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OA Composites NRJ, Assembly And Settings Manual

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OA Composites NRJ Assembly And Settings Manual Download Page 14

 

Use a drop of CA to attach the other end of the wire to a long thin control rod that you’ll then slide in through the 

fuselage up to the front. Hook up the line to the servo horn using a small part of 0.5 or 0.8mm control rod, to avoid 

friction and allow for easy unmounting. No knots or glue on the servo horns! This is bad for a clean command. 

The length of this piece must be define according to the servo travel, and the free place between the servos. 

 

 

 

 

 

Summary of Contents for NRJ

Page 1: ...place in the fuselage Small thickness variations in the fuselage are expected and as such it is necessary to lightly sand the tray for a perfect mating The tray should maintain accurate dimensions in the corners and along the length of its contact with the fuselage It should also let servo wires through freely Run multiple dry fittings and check that the external nose cone slides without forcing o...

Page 2: ...To leave the possibility of ballasting the glider correctly a distance of around 23 mm between the end of the tray and the central lip of the fuselage opening is necessary ...

Page 3: ...perties from the long curing fuselage epoxy allow an easier removal of the servo tray if required Glue with 4 mating points on the top and bottom sides of the tray Be careful to not fill in the cable channels of the tray with glue meant to allow the servo wires to reach the nose ...

Page 4: ...glue a little piece of 4x4mm pine wood under the D47 leg to have the right horn s height position D47 works in 1S but it s better to supply it with a 5 to 6 V voltage booster Ailerons servos and linkage system mounting Mount the ailerons servos close to the wing and the tails servos on the front of the tray Ailerons linkages must be as short as possible Here sleeves are only dry mounted to check t...

Page 5: ...Be careful to keep the installation of horns symmetric and respect the given distances for the best range of motion Cut a notch of 1 5 mm wide and 25 mm long on the side of aileron root as close as possible to the hinge Put a tiny drop of oil on the Kevlar hinge to prevent CA to enter in it Glue your horn precisely with CA adding a 25mm joint between aileron and horn on the bottom side of aileron ...

Page 6: ...ratings for perfect range and precision At neutral the aileron horn servos must be 20 30 backward tilted to the ailerons direction to fit the servos and ailerons linear ranges better In total 9mm of linear range must be managed on both aileron and servo horns Notice that we must choose the shortest servo horn possible to prevent any instance of flutter which damages servos over time caused by the ...

Page 7: ...iffer for your installation so do not take this image as a reference for length After the aileron bends are prepared mark with a pen about 1 5 mm before the horn hole Again aileron is secured at neutral and servo at neutral with the definitive tilt The difficulty is to bend the rod at the right length take your time and calculate your gesture Put your pliers just over the pen mark edge to edge the...

Page 8: ...be adjusted by cutting even if the extremities of the linkage are done For an optimal strength of the linkage be sure to follow instructions for both inner and outer glue joints as intermediate mechanical reference points The greater the length between the points horns anchorages and fuselage reference the more likely the control rods will bow and allow flex in the linkage And allow flutter to hap...

Page 9: ...inal elevator horn s height should be trimmed down to 10 5mm before being glued to avoid hitting against the tail boom For even motion the wire must be perpendicular to the hinge with the elevator at the neutral position Rudder The servo control range is 4 5mm Rudder control s maximum motion range suggested of 14 mm Using the same servo horn as for the elevator servo will yield a very rigid contro...

Page 10: ...ss in launch constraints Rudder installation For a right handed pilot the peg installs at the tip of the left wing The rudder has an asymmetrical profile and in the case of a right handed pilot the top domed surface must face towards the peg The horn must be glued on the opposite flatter side For a left handed pilot as the rudder is symmetrical just mirror the installation by putting the peg on th...

Page 11: ...le of the stab pod slot Glue the horn in position with medium CA and be careful to maintain the horn s hole above the hinge line when the control is at neutral to guarantee a symmetrical motion for the servo Tail feather springs Using the provided 0 3mm steel rods bend them in a U with 55 mm in the middle section and 25mm long tails on each end with 90 degrees bends The bends should be separated b...

Page 12: ...he fitted section of the boom on the rudder or earlier near the elevator s mount on the side In this last case Use a 1 5mm drill bit and make the hole oval by angling the bit to avoid any kind of friction of the cable against the fuselage Prefer to drill it in the pod length 5mm behind the pod s leading edge and not in the boom itself You can secure the hole with thin CA and pass the bit it again ...

Page 13: ...a little hook in a 0 3mm rod In the case of a fishing braid use you can make a small hook with a 0 3mm rod to attach the wire in a permanent fashion on it This prevents from any wire cutting by friction on the sharpened carbon control horns It has often happened in DLG history ...

Page 14: ...age up to the front Hook up the line to the servo horn using a small part of 0 5 or 0 8mm control rod to avoid friction and allow for easy unmounting No knots or glue on the servo horns This is bad for a clean command The length of this piece must be define according to the servo travel and the free place between the servos ...

Page 15: ... on the control surface and the spring should take out the 2mm slop built in when taping down the control surface In general your control surface should now be perfectly neutral The external top side of the servos horns might need to be sanded to let the nose cone get properly seated ...

Page 16: ...age is generally standard but opening it up a little bit with the trailing edge to the outside means it will slip away from the finger tips at the end of the launch easier Recommended range is from 2 to 5 degrees from parallel with the fuselage towards the outside This angle is obviously set when cutting the peg s slot through the wingtip Drill an undercut of the peg s cross section through the wi...

Page 17: ...d inducing aileron or rudder trims during launch or flight which is undesirable After having determined the needed weight to balance the wing usually 1 5 to 2g lower the outer aileron and in the hinge s opening wing core create a pocket for your lead to fit in without impeding the aileron s motion gluing the weight in place with CA or epoxy Grease slightly the Kevlar hinge before ...

Page 18: ...Gap sealing hinges of the control surfaces In order to minimize drag as much as possible it is advised to gap seal the hinges of all control surfaces In flight any audible whistling sound means there is some more drag that can be eliminated Take clear or kapton tape about 1cm wide and put it down with half of the width on the edge of a perfectly clean support Apply white or black powder talcum pow...

Page 19: ... no need for more the dihedral is very helpful Some advices about the flight performance The NRJ has special gliding characteristics being able to fly really fast with a good drag in flat foil configuration But while this is really amazing you might forget about the consequent sink rate of this flight mode This is only suitable for quick transitions or returns from downwind explorations with high ...

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