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Kirt Blattenberger
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Even during the busiest times of my life I have endeavored to maintain some form of model building activity. This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD. There is a lot of good information and there are lot of pictures throughout the website that you will probably find useful, and might even bring back some old memories from your own days of yore. The website began life around 1996 as an EarthLink screen name of ModelAirplanes, and quickly grew to where more server space ...

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Iron Curtain Engines - Da? Nyet?
August 1962 American Modeler

August 1962 American Modeler

August 1962 American Modeler Cover - Airplanes and RocketsTable of Contents

Some things never grow old. These pages from vintage modeling magazines like American Aircraft Modeler, American Modeler, Air Trails, Flying Aces, Flying Models, Model Airplane News, & Young Men captured the era. I will be glad to scan articles for you. All copyrights are hereby acknowledged.

Amazingly, even during the Cold War years it was not uncommon to see aircraft modelers from the "Iron Curtain" countries participating in international contests. Even Commies like flying model airplanes. Because their societies and politics were so closed and guarded, getting information about their modeling supplies was darn near impossible except during events where inspection could be made. Being a generally friendly bunch of guys, the modelers would share their designs with the Free World, and vice versa. Then, in subsequent years the Commies would show up with equipment that was exact replicas of ours - copyrights and trademarks held no legal weight behind the Iron Curtain. Truth be know, most or all of the participants were probably KGB agents (or other Commie country equivalents) engaging in extracurricular espionage activities when not at the flying field. This article from the August 1962 edition of American Modeler presents an amazing collection of model engine photos and technical specifications.

Ironically (and sadly), many people today in the U.S. are beginning to view Russia as more free and tolerant of traditional American-type values than the current U.S. political climate permits.

Iron Curtain Engines - Da? Nyet?

Iron Curtain Engines - da? nyet? from August 1962 American Modeler Magazine - Airplanes and RocketsRed engines - how good are they? Let us say, right away, that there is no short. easy answer to this question. In the West, commercially built model motors are, in general, pretty good nowadays ... no manufacturer can hope to survive for very long if he markets a dud product because competition is too keen. In the Soviet Union and satellite countries, the entire background to model engine production is vastly different and it results in some highly divergent interpretations as to what constitutes an acceptable product.

To understand this we must remember, first, that privately owned model engine factories, on the scale seen in countries like the United States or Great Britain, just do not exist in Russian and Eastern Europe. Contest engines are built mainly by individuals or by small groups, usually working under the auspices of an official, state-sponsored modeling organization. Such a group may consist of six or eight professionals, designing, building, testing and developing prototypes and then, in due course, producing powerplants in relatively small numbers - rarely more than a few hundred, sometimes only a few dozen. In addition, the group may undertake other Iron Curtain Engines - Airplanes and Rocketstechnical work, such as building R/C equipment.

Typical of this sort of set-up is the model development center at·Brno in Czechoslovakia where the famous MVVS engines are made. The center was established in 1953 and one of its first tasks was to produce a racing engine that would put the Czech C/L speed team at the top of the World Speed Championships. And this it did.

Russian VIP-20 is well-made .15 - Airplanes and Rockets

Russian VIP-20 is well-made .15 with disk valve, ball bearing shaft and lapped piston.




Czech MVVS 2.5/'58 diesel .15 - Airplanes and Rockets

Czech MVVS 2.5/'58 diesel .15.




MOKI M-3 is new .36 c.i.d. stunt motor - Airplanes and Rockets

MOKI M-3 is new .36 c.i.d. stunt motor built by the official Hungarian model research institute.




