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Aerobatic world championship 1975 Bern / Suisse


Aerobatic R/C Airplane World Championships BERN, 8.-13.Sept. 1975

THE World Radio Control Championships for aerobatic model aircraft came home for the ninth successive competition for the King of the Belgians trophy at Bern, Switzer-land, September 8th-13th.

For it was in Switzerland, at Dubendorf in 1960, that the first ever Championships took place. Just 20 competitors, from eight nations contested that first event— this year there were 76 competitors from 26 States.


Welcome to Bern


Who won? Wolfgang Matt from one of the world’s tiniest states, Liechtenstein, is the new World Champion — a well deserved win after coming so near on two previous occasions. Hanno Prettner from Austria was the runner up and Dave Brown of U.S.A. placed 3rd, to edge out last time’s Champion, Tsugutaka Yoshioka from Japan.
The Americans took the team prize and there must be something about the air in Liechtenstein, whose three man team took 2nd in the team order.
Bern’s Belpmoos airfield has a single tar-mac runway and sits in a narrow valley with high hill-sides which produce a highly scenic effect bettered only by the view of the distant alps at one end of the valley. At many .times during the week, such famous peaks as the Eiger and the Jungfrau were clearly visible in snow-covered splendour which enticed many to slip away from the competition for a few hours.


Liechtenstein Team


Practice days Monday and Tuesday proved the presence of very severe interference on the 27 MHz waveband, caused by, among other sources, Hospital Diatherme units, R.F. welding equipment, taxi cabs and even digital radio control equipment. Yet competitors were expected to fly, even though some 27 MHz `spots’ were virtually solid. A particularly bad case was Dekker of Holland who found out the hard way by straining his model through the crash barrier on take-off, nearly killing a spectator in the process, something which should never have happened if an efficient monitoring and warning system were i n Operation.


The World Champion with his beautiful plane


A more spectacular victim of Tuesday’s practice session was Bruno Giezendanner of the host nation, who came off worst in a frequency tangle with one of the Norwegians on the opposite flight line, and Harald Neckar from West Germany, who did so well at the previous Championship at Gorizia in Italy experienced a wing failure in practice, Tuesday midday.
Our own team of Terry Cooper, Mike Bone and Keith Maundrel, under team manager Geoff Franklin were only slightly less effected.

Neither Cooper nor Maundrel managed an interference-free flight during the practice rounds, terminating prematurely to keep models in one piece, while Mike Bone never did manage to get his model off the ground during official practice sessions, due to solid interference on 27.045. All this gave rise to much frequency swapping and jokes involving dreams about St. Bernard dogs arriving loaded down not with barrels of Brandy, but with crystals for alternative, unaffected frequencies!


German competitor Harald Neckar and his Mephisto


Joking apart though, and despite interference, there were some impressive per-formers during the practice rounds and it became evident that in some quarters there has been some real improvement. Bertolozzi from Italy for instance made a few people stand and watch during practice and Kjeelgren from Sweden too was pretty good, while the brand new team from U.S.A., Brown, Miller and Radcliff — all new boys, performed well, Brown and Radcliff with extremely fast models.


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The Video (Bernt v.Boetticher)

Tuesday’s practice round was punctuated with an opening ceremony during which a full size Akrostar aerobatic aircraft was flown through the full F.A.I. R/C model aerobatic schedule and then continued with a convincing demonstration that anything we can do they can do better, involving an impressive free-style acrobatic schedule. So next time you hear someone sounding off about how our models can do more than the full size it`s a load of bunk!




When Round one opened Yoshioka from Japan. The reigning world champion , competing this time as an individual rather than as a member of the three man Japanese team (a right of the retiring champion) was an early customer and a target for close scrutiny, followed shortly afterwards by Mark Radcliff of U.S.A., whose swept wing O.S.60 FSR powered Phoenix 6 really carved the air at high speed.




Okumura from Japan took a zero after overrunning his start-up time and his team-mate Naruke was one of many throughout the competition who performed well but failed to position their manoeuvres centrally on the judges’ line, losing valuable points needlessly.


