From the archives: FMA Ae. MB2 Bombi cropduster version - 1/72 Luis Santos o.o.p. vac

 (Note: this article is from the archives, the model was built in 2009)

This modeling endeavor is the result of a gift: this 1/72 Ae. M.B.2 vac kit was sent to me by fellow modeler Luis Santos, who produced the parts time ago as a “divertimento”.

The moldings were simple, just the basic shapes, in a way a bit like an Execuform product. The exterior and interior detail to be added. No doubt the arcane subject made my eyebrows raise, being a plane designed and built in Argentina in the 30's. The prototype was designed as a light bomber, but eventually found another, more peaceful uses as a transport and even as a crop-duster, which is the subject of this article.

The lines of the plane were simple and probably the most remarkable features of the design were the high-aspect ratio of the wing and its generous size. A limited number of machines that explored some variations on the theme were produced, with minor changes in the landing gear, window arrangement, rudder shape, wing-to-fuselage fairings, fuselage covering and the fuselage top. The lines and proportions were, as said, simple but somehow pleasant. The design didn’t live long, but surely provided with some experience to designers, builders and pilots.

After separating the parts I dealt with the areas that needed either filling or sanding. Based on references I added surface detail. A master was made for the canopy and a clear vac molded on and a cockpit was scratch-built. Once the fuselage was closed the dorsal area of the fuselage was modified (it was chopped-down as per the military version in the vac provided). Building proceeded to a point where I really needed to have a look at the photos of the crop-dusting version I was aiming for. In spite of the help of a few friends the images didn’t surface, so I half-guessed, based on written accounts, that area. I glued the involved parts sparingly, so if at certain point I can actually see some photos, I’ll be able to address the possible changes. Some external details were scratched, like a wind-driven generator on the left wing, the carburetor intake, engine exhausts, Pitot –under the left wing-, Venturi –left side of the cockpit, oil cooler and navigation and landing lights. The latter equipped with MV lenses. Aeroclub aftermarket parts were used for the engine and the wheels. I painted the model as per its production companions, light grey, but no markings were added, again, waiting for photos to appear. One of the references states that three machines were adapted for cropdusting with two drums containing the product inside the fuselage.

With a bit of work I have now the clunky but rather charming shape of this model boasting its old refrigerator-like lines.

Thanks to Luis Santos and the long list of fellow modelers that intended to help with the particular cropdusting version.

Civilizing a Caproni Ca.101 - modified Fly 1/72nd injected plastic + resin kit

 

Here a link to I-ABCQ:

https://www.airhistory.net/photo/318724/I-ABCQ

(NOTE: some source states that some versions had a slightly different span and length, I have been trying to ascertain this, and, for example: "Aeroplani Caproni dal 1908 al 1935 - Caproni G." does not state a  different span, nor does "Italian Civil and Military Aircraft". There was a difference in length, though, as the nose changed to accommodate other power plants.

Addenda: Aeroplani Caproni, written by Abate - Alegi - Apostolo, states span differences between the 101-less span, 101 bis and C -same span- and E -more span (thanks Fabrizio!) The kit's span is in the general ballpark of the bis and C types.

When the Caproni Ca.101 appeared in the market released by Fly, I acquired one, even if it wasn't the civil version I was hoping for, as I knew the chances of having it marketed by the manufacturer would be close to null.

Then I spotted a later LF release of what looks like exactly the same molds

https://www.scalemates.com/kits/fly-72050-caproni-101--1326407

that features the civil registration I-ALBA among the decals' options, and suggests in the instructions the necessary mods. Problem is, the decals are not totally accurate, as I-ALBA shows in a the only photo I found the then common long bars below the regs on fuselage and wing. Besides, the modeler will have to plug the dorsal opening and provide for the passenger cabin, discarding all the bonga-bonga equipment. I see no mention of that in the instructions of that boxing, other than to install windows and drill a porthole in the door.

Browsing through my files for a suitable conversion of the kit, I came across several candidates, one of them, I-ABCQ, presents an interesting option. Photos show the plane in three different schemes:

1) As a sort of joyride (photos above) that toured Italy giving the locals flight experience, in what looks like perhaps ivory color with black regs, with seemingly black nose and engine gondolas, provided with passenger seats and windows. Here is a movie of it. The door is slightly different and it has full passenger capacity (other versions that operated long routes had less seats):

https://www.youtube.com/watch?v=jf2AfW4JOaI

2) In some undetermined color and white regs on fuselage, and color regs on white background under the wings. Windows fully or partially deleted, equipped with four loudspeakers inside the fuselage, and two compartments for technician and speaker.

3) Another incarnation of the plane in colorful livery, also with sound system equipment for aerial advertisement, with perhaps only two windows visible, and owner's company (La voce del cielo) motto on the nose ("Vox coeli vox populi"). The only photo I found (in Airhistory.net) of this version shows it on the tarmac in Holland, where reputedly announced Verkade biscuits. I found several contemporary newspaper articles stating its flights, broadcasting music from an altitude of about 1.000 meters.The power for the broadcast system was obtained via four wind-driven generators of one-blade prop, located under the wings (two and two). The blades were adjusted automatically as to provide a constant current at all flight speeds.