Hungarian Krizsma Record .15 diesel (drawing) - Airplanes and Rockets

Hungarian Krizsma "Record" .15 diesel - Airplanes and Rockets

Hungarian Krizsma "Record" .15 diesel. Won FAI F/F team championships. (drawing above)




Moscow MD-2.S (drawing) - Airplanes and Rockets

Moscow MD-2.S - Airplanes and Rockets

Production of 10,000 Russian .15 c.i.d. Moscow MD-2.S's is planned. Has many racing mill features. (drawing above)




Czechoslovakia's MVVS 2.5/1959 racing .15 (drawing) - Airplanes and Rockets

Czechoslovakia's MVVS 2.5/1959 racing .15 (parts) - Airplanes and Rockets

Czechoslovakia's MVVS 2.5/1959 racing .15 - Airplanes and Rockets

Czechoslovakia's MVVS 2.5/1959 racing .15 with Dooling type bypass. Note big ports in piston. (see drawing and parts & drawing above)




East European MVVS 5.6 (parts) - Airplanes and Rockets

East European MVVS 5.6 (drawing) - Airplanes and Rockets

East European MVVS 5.6 - Airplanes and Rockets

Best East European stunt motor to date is MVVS 5.6; won '58 Internats. (see parts & drawing above)




Polish Jaskolka-II diesel (parts) - Airplanes and Rockets

Polish Jaskolka-II diesel - Airplanes and Rockets

Polish Jaskolka-II diesel, made in P.Z.L. aircraft factory; reed valve, ball-bearing shaft. (see parts above)




Hungarian V.T. 0.25 (parts) - Airplanes and Rockets

Hungarian V.T. 0.25 - Airplanes and Rockets

Hungarian V.T. 0.25, smallest Iron Curtain mill; 0.015 cu. in. disp.

The construction of less specialized types of engines, made in large quantities for the ordinary modeler, is usually undertaken by state-owned factories. In many cases, the factories have little or nothing to do with the actual design of the motors, design and development of prototypes is the responsibility of individuals or groups and the factory takes over after the test stakes are concluded. The factories employed to produce the engines are of many types. In some cases they are big industrial plants, such as the P.Z.L. aircraft factory in Poland and the Carl Zeiss optical works at Jena in East Germany.

In other instances, established designs have been freely copied. This is particularly apparent in Russia where, for instance, exact duplicates of the earlier type Italian Super-Tigre G.21 0.29 cu. in. glow motor and the West German Webra Mach-1 0.15 cu. in. diesel, have been produced under different names.

The standard of work turned out by the specialist groups, especially some of those operating under the state modeling institutes, such as MVVS, or Hungary's MOKI, is usually high. This does not always hold true for the quantity-produced factory items. In some cases it appears that production has been assigned to plants ill-equipped for the production of model motors to the desired standards of quality - standards which western modelers take for granted.

In Czechoslovakia, for example, factory-made versions of MVVS 0.15 and 0.29 cu, in. racing type glow motors began appearing under the name "Vltavan" during 1956-57. Although these engines had all the technical features of the MVVS prototypes (ball-bearing shafts, ultra-light ringed pistons, disk-valve induction) they lacked precision and, as a result, failed to approach the performance of the MVVS originals. A production of 5,000 units per year was estimated for these engines, but it seems extremely doubtful if this was ever reached. The Czechs then adopted a change of policy, taking on more employees at the MVVS center and embarking on a program of limited quantity production in the center's own workshops.

Apart from the sources mentioned, a few engines have also been produced privately in small workshops owned by one man or a family. Typical of these were the AMA engines made by A. Machacek in Czechoslovakia and the East German Wilo and Schlosser engines produced, respectively, by Willi Otto and the father and son partnership of Max and Benno Schlosser. In the early post-war years, such outfits turned out most of the engines available at that time.

From the foregoing it can be seen that up to the present modelers in these countries have had to look to the research and development centers, like MVVS, for contest-grade engines but, since the production of such engines is limited, many modelers have to fall back on less impressive factory-built substitutes. The type of engine available to an individual modeler is not so much dictated by what he can afford to pay for it, as by his ability and reputation as a modeler. For example, in 1956, MVVS made only eight and, in 1957, only four, of their special 0.15 cu. in. racing motors. These went to selected Czech international speed contestants. Subsequent, less exotic, but still above average, MVVS productions were distributed to official clubs for allocation to top grade modelers. More recently, since MVVS began quantity production on a small scale, MVVS engines have been more widely distributed ... but this is the exception rather than the rule.