Guenter Hoppe starts


Jeff Tracey (Big Trace) from Australia gave us all a lesson on how to drown the noise of your engine when calling manoeuvres, and then it was time to watch U.S.A.’s youngest team member, 17-year-old Rhett Miller, whose Compensator design went through the schedule very nicely indeed, but with not quite absolute clinical precision, particularly in the hesitation rolls — although maybe after the build-up given him in the U.S. model magazines, we were expecting miracles. (lt would be nice to fly the schedule just half as well). Bruce Turner from New Zealand, fielding a team for the first time, hardly looked as though he had been flying R/C only 18 months.






Late in the afternoon we watched Brown of U.S.A. put in a really impressive performance, clinically smooth, with nicely imposed out-side loops and an arrow-like eight point roll, the whole performance spoiled only by the Top Hat and Spin. Brown’s Phoenix 6, like Radcliff’s, O.S.60 FSR powered, was undoubtedly the fastest on the field.


Harald Neckar and Erich Gilik


So ended the `sorting-out’ round during which West Germany’s Harald Neckar experienced under-carriage failure on landing. Hanno Prettner and Wolfgang Matt were in the commanding positions with Prettner just ahead and Yoshioka from Japan held third place ahead of three very dose formation Americans Brown, Miller and Radcliff in 5th, 6th and 7th places.




Our own top man at this stage was Keith Maundrel, having just topped the psychological 4,000 point barrier to hold 14th place, while Terry Cooper was down at 21st spot and Mike Bone was left with a lot to do down at 65th place after a premature motor cut.


The lucky Champion


Round Two on Thursday dawned dark, overcast with intermittent rain and rumbles of thunder amid the distant hills and mountain peaks. Yet during the morning, flying conditions were ideal, with zero wind.
Terry Cooper put in a good flight with some very nice manoeuvres, but missed the landing circle completely in a rate against the stop watch which turned out to be a mistake anyway.


Gunter Hoppe from West Germany put in a smart and precise flight with fine positioning and in a style which seemed to strike the ideal balance between the ‘all-over-the-sky’ full bore merchants and the `coast-it-round-at-low-throttle’ style.


Israel team pilot Harowitz with plane Nasher

Hoppe’s technique, keeping the model within a fairly tight piece of airspace, yet using all the power of his big Webra Speed 60, resulted in an extremely attractive overall presentation notable for its sheer economy of movement.


Harald Neckar


Steady rain turned to downpour soon after recommencement of flying following the mid-day break. Rhett Miller of U.S.A. was caught in mid-flight and had to abort as all on the flight line at the time took a drenching.


Papa Dave


Flying commenced again after a two hour delay when we watched the Swede Kjellgren, who flew his Mach 1 in fine style. Yet, if the rain had at least eased, it still persisted, with gusty crosswinds, the worst of which, during a short period, was endured by our own Mike Bone and with a motor going sick part way through, it’s no wonder he was nowhere near his best.


Japanese plane transporter


A little later though, Hanno Prettner handled the rough air superbly, his new Curare design, an updated Super Sicroly with inverted Y dihedral tail like a Bob Cat racer and increased fin area, really tore up the air using a Webra Speed 60 matched• to a Webra tuned pipe muffler.


Marc Radcliff`s Phoenix 6


Matt, in the air almost immediately after Prettner, was equally impressive. The new Atlas design, somewhat bigger than Super Star, has a thicker wing, flies somewhat slower and uses a little less airspace than before. These two young men really are in a class of their own.




Harald Neckar, still down on his luck, experienced severe interference, and then, as the day’s flying came to a dose, Chris Sweatman came as dose as we’ve seen to actually flying an aerobatic schedule in the dark, as the low cloud rolling in, obscured the fast fading daylight.


Dave Brown with his wife


By the morning after the rain before (!), the mire around the huge marquee housing competitor’s working area, trade display and dining area had become at least manageable. Now, as Round Three commenced, ‘form’ became far clearer and a large crowd gathered to watch both Prettner and Matt for the sheer entertainment value.



