DC-3 scale retract - RC Groups
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Mar 05, 2012, 03:02 PM
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krles's Avatar

DC-3 scale retract

Like many of you, once I wanted to build a big DC-3. But right from the start, arose the problem of how to make the landing gear in a scale look. Factory-made retracts did not meet my expectations, and so had to go my own way. The development was long , not easy and not cheap. I capitalized on it near to 20 years of my experience of a professional designer, knowledge of mechanical engineering and working with metals.
Now, after three flight seasons, I can say, the retract despite its low weight (580g each) is
solid, functional and reliable.
It's time to share with you the experience.
I have created a CD with comprehensive information about the construction of such retractable landing gear (scale 1:7.5).

Disc contains:

• computer simulations of the movement for a better understanding of the principle, rendered photographs, including a proposal for mounting in the model
• set of engineering drawings of all parts (more than 40), assembly drawing and bill of material
• photos of the finished landing gear in high resolution
• HD detailed motion videos of built in retracts
• brief description, hints and tips
Altogether it is over 200 megabytes of informations revealing the secrets of the landing gear divided into easy-directories.
A complete information is now available to anyone.
I am convinced that the information from this CD will save you a lot of time, materials and energy needed for your own development.
It is worth for those of You, who wants to build a retract yourself.
So, look here https://www.rcgroups.com/forums/show....php?t=1608215 to watch a short trailer….and…. if You are interested in, please send me a PM.

Tom Krles
Please note: The content of the CD is for home use only (not for commercial use).

Update May 12th: Tailwheel drawings added
Last edited by krles; May 12, 2012 at 05:21 AM. Reason: Tailwheel added
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Mar 11, 2012, 10:35 PM
Hey, Watch this....
charlesconklin's Avatar
Wow! Do you think the info would work on a 1/12 scale DC-3? Is there a cost?
Mar 12, 2012, 02:46 AM
Registered User
krles's Avatar
Principle is also valid for other scales. Dimensions of the parts in the drawings are good for scale 1:7.5. Those must be adapted in proportion to your scale.
The costs are:
12EUR + 5EUR shipping within Europe
17USD + 6USD shipping - rest of the world
Digital download-without shipping costs.
Paypal best.

Last edited by krles; Sep 09, 2014 at 12:49 PM.
Mar 20, 2012, 11:02 AM
Former B52H Crew Chief
aerofly0610's Avatar
Cool product. You can increase your sales by providing digital delivery. Use http://7-zip.org to create a package and send goods via https://www.wetransfer.com/ . Its all free!
Mar 20, 2012, 03:30 PM
Hey, Watch this....
charlesconklin's Avatar
If I could download it, that would be great.
Mar 21, 2012, 04:08 AM
Registered User
krles's Avatar

Download option

Okay, thank You Aerofly for Your good idea.

For all, (including You, Charlesconklin), who prefere download rather than receiving a CD via airmail, this option is now available.

How it works:
Mention this option in your PM.
You will receive an e-mail with a link to download the ZIP file (two weeks available).
....and....save the shipping costs.

BR Tom
Mar 22, 2012, 08:51 PM
Registered User
I got Tom's CD. Got it in less than a week. I am quite impressed with the work Tom has put into the DC-3 LG design. Well thought out and executed. I highly recommend Tom's CD.
May 12, 2012, 05:34 AM
Registered User
krles's Avatar

Tailwheel drawings

I added the tailwheel drawings and photos to the CD.
The landing gear documentation is hereby complete.

All, who purchased the CD, will receive this update by email shortly and for free.

Jun 13, 2012, 09:43 AM
Registered User

DC 3 Landing gear

Hi Tom,

I am currently building a DC 3 (C47 Skytrain), wingspan 8.2m with 2 Moki 400,weight around 100kgs.

South West of France.

If interrested I can send you the website link.

I would like to buy your CD, what is the procedure to buy it. If needed I can send my email address.

Jun 14, 2012, 01:22 AM
Registered User
krles's Avatar
I am of course interested in!
Send me the link.

Regarding the CD buying procedure, please read the posts #3 and #6 in this thread or simply send me a PM with Your email address.

BR Tom
Dec 03, 2012, 12:33 PM
Registered User
As Eric Kwiatkowski we created an association on the basis of construction projects DC3 C47 1/5.J 'have to work to create the prototype retractable landing gear and for that I search for documentation, schematic and plan to help me to achieve this pièce.C 'is the message that I ask you to make arrangements to acquire your CD.En thanking you in advance and remain at your disposal, please accept my sincere greetings.

Patrice Hunkeler
14 Bridge Street
Voujeaucourt 25420 (France)

patrice.hunkeler @ orange.fr (PayPal)

The link to our association:

http://flyinglegendswas.wix.com/flyinglegends #! home / MainPage
Dec 03, 2012, 01:24 PM
Registered User
Re goodnight,
I read in previous posts the payment to purchase the CD for me for me.
My Paypal address: patrice.hunkeler @ orange.fr
Good evening.
Dec 05, 2012, 01:30 AM
Registered User
krles's Avatar
to Hunkeler: PM sent.

Mar 13, 2014, 04:50 AM
Registered User
krles's Avatar

plans rescaled

Eric Kwiatkowski from France used my plans and rescaled them for his huuuuge DC-3 with 8 metres wingspan. As a powertrain he uses a 14,4 Volts handdrill with 4S LiPo and 8mm threaded rod.
Here are some photos and a link to the site (in French only):


Mar 17, 2014, 05:44 PM
Hey, Watch this....
charlesconklin's Avatar
Wow, and I thought my 2.4 meter (8 ft) was large.

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