The full size SZD-30 Pirat is a single-seat multipurpose glider aircraft from the Polish firm PZL Bielsko which first flew in 1966, and started production in 1967.
This RC scale version of the SZD-30 Pirat is 3.2 metre wingspan or 21% scale.
Wing area: 62sq/dm, 960 sq ins
CoG: 76 to 80mm from leading edge
Servos: 2x Aileron min 5kg, 1x Elevator min 2.2kg, 1x Rudder 4kg, 2x Airbrake 2.2 kg, Tow Release 4kg (based on deflection at 70kph)
This kit includes:
*Fuselage – CNC Foam cores ready for 2mm balsa planking. $50
*Wings –Built up, kit includes ribs, leading and trailing edges, main spars and shear webs. $60
EPS foam version cores, jackets and end ribs $50
*Tailplane – EPS foam core ready to be laminated with 1.0mm balsa– $10
*Fin – EPS foam core ready to be laminated with 1.5mm balsa $10
*3d Printed canopy frame $10
*PVC Clear Canopy $10
*12mmx10mm Ali Joiner Bar $5
This kit does not contain electric/electronic components, balsa planking, wing skins, covering or glue.
Planning the fuselage construction:
- Glue the fronts and backs shells together using Titebond Original, PVA or 5min Epoxy. Leave overnight if possible...Care should be taken to ensure the pieces are aligned. The top of the fuselage should be a straight line. Use pins at an angle across the join to hold the parts inplace.
- Planking is best started with Fuz half shell flat on the bench. Start planking using 10mm wide 2mm thick balsa strip down the middle.(King Plank). As you work out from the middle the strips should get thinner. Maybe down to about 5mm toward the bottom and the top. Each plank needs to be sanded to shape and the bottom edge of the strip is slightly sanded to ensure no gaps are formed. Put pins at opposing angles every appox. 60mm. That should hold the balsa planks inplace until the glue dries.
- Once the fuselage is planked then you need to cut in the wing and bottom keels. Start by tracing around the ply and then either with a router or knive make a 3mm recess.
- Glue the ply plates inplace both side.
- Good time to make the wing joiner box using good quality wood glue not CA
Start by gluing the leading edge and ribs onto the 2mm balsa middle silhouette.
Now turnover and do the other side
The tabs are removed and the 1/8" tube is tacked in place with CA.
Next the 6mm balsa false leading edge is glued in place.
Round off the false leading edge, sand all the edges flush
The 3mm balsa hinge tube support is then glued on the front with tabs in place.
The top drag spars (3x3 and 8x3) can now be glued in place......
Glue a 3mm balsa false leading edge to the 1.5mm leading edge. This give a better glue join to the 1.5mm balsa sheeting.
The top sheeting, I used 1.5mm by 100mm starting trailing drag spar and finishing half way on main spar.
Once the top is sheeted you can break the wing off the plan. Knock/Cut off the rib tabs, sand the false leading edge and lightly sand the underneath to ensure all parts are flush.
Foam Tail :0.75mm balsa skins pressed on to the eps foam cores with epoxy. Carbon strips are optional
Note the centre section has a combination of end grain/balsa 3mm ply and end grain balsa.