The kit and its assembly:
This build followed a spontaneous inspiration, and it became another contribution to the “in the navy” group build at whatifmodlers.com in early 2020. I actually had the Vampire kit already stashed away for a while, and the plan to convert it into a propeller-driven aircraft with a radial engine and a pusher configuration à la Saab 21 had been there – but I lacked an idea for an operator, so that I could build the background story around it. With the “in the navy” theme, it suddenly clicked – why not the IJN? The Vampire is a rather compact and slender aircraft, so there’s IMHO some Japanese “style” in the design, and after the torturous build of HMS Cerberus I wanted some kind of relief.
The Vampire kit is the vintage Heller mold from 1979, but actually in a mid-Nineties Revell re-boxing. Like many other Heller kits, it comes with raised panels, but detail is sufficient (nice dashboard, landing gear is O.K., and the kit comes with separate air brakes) – the molds seem to be a bit worn, though, I guess a “true” old Heller kit is more crisp and would be the better choice.
At the core of the conversion plan was the implantation of a radial engine in place of the jet exhaust. I found a donor part from a Hobby Boss MC.200 Saetta – a bit vintage, but it had the right diameter and I actually liked the ring of bulges on the cowling. Internally, a styrene tube adapter was added for a freely spinning propeller.
While adding a prop to a jet seems to be an easy task, the real challenge behind such a conversion are the many other changes that have to be made to the airframe. This includes a (considerably) longer landing gear and the respective wells, but also the tail surfaces. There’s also the question how the new radial engine actually breathes, where exhausts can be located, and a cooling system is necessary, too.
Work started with the search for new landing gear struts, and I also used different wheels – for instance, the main wheels come from a Hasegawa F9F Panther, while the front wheel comes from a Frog He 162 and is probably 35 years old(!). In order to make the longer struts fit into the airframe, I elongated the wells in the wings towards the fuselage, so that the track width was reduced – but with the Vampire’s small airframe and original wide stance, this was no serious problem. From the inside, they were faired with styrene profile material, and the extended covers were scratched – esp. the parts for the wings, with their bulges for the tail boom tips, were fiddly.
In order to move the overall look a bit further away from the Vampire, I completely changed the fin arrangement. The original, rounded and rather small fins and the bullet-shaped fairings that hold the stabilizer outside of the original exhaust blast were deleted. Once the wings and the tail booms were added to the fuselage, the stabilizer was mounted between the booms, in a slightly lower position. For the new fins I wanted a layout that would, beyond a more squarish shape that would better match the wings, protect the propeller. Therefore, I used stabilizers from a KP Yak-23; each was cut into two pieces, tailored further to match the rest of the aircraft, and glued in positions above and underneath the booms. Looks quite weird, as if the aircraft had been designed upside down, but it’s a rather pragmatic solution that has already been used on some pusher designs in the past.
The six-blade propeller was scratched from a spinner, carved from a thick piece of sprue, plus a metal axis and six single blades that were taken from the rather wacky one-piece propellers of Airfix’s Ki-46 kit.
Hollow steel needles were used as barrels for the Type 99 cannons in the lower fuselage.