Prettner was superb again, but Matt, immediately after, experienced strong interference which ruined the second half of his Figure M manoeuvre and then proceeded to screw the aircraft all over the sky, so that Wolfgang quickly landed the model to await the waveband to clear.
Meanwhile it was the turn of Kjellgren from Sweden again, smooth and precise, before Matt returned again, this time easily handling a strong crosswind and a touch of interference induced rudder twitch during his slow roll.




The wind now was strong and bumpy, but Yoshioka achieved a remarkable performance in the rough air, although his spin entry was poor.
Least affected by the wind though was Dave Brown’s high Speed Phoenix 6, the American performing in outstanding style in really blustery air conditions. Okomura of Japan, too, showed remarkable command of the wind, achieving a super crisp performance.


Guenter Hoppe and Guenther Metterhausen with Sultan


Torrential rain came again at the end of the lunchtime break, turning much of the airfield access and model pit area into a sea of mud. The two hour deluge was punctuated by a temporary respite sufficient only to fly three or four more competitors before the torrents sent judges, flight line workers and contestants scampering for shelter again.




Mike Bone and Team Manager Geoff Franklin, in action on the flight line, took the drenching this time, as they curtailed the flight.




With all hope of flying literally washed away for the day, the flight programme was rescheduled for an early start, 7 a.m. Saturday morning, so that first on Mike Bone, re-flying after his Friday afternoon drenching, really took full advantage of the still air conditions to find his true form.
By now, however, Wolfgang Matt and Hanno Prettner had complete command of the score board, Matt in pole position with a fairly comfortable lead over Prettner. Toshioka held third place but was not unassailable.




A good 4th round score could clinch it for him, but on his last flight, the motor cut during the Spin, costing him both Spin and Landing Approach points. Dave Brown from U.S.A. flying almost immediately after, rose like a champion to the opportunity with a flight which assured for him the 3rd place position in the final reckoning.




With three men in the top ten, the U.S.A. were team trophy winners, but only by a small margin over the three young men from Liechtenstein, Wolf and Norbert Matt (Norbert placed 7th) and Wieland Meir (30th), a situation which leaves one wondering how a state of a size only 62 sq. miles can produce such fine R/C pilots.
How did `we` fare? Keith Maundrel was top Briton, at 32nd place, ahead of Terry Cooper tied with Chris Sweatman of South Africa at 33rd, while Mike Bone was down at 39th place. Collectively, our team placed 1 1 th out of 26. Why so poor?


Naruke`s Nova


Well, it’s easy to make excuses for your own team, but it really is fair to say that our boys were as psychologically ill-affected as anyone by the severity of the interference experienced on the 27 MHz waveband, which certainly put them off their stroke.


Naruke`s Nova


In Britain, there really is very little on the waveband that one could genuinely identify as interference, whereas the attitude of continental European fliers to the situation tends to suggest that it is a way of life they’ve learned to live with.


Yoshioka`s Blue Angel


For instance, we watched one of the Yugoslav’s models, take off, climb upwind and execute the most violent snap roll we’ve ever seen, everything just came on at once. Yet the pilot simply regained control, repositioned downwind and went straight into the Figure M as though nothing had happened!


Renè Schumacher with helper and plane Condor


What was it like overall? Well, the standard of flying among the leaders was very high indeed, although the weather precluded the height of perfection seen at Gorizia. Continental European R/C aerobatics seem to be on the up, with a better overall standard than we’ve seen hitherto, while herein Britain we’re stagnating.


Yoshioka and Kato with Blue Angel


We could do better, and certainly those who flew for us this time have all done better, none of them reaching the standard seen at our team trials. More competition on the Continent is perhaps the answer, but cost of travel is of course a consideration.


Jan van Vliet with Boomerang


Model design brought nothing drastically new. No single design was prominently favoured and the only designs used in any numbers at all were Norman Page’s Mach 1, Yoshioka’s 1973 winner, the Mk. Blue Angel, and Prettner’s Super Sicroly.


Tore Paulsen with his Spitfire


Similarly, no individual brand of radio equipment held any commanding sway, although the American Pro-line (14) and the German Simprop (13) were the most popular.


Denis Chabert with Tempest


Only in the power department was there any decided preference, more than half the fliers (39) choosing the Webra Speed 60, usually with the new Mini-Vox Super muffler, although a number were fitted with the Webra tuned pipe and a considerable number used in-flight mixture control.


