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L39"Albatros" 90mm edf
Thank you for purchasing L39 Albatros from www.rbckits.com
For the first time, R/C enthusiasts we have a choice in scale and fun flyer aircraft designs.
Our goal, through computer technology and state-of-the-art production techniques, is to offer aircraft
which in the past have not been modelled simply because they weren't popular enough to justify mass
production. Our production techniques allow us to produce aircraft which, though not as popular and
well known as P-51s and P-47s, still offer historical significance (good or bad!), Good looks and flying
characteristics, and a uniqueness that is sure to turn heads wherever you take your airplane!
Your airplane has many unique features in its design:
CAD Design
CAD design allows strength to be built into the airplane without sacrificing weight. Accurate parts
design and placement ensures a perfect fit.
CAD Drawn Plans
The plans in this kit are not copied from a master set! They are originals drawn directly from the CAD
program where the airplane was designed. We do this because it allows us to use colour, which helps
you better visualize the various components of the airplane, and we can use better quality paper,
which greatly reduces the possibility of shrinkage.
Since you're going to build directly on the plans, they ought to be the proper size! Also, parts
placement is guaranteed to be accurate, so you can build a better, straighter model.
Small and hard-to-produce parts are simply a computer file away, so you get a more accurate airplane.
Lightening Holes
Lightening holes are cut into all ribs and formers where possible and justified. This allows us to keep
Pagina 1

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Summary of Contents for RBC kits L39 Albatros

  • Page 1 L39“Albatros“ 90mm edf Thank you for purchasing L39 Albatros from www.rbckits.com For the first time, R/C enthusiasts we have a choice in scale and fun flyer aircraft designs. Our goal, through computer technology and state-of-the-art production techniques, is to offer aircraft which in the past have not been modelled simply because they weren’t popular enough to justify mass...
  • Page 2 Lexan General Building Information The L39 ALBATROS can be built by a person with experienced building skills. It is not designed for someone who has built a trainer or low wing sport plane. No unusual building techniques are required, although more difficult areas are explained in detail where necessary. Certain steps in the building process must be followed as depicted, or you might find yourself digging back into the structure to redo something.
  • Page 3 L39“Albatros“ 90mm edf Material you might need: Balsa knife, Stanley knife, straightedge, building board 1700mm, ca glue medium, thin, thick you need approx. for wing and vertical stabilizer sheeting 4 bottles thick and 2 bottles medium for rib gluing,, fuselage 1 medium for formers … thick for sheeting building nails, tape Also use white glue, and canopy glue, epoxy for the canopy and cowls Some drilling and bending tools, wire cutter, safety goggles etc.
  • Page 4 L39“Albatros“ 90mm edf Use the 8mm dowels, you can glue them, but take care of the length. Sheet Place your steering servo inside rudder and route the wiring Sheet other side and make rudder also. Place leading edge and pre sand fairings, sand rudder and tip, Pagina 4...
  • Page 5 L39“Albatros“ 90mm edf Place leading edge at rudder and sand to shape, place rudder tip and sand to shape place fairings and sand to shape Pagina 5...
  • Page 6 L39“Albatros“ 90mm edf Horizontal Stabilizer: Make the parts as per plan and take out all parts from their sheets, sand of all small holding tabs Cut the sheeting from 1,5mm balsa to the plan and sheet assembly do not glue the dowels yet just place them in to help for straightness Turn over stabilizer clean edges and sheet other side.
  • Page 7 L39“Albatros“ 90mm edf Place stabilizer fuselage with the dowels taking care for straightness in accordance with rudder the elevators have each a separate steering wire the rudder has a servo inside. You can make dummy trim tabs, looks nicer. Wing: Place wing drawing under a sheet of clear plastic.
  • Page 8 L39“Albatros“ 90mm edf Start by making the wing sheeting from 1,5mm balsa as per plan, see the templates for cutting the sheets and the wing top view for the glue and cut template, and do make oversize! And join with tape and ca Take out all parts that are needed for the wings and clean them up with a sanding block from the small holding tabs.
  • Page 9 L39“Albatros“ 90mm edf Make the main formers from cnc parts and the 3x3 spruce along a straightedge Place the capping to the mainformers to take the joiners; do not glue the joiners in yet Pagina 9...
  • Page 10 L39“Albatros“ 90mm edf Place the Retract former R8/9 into R2 and R3, gluing is ok these parts Make up the wing framing with ribs and formers, , place retract formers ribs combo step by step place ribs and formers, a drop of glue may help holding but do not glue all yet Pagina 10...
