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Canberra by Andy Blackburn PSS

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Peter Garsden13/03/2018 18:12:30
1208 forum posts
797 photos


As I said above, I made pin holes in the bottom sheet then joined up the dots with a line. The question is how to cut out the aileron, because one has to go through ribs cross grain. I used this very useful Tamiya balsa saw, which is very handy for all sorts of applications.

The link is here

Peter Garsden15/03/2018 08:30:48
1208 forum posts
797 photos

Last night I stuck on the wing tips (incidentally you need a right and a left wing tip as it is a 1/8 balsa 1/32 ply 1/2 balsa sandwich starting from the bottom, so don't make 2 right had version like what I did and have to almost start again), and the 1/64 ply root facings with epoxy.

With hindsight I should have used Aliphatic Resin for the wing root which grabs a lot better. Even using 20 minute epoxy it was starting to go off by the time I glued on the final wing root facing.


In the above picture you can see the 1/16 ply insert to hold the bolts for the Aileron horn, which is good and solid


Peter Garsden17/03/2018 19:37:38
1208 forum posts
797 photos

And so to the nacelles. It took me a while to figure how out how it all went together as there are many parts very cleverly designed with tabs, the CNC cutting very accurate. Andy - note to self - mark the plan with the part numbers shown. I think it would be easy to do. There is, however a sequence of drawings showing which order parts go together with details of the curving of the outer sheeting. There is a keel running top and bottom of the wing with formers at right angles number N1 to N10.

I decided to support the wing on blocks of foam as the keel underneath, otherwise applying pressure might crush the delicate structure

I decided to try alihphatic glue which is a wicking alternative to cyano. Less fumes but one has to pin it in position as it doesn't grab and set fast like cyano. It does,however, dry in about 15 minutes. Warning, however, it doesn't sand at all.


Peter Garsden17/03/2018 22:53:50
1208 forum posts
797 photos


Devon Slopes18/03/2018 19:10:58
12 forum posts
14 photos

Please keep posting the detailed pictures, Peter, I know I'm going to need them when I move on from building the fuselage to doing the wings.

Peter Garsden19/03/2018 08:22:25
1208 forum posts
797 photos

Well yesterday, I had an inert dispirited day trying to make the 3/32" curved 3D covers for the Nacelles. I made 2 paper patterns for one quadrant, and 2 attempts at a balsa shroud, neither of which worked. Andy I think I need some help here.

In the previous thread I said aliphatic glue - don't mean that I meant Super Phatic, sorry.

I read the instructions copiously, cut out a large sheet of paper to form my paper pattern, and laid it over the structure. I think the problem is that paper is too flexible. At the front, the sheet has to twist slightly to get over the front curve of the wing and down the side of the nacelle.

I marked top and bottom of the pattern on the paper and cut it out. I transferred it to balsa and it wouldn't fit. I tried again, and made another Horlicks of it. I gave up and watched the TV instead, disgruntled, and that was after cleaning the house as the trouble n strife is away, so I must be desperate!

My plan going forward is:-

  1. Use a cardboard template instead of paper.
  2. Use the wing root 1/16 ply rib I have made to mark off the top profile of the wing section and transfer that to cardboard
  3. Andy, you talked about cutting "darts" in the template, but I didn't understand what you meant. Can't remember if that is in the article from RCM&E or the building blog.
  4. I didn't even get onto the hot water soak, and rounding off with thumb nails at all.

This is probably the most difficult piece of building I have done so far - never shy away from a challenge though!

Andy Blackburn19/03/2018 10:49:57
407 forum posts
482 photos
1 articles

> Andy I think I need some help here.

Sorry to hear that you've been having some issues with the nacelles - it is reasonably straightforward once you know the correct technique, which I've detailed in a separate thread:


This shows the step-by-step process, and it doesn't take long to get a reasonable pattern. Let me know if it works for you or not and I'll amend the thread as appropriate.

Peter Garsden19/03/2018 13:18:57
1208 forum posts
797 photos

That's excellent Andy, thanks very much indeed, heartily and genuinely appreciated. Will save me from tearing what little hair I have, out.

Peter Garsden20/03/2018 20:42:39
1208 forum posts
797 photos

Just goes to show that a bit of good instruction and tips goes a long way. Last night I followed Andy's guidance, and heh presto it worked. What I wasn't doing is marking the outline several times and sticking the pattern to the wing. Still wasn't easy, but much easier.

I found the soaking of the wood with hot water really effective. I used cryano as suggested which didn't mind wet wood. Now I have to steam and bend a piece of 3/16 balsa which will be a challenge


Trevor20/03/2018 22:24:29
225 forum posts
17 photos

Looking good Peter! If the 3/16 fights back, you can always use two laminations of 3/32”.


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