An article in Italian on vintage radio and communication equipment provided some additional info, and, what's better, photos (but not good ones) of the exterior and interior (for the second scheme).

For this candidate the engines that come with the kit would do, but other civil airframes I am considering and researching would require after-market engines (Bristol Jupiter and Lynxes). These planes with alternate powerplants seem to have, studying photos, a shorter nose of slightly different shape to compensate for the Jupiter engine. Links to GAVS:

I-ABCB https://gavs.it/rci/record/589

I-ABCC https://gavs.it/rci/record/590

I-ABCJ https://gavs.it/rci/record/598

I-ABCK https://gavs.it/rci/record/599

I-AAZA can be seen here:

https://www.youtube.com/watch?v=HBq3PBhrxXg

All these planes have some variations in details, among them:

a) Different power plants, different exhaust arrangement, different propellers -in some cases rotating in the opposite direction than those in the kit

b) Details on the landing gear legs

c) Different doors

d) Different window arrangement

e) Different interiors

f) Variations on the nose shape

so a choice will have to be made soon, as modifications need to start early in the build (window arrangement, for example).

The kit: Interesting level of interior and exterior details, perhaps just a bit heavy handed on some items, with a feeling that leans towards hefty, and somewhat thick molds. Plenty of ejector towers that will have to be dealt with, some flash. The resin parts add to the package, but I ordered the Brengun P.E. detail set to improve or replace some of the kit parts, and add others. Some fragile details on the resin parts came already broken, as it's often the case when resin parts are bagged together -heavy and delicate ones- and suffer the cocktail shaking of transportation. The engine cylinders will require your participation adding the pushrods for each cylinder for the three engines. How fun. The engineering seems sound, but some solutions are perhaps dubious: the front transparency is split in two parts, right in the middle. I haven't seen this since Paleolithic kits. Of course, in order to civilize this model, some parts will be discarded (pim-pum-paf parts) and others will need to be fabricated, once I decide the path: loudspeaker plane or passenger carrier.

Contents:

A bit of mold seams and flash:

Ejector pins that will need removal:

Some details are a bit overstated:

Interior structure (and ejector pin towers):

The resin parts:

Fair detail:

The cylinders lack the pushrods and other detail. The prop hubs seen in the photo are for other boxing:

In case I go for a modification version that needs the other engines:

Transparencies with good clarity:

Optional parts:

And who knows why, a front transparency divided in two, what a joy:

Not sure if that broke or it is like that, missing a "petal":

Parts separated from their casting blocks and cleaned:

Some of the fragile bits broke in transit, of course:

The hubs (that are really not very good) are not for this version:

If this tailwheel is used the resin rods need removal and replacing with metal pins, otherwise we all know what will happen:

As said, some of the fragile parts broke in transit, as the resin bits were all together knocking around in one bag:

The instructions mention the aileron actuators:

Here too, but there are none:

 

All parts separated and cleaned up. A somewhat tedious job due to the molds' ejector pin towers and sprue gates. You can see two sets of props and landing gear legs, as the same molds cater for different boxings:

Some parts that come in halves are glued together. As mentioned, there are no locating devices for most parts. The feel, hefty weight, and "solidness" of the parts and sub-assemblies remind me a bit of Valom kits:

 Before advancing much further, the specific plane to be modeled has to be chosen, as subtypes varied, and the above-mentioned broadcasting plane had no passenger interior:

Of course the dorsal position on the mold has to be occluded (dry fit):

The window here is present in the loudspeaker plane, but I don't think it was there for the passenger versions:

The pencil line shows the shape of the door for the loudspeaker plane (and some of the other civil versions):

 

Just in case, the kit's engines are assembled. They are sort of generic in appearance, and the corresponding props rotate anticlockwise seen standing facing the nose of the plane, which is not accurate for some of 7cylinder power plants the plane used (Lynxes, for example):

As I order the Brengun P.E. set, I have to wait to start the cockpit, a sub-assembly common to most versions, as the set included an inst. pan. and pedals to replace/complement the kit parts.

I changed course midway and instead of going fore the loudspeaker version, will do a full passenger version at the service of Ala Littoria, I-ABCJ, and already started to modify the fuselage for that.

The plane had a two color scheme (I am guessing light blue and ivory), it had almost straight, horizontal mudguards, a Jupiter engine in the nose and two Lynxes as explained above, 8 seats (six in cabin and two "second class" in the back, and bathroom:

From "Aeroplani Caproni dal 1908 al 1935 - Caproni G." (the page describes a similar interior, not the one in the plane I am modeling, which has some changes):

The modifications are not made easy by the thick and hard plastic, which, as I said above, reminds me of the Valom plastic:

The three bulkhead frames included in the kit have to be consigned to the trash can, as this interior needs full bulkheads with doors, and the "structure" inside the fuselage side has to be covered with sheet styrene:

As far as I can tell, and according to all the photos I have, Fly missed the auxiliary strut that connects the aft wing strut to the fuselage. This is easily correctable, and surely from the spares bin a coupe of suitable parts can be adapted -or just scratched, still, a little bit of an obvious omission on part of the manufacturer:

The notch on the aft wing struts should point out, not in as in the instructions, that will have you locate the nacelle tip in it. It was actually where the missing secondary struts attached:

The aftermarket engines:

Much more detailed than the ones in the kit, as one would expect:

The Jupiter aftermarket engine. Notice that spare cylinders and intakes, always welcome, whilst the kit gives you exactly the number you will use, no spares, so heaven forfend one of those in the kit goes to the twang dimension:

To the left discarded parts from the kit, to the right the ones I might still use:

The Jupiter is being assembled:

Engine assembly completed...but not quite so. The pushrods at the front were omitted by the manufacturer, and have to be added from wire, stretched sprue and the like.