Although the average factory-made model engine produced in Eastern Europe is not up to the quality and performance of its Western counterpart, nevertheless, there have been efforts to export some of these engines, not only to countries within the Soviet sphere of influence and to the uncommitted nations, but to Western countries as well. The Hungarians and East Germans have been the most active in this sphere with Alag, Aquila, Proton and Zeiss powerplants. The Hungarian foreign trading organization, "Artex", placed advertisements in Western magazines and has succeeded in selling a limited number of engines through wholesalers in England, Australia and some West European countries.

Up to the present time, sales of East European engines in Western countries have been small. In some cases, importers have been left with stocks of unwanted engines when dealers failed to reorder. Nevertheless, there are good reasons for believing that it would be a mistake to write off the East European model engine industry as being no potential threat to Western manufacturers. One large West German model company, for example, is currently selling a range of diesel motors made for them in Hungary.

Originally, this company wanted a low-priced beginner's engine and bids "Were invited from various manufacturers.

A British firm quoted approximately $1.70 and was thought to stand the best chance. The contract, instead, went to the Hungarians, who undercut the British price about 25 percent. East European quantity-built diesels, in fact, are up to 50 percent cheaper than Western engines of similar type. This may not be too important to the average Western modeler who may have to pay (by the time import duties are added) nearly as much as for a domestic product. But it could mean that we may find unexpected competition for our products in less highly developed countries. On the other hand, so long as we have manufacturers such as Cox, who, by the use of advanced, highly mechanized production methods, can turn out a better product at a lower price than the low labor cost countries, America can remain the world's biggest model engine exporter.

Let's have a look at some of the engines which modelers in Russia and the satellite countries have been using lately. During the past three or four years, we have tested upwards of a couple of dozen different types of model engines from the East. From these we have selected ten representative, current examples for examination.

MVVS 2.5/1959. This is the best .15 cu. in. glow engine yet produced behind the Iron Curtain. The engine, a development of previous MVVS World Speed Championship winning engines, first appeared in 1959 when about twenty were made, primarily for Czech speed experts and we secured one of these originals. The engine created much interest and was subsequently put into limited production. Examples have since found their way to many countries outside Czechoslovakia. At the last major international event for FAI speed - the Criterium of Aces held in Belgium in September 1961 - these motors were used by Swedish, Belgian, Swiss and German modelers, in addition to the Czech team. A few have also appeared in the U.S. and, last year, Lt. David Cotton was clocking up to 119-mph in FAI speed with an MVVS, occasionally hitting as high as 138 on nitro. He threw a rod at Huntsville after qualifying to fly in the U.S. FAI team eliminations. These performances, we might add, are just about the best that have been recorded with an MVVS outside the official Czech team.

Designwise, the MVVS is of the classic racing engine layout with twin ball-bearing supported shaft, disk-valve induction, a ringed, aluminum piston and a Dooling-type hemispherical bypass. The piston is a work of art. It has two vast ports which take up practically all the skirt surface on the bypass side and, complete with rings, conrod and full-floating wristpin, it weighs only 0.22-oz. In our example, compression seal provided by the rings is outstandingly good and the motor starts almost like a beginner's job.

Another interesting feature is the disc-valve, unusual in that it uses a cast-iron rotor, mounted on a steel shaft drilled for lubrication and running in a long bronze bearing in the backplate. The engine has the same backplate and inclined carburetor as an earlier version but this is rotated through 90 degrees to locate the intake at the bottom. The rotor gives a conventional intake timing of 45-deg ABDC to 45 ATDC. The exhaust and bypass timing is also orthodox with periods of 130 and 110 degrees of crank rotation respectively. The motor has the widely favored Continental European .15 bore and stroke combination of 15-mm x 14-mm (0.5905 x 0.5512-in). Weight is 5.1-oz.

On its introduction, the Czechs rated the MVVS 2.5/1959 at 0.38 brake horsepower at 18,500-rpm, a figure which put it above any Western 0.15 available at that time. Our own tests indicated an output of 0.35-bhp at around 18,300 on a commercial racing fuel (30 percent nitro-methane) to which 10 percent extra nitro-methane had been added. This was with the engine in strictly stock condition and retaining the standard spraybar in the intake.

