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ASK13 1/3 Scale

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Peter Balcombe
Posts: 1250
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: ASK13 1/3 Scale

Post by Peter Balcombe »

With the spruce hinge spars added to the Stabiliser, attention turns to the elevator halves.
Whilst the Stabiliser was build horizontal, using the rib building tabs to keep everything flat until the top skin has been added, the elevators & rudder are built vertical on their respective ply strips.

The elevator strips are 0.8mm ply, so these need to be held flat on the building board whilst the ribs are added (until the 1/2” x 1/8” spars are fitted). The TE is shown as a 4mm Balsa core (notched for each rib TE), sanded to profile & then capped with 0.4mm ply skins to give a 2mm thick TE.
After trying this approach on the LH elevator, I decided to try a slightly different approach on the RH one in order to give a better defined TE when profiling.
Thus although most of the RH elevator TE is comprised of a separate trim tab, the tip section TE core will be made from a strip of 0.8mm ply laminated between two 1/16” Balsa strips.
When profiled, the Balsa will be sanded back to the ply edge. The 0.8mm ply core, plus two 0.4mm caps should give a solid & straight 1.6mm thick TE.

It’s also worth noting that, in common with other CNC cut builds, the CNC parts are often a slightly different size from the printed plan - due to paper print linear errors being greater than the very much more accurate laser cutting.
This difference is more obvious on span-wise parts.
However, the answer is to use the laser cut parts as the reference, using the plan as a guide to enable some hand cut parts to be correctly resized, rather than cut from the plan.
If everything is cut from the printed plan, then there shouldn’t be an issue as everything will be out by the same percentage error.
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patte de loup
Posts: 22
Joined: 18 Mar 2015, 21:11
Location: Strasbourg ( FRANCE )
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Re: ASK13 1/3 Scale

Post by patte de loup »

Cliff Evans wrote:
23 Dec 2020, 08:00
patte de loup wrote:
23 Dec 2020, 07:35
Some other pics of this glider here:
http://www.aeroclub-alpilles.fr/galerie ... pt2013.htm
Pat'
Yes, I have those pics. Have tried to contact the club to see if they have any more including cockpit detail but alas no answer. I called the club on the phone but nobody spoke English and my French is at best crap! If you have an in there and can get some more info I would be extremely grateful.
Hi Cliff,
In my mind the best way to catch up some further info should be to contact Gerard himself (GPR). He is closed to to the club:
lesgpr#@#free.fr (take out the #).
BTW I also made a drawing for my best friend at the same scale of this beauty and this one flies very well with 12 kg of weight .
My friend has also some pics about the cockpit ( located in Strasbourg ). Please tell if you need it ;-)
Pat'

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Cliff Evans
Posts: 382
Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: ASK13 1/3 Scale

Post by Cliff Evans »

Thanks Pat.. I have emailed Gerard. Would you see if you can get the cockpit details off of your friend please.
Laser Cut sailplanes

patte de loup
Posts: 22
Joined: 18 Mar 2015, 21:11
Location: Strasbourg ( FRANCE )
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Re: ASK13 1/3 Scale

Post by patte de loup »

Following this link;
- https://forum.spmc-modelisme.fr/viewtop ... f=9&t=5177
- https://spmc-modelisme.fr/
the ASK13 building of my friend

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Peter Balcombe
Posts: 1250
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: ASK13 1/3 Scale

Post by Peter Balcombe »

The basic structure of the tail feathers is quickly completed once the spars and TE cores have been fitted.
I have also built up the fin structure on the rearmost fuselage former.

No excuse now to make a start on the larger bits - once I get a longer building board setup indoors :)
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Max Wright
Posts: 104
Joined: 10 Mar 2020, 19:57
Location: Clayton Bay South Australia

Re: ASK13 1/3 Scale

Post by Max Wright »

Looking excellent, Peter. 8-)

I'm following along.

Cheers
Max

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Peter Balcombe
Posts: 1250
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: ASK13 1/3 Scale

Post by Peter Balcombe »

Well what a day :D
Realised after looking at the fuselage plan & laser cut bits that as several fuselage formers had building tabs on them & there were also plenty of laser cut longeron parts, it was going to be possibly to build the front half of the fuselage structure on my 4ft board 👍

First off, you need to decide whether or not you are building to have a front wheel or not. Once decided, select the front formers with a ‘W’ suffix for front ‘Wheeled’ variant, else ‘S’ suffix for Standard varian without front wheel.

