Building Extra Sports 30, cont'ed

Back to step #3, the wing protection plywood was ready now. Drill two 4mm holes for the wing screws.

Fit test: The wing fit nicely after been secured .


Cowling installation step #14

With the help of the transparent dummy cowling supplied, simply cut the dummy cowling to fit the engine and exhaust pipe, then slide onto the actual cowling and use as template to mark the openings required for final cutting.

The pic above shows that the cowling was roughly cut for the openings of carburator, cylinder head, muffler outlet and needle valve.

The rough edges can be smoothen either by sandpaper or grinding stone. Here I used grinding stone for easy and quick job


I skipped the installation of fuel tank, throttle linkage, rudder and elevator linkage. Note, I used a bigger 260cc fuel tank from Dubro for GS40 engine

Also skipped cockpit, canopy and pilot installation


Cowling,prop,spinner and muffler installed

Control throws step #22.

For this moment, I followed the throws as per the manual instruction. I will adjust during test flight later

ELEVATOR: 20MM/20MM = UP/DOWN

RUDDER: 25MM/25MM =LEFT/RIGHT

AILERON: 10MM/10MM = UP/DOWN

CG step #23

The manual instruction recommended the ideal CG position is 80mm(3.15 in) behind the leading edge measured at where the wing meets the fuselage. I found this Extra sports 30 to be too nose heavy, may be because of the big muffler and Super Tigre GS40 Ring engine. So I position the battery and the receiver further back but it won't help. Lastly I added some weights at the tail. I hope this building steps can be used for reference, please do some comments if I did mistakes.


That's the end of building an Extra 300 Sports 30.


I will try to post the maiden flight report, flight characteristics, fine tuning etc., insya Allah.