Moscow MD-2.5. This Russian built racing type .15 was announced in 1960, when it was stated that it would sell at the equivalent of about $8.50 and that a production of 10,000 units was planned over a five year period. The Moscow is obviously based on the MVVS 2.5/1959 just described, presumably adapted to suit the factory production facilities available. All castings are pressure die, instead of sand castings and the engine shows a number of production economies which, in our example, were reflected in somewhat sub-standard construction and performance.

The lightweight, ringed piston was quite nicely made and the cylinder liner was well finished with cleanly cut ports. However, piston/cylinder fit was poor and resulted in extremely reluctant starting, necessitating a castor-oil prime to seal the rings. Also, the ball-bearings were rather a sloppy fit in their housing. As on the MVVS, the valve rotor is mounted on a 3.5-mm shaft running in a bronze backplate bush, but is of aluminum instead of cast-iron. An unusual and not altogether satisfactory arrangement, the inclined carburetor simply plugs into a tapered boss in the backplate without any set screw or clamp to secure it. Bare weight is 4.8 oz. The engine is available with either a spinner type prop mounting or a flywheel for boat use.

The Moscow MD-2.5 is nominally rated at 0.30 bhp. However, the best we could get from our example was barely over .24 using 30 percent nitro racing fuel. We also checked it against a Cox-Tee-Dee .15 on identical props and fuels and obtained the following: 8 x 4 Top-Flite Nylon, 13,000-rpm (Tee-Dee, 16,600): 8 x 3 1/2 Top-Flite Wood, 14,250 (Tee-Dee, 17,600): 7 x 4 Power, 15,700 (Tee-Dee, 19,400).

We accept the possibility that our test MD-2.5 may have been a particularly bad example. Even so, it is quite obvious that this engine is no threat to the established top contest .15's at the present time.

VIP-20. This original powerplant takes its name from the initials of its designer, the well-known Russian free-flight modeler, V. I. Petukov. It is another 0.15 cu. in. disk-valve, ball-bearing glow engine, but our example was of much superior finish and performance to the MD-2.5.

Construction features a one-piece cylinder block and crankcase with integral intake, the valve disk being mounted in the rear and giving a timing of 48 ABDC-46 A TDC. The finely made cylinder sleeve, a slip fit in the main casting, has multiple ports despite the use of a lapped piston. The piston is unusual, having a flat head with a curved step type deflector on the bypass side. Resultant exhaust and bypass periods are 148 and 128 degrees respectively. The engine has a normal type bypass passage but gas entry into the bypass is supplemented by rectangular ports in the piston skirt and liner. An unusual detail is the needle-valve and venturi assembly which allows the needle valve to be installed in any one of four positions, left or right, upright or inverted.

Claimed output for the VIP-20 is 0.38-bhp at 18,000-rpm on 25 percent nitro. The test engine did not quite equal this figure but, on 30 percent nitro, was comparable with a Cox Olympic. Bore and stroke are 15.2 x 13.6-mm (.5984 x .5354-in).

MVVS 2.5/1958 and 25-D. The MVVS 2.5/1958 was the result of efforts to provide the Czech team to the 1958 World Championships with an FAI 0.15 free-flight diesel comparable in performance with the Oliver-Tiger. This was a twin ball-bearing motor of which about a hundred were made, but a plain bearing version, with minor improvements was also put into series production under the designation 25-D. We obtained a 25-D from one of the Czech team members at the 1958 World Championships and subsequently acquired a 2.5/1958 also. There was little difference in performance between the two models: both delivered near to 0.30 bhp at between 15,000 and 16,000-rpm closely approaching the performance of the stock Oliver.

Quite unlike the Oliver in design, the MVVS diesel is a loop-scavenged motor and may possibly have been influenced to some extent by the Japanese Enya 15-D MkI which first appeared a year or two earlier. Like the Enya, it features a large diameter shaft, a divided bypass - and in the 25-D version a cutaway piston skirt on the bypass side. In addition, it has a distinctive, oblique bypass port which causes the outside edges of the port to open earlier and close later than the center area.

