P-35 page 2

Part 2

SURFACE PREPARATION:

Now things start to get busy. The general layout of the HUGE raised panel lines was inaccurate. The entire model was sanded smooth and polished to a shine. Note from before, this must be done before any assembly as the parts will be handled very roughly! The fuse halves, wing panels, and tail surfaces were laid on my scanner and reproduced at one-to-one so I could carefully mark and layout all panel and rivet lines. Using many different photos from all possible angles I was able to map out the entire structure of the plane and derive the rivet patterns. First, panel lines were marked in soft pencil, masked with thin strips of DYMO LABEL tape, and scribed. Panel lines (and rivet lines) were not allowed to contact any edges as perfect alignment/continuation could not be guaranteed. After gluing halves, panel lines are “connected”, and rivets “continued” through seams.

Next, rivets “bumps” were pressed into the surface using pounce wheels, or freehand pin in tight spots. Again with the rivets, to keep lines straight they were masked with DYMO tape. At this point, the fine “wrinkles and dimples” that appear in an aluminum skin aircraft were applied. Using photos, the specific P-35 wrinkles & dents were mapped out, and scraped in along specific rivet lines with a #15 scalpel blade. The rough scrapes were finely smoothed with 600, then 1500 grit, and polished with old style Crest toothpaste to eliminate ALL scratches. This process eliminated many rivets, which were re-applied as needed. The fabric tail surfaces were given a light “dimpling” between stitch lines with the scalpel and sanded/polished. The cowl halves were sawed off at the aft cowl flap line and set aside. Two cavity vents on each side were back-scraped to thin the plastic (it is very thick here!) and cleaned up for a more crisp appearance. Now attentions was turned to the control surfaces. The hinges on the P-35 showed daylight through so each was drilled and jewelers filed appropriately. The hinge lines themselves are weak recessed lines that will not look good even with a wash applied. Using the various scribing tools and back edges of scalpels, the hinges were scraped and opened up to leave a rounded control surface and a deep recessed hinge gap. This looks much more 3-D and eliminates the need for washes. Also, the sides of the ailerons were opened up and trim tabs made “free”. At this point the cockpit side wall details were installed and detailed (see “cockpit” above).

LIGHTS:

Now, I wanted this model to have some “special” thing and operational navigation lights seemed to be the right answer. After much research, the only viable method was to use light emitting diodes rigged in parallel on a 12v garage door opener battery. Needing red, green, and white seemed easy, but white LED’s are hard to find….and expensive. Tests showed that the red and green LED’s were not bright enough to show through the lens, so the extremely bright, white LED’s were used throughout. The peculiar nav light setup on the P-35 has teardrop shaped lenses on upper/lower and left/right surfaces. Each location uses a single LED, filed down to minimum thickness, and epoxied in place next to the nav light. Each nav light “pair” has a “lens”, actually a rod, of the required color that passes through the tail/wingtip, and is shaped and polished on the end. When the white LED is lighted, the light shines up and down through each “lens”, and generates almost zero heat…without a bulb filament to burn out. Due to clearances, even at min thickness, the LED’s did not fit, so each wingtip/tail had to be internally ground down until light showed through the plastic to make room for the LED. Each LED was color checked (they do vary a bit) and matched to a position, wires soldered on, and tacked in place with a dab of medium CA. All part were mated and clearance checked. When satisfactory, the thin mounting areas were reinforced with 5-minute epoxy.

WING OUTER PANELS:

Drilling out nav light lens holes, and allowing for wire runs into center section prepped outer wing panels. The lower aileron has external Friese hinges and the molded “lumps” are a poor replication. Each hinge was drilled out and a small slot left. Pairs of matching left and right hinges (the three on each aileron are different) were filed from thing brass stock and JB Weld epoxied into place. The excess brass/epoxy protruding into the inner wing was ground off with a Dremel cutting wheel, and a small dot of JBW applied to the hinge points to simulate pivot bolts and nut.

