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1/4 Scale ASK21**

Let us all watch your new project progress.
GeeW
Posts: 60
Joined: 18 Mar 2015, 22:49
Location: Bracknell

Re: 1/4 Scale ASK21

Post by GeeW »

I was just about to ask..will send over later this evening as I am on cooking duties this evening.

Gordon
GeeW
Posts: 60
Joined: 18 Mar 2015, 22:49
Location: Bracknell

Re: 1/4 Scale ASK21

Post by GeeW »

Emails sent. I hope they are useful?
Just as a nod to anyone else following this thread I have ready access at the moment to several types of glider.

ASK-21 (both early and late types)
ASW-19b
Standard Cirrus (choice of 2)
DG-1000T
LS-4b
LS-4 (surprisingly different from the 4b, different fuselage fin and altogether) (choice of 2)
LS8-18 (or 15 or 15 with winglets)
Grob Twin II
Grob Astir CS
Glasflugel Libelle H201b
Shempp Hirth Nimbus 2 (choice of 2)
Slingsby Kestrel 20 (A 19 with stretched wings rather than the later MkII which is a different aeroplane)
Grob 109b
LAK 12
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

Lovely, many thanks Gordon :)
Peter
GeeW
Posts: 60
Joined: 18 Mar 2015, 22:49
Location: Bracknell

Re: 1/4 Scale ASK21

Post by GeeW »

Two more emails should be awaiting your pleasure in your inbox. :D

Regards

Gordon
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

Many thanks for all the pics and recent dimensions Gordon.
I now have a good scaled 3 view drawing of the wheel fairing, so will break out the foam or balsa shortly to make a more realistic 1/4 scale fairing.
Peter
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

C8ED2AED-1897-4EFE-AF7E-2A819DC3E481.jpeg
60D97284-543A-4E9B-BEAA-647B85D67ADE.jpeg
Old main wheel fairing removed and underside of fuselage made good.
New fairing made and just glued in place (scaled from full size photos & dimensions kindly provided by Gordon).
Hopefully this looks more like a real fairing now (not that you probably see this view of a full size glider that often!!)
Fairing still needs to be faired in.
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

CB5A47B8-DF3B-45B6-BE70-CFA29B4C8EB3.jpeg
53B56254-8AB4-4CC3-9CAE-B12A5B0697EC.jpeg
Main wheel fairing blended into the fuselage a bit better now.
A final check to fill the last few blemishes, then on with the pattern coat I think.
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

7B97B0B5-30FA-4E24-AF90-9F4B57397C02.jpeg
After a couple of coats of pattern coat primer, initial sanding with 120 grit, then working through the wet & dry grades (used wet) to 800 grit, followed by a polishing paste, I think I have a fuselage plug about ready for the mould making process.
A photo below shows the fuselage complete with its 2 small canopy aperture blanks which will be hot glued in position after a few more coats of wax polish, then the joints sealed with wax.

Next job is to prepare the parting board.
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

Mould box
Mould box
Plug in position
Plug in position
With whole plug prepared with 6 coats of beeswax, it’s time to prepare for making the 2 part mould.
After measuring the fuselage width and getting some 3mm parting board material, I made up a box (screwed only, so easier to dismantle once 1st side of mould made) which allowed the split line to be on the upper parting board level when the fuselage is sat with one wing root on the bottom of the box. The fin is also supported to be at the correct height.
Previously positioned marks on nose, rudder post and top of fin show the splitting line.
Once the fuselage outline is cut out of the parting board (and edges also supported at correct height), the fuselage can be sat into place, the gap filled with wax (carefully cut back to give a flat surface into fuselage) prior to adding mould registration features.
The photos below show the mould box before & after fuselage plug is sat in place.
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Peter Balcombe
Posts: 1399
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 1/4 Scale ASK21

Post by Peter Balcombe »

B3AF43F9-4277-4BB5-9CFB-5B8E51447D11.jpeg
First side of mould now laid up.
A bit of a learning curve, but hopefully it will come out ok in due course.
Need to get more resin for 2nd side as it used a lot more than I expected ;)
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