Both models are well made and easy to handle. Bore and stroke is 15 x 14-mm. The 25-D weighs 4.7-oz, 0.3-oz less than the 2.5/1958 and about an ounce less than the Oliver.

Krizsma Record K-6. The Hungarian Krizsma Record .15 diesels were second only to Oliver-Tigers in numbers used at the big 1960 World Free-Flight Championships, where they were employed exclusively by the Team Championship winning Hungarians and also by the Polish team. Two models have been built, the K-6 (with which this report deals) and the K-8, a ball-bearing version of the same motor.

The design of the K-6 is strictly orthodox: i.e. a shaft valve, radially ported, plain bearing layout such as has been popular for European diesels for many years. The standard of workmanship, however, is of an exceptionally high level and we would rate this the best finished engine that has so far reached us from Eastern Europe. Die-casting is exceptionally clean, fits are excellent and finish, inside and out, comparable with the best Western standards. The engine uses multiple large Volume internal bypass flutes on the pattern of the West German Webra Mach-1. On test we obtained an output of 0.286-bhp at 14,700-rpm which is very good for a plain bearing diesel of this size and type. Bore and stroke are 15 x 14-mm. Weight 4.7-oz.

Jaskolka 5G-2.5 Mk.2. The Jaskolka ("Swallow") is one of a series of model motors designed by one of Poland's best known model engineers and free-flight modelers, Stanislaw Gorski. It is built at the P.Z.L. aircraft plant.

The model featured is the Series 2 version with reed-valve induction and twin ball-bearing shaft. The Jaskolka has also been built in plain bearing and rotary valve models. Cylinder porting is again of the Webra type just described and the major components, crankcase, cylinder, backplate and head, are threaded assemblies, no separate screws being used. The carburetor screws into the backplate, clamping a 0.005" spring steel reed and can be rotated through 360 degrees to bring the needle-valve to any convenient position. Performance is about average for engines of this type - around 0.25-bhp-and the motor weighs 4.75-oz.

V. T. 0.25. V.T. stands for Vella Testverek or Vella Brothers. Andras and Geza Vella design and build the V.T. Alag and Aquila diesel and glowplug engines in a plant in Budapest and production is reported to be "a few hundred" monthly. The diminutive V.T. 0.25 diesel is the smallest engine produced so far in Eastern Europe - half way in size between Cox's Tee-Dee 0.010 and 0.020 models. It is 1-5/16" high and weighs 5/8-oz. Design and construction follows the same general pattern as the larger V.T. diesels, except that a cast-iron piston is used in place of the aluminum one favored earlier by the Vella brothers. This is better, since the aluminum contra-piston, having a higher coefficient of thermal expansion, tended to seize in the bore when the motor reached running temperature. A rather unusual simplification on the V.T. 0.25 is the back cover, which merely presses into the crankcase instead of be­ing threaded.

Kometa MD-5. This Russian-built glow 0.29 is an exact copy of the earlier type Super-Tiger G.21 with ringed piston and detachable front plate. Not so well made as the Italian original, it has been quite widely used by the Russians, with minor modifications, for stunt, speed and speedboat work. Performance varies to some extent between individual examples but, from tests we have made, the Russian claim of 0.50-bhp is not unduly optimistic for a reasonably good example running on about 30 percent nitro. (This compares with the Super-Tigre rating of 0.80-bhp at 17,500, for the original which was a trifle exaggerated.)

Crankcase/cylinder-block, front housing and head are all pressure castings, reasonably well produced but without any surface treatment to improve appearance. The generously proportioned, unhardened shaft has a 12-mm main journal, a 9-mm gas passage and is blued on non-working surfaces. It has a big rectangular valve port, registering with a similar aperture in the bearing, to give a quoted timing of 35-deg ABDC to 70-deg ATDC, although the measured timing on our example was, in fact, 25-55. The shaft runs in 12 x 28-mm 8-ball inner, and 7 x 19-mm 6-ball outer bearings, the rear race centering the housing in the case. The pressure cast piston has two rings and a full-floating tubular wrist-pin. The slip fit cylinder sleeve is well made with multiple ports cleanly cut. Bore and stroke are 19 x 17-mm (.7480 x .6693") and the motor weighs 7.4-oz.

