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S300 version of the SIG "Wonder"

For an electric sport builder, This 9oz  "Ewonder" will eat up some sky in a hurry. Built for high performance park flying.  7/16" fiberglass tube spar  and  a multiple stringers for minimal weight. Ply formers with balsa sheet panels. Naro size servo's and micro RX. But, Dual conversion RX and micro or mini servo's can be used if lighter battery's are used. 

Normal AUW at 14oz with 6 cell 600mah nicads. 32.625" ws with 6.75" chord less ailerons. Fuselage length is longer in scale to the SIG. This accommodates for a broader range of electric setups. Like its big brother it has ample room in the fuselage for gear. Unlike it big brother it has higher lift wing. This rib design is very fast but will also fly slow. It will not perform the easy rolls as its glow version but its not intended to. This is an excellent trainer for a rc pilot that has the need for speed. With your experience flying the Ewonder you'll be ready for Next step in aerobatics. Very quick build up and straight forward techniques that anyone can accomplish.   

planform and template's download


Modified Clark Y foil shape. A big difference than the SIG Wonder. This foil shape works well for the S300  version. Light wing loading is the secret to the ewonder, You dont have to have a giant sky to fly.  Ewonder can be flown in a park or 200' x 200' sq' area with the pace of the full size version.

Trace out the ribs on the balsa sheet. Cut out and slide on the fiberglass tube spar. Squeeze the ribs together and file the stringer spar locations parallel with the tube at locations from the specs. 






Space out the 12 ribs  starting 3" from the tips on your table and insert the stringers and the TE and the LE and glue up. Cut out wing tips and glue. Sand and cut servo hole. 

Picture's below show steps of construction

For the two inside ribs, Cut 1/16" smaller in size. Use 1/16" sheeting to cover the middle of the wing. Glue and cut hole for servo. Cut hole in bottom of this section for lead approx 1" from TE. 

This first pic below shows ribs and spar and stringers all together. There is no glue yet. 

Layout TE  and LE and attach.


Clamp wing tips and glue


Sand down to a nice shape.


The Fuselage

Measure out the side panels and cut. Draw all formers on ply and cut out. Sand formers to match and layout and pin to rite panel.




A floor can be installed in fuse. On the left of the fuse the .250" x .750" stick will span F3 thru F6. 


Measure, Cut and glue the three bottom sheet's 




Attach braces to F7 and F8. These will  be what tail feathers are bolted to.



Attach braces to F2 and two to both sides of F3. These are for the motor cover and front wing hold down. 







Tail Section




Start the fitting of the wing and the tail section