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Old Sep 24, 2009, 04:24 AM
Scratch Builder
AlexanderB's Avatar
Braunschweig, Germany
Joined Sep 2006
1,325 Posts
Build Log
100" Douglas DC-6A Scratch build

Hi everyone,

one year ago I started to plan a scratch build of a DC-6, after my 66" DC-3 was completed. One year of planning and investigations brought a huge variety of material, espacially 6,000 pages of orginal Douglas Manuals I bought over the internet.
  • The idea is: 1:14,3 scale which gives a spanwidth of 2,5m (approx. 100"). This is all I can take with my car.
  • The fuselage will be split into two halfes over the wing to allow easier trasportation.
  • The outer wings will be detachable as well as the elevator.
  • The weight may not exted 6kg (approx. 212 oz). I hope that I manage that.
  • She will be flown electrically.
  • RC: Motors, aileron, rudder, elevator, flaps, spring loaded retracts, lights, steerable nosegear
  • Almost scale
  • Airfoil for the entire wing will be NACA 2415

Now the building part starts and I want to share this with you.

I cut a 1:72 plastic model into slices to get the cross sections of the fuselage. But this part will come later. I almost completely designed the wing. But the first thing I had to check if I manage to get the retracts half way scale.

So first I built a mockup of a part of the wing where the retracts are located. I also built a wooden mockup of the retracts and tried different ways to actuate them. I still have no solution for that but I might end up with a winch and a spring.

Here are some pics of the first steps. Enjoy!

Best Alexander
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Last edited by AlexanderB; Sep 24, 2009 at 04:30 AM.
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Old Sep 24, 2009, 06:12 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
6,002 Posts
Rock On!
DAG
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Old Sep 24, 2009, 01:02 PM
Scratch Builder
AlexanderB's Avatar
Braunschweig, Germany
Joined Sep 2006
1,325 Posts
Thanks Dag, when I look at your project ...

Here are some new pics of the landing gear. Everything works great. I'm glad that I managed it to build a landing gear that is close to the original.
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Old Sep 24, 2009, 09:02 PM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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Very cool stuff.
Great work,
DAG
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Old Sep 25, 2009, 01:52 PM
...design-build-fly-publish...
eye4wings's Avatar
Ware, herts. U.K.
Joined Sep 2008
3,436 Posts
Great start Alexander!
And your engineering beats mine to a pulp!

I shouldn't think you would have any trouble getting well within your weight limit - my 100" Liberator was about half that and flew really slow and scale - which a DC-6 needs to do as well.

Looking forward to seeing this one go together.
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Old Sep 25, 2009, 04:22 PM
Registered User
Phoenix, AZ
Joined May 2008
239 Posts
Yes! this will be good
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Old Sep 27, 2009, 04:12 AM
Scratch Builder
AlexanderB's Avatar
Braunschweig, Germany
Joined Sep 2006
1,325 Posts
Thank you all for your encouragement!

I did a little more and managed to mill the foldable strut and completed the main landing gear.

To find the exact lengths and distance between the holes was quite tricky. So these strut-parts are unfortunately not usable. I have to mill new ones. But the whole folding and retracting if the landing gear proved to work. Next will be the way of actuating the gear. I start with a mill.

Best Alexander
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Old Sep 27, 2009, 05:18 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
6,002 Posts
Quote:
Originally Posted by AlexanderB
Thank you all for your encouragement!

I did a little more and managed to mill the foldable strut and completed the main landing gear.

To find the exact lengths and distance between the holes was quite tricky. So these strut-parts are unfortunately not usable. I have to mill new ones. But the whole folding and retracting if the landing gear proved to work. Next will be the way of actuating the gear. I start with a mill.

Best Alexander
Looking great. Really cool.
DAG
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Old Oct 01, 2009, 02:10 AM
Scratch Builder
AlexanderB's Avatar
Braunschweig, Germany
Joined Sep 2006
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I had further thoughts aubout how to make sure that the landing gear deploys safely and stays deployed if I use a winch to pull it up. I experimented with a spring attached to several points but it was always the same problem: what do I do if maintenance is necessary? If the spring disappears in the wing, how do I attach it again it in case?

So I took a deeper look at the Douglas manuals I own and the pictures I took in Salzburg. Two quite big springs attached to the uper drag link (this is how this part is called by Douglas) made me curious. So I added one spring and rope to my landing gear and looked how it works. Regarding the geometry it was clear that this spring and rope will help keeping the drag link in place and therefore keep the landing gear in deployed position.

After I actuated the landing gear by hand I got really excited! It was not only that the spring holds it in deployed position. It also helps lifting the landing gear and minimizing the load when in retracted position!

Anothe major problem solved!

Best Alexander
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Last edited by AlexanderB; Oct 01, 2009 at 02:48 AM.
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Old Oct 01, 2009, 11:29 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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111% great!
DAG
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Old Oct 01, 2009, 11:39 AM
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Alexander, awesome work!

Subscribed.

Cheers

Brent
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Old Oct 01, 2009, 12:42 PM
Deal Honestly or Don't Deal
United States, SC, Taylors
Joined Jun 2004
612 Posts
Great keep it going and reporting your progress.

Boy, I wish I had 1/4 the ability some of you guys have with these models.

sarg96
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Old Oct 01, 2009, 03:03 PM
Registered User
Guadalajara, Jalisco, Mexico
Joined Mar 2004
305 Posts
Hello Alexander:

Congratulations on your work on this incredible landing gear for your DC-6!!!


Best regards,

Jorge
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Old Oct 01, 2009, 04:33 PM
Vintage Flyer
Indiana
Joined Jan 2005
1,674 Posts
One of my all time favorite airliners!
Keep up the great work!
Airplanes with round engines are great!

Ed
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Old Oct 02, 2009, 03:04 AM
Scratch Builder
AlexanderB's Avatar
Braunschweig, Germany
Joined Sep 2006
1,325 Posts
Wow, thank you all for your nice comments. I'm afraid I put more effort in that landing gear than others do for a whole plane

Yesterday I got a new CAM software (Cut2D) for my mill that allows me to do even more sophisticated parts. I completely redesigned the drag link and manufactured it yesterday. It proved that I still had 1mm difference in the boreholes. Plus I needed some changes. But now I hope everything works. My engineering approach is more or less trial and error

Here's a preview of what the mill will do. More this weekend.

Best Alexander
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