Joel Dirnberger's HBluO

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We suggest that you read through the instructions once before starting building to become familiar with the sequence of steps and the flow of construction

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Items required to build the plane:

A Hobby Knife and replacement blades or Snap Knife

A cork backed metal ruler, 18” recommended

CA Glue (regular or foam safe) and kicker

EPP Contact Glue (UHU por, Beacon Foam-Tac or Welders)

A piece of fine sandpaper to roughen the pushrod pieces for gluing

Velcro for attaching the ESC, Rx and battery.

Optional: four .032” EZ-Connectors for your pushrod attachments


1)           The wing platform will be assembled from the following Depron parts: Wing 1, Wing 2, Wing 3 (2) & Elevon (2).

2)           The leading edges of the Elevons and the trailing edges of the Wing 3s are beveled prior to hinging. Be sure to bevel the right and left sides as mirror images. 

3)           Hinge the Elevons to the Wing 3s using your favorite method. I have used Foam-Tac hinges in this photo. 

4)           The forward carbon spar is glued to Wing 1. 

5)           Check the fit of Wing 2 to Wing 1 and the forward spar. Sand the tabs on Wing 1 if required to insure a tight fit between Wing 2 and the spar. 

6)           Wing 2 is then glued to Wing 1 & the forward spar. 

7)           Glue the rear spar to the Wing 2/Wing 1 assembly. Check the fit of the Wing 3/Elevon assemblies to Wing 2 and the rear spar. Sand the tabs on the Wing 3s if required to insure a tight fit.

8)           And glue the Wing 3/Elevon assemblies to the Wing 2/Wing 1 assembly. 

9)           The hatch is assembled from the Depron parts Hatch 1 through Hatch 3.

10)      Gently preshape the part Hatch 1 to match the upper curve of the fuselage. Repeat with parts Hatch 2 matching them to the curve of the fuselage sides. 

11)      Test fit the Hatch 2s to Hatch 1. When you are satisfied with the fit, glue them in place. 

12)      Test fit part Hatch 3 between parts Hatch 2. When you are satisfied with the fit, glue part Hatch 3 in place. Set the hatch assembly aside to dry.

13)      Cleaning out the slots with an emery board or sanding stick. 

14)      In order to get parts to fit initially you may find it best to bevel the tab sides so they self align in the slots. 

15)      Gently pre-form the fuselage sides to match the curve of the slots in the wing assembly. 

16)      Test fit the fuselage sides into the slots in the top of the wing assembly. Do not glue them in yet. (The top of the wing assembly is the side without the bevels at the hinge lines) 

17)      With your radio or a servo tester, center the servos and mount the arms, making a left and right elevon servos and a rudder servo.

18)      Test fit the rudder servo into the Fuse side. Enlarge the servo hole if necessary. Mark the location where the servo arm will pass through the wing. 

19)      Cut the slot for the rudder servo arm through the wing. 

20)      On the bottom of the wing, bevel the ends of the slot to provide clearance at the ends of the servo travel. 

21)      Check the size of the servo opening in the Dorsal Fins and enlarge if necessary. 

22)      Test fit the Dorsal Fins and servos to the wing assembly. 

23)      Establish where the servo leads need to enter the fuselage, and cut a small notch in the Fuse Sides to allow the servo leads to pass through. 

24)      Mark the locations for the Elevon servos on the wing. 

25)      Remove the dorsal fins and glue the elevon servos in place. 

26)      Then glue the Dorsal Fins in place. Be sure they are perpendicular to the wing. 

27)      Test fit the nose Former to the front of the fuselage. 

28)      Bevel the edges as necessary to get the best fit. 

29)      Glue the Fuse Sides, Nose Former and rudder servo in place. Be sure the Fuselage Sides are perpendicular to the wing. After the glue has dried, use an emery board or a sanding stick to square up the top edges of the Fuse Sides. 

30)      The motor mount pylon will be assembled from the Depron parts Pylon 1 through Pylon 4 and the 1/32” plywood sheet. Remove the control horns from the pylon pieces before the next step. 

31)      Glue one of the plywood pieces to one of the Pylon 3s. Align and glue parts Pylon 1 and Pylon 2 to this plywood. Glue the remaining plywood piece to the exposed sides of Pylon 1 and Pylon 2 creating a channel for the motor wires to run through the pylon into the fuselage. Complete the sandwich by gluing the remaining Pylon 3 to the plywood. 

32)      Align and glue the Pylon 4s to the upper sides of the pylon. Glue the plywood motor mount to the pylon. Sand the pylon to round the edges and streamline the pylon to suit your taste.

33)      Test fit the pylon to the slots in the wing. Glue the pylon in place. Make sure it is perpendicular to the wing. 

34)      Glue a rare earth magnet into the hole in the Depron part labeled Magnet. 