Benny Kjellgren, Teammanager Acke Johansson with plane Mach 1


After all the panic at the beginning of the year about the noise standards which the Swiss organizers threatened to apply for the meeting, no noise checks ‘were carried out.


Dave Brown with Phoenix 6, his wife as helper and TM Don Lowe


The hoped-for breakthrough in noise damping did not materialise, but many mufflers used were noticeably more effective than hitherto.


Benito Bertolani with his Maria and plane Kosmos


The new Mini-Vox Super with large expansion chamber is quite effective, the Japanese had some quite effective mufflers, and the Webra pipe seems quite a good one to use.


Ferdinand Schaden, his wife, helper and plane Condor 75


First prize for enterprise must go to Sim-prop. Fifteen minutes after the end of the competition, the words Weltmeister 1975 Simprop Alpha Contest Spezial were being nailed to the headboard on Simprop’s trade stand.


Stephansen with plane Maximum II, TM Folen and helper

Since no one can cut out individual letters that quick, it may be illustrating either excellent commercial presence of mind in pre-planning, or a manufacturer’s sheer confidence in his equipment!


Günter Hoppe, Bärmann, Günther Metterhausen and plane Sultan 5


So yet another World R/C Championship came to an end. For the winner, Wolfgang Matt, success after several times coming so near on previous occasions.

Harald Neckar and his Mephisto


For runner-up Hanno Prettner, disappointment again – and yet disappointment with its compensations, for there can be few figures on the international radio control scene more popular than this immensely likeable young man who has in the past overcome serious physical disability to achieve his present position.


Kurt Matke, TM Goedel and plane Olympia Flipper

For Dave Brown of U.S.A., a breakthrough on his very first appearance at a World R/C Championships, a situation of which world championship competitions are made. Long may it remain so.


Canadian Team – Kristensen, Hitchcox, Reusch and their planes


World Championship technicalities

Some interesting technical details from the recent aerobatic R/C Champs at Bern, Switzerland


Team Luxemburg, Paul Behm and Bertemes


Any World Championship or large International contest holds two quite separate areas of interest. There’s the obvious who-won, who-did-what aspect and then the analysis of the various technical approaches from various Nations to the problem of achieving the best model and the best performance.


Team Liechtenstein and their Atlas


Let it be said that rarely will one find such a spread of technical ability and competence as at a World R/C Championship – some of the people competing really are nowhere near basic beginner level, let alone World Championship class and much of this is reflected in the choice of equipment combinations which go to make up their flying machine.


Bengt Lundsröm with his plane DFH17


In last month’s Championship report, we touched briefly on equipment used and model trends. Radio equipment preferences are perhaps the immediate question that springs to mind and although there were no overwhelming preferences, an interesting trend was that towards the use of rate switches coupled in to the transmitter aileron and elevator controls to produce two amounts of full servo through for full control column movement – the object being smoother, softer control response where appropriate.

B.Policar and M.Merse with Champion


Matt, Prettner and Brown in 1st, 2nd and 3rd places all used them and Brown also had a roll button which would programme in a set amount of aileron throw appropriate to a slow rat’ for instance, leaving him free to concentrate on the rudder/ elevator control corrections through the manoeuvre.


Terry Cooper with Bulldo


Sixth place Mark Radcliff, like Brown using World Engines Expert Series radio also used this feature and all those using the new Kraft Signature Series gear ($800 if you can raise the mortgage or afford a divorce) had this feature plus the to confound the manufacturer’s efforts and swap carburettors – on this and other motors, sometimes resulting in rather odd combinations.


Yoshioka with his Blue Angel


Most popular glow plug was the Enya, in Nos. 3, 4 and 5 forms while there seems to be a swing to Glass fibre props. although one fascinating little twist was the Japanese use of hand carved props., beautifully fashioned in wonderfully light Cherry wood – about half the weight of a normal wood prop.


Bruno Giezendanner and his Scorpion


Positive pressure fuel pump systems are beginning to become popular after Yoshioka used the Yamada system to win at Gorizia, although strangely, it’s not the Yamada unit we encountered this time.


