Jungster 1 Biplane Info

What is a Jungster Biplane?
It is a homebuilt aerobatic biplane that has been around for a long time.  Many have been built.
Here is a picture of one built by Gunnar Iversen of Norway

The Jungster Papoose RK1 was designed by Rim Kaminskas of Los Angeles, CA between 1957 and 1964.  Rim is an aeronautical engineer.  He designed it to be simple and strong.  He based it on the Bucker Jungmeister. (see pic below)  The Jungster 1 is different from some other small homebuilt biplanes. It is what is called a wooden airplane.  That means that much of the structure is made of wood (aircraft grade sitka spruce of course!)  There are fittings that are 4130 steel and the struts, landing gear, engine mount is made of 4130 tubing.  Rim designed the Jungster 1 at aprox. 8/10 scale, with aerobatics in mind.   The prototype first flew in 1962.    It is a single place ship.


  The German designed Bucker Jungmeister, (Bevo Howard's picture is below) one of the first really great aerobatic airplanes.  It is legendary for  control smoothness and response.

  The picture at the top of the page is a Jungster 1 built by Gunnar Iversen in Europe.  Notice the similarities of lines to the Jungmeister.  Rim designed it more to get the flying qualities of the Jungmeister.  Bud  Davisson (writer for airplane magazines) says the Jungster 1 flying qualities are very similar to the Bucker Jungmeister.   The Jungster 1 is very simple to build, however no kits are available.  The plans are clear and easy to follow, just like building a big model airplane.   If you build it light, and set up the landing gear properly it is not hard to fly.    The Jungster 1 has a longer fuselage (thus longer distance between front wheels and tail wheel) than other small biplanes.  

 



 

Here is a picture of the plane above before it was covered.  You can see the wooden struture.  This is appealing to many who find it easier to work with wood .  


Jungster 1 biplane specs:
Airfoil Modified Naca 4413
Cord 32 inches
Sweepback on wings 11 degrees.
Top wing and bottom wing both have dihedral (lower wing has more)

The wings use spruce and plywood for internal bracing  (most biplanes use expensive steel fittings, tubing and rods)
Wing ribs can be made two different ways: built up spruce sticks, or sawn out of 1/4 marine or aircraft grade plywood.

When built to plans, the fuselage is only 18 inches wide.  Some have added an inch or two to the width. This means some other mods had to be made to the fuselage and  top wing center section to make it wider too.

Dimensions
Wing span 16' 8'
Length      16'0"
Wing area 80 sq ft.
Empty weight 606 lbs
Gross weight 1000 lbs
Holds 16 gals of fuel
Wing loading 10.6 G's positive and 6 G's negative (stressed for aerobatics)

Prototype performance (0-235 Lycoming engine, wood prop, not electrical system)

Stall 52 mph
Cruise 119 mph

Climb 1500 ft per minute with 0-290 engine
Can use 85-150 hp engines.
The prototype was test flown to 200 mph with no flutter.

Easy to build.  Tools required:
Table Saw, Band saw, Drill press, Stationary belt and disk sander, small hand tools (plane, hammer, chisels etc.) Access to Acetylene welding gear.(borrow from an EAA buddy)  Use T-88 epoxy glue or Aerolite glue or Weldwood Plastic Resin glue.   The fabric can be glued to the wing ribs (no rib stitching), but you can do regular  rib stitching if you wish.  


                   
Below is what some of the plans look like.  Some of the fittings are full sized. The wing ribs are full sized too.



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