Home Wood Model Airplane Plans Joined-Wing Skycar

Joined-Wing Skycar ( 38.5 in. / 97.8 cm )

Plan listing thumbnail Prev Next Plan
This is the Joined-Wing Skycar listing page, here you can download the plan, article and see the main thumbnail and extra images.

Joined-Wing Skycar model airplane plan

Joined-Wing Skycar

RCModeler's Joined-Wing Skycar

The Skycar is a most unusual sport aircraft designed by Ken Willard and Bob Andris, that features a novel "joined wing" aircraft configuration developed by Julian Wolkovitch in the early 1980s. The JW configuration can best be described as two tandem wings arranged in a diamond configuration. Although the Skycar design uses a vertical stabilizer, a conventional horizontal stabilizer isn't required, and the rearward wing panels contain "strip" ailerons and elevator surfaces. The JW's technical advantages include strong and stiff structure, lighter weight, greater lift, and less drag than conventionally designed aircraft. Boeing and NASA investigated the JW configuration with proto-design flight tests in the late 1980s, evaluating stability, control, and performance for commercial passenger aircraft, cruise missiles, and drones. The model design presented in the plans is a pusher engine design (an OS .10 is shown on the plans) and features all-balsa construction. Although the Skycar's construction is straightforward, prospective builders should pay particular attention to the importance of maintaining proper alignment of the "diamond shape" wing surfaces.
UPDATE: AeroFred editor "hogal" has raised the valid point that although Julian Wolkovitch is credited with the 'joined wing' design configuration in the 1980s, due credit belongs to Britishers Norman Hall-Warren and Rex Young who developed the original joined wing design approach in 1926(!) and received a British patent in 1937. A 36" span free flight model was published in Aeromodeller magazine, the "Ace of Diamonds", August 1958.
UPDATE(2): In the 80s and 90s, interest in the joined-wing concept was high, based on the aerodynamics advantages for High Altitude/Long Endurance (HALE) UAVs. American and British researchers published numerous technical analyses on performance, parametric sensitivities, flutter margins, and other aerodynamic topics backed up by extensive numerical analyses, wind tunnel tests, and fairly large-scale remote control test models. Curiously, all the researchers credited Wolkovitch with the joined wing concept, even the British researchers, and Wolkovitch was awarded several American patents on various aspects of the joined wing approach.
UPDATE(3): In the original RCM article on the model aviation Skycar, model designers/builders/fliers Ken Willard and Bob Andris established contact with Norman Hall-Warren and copies of their correspondence are included in the RCM article, quite fascinating! http://outerzone.co.uk/planfile_supplement/6551/Skycar_oz6551_article.pdf To the best of my knowledge, the Willard/Andris article is the best
"circle back" to the original joined wing designers, something that escaped all the joined wing researchers in the 80s and 90s.

Link to this page: https://aerofred.com/details.php?image_id=90836

Sources: http://www.freepatentsonline.com/4365773.html
Sources: https://books.google.com/books?id=f2_sPyfVG3AC&printsec=frontcover#v=onepage&q&f=false
Details: Full Details
ID: 90836
File Size: 1.8 MB
Type: Airplane
Class: Radio-Control
Use: Sport
Motor: Glow-Powered
Motor Size:0.049-To-0.15-CI (2-strokes)
Wingspan: 38.5 in. / 97.8 cm
Publisher: RCModeler
Magazines:  More at RCBookcase
Pub. Ref: 402
Designer: Ken Willard, Bob Andris
Date: 08/1969
Weight Class:300g-To-500g (10.5oz-To-17.6oz)
Listing Editor: aeroastro
Added: 24/05/2015 10:14
Updated: 24/05/17 05:35:40am
Corrections? Contact aeroastro
Need Help? Forum
Filetype: .pdfSoftware for .pdf files

Member Profile for aeroastro

Hi! I'm aeroastro

Fascinated with model aviation since a youngster, my modeling experience includes control-line, indoor modeling, competition free flight, r/c competition thermal sailplanes, r/c electric powered models, and more recently, Giant Scale r/c models. After gaining an MIT Aeronautical/Astronautical degree, I served 29 years in the USAF in the space and missile fields, serving as Program Manager for two major space programs. Presently retired and residing in Southern California, enjoying its year-around excellent

Download Main Plan file, possible versions and from alternative sources if available.

  Order Prints  Article

Plan details Prev Next Plan
These are the details for the "Joined-Wing Skycar" plan. If you would like to become a plan editor and help us to edit the attributes of all the plans in the website please click the "Edit Attributes" button below.

Plan Attributes: Edit Attributes
Plan ID:90836
Keywords:Skycar joined wing willard andris wolkovitch diamond wing Norman Hall-Warren Ace of Diamonds
Model Type:Airplane
Aircraft Use:Sport
Wingspan: 38.5 in. / 97.8 cm
Wingspan Class:75cm-To-100cm (30in-To-40in)
Wing Position:Multiple-Wings
Wing Style:Straight-Wing-Trap
Wing Dihedral:Dihedral
Landing Gear:Tricycle
Motor Type:Glow-Powered
Motor Size:0.049-To-0.15-CI (2-strokes)
Number of Motors:1-Pusher
Weight Class:300g-To-500g (10.5oz-To-17.6oz)
Construction Skills:Novice
Pilot Skills:Novice
Magazines:  More at RCBookcase
Designer:Ken Willard, Bob Andris
Category:Wood Model Airplane Plans
Similar:Plans like Joined-Wing Skycar

Thinking about this one? Prev Next Plan
If you know about a building log for this plane please post a comment, we will add it to the listing here.

Building Log on our forum
Start or participate on a building log at out forum

Order your Joined-Wing Skycar prints today!
The Joined-Wing Skycar plan can be printed on plain paper, tracing paper or polyester film and shipped worldwide.

