RC Groups

RC Groups
    Flight Accessories
        Alert DC-3 scale retract

#1 krles Mar 05, 2012 02:02 PM

DC-3 scale retract
2 Attachment(s)
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 http://www.rcgroups.com/forums/showthread.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

#2 charlesconklin Mar 11, 2012 09:35 PM

Wow! Do you think the info would work on a 1/12 scale DC-3? Is there a cost?

#3 krles Mar 12, 2012 01:46 AM

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.


#4 aerofly0610 Mar 20, 2012 10:02 AM

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!

#5 charlesconklin Mar 20, 2012 02:30 PM

If I could download it, that would be great.

#6 krles Mar 21, 2012 03:08 AM

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

#7 whanderson Mar 22, 2012 07:51 PM

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.

#8 krles May 12, 2012 04:34 AM

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.


#9 E3K Jun 13, 2012 08:43 AM

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.


#10 krles Jun 14, 2012 12:22 AM

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

#11 Hunkeler Dec 03, 2012 11:33 AM

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

#12 Hunkeler Dec 03, 2012 12:24 PM

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.

#13 krles Dec 05, 2012 12:30 AM

to Hunkeler: PM sent.


#14 krles Mar 13, 2014 03:50 AM

plans rescaled
3 Attachment(s)
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):



#15 charlesconklin Mar 17, 2014 04:44 PM

Wow, and I thought my 2.4 meter (8 ft) was large.

All times are GMT -5. The time now is 06:11 PM.