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Author Topic: Douglas World Cruiser  (Read 9307 times)
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Tim Horne
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« on: January 05, 2018, 03:07:05 PM »

Hi everyone,

This is my latest model for the Open rubber scale class. I would like to finish it in time for this years (2018) Indoor Scale Nationals although that may be a tall order given my usual building speed.

The main reason is that a replica World Cruiser has been built and the plan is to set off on a reconstruction round the world flight starting on April 6th 2018. It would be nice if I could be flying my model while the full size replica is flying its replica flight!

You can read about the replica and the story of the original round the world flight here: https://www.seattleworldcruiser.org/

The original DWC had a span of 50', so I am building a 1/20th model at a nice 30" span.

Tim
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Pete Fardell
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« Reply #1 on: January 05, 2018, 04:07:03 PM »

Really looking forward to this, Tim. It'll be quite a model! Looking forward to seeing some progress pics soon.
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danmellor
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« Reply #2 on: January 05, 2018, 04:45:21 PM »

Nice choice!!

Dan.
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Tim Horne
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« Reply #3 on: January 05, 2018, 04:53:52 PM »

Thanks Pete and Dan, I do have pictures!

I started this model after the trip to Nijmegen last November so I am a little way along. I have wanted to try a "Dave Rees style" wing for quite a while without knowing what to use it on. The article by Mike Stuart helped with the technique and when I came across the DWC I had an ideal subject.

I'm not going to do a detailed breakdown of the method as you can read it all on Mike's excellent site. http://www.ffscale.co.uk/rees.htm

The pics are self explanatory. I decided after a lot of pondering to do a scale wing structure. This is mostly because in photos of the full size aircraft the ribs and riblets showing through the fabric are quite a feature of the look of the plane. I also decided to do working ailerons as they are only on the top wing so no linking rods or things like that to do.

Attached files Thumbnail(s):
Re: Douglas World Cruiser
Re: Douglas World Cruiser
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danmellor
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« Reply #4 on: January 05, 2018, 05:26:00 PM »

Lovely stuff Tim! I thought about doing the Rees style wing on the current Farman, but I chickened out due to the massive chord. Thanks to the nice Balsa Cabin wood, the completed 266.5 square inch wing weighs just over 9g before covering.

Dan.
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Tim Horne
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« Reply #5 on: January 05, 2018, 06:29:28 PM »

That will be a real floater Dan! I have a little more wing area than you at 272 sq in, but between two wings and a lot more wood.

The dihedral breaks are quite far out, so the wing is really in three sections of 12", 6" and 12". The original had 2deg dihedral which I upped to 3deg. Joiners are 1/32 ply.
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Re: Douglas World Cruiser
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Pete Fardell
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« Reply #6 on: January 05, 2018, 06:45:39 PM »

Gorgeous looking wings! And the trillion leading edge riblets are the icing on the cake.
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Tim Horne
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« Reply #7 on: January 05, 2018, 06:54:55 PM »

It felt like two trillion, but actually a mere 169! Grin
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Hepcat
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« Reply #8 on: January 05, 2018, 07:28:27 PM »

Tim,
I did think, "wire you building something so difficult?" Then I realized that when it was finished that you could really Strut your stuff.
Happy and industrious New Year. (Loved the excellent photographs of the Douglas)
John
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« Reply #9 on: January 06, 2018, 01:19:01 PM »

Very nice! Are you going to do floats?

A.
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Tim Horne
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« Reply #10 on: January 06, 2018, 02:41:15 PM »

Hi John, Happy new year to you too!

I know I do make things hard for myself sometimes, but I can't bring myself to making a Lacey or Piper Cub. I prefer the obscure Grin.
In terms of strutting; Wire? is the wrong question. I am going to apply myself to the task (I need a "groan" emoji here). Sorry if that's unintelligible; It's a corny way of saying that the DWC is actually quite straightforward in some ways. The interplane struts are ply sandwiched between two layers of balsa sanded to section and the centre section struts which run through the wing to the U/C will all be the same. The only wire parts I think I will need are the wheel axles and the prop shaft.

Andy, I would love to make the float version, or even better make both and have them interchangeable. But they would only make a heavy model (mine always are!) even heavier as they are huge compared to the wheels.