So, after making sure that all interlocking slots slide together ok, I started by assembling the building tabbed formers to the two forward keel pieces (starting from F2 & working back to F11). Note that you may find it easier to first remove the cross pieces between the tab extensions, otherwise you will need to start with Former 6 as otherwise it will only go over the keel pieces from the front.

Just remember to fit the 1/16” ply main wheel guard between the keel pieces before you fit the rear formers as the laser cut guard is tabbed.
Remember to fit F2 & F3 the correct way around to have the servo on the RHS.
Remember also to fit the horizontal plate between the root ribs whilst fitting the appropriate formers to avoid locking this out as it slides between a horizontal slot in one former & is tabbed into others. (I fitted the M4 wing retention bolt captive nuts into this plate before installation).

Once I had the formers in place, I could add the laser cut forward & canopy base longerons to tie everything together, followed by the 4 joiner tube guides between Formers 9 & 10, then the root ribs.

I fitted the Former 1/1A lamination last of all, noting that the 2 keel pieces will need to be curved inwards a bit to get the correct spacing for the former slots.

The pictures below show the structure without root ribs, the joiner supports & then the forward structure with all CNC bits fitted.
There are just 2 additional spruce longerons to add on each side on the forward section & these will be fitted once the rear part of the fuselage has been built on. Additional tabbed formers at the rear & internal horizontal plates will ensure that the rear section is square & straight with the front.

Well, that’s it for a couple of days whilst I negotiate extra space with local Management ;)
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Peter Balcombe
Posts: 1250
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: ASK13 1/3 Scale

Post by Peter Balcombe »

Whilst workspace negotiations were ongoing I was able to add the longerons to each side of the forward section. These 36” length were scarfed over 2” & left in place to mate with the rear sections. Note that the lower longeron runs the full 2.5m fuselage length!
The few remaining forward fuselage CNC parts (wing joiner tube slots, root ribs etc) were also added, together with the forward sections of the rear top & bottom keel strips & a couple of formers to hold these in the correct places.
A3C3646F-7177-438A-9044-652349F613F0.jpeg
8DE2808E-CF37-4997-BA36-1E3858080D42.jpeg
Once extra space was available I set up my longer building board (old draughting board, split in two & joined end to end).
Now I could add the remaining formers and rearmost keel piece, plus 0.8mm ply internal shoulder height cross plates, using a centre-line, the tabbed formers and notched cross plates to make sure everything was true.
Once all formers were in place, I could add the upper spars running from fin to cockpit opening, followed by the upper parts of the rear formers & the rear section of the top spine.
1A1E5AD5-F0BD-4260-A944-FE2BD74A6DE4.jpeg
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A nice touch from Jilles is the centre pointer on the tabbed CNC cut formers. This greatly eases alignment :)
BE5A7FF6-13ED-4BE9-B82F-E1D2F37E8A53.jpeg
The Cabriolet canopy has also been assembled in the cockpit opening to ensure a good fit when skinned.
7FA4F7BD-B720-463A-90B5-07178C33B560.jpeg
Attachments
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Max Wright
Posts: 104
Joined: 10 Mar 2020, 19:57
Location: Clayton Bay South Australia

Re: ASK13 1/3 Scale

Post by Max Wright »

This build looks like a lot of fun, Peter. 8-)
Max

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Peter Balcombe
Posts: 1250
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: ASK13 1/3 Scale

Post by Peter Balcombe »

Hi Max, yes the parts are going together very nicely indeed :)
Although there aren’t many stripwood longerons in this build, they easily gently bend to follow the fuselage lines without the need for any steaming - so very easy to build indoors at this time of year.

With the basic rear fuselage parts together, it time to add the tailplane seat before it’s locked out by the side longerons. The two hold-down assemblies (F19, 19A, 20, 20A plus P1s fitted with M4 captive nuts) can be pre-assembled & then slipped into place under the upper longerons used to support the 0.8mm BR2R top plate.
F20A also notched into the keel. Line up the hold-assemblies with the holes in the top plate & double check by bolting on the tailplane seat (STS).
(I forgot to fit a Cyano soaked balsa support block above the captive nut, so will need to do something after the event :o )
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