The broken mudguards are repaired with metal lengths, in any case the kit's feeble supports, if not broken in transit as they did, would have broken soon after anyway, as resin has very low mechanical strength in thin items:

Work on the interior continues:

Dry run of the seats. And yes, the restroom had a window!:

As mentioned the kit's props (background) rotate in the "wrong" direction for the engines I am employing, thus new ones are being made of laminated thin plywood:

The props are ready. The one for the Jupiter has a slightly bigger length:

The engine fairing is added to the engine nacelles, as it fits quite well the new aftermarket item. The photo-etched set has arrived. Only a very few items can go in my version, so most of it will go to sleep the long sleep of the spares bin:

The structure is covered in paneling, as it corresponds to an airliner. Notice the addition of sheet spanning the gaps where the top position and belly window were. They will help as support later when adding the tailored styrene sheet plugs once the fuselage halves are joined:

A coat of primer to a group of components:

As mentioned before, the canopy comes split in to halves, as the geometry is a bit complex and the sides lean inwards. But the two-part is a less than ideal solution for a number of reasons, all too obvious. This canopy needed a multi-part mold, something the industry understandably avoids of course because it's expensive. So the problem is passed to you, the modeler. I used an enhanced strength acrylic glue, and may use a P.E. part that comes for it spanning the two halves that may help stabilizing it, we'll see:

One thing neither the kit nor the aftermarked P.E. set provide is the rudder control horn, I found one in my spares:

Using as guides the locating holes provided for the struts, drill through to make the anchoring for the wire tail rigging:

The aftermarket P.E. as explained caters for the kit's versions, not mine, still, some things are not quite right. These are actually windows, visible in many photos, so my intention of using this part to reinforce the two-part transparency won't work:

The 101 had a strange control wire rigging, all external and to the right of the fuselage only, via double control bars at the front and single at the tail. Their positions has to be drilled:

Also the many tail rigging and control wire positions:

The legs need brake rods, so their position needs drilling too (I put those lengths of stretched sprue just to indicate the position):

As an example: the canopy in the kit does not match any of the photos I have (but who knows, there may be other versions). You can clearly see here four oval windows, and what seems like two rectangular transparencies on top. The geometry of the side panels is different from those in the kit. Visible here are also the control cable bars on the fuselage side:

The image above is a detail from a photo on Wikimedia:

https://upload.wikimedia.org/wikipedia/commons/7/76/Caproni_Ca._101_bomb%C3%A1z%C3%B3_%28Olasz_fest%C3%A9ssel%29._Fortepan_17579.jpg

And whilst the more recent LF release does include the clear parts (and paint) masks, the Fly version doesn't, nor I could find an a.m. set for it.

The oil fillers are made and inserted in the nacelles:

The plane I want to represent has the wind-driven generator on a ventral position, among the landing gear legs. It's a bit bigger than the ones provides in the kit, so I scratched one. You shape the two ends of a styrene rod, one as a tailcone and other as a domed front:

Drill a hole for the propeller:

Cut and cement the parts together:

Insert a prop made of recycled aluminium sheet, shaped and twisted to get the blades' pitch:

You can do this in any size you want:

Clarity and appearance improve as usual with a bath in acrylic floor polish:

A base coat of paint is airbrushed on several parts:

 Progress with the engines and interior:

And now the acme of the scratchbuilder: the toilet roll!. It begins spreading glue on a length of narrowly trimmed real tissue paper:

A thin styrene rod is attached and slowly and carefully rolled over:

The brackets are trimmed down once the glue has set. In the foreground the tissue paper roll, in the background the toilet roll of the lazy scratchbuilder: just a short length of styrene rod and glued brackets on the side. But I am telling you, your 1/72 crew and passenger will know the difference when they need the restrroom:

The interior so far:

Dry-fit check to see how things go:

Why carve out and then add a clear window to the door, when you just can make the door in clear plastic (CD case in this case), mask both sides, and paint interior and exterior colors? And when you are at it, drill the handle hole. Make two, chose the best fit:

The landing gear legs and mudguards will be painted metal color together with the engine nacelles:

The kit's oil coolers will not do for this version, which has a different type. All those resin bits go to the spare bin to live another day:

Fred Hultberg of Fotocut used to make and sell fantastic ones, now sorely missed (both, Fred and his products), together with many of his wonderful photo-etched items, which were varied, affordable and absolutely useful. Instead, I have acquired similar oil coolers from a German outfit that I will adapt to the model:

 

To be continued....