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Slipher-Wing


Cut the ribs free from the sheet and stack them together. Carefully sand the holding notches flat.

Prepare the spars. Sand the holding notches flat, but do not remove the real 'tabs' which will be used to build a staight wing. Use a small sanding tool to square up the corners of the 3mm ply and 3mm balsa main spar.

This how the slots look before sanding the corners.

And this is after making them squeare.

Locate the root-rib doublers

Glue the center-ribs together, notice the slot for the dowel.

Then glue the doublers left and right of the center rib


carefully slide the wing ribs in the 3mm ply and 3mm balsa spar. Small force is fine but if you feel that the fit is to tight, use the sanding tool again the make the slots a bit wider. Do not Glue yet.

insert the rear balsa spar. Notches point to the bottom of the wing. Glue the 10x3mm top spar to the ribs and main spar.

testfit the false leading edge. When fit is correct, use some CA on each rib to fix. Carefully slide the trailing edge into the slots of the ribs. Take your time. It helps to sand a small bevel on the 'points' of the trailing edge.

Create 2 sheets of 2mm balsa with size 250mm x 950mm. Each sheet is build up from two full sheets of balsa and the strip that is left over from the balsa sheet that contains the wing ribs.

Carefully sand the leading edge in shape with the ribs. Draw a line in the middle of the 10mm top spar, Cut a strip from the balsa sheet that will be used to cover the top-front of the wing. The sheet will go from the middle of the spar to the front.

Carefully sand the read part of the wing, Then use the remaining of the sheet to cover the rear of the wing. use a lot of weight and/or pins to press together.

When the top of the wing is dry, clean the building board and turn the wing upside down. Place a 10mm x 5mm strip under the trailing edge and place weights on the reat of the wing.

Remove the building tabs on the bottom of the ribs and sand flush.

Sand the leading edge flush with the ribs. Cover the front of the wing. Again from the middle of the 10x3mm spar.

Next steps needs to be performed before the bottom sheeting is glued. - But the servo wire in place - Decide where the servo will be placed - glue the aileron horn support in place. (half-moon parts) ALSO: Note the DOT on the sheeting, this will indicate where the cable is located and the servo will be placed.

Drill the hole for the wing-bold

Use a thin drill bit and drill from the bottom of the wing on the inside of each aileron corner. This mark will be used later to mark the aileron outline and cut the ailerons free

Mark the inside of the aileron. Then carefully sand the ribs so they end up on the 1mm ply trailing edge. Then glue the bottom sheeting.

This is how the trailing edge will look before sanding. You will need to send the top and bottom sheeting so the 1mm trailing edge will just shine trough. Use a long straight sanding block with medium grid sanding paper.

The traling edge after sanding the sheeting.

Sand the sheeting flat against the false leading edge.

Then glue a strip of 2mm balsa, when dry sand the leading edge in shape.

Glue 3 tipblocks together

Then glue to each wing tip

Sand the tipblock flush with the wing, rounding the tips will be done just before covering to avoid dents.

Servo frame to be fit into the wing. HS65 or Savox 0254 works great.

Servo hatch that falls nice into the servo bay. If needed dril the holes in the servo frame using the hatch as guide.

Using the DOT as marker, cut a small hole in the sheeting and then work to the front of te wing until you find the second spar. Then work left and right until you find the ribs.Then use the servo frame as guide to cut the sheeting so the servo frame will fit.

Fit servo box flush with the wing-skin. You might need to sand a bit from the 'legs' of the servo frame.

Test fit…. all fits well.

Use the holes on top of the wing (that indicate the ailerons) and use the drill bit to push trough to the bottom, then mark the ailerons outline.


Rough indication measured from the tip. If you look closely, you will see the marker hole just under the 13.

Aileron is 3 ribs wide, again marker holes show the inside of the ribs

draw the cutting line of the aileron 2mm inside of the box from the previous pictures

Hardest part is to cut trough the 1mm ply trailing edge. Use a sharp saw and take your time. Cut from both sides of the wing.

Use a fresh blade and cut the balsa length wise.

Use the saw again to cut trough the two ribs.

This should be the result. Free aileron, the 'half-moon' part is visable.

This is the wing after cutting out the aileron. Now use a sanding blok to sand the hingline flush with the balsa spar. Also sand the sides flush with the ribs.

This is the wing after sanding the box flush with the ribs and the hingeline

The aileron is now to small, we will box the aileron with 2mm scrap balsa.

The aileron with the 2mm balsa frame before sanding. In this case the gap for the left aileron was a bit to big so I added an extra 2mm strip.

Boxed aileron before sanding

Place the servo hatch in the frame and draw a line trough the middle of the hole and mark it on the aileron.

Use the 0.5mm gfk reinforcement to mark the slot.

Use the 0.5mm gfk reinforcement to mark the slot.

Drill a 1.5mm hole on the begin and end of the marked slot. Be carefull there is some 1mm ply at the rear of the slot.

Testfit the aileron horn. Due NOT glue yet.

When using covering hinges, you can proceed. My approach is to cover the bottom of the aileron first. Make sure you have sufficient covering left on the side of the hingeline

Then place the top of the aileron on top of the wing, the loose covering wil now fall in place on the hingeline of the wing. Use your covering iron to stick the covering in place. Make sure that the covering material is glued straight and tight where the actual hinge will appear.

Fold the aileron in place, use some small strips (or one long strip) to finish the hinges. The covering from the bottom should touch the covering on top so it will stick together. This creates a good hinge.

aileron hinged nicely without any airgap.