  • Page 11 L39“Albatros“ 90mm edf Place flap and aileron formers Draw up rib and former lines on sheeting, place some scrap fill under retract formers to take the space between formers and sheet, sand to shape first, then place assembly to sheet Set up the frame work with ribs and main formers and place in position on bottom sheeting.
  • Page 12 L39“Albatros“ 90mm edf Place sub leading edge and flap and aileron edges, mark edges through sheet, easier for later Place servo doublers and scrap fills for hinges and horns, place ribs from scrap for flaps, cut ribs for taking flap and aileron leading edges, Place servos ,make openings at bottom and mark hinge lines flap and aileron.
  • Page 13 L39“Albatros“ 90mm edf Sheet top of wing, we joined the trailing edge with tape and then flipped over the sheet to the top. Now mark trailing edge as per plan and cut clear the trailing edge and sand, take out ailerons and flaps,.check disk for pictures.
  • Page 14 L39“Albatros“ 90mm edf Join wings with the spruce joiner, make sure for a good fit do try and test do make it slide easy in and out , Do glue with epoxy do not use white glue (it will seize direct and you spoiling your wing) Use strip of glass (160gr) to join the wing Make flap and aileron hinges as per plan.
  • Page 15 L39“Albatros“ 90mm edf Make z-bends for aileron and you need a kwiklinks for the flap steering for adjusting (see pictures) Clean up retract space and place retracts, we used electrics.do try fit and working We make the retract covers from 0,5mm aluminium sheet and flattened 5mm brass tube When your retract is stalled when retracted, most of the time it is because of too tight closing fit, a little push will open the set it is binding in closed position, we solved this by adding a small piece of wood between leg and housing, this keeps the retract open enough to not bind, just try with some...
  • Page 16 L39“Albatros“ 90mm edf After fuselage is finished. Mounting the wing to the fuselage... drill the 5mm for the fasteners place fastener rings line out wing and glue rings to wing. Place belly formers and sheeting sand to fit fuselage Pagina 16...
  • Page 17 L39“Albatros“ 90mm edf Fuselage: Take out all parts and clean up the small tabs on the parts. Make the front retract parts , join the retract 12x3 ply with glass and white glue or epoxy, step by step join front retract strip 3x12 with some glass between them Place all formers as per drawing in the sequence as shown Note that F13 is in 1 piece no need for joining, we have basically a front part a mid-part and a back part of the fuselage, and front part formers are placed...
  • Page 18 L39“Albatros“ 90mm edf Now place retract formers in front, place canopy framing F22 place F11 and place F12 Midpart. Make former F19 with doubler place F20 to F19; place F29, F31, and F32 Place F25, F26, F27 and place F28, note that all is done without gluing, or maybe a small drop to hold parts.
  • Page 19 L39“Albatros“ 90mm edf Now place the temp build moulds F47to, F46, F45, and F44 the formers with a small drop of glue just to hold them Draw a straight line onto your building board, and place the fuselage to the board with the help formers lined out and glue the help formers with a drop of glue to the building board, start in the front step by step Join the front and the midpart of the fuselage...
  • Page 20 L39“Albatros“ 90mm edf Place the formers for the back part of the fuselage step by step until you are at the tail end, place the Build helpformers F43, F44 to the building board Pagina 20...
  • Page 21 L39“Albatros“ 90mm edf Carefully line out the fuselage, do not glue yet (maybe only a drop of help glue here and there. Now place the Horizontal and Vertical stabilizer temp in the openings (do not glue) Line out the fuselage make sure all is straight rudder in line with the fuselage etc., maybe you have to loosen a helpformers and push or pull here and there.
  • Page 22 L39“Albatros“ 90mm edf Now make the outlet duct from paper , first the outlet cone , glue it to the formers , make the large tube from paper , roll it up and place into fuselage mark and cut the surplus, place it and and when you are sure all is straight glue to formers , now the fuselage is stiff and ridgid You can carefully glue the remaining formers with medium ca or thin white glue Pagina 22...
  • Page 23 L39“Albatros“ 90mm edf There are some small parts to glue to the formers to take the sheeting F39, F40, F21 Start sheeting the top of the fuselage with 2mm balsa sheet 800mm long you also can place the steering cables Cut carefully the openings for the rudder dowels Pagina 23...