WING CENTER SECTION:

The center section of the wing is a major structural piece on this model as it ties several sub assemblies together and sets the alignment of the entire model. The main wheel bays are barren and I detailed them by adding styrene strips/rivets to the inner surface of the upper center section. To make bay walls, I formed blobs of bakable clay into each half, carefully removed it, and baked it to harden. These clay pieces were closely formed and when hard baked, epoxied in nicely to fill in the center wing structure and provide a firm mounting point for the improved landing gear. As it turned out when fitting the main struts, the mounting holes were 3 mm too far aft and had to be re-drilled forward. Fortunately the baked clay allowed a strong structure to work with….whew!! Holes were allowed for running the nav light wires through to an exit point in the center of the wing below the front firewall. The clay also allowed me to use a small tipped Dremel grinding ball to bore out and shape the ram air inlet on the right wing leading edge which is not molded into the kit.

ENGINE COWL:

The engine cowl halves were glued together and the cheesy cowl flaps (just outlined with a thick raised panel line) were cut out. Engine fit was checked and mounting hardware fashioned. The cowl must be removable for battery access, yet tight enough that it does not look like it is “hanging on”. By using two tight fitting concentric brass tubes glued together and parallel, I made a self-aligning mounting post to slip the cowl on and off. The inner brass tubes are just pegs that connect the outer pairs, which are securely glued to the fuselage or upper cowl. These needed to be very tightly fitted as the gun exit troughs needed t be ground/filed/sanded on each side of the mounts. New cowl flaps were made from .010 and .005 sheet styrene with individual linkages behind each door. Exhaust pipes were drilled out and replaced with thin walled brass for a crisp look. Engine fit was adjusted and panel lines/rivets were applied to the cowl, making sure patterns aligned with the fuselage. Cowl fit was adjusted to ensure mating seam was minimal and would fade into surface like a panel line. The forward exposed gun barrels were made at this time and exit trough alignment checked. Thin wall brass tube was glued into the cowl to neatly accept the gun barrels during final assembly. The somewhat complex rivet patterns on the cowl were pin-stick applied. The larger cowl fasteners were made with a pin vise and small bit by just “starting” the bit to make a small circular divot that has relief and is larger than a rivet.

PROPELLER AND HUB:

This kit has a nice prop design, but the molds left huge dimples and sinks in each blade. The hub has the basic shapes correct but the long, stretched up pillars simulating the fly-weights look terrible. The massive pillars were cut off clean down to the hub, and a small groove etched in. Scrap brass fret and styrene rod was used to make good looking fly-weights. The sink holes in the blades were filled in with medium CA and shaved with a scalpel, sanded with 600/1500 repeatedly until corrected. A thin aluminum tube ring was made to give the hub actuator a more 3-d look. Brass tube of the same size as the engine core piece was used to make a bushing which was fitted into the rear of the hub assembly to accept the steel music wire prop shaft without damaging the plastic hub assembly. The blades were attached on a jig for alignment and orienting in one planed of rotation. The entire assembly was polished with Crest and washed, painted with a nice “wet” finish of gloss black Model Master enamel, and set aside to cure for 5 days. The hub was finished with chrome ALCLAD II and the blades polished aluminum ALCLAD II. Decals went on nicely and the whole unit was final coated with Tamiya X-22 clear acrylic.

CANOPY:

The clear canopy parts on this model are nice. They are packaged in a separate bag and were in good condition. Their fit is excellent and little sanding or rework was required. I cleaned up the pieces, scraped and pre-fit them, and dipped them in Future. Using a pin-stick, rivets were applied as required on the inner surfaces of each piece. Thin strips of Bare Metal Foil were applied and burnished on the inner surfaces. With the pin-stick again, rivets were applied to the outside and “matched” to each rivet on the inner surface. No foil was applied as this would be done in final outer covering. Points where the pieces would touch the fuselage and mate with glue were checked free of any foil. For the sliding canopy portion, two pieces of scrap fret were used to make the skirt which covers the canopy rail, and thin wire used to make the left side canopy outer latch handle.

On to the Final Part

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