U.S. Team Mark Radcliff, Rhett Miller, Don McGovern, Dave Brown


Both Brown and Radcliff used the new O.S. 60 FSR coupled to a Perry fuel pump and large bore carb. to produce what to us certainly looked like the most powerful combination seen at Bern. Certainly their Phoenix 6 swept wing models were the fastest on the field, particularly Brown’s.




We saw only one model on the field equipped with inset ailerons, but one interesting trend discovered was the growing popularity of the all-flying tailplane, quite a number were seen.

Victory ceremony 1.Matt 2.Prettner 3.Brown


Retracting under-carriages were all but universal, most with direct mechanical servo drive, although the popularity of the pneumatic Rom-Air system shows perhaps that some are tired of adjusting linkages.




The big disappointment was the muffler situation. The threatened noise level tests (not carried out as it happened) failed to produce the hoped-for breakthrough, although some mufflers were quite effective.


The team ceremony

The Big Hattori muffler used by Naruke from Japan for instance seemed quite effective, and then there were the Webra pipes used with some Webra Speed 60 motors. These, though not drastically damping noise, were quite quiet.


Christian Schweizer and Acrostar


An additional complication here though is the use of mixture control which, although it may not be absolutely necessary, was certainly applied to all the Webra Speed 60s we saw at the Championships used in conjunction with the Webra tuned pipe.



Name Nation Model Radio Motor Retracts
1. W. Matt Liechtenstein Atlas Simprop Contest Spezial Webra Speed 60 Pro-Line
2. H. Prettner Austria Curare Simprop Contest Spezial Webra Speed 60 KDH
3. D. Brown U.S.A. Phoenix 6 World Engines Expert 0.5.60 FSR Goldberg
4. T. Yoshioka Japan Blue Angel Digi-Flight Enya 60X MK.
5. T. Okumura Japan Patricia O.S. Diamond 6GX 0.S.60 FSR MK.
6. M. Radcliff U.S.A. Phoenix 6 World Engines Expert 0.S.60 FSR Pro-Line
7. I. Kristensen Canada Saturn Pro-Line Super Tigre 60 ABC Rom-Air
9. N.Matt Liechtenstein Atlas Simprop Contest Spezial Webra Speed 60 Pro-Line
9. R. Miller U.S.A. Compensator Kraft Signature 7 Webra Pro-Line
10. G. Hoppe W. Germany Sultan 5 Signiature 7 Micro-Prop Professional Webra Speed 60 KDH
11. B. Kjellgren Sweden Mach 1 Kraft ’74 Webra Speed 60 Goldberg
12. I. Matsui Japan Cosai, Star Liner Micro Sports 6 Enya 60X Rom-Air
13. G. Bertolozzi Italy Kosmo 3 Pro-Line O.P.S.  Ursus 60 Original
14. H. Neckar W. Germany Mephisto Graupner Varioprop 12S OS.60 FSR Graupner
15. K. Matke W. Germany Olympia Flipper Graupner Varioprop 12S Webra Speed KDH
16. G. Werion Belgium Mixer-S Kraft ’72 Rossi M.K.
17. B. Giezendanner Switzerland Scorpion Pro-Line 7 Webra Speed 60 Giezendanner
18. E. Giezendanner Switzerland Scorpion Pro-Line 7 Webra Speed 60 Giezendanner
19. G. Naruke Japan Nova Futaba FP-6EN 0.S.60 MK.
20. B. Bertolani Italy Kosmo 3 Simprop OPS Ursus 60 Original
21. G. Hardy France Olympia Flipper “ Contest Spezial Simprop Webra Speed 60 KDH mini
22. R. Schumacher Switzerland Conder “Simprop  Contest Spezial” Webra Speed 60 Rom-Air
23. B. Lundstroem Sweden DFH 17 Pro-Line Webra Speed 60 Goldberg
24. F. Schaden Austria Condor 75 Digi-Fli 7 Webra Speed 60 Original
25. G. Reusch Canada Lightning B Kraft ’75 Kraft 61 Multicon
26. K. