all the stringers sat flush with the formers. I've cut my planks 7mm wide, parallel full length and have so far added 4 planks. I'm taking my time over this - trying to align the planks carefully and trying to visualise how it will look.

It's great to see and read all the ideas, guidance and sharing of information that's going on in the Sabre build blogs.

Happy building!

 

Bare framework completed - one half only

img_20191121_111536000_hdr.jpg

 

Short scarf joint at F4/F4A- the dark lines at the former /keel joints are not gaps they're blue pen ink lines delineating the locating/gluing boundary!

img_20191121_112109190_hdr.jpg

Long view - curving keel, one piece of 8mm x 3mm.

img_20191121_112124910_hdr.jpg

 

First planks - plank width here is 7mm, planks parallel nose to tail.

img_20191123_221034752_hdr.jpg

 

 

Edited By Harry Twist on 23/11/2019 23:43:32

Thread: Andy Edmead Build Blog Sabre
23/11/2019 22:31:18

Hi Andy, nice tidy work there, looking good already!

Thread: F-86A Sabre Montana Air National Guard
19/11/2019 23:29:35

Hi Steve, one servo - sat at the centre, it will only make one movement per flight, pulling two lightweight piano wires around 5mm (one wire per wing). Not decided on the servo yet, but it will be a light one! Pushrod geometry, nothing complex hopefully, 90 degree bends taking the pushrod up to the servo. Each pushrod end then located into opposite ends of a servo arm. There's more detail in the John H A4 build - thanks Martin for the link.

Edited By Harry Twist on 19/11/2019 23:34:24

18/11/2019 20:54:58

So, taking a breather from the wings, it was time to make a start on the fuselage. First job was to tickle all the surfaces with fine sandpaper removing any loose particles and hopefully create a slight key for surface jointing. I then laid out each piece with its partner and checked for symmetry ( I also went a little over the top and labelled, in pen, all the left pieces with a discrete little "x" and all the right with a little "y". In addition I measured the longitudinal parts for equal length for left and right sides (F14 and f15). All was good here.

I then dry fitted all the parts I could, a little work was needed here and there to ensure a good fit on some slots but no great issues were found. Subsequently I have started to assemble of some of the "sub structures" ( the central overwing block of three formers and F14, plus the tail block of F9, F15, and F10, they're all basically 90 degree joints.

Once all the sub assemblies are complete, I'll locate all on the plan, add the keels and do a full fit before gluing.

Some progress shots below.

 

Parts laid out - I subsequently turned the upper fuselage plan around 180 degrees to be the right way up, so now building both halves the right way up ( I could'nt cope with upside down and reversed, I was bound to make a mistake!).

img_20191031_131643021.jpg

 

Sub assembly 90 deg jointing, left side shows central crutch, F7 previously jointed at top, F4 under weights, F6 not yet glued in position. Right side shows rear sub assemblies F9 previously jointed, F15, F10 under weights.

Clearly they're not sat in situ on the plan (!) since they're 90 degree joints I chose to sit the former flat on the build board  and build upwards ensuring 90 degree joint with the longitudinal formers F14 and F15) and adding weights to the laid flat former. Then once dry turn the whole thing over ( like an egg timer) to glue the opposite former. They will be located  on the plan later.

img_20191117_163912902_hdr.jpg

Nose area - a sub assembly in itself

img_20191118_181305120_hdr.jpg

 

 

Edited By Harry Twist on 18/11/2019 21:22:58

18/11/2019 19:55:00

Hi All, I have been slowly inching the Sabre along a bit more.

After a bit of thinking and head scratching I've decided that the drop tanks are so much a feature of the Sabre that I wanted to try to incorporate them into the build. Since they would be damaged easily on landing I'm planning for them to be jettisonable. So using a 1:72 Airfix model I have tried to scale up the location on the wing and the size of the tank and pylon to suit a 1:10 model. Disclaimer(!) - these are my kitchen table/ pen and pencil numbers and may not be 100% scale accurate! I reckon the tank pylon sits midway between R8 and R9, or 30cm from the centreline. The tank itself is approx 34.5cm long and 6.5cm in diameter at its widest. (its basically a torpedo shape with fins and a flattened top, although there is more than one tank type!).

So leaving the tank detail and construction until later, I have added the first part of a delivery system to the wings (basically I have copied John Heys proven method from the PSSA A4 mass build - thanks John!). Its a central servo driving a piano wire pushrod to the chosen location, the end of the rod push/ pulls through a hole in the pylon/keel of the tank. It did take some time to set it up - and you need to put holes through all those lovely ribs, it has also meant chopping away a portion of the front of the two R1 ribs to accomodate a servo location.

The wings were then planed and sanded to approaching a near finish state, although the top skins have not yet been added. I have now set them aside temporarily and moved onto the fuselage.

Drop tank location and size - ( ignore right hand location/ image of tank- I had a plan and elevation view on the same piece of paper and simply laid it below the wing, left hand tank drawing is "in location" between R8 and R9).

img_20191112_162620722_hdr.jpg

Tank delivery system- straw for support, plastic tubing either end, slightly larger internal diameter than piano wire diameter- sliding fit.

img_20191117_175503095_hdr.jpg

Thread: Chris McG F-86 Sabre Dog build blog
18/11/2019 19:15:09

Hi Chris, thanks for sharing the Red Devils story. The Hawker Hunter always looks good in red!

 

Edited By Harry Twist on 18/11/2019 19:15:51

Thread: F86 "Gamma" Build
17/11/2019 16:07:14

Hi Martin, thanks for your reply. I'll use F10 as it is, also thanks for the lower keel detail. Regards H

17/11/2019 11:50:40

Hi Martin, just preparing my fuselage pieces, please can I ask, ref F10, should the upper slot be deepened to 6mm to accommodate the spine or does the spine sit high here? Also ref lower spine, is it recommended to scarf joint two pieces from sheet or curve one piece? Thanks in advance!

img_20191117_113818282_hdr.jpg

15/11/2019 23:33:39

Hi Martin, thankyou for all the recent posts they're very very helpful. My build currently slightly stalled, I'm full of an awful cold!

Thread: Sabre Aerobatic Teams
14/11/2019 09:49:49

Hi Mark, great montage! My version is not from an aerobatic team, but I'm sure the pilot could fly in close formation!

montana ang f-86.jpg

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