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Causemann Slingshot RG20/900 DLG, Build Instructions, Page: 7 / 16

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Causemann Slingshot RG20/900 DLG Build Instructions Download Page 7

Page 

7

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16

 

 

 

Decide the location for your receiver and servos. I wanted to plug the battery directly into 

the receiver to avoid the need for an extra plug / socket and on off switch (you’ll need a 

special charging lead). Remember to program your radio and centre the servos so they 90 

degrees to the servo body before installing. 

Summary of Contents for Slingshot RG20/900 DLG

Page 1: ... experience 2 General Design Layout and Target Weight The EPP Wing kit includes a sheet of 2mm balsa for the 2 ailerons 43mm at root and 23mm at tip plus the fixed centre section that will be used to secure the wing trailing edge to the fuselage A target weight to aim for based on the out of the box weights Out of the box weights Grams EPP Wing Core L 30 3 EPP Fuselage 4 6 Fin 3mm Depron 1 5 Balsa...

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Page 3: ... You may need to trim a little off the trailing edge to get a clean sharp edge that s a little thicker than the 2mm ailerons I removed a little after covering the bottom with film so there was a straight edge for the ailerons and then added the top film Start by rounding off the wing tips using sandpaper A 30mm diameter is a good guide Make sure both wings are the same Make up a small peg eg carbo...

Page 4: ...ing edge at the root and 30mm at the tip looks about right and create a smooth bow curve Tape the spar in position and mark each side with a fine marker pen I used a Dremel cut off wheel to cut a slot no more than 2mm deep between the lines Use a small stick to hold the wheel shaft off the wing surface to keep a check on the cut depth Cut off the excess length of carbon rod which you can use for s...

Page 5: ...balsa with grain in opposite directions like plywood then profiled to the wing section See picture below of the underside of the wing This is glued to the EPP wing and will locate on the fuselage just in front of the fin You will need to the cut back the wing saddle on the EPP fuselage to suit This gives positive a location between the wing and fuselage as well as stiffen up the rear considerably ...

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Page 7: ...s I wanted to plug the battery directly into the receiver to avoid the need for an extra plug socket and on off switch you ll need a special charging lead Remember to program your radio and centre the servos so they 90 degrees to the servo body before installing ...

Page 8: ...for a top tape hinge Now you should be ready to cover with film I am using 32micron laminating film I added a wide black strip to the lower surface and some red to the upper wing tips so I can see which way it s up in flight Push the servo horns out of the way below the surface and cover with laminating film with a warm hot iron Bottom first with large overlap followed by the top surface with litt...

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Page 10: ...p can be attached to the EPP fuselage either below as I did or above between the wing and fuselage You may need to a cut a slot in the EPP fuselage to avoid the carbon being bent if it does it will bend the EPP fuselage Note The carbon strip extends so it can be glued to the fuselage bottom surface ...

Page 11: ...e 6 Fuselage It s time for a trail balance to see where the Centre of Gravity is and how much ballast is needed in the nose I am using the 75 micron film I have that is strong so I have used that as most of the area is forward of the Centre of Gravity The battery I have which is a 1S LiPo 650mAh round battery 13g in weight and 12mm diameter so it fits just right I have left space for some lead bal...

Page 12: ...can out the sides back the same way Cut the core of the EPP out so you are left with the 2 sides that can be glued back in Wire up the battery and check it all works before using Gorilla glue to put the 2 sides back where they came from Glue 2 lengths of the left over 3mm carbon strip either side of the fuselage for rigidity and hold down with fibre tape ...

Page 13: ...nally cover top and bottom with fibre tape for added strength Add some colour and apply the laminating film I have extended the 75 micron film down to the tail Once covered glue the wing to the fuselage and it s ready ...

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Page 15: ...field slope Start with 20mm C of G and lots of up trim to get a glide and then work back As the balance moves back the elevator pitch becomes more sensitive so dial down the rate As this is my lightweight build I pushed the C of G back to 30mm with 10g of lead ballast giving a final 120g flying weight I may find it a more relaxing flight to move it back to 25mm Aileron Throws midway 35mm width Whe...

Page 16: ... little loss of height Picks up speed and lift well Easy large small loops Ten out of ten design Excellent DLG launch performance and a lot tougher than a pure foam ready to fly On the slope you can throw it well out into wind away from the slope into some good lift The 32 micron film doesn t stick that well to EPP has little rigidity so the wing flexes under it It works OK on the Depron tail so I...

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