1/32 Wirraway (conversion from Kitty Hawk Texan)

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1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby derekbu » Fri Sep 14, 2018 5:58 pm

Here are a few brief details of my latest work in progress.

I'm (very slowly) converting a 1/32 Kitty Hawk Texan kit into a Mk.I Wirraway.

You can follow in more detail over at Large Scale Planes if you're interested.

The kit frame is not very accurate, so I've made a new internal frame to replace the kit version. Here is one side of the frame in its jig:
Image

Here are both sides of the main fuselage frame (I realised that I missed a tube near the front on each of these, it was added after this photo was taken):
Image[/url]

Here is the starboard side frame almost in its final position, along with the new cockpit floor I needed to add, since the floor in the kit is totally wrong...
Image

The Texan is powered by a direct-drive Pratt & Whitney Wasp R-1340 engine, whereas the Wirraway is powered by a geared version of the engine, so I need to fabricate a reduction-drive housing to go on the front of the engine. Here's my CAD model of the Wasp reduction gear housing:
Image

3D printed reduction housings (one unpainted and one painted) and the crank-case from the Vector resin Wasp kit. The non-geared front housing will be removed from the resin crank-case and replaced with the 3D printed geared version:
Image

The Wirraway has a 3-bladed prop, so I need to make that from scratch (even the blades in the Kitty Hawk kit are highly inaccurate, so I can't use them). Here's my CAD model of the Hamilton Standard 3D40 propeller hub, ready for 3D printing:
Image
Last edited by derekbu on Tue Oct 02, 2018 6:29 am, edited 3 times in total.
Regards,
Derek

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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby derekbu » Tue Sep 18, 2018 7:48 pm

Another brief update.

Pratt & Whitney R-1340 Wasp "production line", with 3D printed gear reduction housings at the front.
Image

Hamilton Standard propeller "production line", with 3D printed 3D40 hubs and resin blades:
Image
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Derek

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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby Calum » Tue Sep 18, 2018 9:31 pm

Interesting project. Some nice work there
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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby bell209 » Tue Sep 18, 2018 10:29 pm

Looking good, Derek. Need to get me one of those new-fangled 3D printer thingys!
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1/48 Revell Tornado GR4 (from the IDS boxing)
1/48 Tamiya Lancaster B.III (Special)
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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby derekbu » Wed Sep 19, 2018 7:58 am

bell209 wrote:Need to get me one of those new-fangled 3D printer thingys!


Actually Rob, the 3D printed parts shown above were printed by Shapeways. I designed the parts in 3D CAD, then uploaded the STL files to the Shapeways website. They printed the parts (in the US) and mailed them to me. So if you know CAD, you can get into this without your own 3D printer.

Having said that, I do also have a low-cost ($400) Tevo Tarantula which I built from a kit. I use that for simple parts which don't need the resolution of the parts from Shapeways.
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Derek

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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby AndrewDoppel » Wed Sep 19, 2018 9:19 am

Well we both know someone who would've loved to have seen this come to fruition. I know it's early buy any ideas on what scheme you're going to finish it in.
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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby derekbu » Wed Sep 19, 2018 11:57 am

Hi Andrew, you're right - Geoff would have got a kick out of this. For this build it will be a Mk.I, representing A20-10 in its late-1939 overall silver scheme as it first arrived at 22Sqn. This is the scheme which A20-10 currently wears at Moorabbin.
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Derek

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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby DesTROYer » Wed Sep 19, 2018 12:36 pm

Outstanding.
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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby Brenden S » Tue Sep 25, 2018 1:56 pm

Silly question, but why don't you build the whole engine as a CAD file and get it printed in one go?
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Re: 1/32 Wirraway (conversion from Kitty Hawk Texan)

Postby derekbu » Tue Sep 25, 2018 10:33 pm

Hi Brenden, you could print the entire engine in one go as you suggest, but the resolution of the 3D printing from Shapeways would not be adequate for the cooling fins on the cylinder heads. It's fine for the reduction drive housing. The Vector resin engines are incredibly detailed, so I'm using those.
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Derek

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