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Summary of Contents for J&H Not Just Another Pretty Face P-30
- Page 1 NJAPF Not Just Another Pretty Face P-30 Endurance model J&H Aerospace www.jhaerospace.com Al Lidberg’s legendary P-30, optimized for laser cut precision assembly...
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Page 2: Building Instructions
NJAPF P-30 J&H Aerospace Building Instructions Congratulations on your purchase of the Not Just Another Pretty Face! You are about to build a high performance rubber model capable of competitive, long flights. This is a full kit containing all parts necessary for rigging a fuse dethermalizer equipped competition model. - Page 3 Building the NJAPF You will need a large, flat surface to build your model successfully. We recommend a large piece of foam or a suspended ceiling tile, as these surfaces readily receive pins required to hold the components down during assembly. Before beginning construction, be sure to acquire the materials and tools necessary to complete your model.
- Page 4 Lay parchment paper over you plans to avoid getting components stuck to the plans. Begin building by laying out the fuselage sides as shown over the plans. For best results, build the second fuselage right over the first. This method will require you to separate the sides later using a razor blade, but it provides virtually identical fuselage sides.
- Page 7 Once you have completed the fuselage sides, assemble the fuselage jig as shown. This device will allow you to easily jig the sides together into a straight fuselage. Carefully separate the fuselage sides. Slide the fuselage sides into the jig and begin adding cross pieces to join them together as shown.
- Page 10 Carefully remove the fuselage from the jig. You may have to slit some of the jig formers to slide the fuselage completely out. Add the rear fuselage decking on the top of the fuselage to provide a mounting surface for the fin. Assemble the wing pylon sides as shown.
- Page 11 It is now time to begin building the wing. The wing is built in one piece and then cracked at the centerline to add dihedral. Once the dihedral is set, the 1/16” sq top spars and plywood joiners can be added. After they are firmly attached, remove the wing from the building board and add the 1/16”...
- Page 12 Crack the wing to the specified dihedral angle (we left one side pinned down for dihedral setting and so doubled the dihedral amount for a single side support to retain the correct dihedral angle). Install the top 1/16” sq wing spars, being careful to avoid filling the extra space in the center section slots that is reserved for the plywood wing joiners.
- Page 13 Remove the wing from the building board and install the bottom 1/16” sq spar, again being careful to leave room for the plywood joiner. Locate the plywood wing joiners and glue them in place. Install the tip finishing ribs. Add the shear webs to your wing as shown.
- Page 14 Once you have finished joining the wing structure, sand off any burrs and be sure to profile the leading and trailing edges to match the airfoil.
- Page 15 Assemble the stab over the plans as shown. You may wish to sand the leading and trailing edges prior to assembly. Leave off the tip ribs until the spars are in place. Install the top spar. Install the bottom spar and the center rib gussets.
- Page 16 Install the tip rib plates. Add the shear webs to the horizontal stab. Sand the leading and trailing edges of the stab to an appropriate profile and sand off any rough edges.
- Page 17 Add the 1/16” sq bottom rails to the fin as shown on the plans. You can bevel them to a triangular cross section or just leave them square. Round off the edges of the fin, except on the bottom. Wait until after covering to attach the fin to the fuselage.
- Page 18 The structure for your NJAPF is now complete. Give the entire structure two coats of nitrate dope in preparation for covering. We chose to use polyspan to cover the fuselage, which required the use of Sig Stix It to provide a good heat activated bond.
- Page 19 Set the stab in place with the leading edge support under it and mark the proper location for the leading edge support before gluing it in place. Make sure that the support allows you to, at minimum, have the stab level with the top of the fuselage and preferably has the right side slightly higher than the left.
- Page 20 Install the vertical tail in front of the fin, making sure it is parallel to the fuselage center section.
- Page 22 The plans for this model show how to install a snuffer tube in the tail and the necessary hooks (stab trailing edge, stab center, and bottom of fuselage) for a fuse operated pop-up stab DT similar to the system below: In areas where fire is a severe risk, it may be desirable to use a viscous damper system such as the one shown below using the dampers available at jhaerospace.com...
- Page 24 Drill the nose block as needed for a few degrees of down and right thrust and install the prop shaft and propeller. You can create a freewheeling bail using the techniques in the Technical Library at freeflight.org or you can just bend the end of the shaft over at 90 degrees like we did.
- Page 26 Cut a piece of 1/8” aluminum tubing to size as shown. It should be generous enough in length that if it slides to one side or the other a quarter inch or so, it doesn’t fall free.
- Page 27 You can flare the ends of a length of ¼” aluminum tubing slightly shorter than the inner width of the fuselage to make a sleeve for the rear peg. A braided motor of 4 strands of 1/8” rubber will give you a solid climb and a very long motor run with the supplied propeller.
- Page 28 Install the rubber motor in the fuselage, and wind the motor up about 50 turns before allowing it to unwind and tension itself from the braiding. Assemble the wing mount over its diagram using 0.040” carbon rods or 1/16” aluminum tubing as the crossbars. Rubber band the wing onto the wing mount.
- Page 29 With the model fully assembled, rubber motor installed and tensioned, propeller in place, etc., locate the wing on its pylon so that the model balances at the location described on the plans or at a location you determine to be optimal for your flying style (consider the location shown on the plans to be the forward CG limit, as we have found that a surprising amount of incidence is required at this CG location).
- Page 30 Congratulations, your NJAPF is now finished. Weigh it to verify that the completed airframe is at least 40g after balancing with clay or lead to achieve the correct CG shown on the plans. For contest flying, 4 strands (two loops) of 1/8”...
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