Interplane struts pic
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Re: Douglas World Cruiser
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Tim Horne
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« Reply #11 on: January 06, 2018, 03:24:27 PM »

Next up is the fuselage. I'm just building over the 3-view and making it up as I go along.

Speaking of which, I should have mentioned that this is probably the best documentation I have ever had for a model. The 3-view is from Aeromodeller April 1964 and seems pretty good to me. I also have this Summer 1990 "Air Enthusiast" magazine and a set of photos of one of the surviving DWCs, No 4 "New Orleans" which is in the Air force museum at Wright-Patterson Air force Base (if it is no longer there, please let me know).
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Re: Douglas World Cruiser
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Tim Horne
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« Reply #12 on: January 06, 2018, 03:28:33 PM »

Fuselage pics.

Main box is 3/32 sq. Sheet parts are 1/16. Sheet for surface areas is 1/32 sanded down to about 1/40. Rear deck stringers are 1/16 x 1/32.
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Re: Douglas World Cruiser
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« Reply #13 on: January 06, 2018, 03:54:38 PM »

Wow, that's quite an undertaking  Shocked
Really looking forward to this progressing  Smiley
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Pete Fardell
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« Reply #14 on: January 06, 2018, 06:53:18 PM »

Looks really good. Very impressivly fast progress as well- I thought I was building too, but now not sure quite what I've been doing for the last couple of weeks!
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g_kandylakis
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« Reply #15 on: January 07, 2018, 08:22:18 AM »

Nice subject Tim!

And proceeding rather quickly, from what I see... Always great to see a beautiful wood structure!

George
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danmellor
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« Reply #16 on: January 07, 2018, 12:49:00 PM »

Tim, that's going to be great! Lovely woodwork...

Cheers,

Dan.
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ffscale
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« Reply #17 on: January 07, 2018, 02:50:30 PM »

Love your choice of subject Tim - and a very nicely executed fuselage.  Looking forwards to seeing this come together.

Mike S.
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billdennis747
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« Reply #18 on: January 07, 2018, 03:06:53 PM »

It´s a really good subject and I can see it going very well.
I´m still smarting from the amount of noseweight I had to use to balance my Caproni, sending it over the limit. It might be worth shaving some weight from the back. For example if you use diagonals in tension only, they can be 1/16 x 1/32. It worked on open rubber duration models with 120g of rubber!
I wonder why hitherto the Douglas has been overlooked - it would make a great diesel model.
Bill
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Tim Horne
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« Reply #19 on: January 07, 2018, 07:33:38 PM »

Thanks for the kind words gents. As to the speedy work; I have been working on this since Nov and progress will now slow down dramatically as I'm back to work tomorrow. I seriously doubt my chances of being done for this years Nats but I will try.

Bill, I also wondered at the lack of attention the World Cruiser has had. There is a Henry Struck 23" rubber powered plan on Outerzone and some big RC builds if you Google it but nothing else.
As to keeping the weight down at the back; I'll try but It's not easy. I can never get the right balance between light and flimsy!

This is where I am at after my holiday. Not much further except it looks better when assembled into an aircraft shape. I have cut the cockpit openings and I have made a start on the stab and elevator.

Tim
Attached files Thumbnail(s):
Re: Douglas World Cruiser
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Glenn (gravitywell) Reach
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« Reply #20 on: January 08, 2018, 02:32:57 PM »

Such a beautiful structure.  Seems a shame to cover it.
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Russ Lister
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« Reply #21 on: January 08, 2018, 03:39:14 PM »

Ooh this looks so good, Tim  Smiley
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« Reply #22 on: January 08, 2018, 04:30:13 PM »

This is both a great subject and a great build.  I agree with the collective bafflement as to why it is infrequently modelled.  Ditto the Douglas Mailplane which must surely be another great subject.  Very nice treatment of the cockpit coamings by the way.
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DWCollins
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« Reply #23 on: January 08, 2018, 05:32:24 PM »

I agree beautiful.
I have looked at it over the years just never got around to building one.
ZK-AUD all the louvers on the Mailplane always stopped me.
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flydean1
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« Reply #24 on: January 08, 2018, 05:39:33 PM »

[quote author the Air force museum at Wright-Patterson Air force Base (if it is no longer there, please let me know).
[/quote]

The Air Force Museum is still at Wright-Patterson Air Force Base.
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