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Playing in the Sandbox Group Build Sept 1, 2024 - Jn 1, 2025

HPH PBY-5 Catalina


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Paul,

Using some sort of walkway to at least cover the joint itself will be your best bet I think. Trying to sort it out will do more harm than good.

With so much interior detail the eye is possibly drawn away by other items than that join.

What a project.
Cees

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Hi Cees,

 

Thank you for your reply. I'm going to have to think on this issue. As far as I'm aware the interior step wasn't staggered fore and aft on the full size aircraft. The odd thing is that on model all the other transverse structure lines up quite nicely. Before I do anything else I want to finish installing alignment spigots in the fuselage halves, then I'll at least have a consistent datum to work from.

 

Yes, this build is becoming a bit epic but I am really enjoying it.

 

Paul

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Gidday Dave,

 

Glad to be of service. There's been the odd time I've asked myself why I didn't I build a Wingnut Wings AEG or Gotha? (Yes, I do have those kits in my stash.)

 

The question is though, when are you going to join me? As that line from an old kiwi commercial went, "Come on in Dad, the water's boiling!"

 

Cheers

 

Paul

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Hi all,

 

Anthony, thanks for the encouragement. It's a great kit and well worth getting.

 

In my last post I was in the process of fitting the fuselage frames. However, it became apparent that I needed to take a step back from that and get the fuselage halves fitting correctly together first. Part of that process has involved preparing the horizontal stabilisers for mounting, which the following photos should help explain.

 

The instructions suggest reinforcing the horizontal stabiliser mounts with a suitable gauge wire. However, to do that mounting holes need to be back drilled in the fuselage mount points. Each stabiliser has mount guide holes cast in the mounting face and these need to be transferred to the fuselage mount points. I used clear acetate to mark the hole position, which was then transferred to the fuselage mounting face. The next few steps involve a few assumptions about the overall accuracy and finish of the edge of each fuselage half. (In other words finish of the fuselage join lines.) Despite needing finishing each half does seem to be flat and level. This allowed me to drill each mount hole accurately using a drill press.

 

P1010271_zps9whs07xp.jpg

 

The next stage was to temporarily mount each horizontal stabiliser so I could back drill into the stabiliser itself. (The initial cast holes were only shallow and not finished for mounting.) And to do that I had to ensure each stabiliser was mounted perpendicular to the fuselage centre line. The picture below shows a simple balsa jig I made to achieve this. 

 

P1010272_zpsfw1xn5yj.jpg

 

Here are the fuselage halves taped together and both stabilisers spot glued in place. I must complement HPH on the accuracy of their molding as each stabiliser sat nicely in place with minimal adjustment.

 

P1010273_zpscdmm9okj.jpg

 

I'd like to prepare the fuselage for joining prior to fitting the interior and I'd like some suggestions as to how I could fill the gap below without actually gluing the halves together. The rest of the joins are quite good but the spine is going to need some work. I have thought of temporarily mounting each half on a flat sheet and filling with a suitable material. (CA mixed with talcum powder, epoxy, or putty - suggestions welcome.)

 

P1010274_zpsw9oy5r2c.jpg

 

This process is a bit of a mission but I think it's much easier to get right now rather than once the interior is assembled.

 

Till next time.

 

Paul

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Hi Jeroen,

 

I have considered your suggestion. The fuselage is fibre glass so it would take quite a while. (Think acolytes of the middle ages copying religious texts.)  I think you'd need a flat glass plate and a whole lot of patience while carefully sanding each fuselage edge. From what I can see of the fit so far of the internal fuselage frames, I'm going to need as much internal space as possible to allow them to fit. I may have to experiment with fit a bit more before I decide on the best course of action.

 

It's not the building issues that I find intimidating as I quite enjoy the challenge, it's the thought of all that I need to learn and practice when it comes to painting and weathering. One step at a time...

 

Paul

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  • 1 month later...