  • Page 24 L39“Albatros“ 90mm edf Now start sheeting with 2x12x950 balsa strips, do not throw away small leftovers do not cut unnecessary We started with the nose. you might want to support the fuselage in the cockpit area. Sheet sides as far as you can. Pagina 24...
  • Page 25 L39“Albatros“ 90mm edf Place side fills to F20 and sand to follow the fuselage lines. And sheet Make the small pieces for the front and back from leftovers also the steering wire openings Now loosen the fuselage from the building board, turn it over, we used our medium model stand for this, this is really a great help, for building and later for assembling and maintenance all models You can place the wing mounts also now with a M5 nut glued in Pagina 25...
  • Page 26 L39“Albatros“ 90mm edf Sheet the bottom of the fuselage. Make the nose cone and former F1 with the 4mm dowels carefully cut the edge of the nosecone for a good fit to the fuselage. The tail outlet end is cut to shape as per plan , you might fill it up with a piece of paper and the wing fairing formers F16 and F17 are placed also the 0,6mm ply fairing sheet cut to fit Pagina 26...
  • Page 27 L39“Albatros“ 90mm edf Place the wing and place fairing and place fairing supports form 6x6 balsa and sand to shape to take the 1,5mm sheet, fill the front fairing with balsa scrap and sand to shape. Place canopy back from F23 and F24 and 2x12 strip sheet place intake lips and sand to shape. Place wing to fuselage, place horizontal stabilizer and line out with wing when satisfied glue, place fairing from scrap Place Vertical stabilizer and servo wire, pre sand the fairings.
  • Page 28 L39“Albatros“ 90mm edf Cut the wheel wells, retract openings in the wing and belly. And line with balsa Make the rudder and elevators and flaps and ailerons as per plan. Canopy. Place canopy formers to CF3 and try fit to fuselage with a canopy latch and the 4mm dowels. Pagina 28...
  • Page 29 L39“Albatros“ 90mm edf When fitting is ok place seats and instrument panels. Paint and place pilot figures. Cut the canopy to size and clean with window cleaner do not touch it with bare hands , or it will Fogg when gluing the canopy to the frame with ca or use canopy glue Place the elevator servos use a zigzag bend for sub trim 1 elevator.we used a Y-cable Pagina 29...
  • Page 30 L39“Albatros“ 90mm edf Place flap hinge covers from the vacuum formed parts Place steering arms etc. we used as much z bends as we can only for flaps we used quick links to trim. Pagina 30...
  • Page 31 L39“Albatros“ 90mm edf Place aluminium retract covers, we did not place inner hatch covers, you can do this easy, open up front retract hatch Make the retract steering arm from polycarbonate .bend the front shaft leg from 4mm steel Make the hatch from 0,5 alu sheet hammer it in shape with wood dowel or cupping hammer. Hinges are screwed to hatch and fuselage, Place some ply here ,We close and open the hatch with a 3,5mm spring from a big O-ring, alternative method work great is a bit more work and better as shown on the plan...
  • Page 32 L39“Albatros“ 90mm edf Make some air intake openings on top of the fuselage The outlet is the opening at the fuselage where the wing is mounted EDF mounting Use the wemotec midi fan evo or schuberle fan (that fans do work do not use a fms fan or something this will not work in a rbc kit edf jet), slide the between duct in the outlet duct fasten with tape , fit fan and fasten with 2,9x13 fasteners Place speed controller and receiver also there, place battery’s in front of fuselage , fastened with...
  • Page 33 Flying: The L39 Albatros easy lifts off with a bit of flap (10mm) and is easy to fly and is fast, landing: plan it in with some speed up and land it as usual little flap a bit of throttle is ok, The L39 Albatros glides very well with wheels in in case of ….
  • Page 34 L39“Albatros“ 90mm edf https://hobbyking.com/en_us/corona-ds339mg-digital-metal-gear-servo-4-4kg-0-15sec-32g.html Main landing gear legs used 4mm steel wire with 1 curl bend in see drawing https://hobbyking.com/nl_nl/servoless-retract-with-metal-trunnion- 33mm-x-35mm-mount-2pc.html?queryID =8de21d83961973eaec5e38a475ef6f4c&objectID=3814 We used a midi fan evo with hetrc edf 650-68-1500 and 8 cells 5000 WWW.RBCKITS.COM Rontgenweg 16G 2408AB Alphen aan den Rijn Netherlands Pagina 34...