MVVS 5.6. The 0.346 cu. in MVVS 5.6 is the most successful East European stunt engine produced to date. It was designed in 1957 and one was subsequently used by Josef Gabris to win the world stunt championship for Czechoslovakia in 1958. Prior to this, on September 15, 1957, a special hopped-up version, reduced to 5cc displacement, broke the world record for Class II speed models with 151.6- mph in the hands of Bohumil Studeny, an MVVS employee. More recently, at the Belgian Criterium in September 1961, Sirotkin of Russia and Herber of Czechoslovakia, both using MVVS 5.6's and competing against the cream of European stunt flyers and the world's best stunt engines, placed 2nd and 3rd behind the Fox 35 powered entry of World Stunt Champion Louis Grondal.

The remarkable thing about the MVVS 5.6 is that, except for having a similar displacement, it is quite unlike the accepted idea of a stunt 35. For a start it has a ringed aluminum piston, rear disk valve induction and a ball-bearing shaft. General design, in fact, follows that of the MVVS racing engines except for a near vertical intake, reduced frontal overhang and more conservative rotary-valve timing of 50-30. Construction is to the usual MVVS standards. All castings are sand cast and extensively machined and metal-to-metal joints are used throughout. The engine weighs 7.25-oz and has a 20 x 18-mm (0.7874 x 0.7087") bore and stroke.

The MVVS 5.6 was designed to operate on straight 75/25 methanol/castor­oil fuel because of the severely limited availability of nitro methane in Czechoslovakia. Our engine, on a low (3 per­cent) nitro content commercial fuel delivered 0.54-bhp at a little over 13,000 rpm. It was extremely easy to handle and starting was as good as, if not better than, the best conventional lapped piston 35's.

MOKI M-3. The equivalent of the MVVS center in Hungary is MOKI and the latest MOKI product is the M.3, a 0.364 cu. in. stunt glow motor. The layout of this motor is generally similar to that of western stunt 35 class engines. It uses a unit die cast crankcase and main bearing (the latter bronze bushed) and a mild steel cylinder with integral fins. The pis­ton is very light and is relieved below the wrist-pin centers. The hardened, counter­balanced crankshaft has an ll-mm diam­eter journal and a moderately sized valve port which gives 40-40 induction timing.

Claimed output for the M-3 is 0.55-bhp at 14,000-rpm on 75/25 methanol/castor. The engine has a bore and stroke of 20 x 19-mm (0.7874 x 0.7480") and weighs 7.6-oz. Like the Russian glow engines, the MOKI is taped to take a standard "western" size 1/4 x 32 TPI glow plug, unlike the Czech MVVS engines which use 6- mm metric thread plugs.

In conclusion, it is interesting to note that while engines from the Eastern bloc countries are seldom seen in the U.S., quite a few American and other Western motors have been used on the other side of the Curtain. In Hungary, especially prior to the advent of MOKI engines, Western motors have been quite widely employed in contests ... notably McCoy and Super-Tigre for CIL and Webra for F IF. In Czechoslovakia, the national championships for stunt and team-racing have twice been won with McCoy and Oliver- Tiger motors. In Poland, Super­Tigre, O.S. and Webra motors from Italy, Japan and West Germany have been officially imported for the use of leading contest modelers. And at the last World Stunt Championships, the two highest placed modelers from the East, Dr. Geza Egervary of Hungary (5th) and Yuri Sirotkin of Russia (8th) used Veco 35 and McCoy 35 motors respectively.


Russian Kometa MD-S (parts crankcase) - Airplanes and RocketsRussian Kometa MD-S (parts) - Airplanes and Rockets

Russian Kometa MD-S - Airplanes and Rockets 


Russian Kometa MD-S is carbon copy of early Italian Super-Tigre. Moscow MD-2.S has MVVS features. (see parts above)














Posted April 13, 2014