Hi Cees,

 

Nice to hear from you. Yes and no is probably the best answer. I'm in the process of sanding the two halves of the airframe. To do this I'm using a flat surface with 200 grit sandpaper. I've blacked the edges of the fuselage and now it's a matter of sanding and checking the fit/alignment on a regular basis. One problem that has to be addressed is alignment of the rudder with the surrounding tail fairing. At the moment the tail fairing is too wide and needs to be sanded down to match the rudder profile. Imagine, if you will, sand - check - sand - check repeated ad-nausium.

 

However, this was never going to be a five minute build. Hopefully I'll have some more progress in the not too distant future.

 

Paul

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  • 5 months later...

Hi Pardelhas,

 

I'm sorry it's taken me so long to reply.

 

Unfortunately I haven't had anything new to report. I really need to get the two fuselage halves sanded and matched before I can continue fitting the interior frames and components. However, I've been wanting to get through this next stage so I just need to make some time (Sometimes easier said than done with a young family) and get into it. There's no shortage of inspiration on this site.

 

Paul

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P1010273_zpscdmm9okj.jpg

 

Aha, I knew it...i knew it. There's no way you could afford all that big stuff all by yourself. You slippin' man, you slippin'...I see who you are. Left your dirty laundry but forgot to remove the suit Mr. Wayne. Man, look at all them fake abs and all...trying cover that cag. :lol:

 

 

just kidding!

 

:D

 

Glad to see you back on the saddle again! ;)

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Hi youngtiger1,

 

Yes, you've found out my dirty little secret. I moonlight as a washing super hero, hence the lack of progress at the workbench.

 

However, I'm on annual leave at the moment (Even super heroes need a break.) and I've spent some fun times sanding the fuselage halves on a flat tile. It's almost as much fun as washing. Having said that I can't progress until the fuselage halves are matching nicely. I've taken some pictures that I'll post soon, which will hopefully show what I need to overcome.

 

Paul

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  • 1 month later...

Hi all,

 

Finally, I've had a chance to post an update. I've been trying to do just a little bit each day and I'm slowly making progress.

 

The picture below shows the result of sanding both fuselage halves on a flat plate. Although it took quite some time, the result is well worth the effort, especially when compared to the fuselage join pictures in the previous post. From my experience so far I'd make it a priority for anyone building a resin kit to ensure that all major components fit well before commencing fitting the internal components/structures.

 

Pic%20011_zpsvq5wh5zk.jpg

 

There is still a gap in the keel, which extends beyond what I could sand off without taking off fuselage material. I'm quite confident this can be filled and sanded when the time comes.

 

Pic%20008_zpsgk5t5hun.jpg

 

In addition to sanding the fuselage halves to improve the join it is also essential to thin down the tail section so that it fairs with the rudder. Initially, the tail section was too thick for the rudder. This was sanded on the flat plate and now fairs nicely with the rudder. The rudder also requires some careful work at the rudder hinge point if it is desired to have it positioned in anything but a central position. (More photos to come once I've completed that little project.)

It may not be too clear in this picture but the right hand side of the rudder fairing is slightly lower than the left. I built this up with plastic strip and sanded it carefully to match the left. As a result the fairings leave a minimal gap with the lower rudder surface.

I've also tried a trial fit of the vertical stabiliser structure. Most  of this won't be seen unless, perhaps. the rudder is positioned offset from centre.

 

Pic%20012_zpsllvecrc6.jpg

 

Another picture showing the mismatch between the halves of the tail fairings.

 

Pic%20010_zpsoz5g84x6.jpg

 

 

The next issue to overcome is internal. As can be seen, there is a mis-match between the step. I'm leaning towards correcting this as I don't know how much will be hidden once all the equipment and internal structure is installed. I'm thinking about trimming down the right hand fuselage step and re-scribing the panel lines as required. Not a small job but I want to make sure the bulk of the work is done on the airframe so that I can be certain of a good fit when it comes to joining the fuselage halves further down the track.