35)      Check the fit of the Magnet mount in the fuselage. Sand it to fit if necessary the glue in place. 

36)      Test fit the Fuse Tail pieces to either side of the pylon. Sand them to fit if necessary then glue them in place 

37)      Gently bend the air intake portion of part Hatch 1 down until the outside surface of the air intake matches the inside surface of the hatch. Use a sharp hobby knife to trim away a wedge of Depron from the inside surface of the hatch to open up the rear opening

38)      Use a gap filling adhesive to secure the sides of the air intake. 

39)      Test fit the hatch to the fuselage. 

40)      Place a second magnet on top of the first. Use a dab of paint or a felt tip marker to transfer the location of the magnet to the inside surface of the hatch. 

41)      Use a hobby knife or a rotary tool to create a pocket in the hatch for the second magnet. 

42)      Glue the second magnet into the hatch. Make sure the magnet polarity is correct or it will not hold the hatch closed. 

43)      With the hatch in place, preform the Depron part labeled Nose to fit the front of the fuselage. There needs to be a bit of a bevel at the front of the Nose piece. 

44)      It should fit like this. 

45)      Before gluing the Nose piece in place, make sure the hatch can be opened and removed. You may need to trim the tab at the front of the hatch slightly for the hatch to be removed completely.  Once the Nose is glued in place, remove the hatch so it doesn’t get stuck.

46)      Each float consists of 5 Depron parts: Float Top, Float Inside, Float Outside, Float Rear & Float Bottom. 

47)      Preform the Float Inside & Float Outside to match the curves of Float Top. 

48)      Glue the Float Outside to the Float Top. Make sure the side is perpendicular to the top. 

49)      Also, be sure to assemble a Left and a Right float. 

50)      Glue the Float Outside to the float assembly, making sure the side is perpendicular to the top. When the glue joint has dried, bevel the rear edge of Float Top to match the sides. 

51)      Glue the Float Rear to the float assembly. When the glue joint has dried, bevel the edges of the Float Top & Float Rear to match the float sides. 

52)      Use an emery board or a sanding stick to square up the lower edges of the float sides. 

53)      Preform the Float Bottom to match the curve of the float sides. 

54)      Glue the Float Bottom to the float assembly. When the glue joint has dried, bevel the rear edge of the Float Bottom and round the tip of the float assembly. 

55)      Test fit the float assemblies to the bottom of the wing using the tabs for alignment. When satisfied with the fit, glue the float assemblies to the bottom of the wing. 

56)      Prepare the Rudder and Vertical Stab for hinging by beveling the leading edge of the rudder and the trailing edge of the Vertical Stab.

57)      Test fit the Vertical Stab to the wing. Enlarge the slots in the wing if necessary for proper fit. Glue the vertical stab in place. Make sure it is perpendicular to the wing. 

58)      Hinge the rudder to the Vertical Stab. 

59)      Test fit the Ventral Fins to the slots in the bottom of the wing. When satisfied with the fit, glue them in to place. Make sure they are perpendicular to the wing. 

60)      Assemble the wing tips by gluing 2 Tip Floats to each Tip Plate. 

61)      Be sure to assemble a Right and a Left wing tip. 

62)      Test fit the wing tips to the wing. Glue them in place when you are satisfied with the fit. 

63)      Make sure the wing tips are perpendicular to the wing. 

64)      Test fit the elevon control horns to the elevons and measure the required length for the pushrods. Assemble the elevon pushrods to the required length. Fit the pushrods to the servo arm and the control horn then glue the control horn in to place. 

65)      Repeat the previous process for the rudder pushrod. 

66)      You may want to cover the bottom surface of the floats for durability. Iron on film covering can work well for this. Packing tape can be used as well. 

67)      Don’t forget to tape down the elevon servo leads. 

68)      The motor leads may require extensions to reach the ESC through the channel in the pylon. I extended the leads on my motor by about 2 inches .

69)      With a pylon mounted motor, the slightest vibrations can become amplified to destructive levels. It is important to run a correctly balanced propeller. I shortened the shaft on the motor about 1/4 inch to lessen the effect of any propeller vibration. 

70)      The ESC location in the fuselage. 

71)      Install the receiver into the plane and connect the servos and ESC connections to it.


72)      Install a prop (APC 7x5E or 7x6E suggested) on the motor (so the prop is facing the front of the plane) with the prop saver supplied with the completer kit.


73)      Test the motor direction to make sure the propeller is pushing air towards the back. If not, swap any two motor/ESC connectors.


74)      The CG (center of gravity) should be set to the location of the hatch magnet initially.


75)      The recommended control throws are as follows:


Suggested starting throws:

Set your radio to use an elevon or delta mix

Trim the elevons to have a slight bit of up reflex
Aileron 0.4" up & down (0.8" total) 30% expo
Elevator 0.55" up & down (1.1" total) 20% expo

Rudder Full available deflection and 30% expo