Plans Service Calculator

This calculator will work on pdf and image format files, if the file is very large, 5 or even 10 Mb it will take longer to process the plan file, it may finish even after the button animation stops spinning, please be patient when calculating larger files.
* When ordering multiple plans you can set the Packaging Type as "None" on the second plan and up.

Ordering Prints
This tool allows you to calculate the cost of printing and shipping the Joined-Wing Skycar plans and its building article if available.

How to use
  1. Set the options on the left and click the Calculate button
  2. Change the options to match your needs, Polyester plans must me shipped rolled.
  3. When you're happy with the results click the Paypal Button and finish the checkout.
  4. I will review the order, print and ship within one business day.
Ordering several plans
  1. If one of the plans is Tracing paper or Polyester, select Cardboard Tube and all the other options and click "Add To Cart"
  2. Add the second plan without Packaging "None"
  3. Only need to add Tracking once.
  4. If there is any overcharge we will issue a refund after shipping via Paypal.
Requesting a Resized Plan
  1. If you need to resize a plan please contact us with the ID:90836 and the desired wingspan.
  2. We will send you a resized pdf for evaluation and upload the new file to the site so you can place the order.
Printing plans that are not on the site
  1. The best option would be to upload the plan and use this calculator at it's page.
  2. Alternatively you can use this tool
  3. Please follow the instructions on that page.

Terms of Service.
Please read the Plans Printing Service Terms of Use before placing an order.

About the plan source:

You should verify if the source file has the quality for the type of construction you intend to do, we will print the file without any kind of enhancement or scaling. To know if the file is good please download it and open it on a pdf viewer like Adobe pdf viewer and set the view level or zoom level to 100% or 1:1 or full scale or actual size, depending on which version or pdf viewer you are using. Also, using the measuring tool make sure all the parts fit together and have the correct size.

Plans Scaling:

We can scale the Joined-Wing Skycar or any other PDF plan for you. But please keep in mind that if this plan is not vector, if you enlarge it too much the quality will be degraded.
To order a scaled plan please copy the plan url or the following ID (ID:90836) and send us a message with the desired wingspan and any other info you may find useful.

You will receive:

  • Waterproof Laser Printed plan on good quality Bond paper or/and Tracing Paper and/or Polyester sheet, depending on what you have purchased.
  • Rolled sheets, up to 5 or 6 in the same cardboard tube.
  • Envelope, up to 3 or 4 sheets per envelope.
  • Articles and Instructions if we have them for the given plan.
  • Air Mail, economic and reliable.

About our printers:

We use professional quality laser OCÉ and Canon printers/copiers, these printers use toner, not ink so the printings will be durable and waterproof.

About the different media types:

Bond Paper: White Bond paper, 80 grams per square meter.
Bond Tracing paper: Bond Tracing paper, 90 grams per square meter.
Polyester film: High quality polyester sheet incredibly durable, will resist cuts and glue and can be washed (I use it as sail material on my RC sailboats).


We will use brown padded envelopes for folded plans and hard cardboard tubes with plastic ends for rolled plans.


We ship from Portugal, Europe and use the reliable Portuguese mail system CTT.
CTT has delivery agreements with different entities on each country so if you´re from the US you may have your order delivered by USPS, in the UK may be Royal Mail and so on.
Orders are dispatched on the next or second business day after purchase.


We charge according to the ctt.pt postage table.


Tracking is available and is recommended. Someone will have to sign the order at the delivery address.


Please keep in mind that when you order a plan it will be printed specifically for you, just like when you go to a local print shop.
Before ordering please make sure that the plan will fit your needs, in doubt please ask us for an opinion. If you still receive a plan you don´t like we can accept it back if it is in good conditions but we will not refund the postage from the initial order, you will have to pay the postage to return the plan to us and a 30% re-stock fee will be applied so please, in doubt, please ask us for an opinion.


Orders can be paid with Paypal or Credit Card via Paypal and are shipped to the address on your Paypal account or to the address you set at checkout.

About the Calculator:

The Plans Price Calculator will read the plan file and output all the information on the panel to the right according to the selected options, you can change the options and request a new quote at any time.
If you would like to print a plan that is not on the website you can upload it to the main plans category in pdf format, multiple sheets in the same pdf file, and use the Plans Price Calculator to get a quote and place the order.

Questions or comments about the Joined-Wing Skycar? Your comments may help others to build this model...

Joined wing plane hogal on 19/05/2017 04:36
It seems stange to me that this plane was hosted as a new concept in the 80's when the Ace of Diamonds designed by George Wools first appeared in the August 58 Aeromodeller. In the article descibing the design George attributes the concept to Norman Hall-Warren and Rex Young who were granted a patent in December 1937. He also goes on to descibe the concept of the wing and how it is thought to work.

I must also say that the Ace of Diamonds is also a much prettier plane although more of a challenge to build.
updates and appropriate credits for the joined wing aircraft configuration aeroastro on 24/05/2017 01:27
Hogal - you have keen eyes and a great memory! I received your comments recently, researched the issues, and have
updated the Skycar writeup appropriately. If you have any comments on my updates, please feel free to contact me.

Peter Young ("aeroastro")
Please Login to Comment

IA-46 Ranquel model airplane plan
Elanic model airplane plan
Aero A14 24in model airplane plan
Rookie RC model airplane plan
Share Your Plans With Us

AeroFred.com is a Plans Sharing Community, not just a website to grab some plans.

Every day thousands of modelers visit us and download free model airplane and boat plans, plans shared by other modelers...

If you have plans that are not here please upload them, so others can build from them.

Upload a Plan

Please login first

Vintage Magazines by Hlsat
Details | Gallery | Article | Prints