 

Pic%20007_zps4ihbqd1f.jpg

 

Work will continue on the fuselage by trimming all the cutouts and trial fitting the windows before moving on to test fitting the internal frames and structure. My aim is to get everything temporarily fitted before disassembly for painting. But that is some way off yet.

 

Paul 

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Very interesting how the outside step lines up but the inside one does not.  It might be easy to add a strip of styrene the thickness of the offset to the one side and then fill and rescribe the panel lines.  The small strip with the rivets on the floor can be easily recreated as well once the filler piece is place.  Looking forward to your progress.

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Thanks for the reply nichenson,

 

I was inclined to cut the fuselage back to match the steps but I like your idea much better, which has a lot less potential for major damage. I've got some days off coming up and am planning to spend some time in the workshop.

 

Paul

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  • 2 weeks later...

Hi all,

 

Progress continues to be made, albeit slowly. As said previously my priority has been to ensure the fit of the fuselage halves and the external/internal structure.

 

Continuing externally I've trimmed the pylon and sanded the wing/pylon plug to fit nicely. This wasn't difficult, though I did run tape along the point I wanted to sand to on the pylon so as not to remove too much material.

 

P1020623_zpsf1emb8e9.jpg

 

And with the wing sitting in place. (As a break from working on the fuselage I'm tempted to work on the wings just to see how they look on the fuselage when fully assembled.)

 

P1020624_zps9bjz7sbj.jpg

 

My aim is to get all the structure/equipment test fitted before moving on to the internal structure, especially the fuselage frames and nose wheel well. However, the next challenge is very much along the lines of fitting a square peg in a round hole as shown below.

 

P1020625_zpstfu0jyer.jpg

 

I'm in the process of fitting the nose turret, which is not wanting to co-operate. The turret itself is OK but the structure surrounding the turret is too wide at the base. You'll possibly notice too, that in an effort to aid fitment, I've inserted plastic strip between the fuselage halves fore and aft of the turret. This has also been done with HPH's model and is clearly visible in the instructions. Doing this has helped somewhat but the surrounding turret structure is still too big at the base. I'm going to examine some actual pictures of the area but I suspect that I'll be doing some scratch building to get everything fitting nicely.

 

Once I'm satisfied with the turret my aim is to refine all the window cutouts and temporarily fit the windows, including the gunner's blisters, which could provide some challenges.

 

Paul

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  • 2 weeks later...

Impressive work sofar Paul,

Yesterday I had the privilege to fly in the Dutch Catalina PH-PBY. It was a magnificent experience. You really have the

feeling you are in a boat with wings. The view from the side blisters is breathtaking.

Keep the updates coming please.

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Impressive work sofar Paul,

Yesterday I had the privilege to fly in the Dutch Catalina PH-PBY. It was a magnificent experience. You really have the

feeling you are in a boat with wings. The view from the side blisters is breathtaking.

Keep the updates coming please.

 

Maybe you can share some of the pics you took inside the fuselage!

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Here's a small selection, it is not representative of a wartime aircraft as it is fitted with 16 passenger seats, but

you sure get the idea you are in a very old aircraft, and the noise is deafening.

 

20160814_144344_zpsosbigfo9.jpg

 

20160814_151416_zpst2dfzq91.jpg

 

20160814_145623_zpss1lheybg.jpg

 

20160814_150149_zpspoifdusv.jpg

 

20160814_141946_zpsuma76g5v.jpg

 

20160814_141809_zps7fbmpo0f.jpg

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Hi Cees,

 

Thanks for the encouragement - it's not a quick project and I really want to make sure there are no fit issues before I start glueing and painting.

 

Love your photos of the Cat flight. I flew a Tiger Moth last year while on holiday in the UK. It was a little different from what I normally fly and I enjoyed every minute of it.

 

All the best

 

Paul

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  • 5 months later...

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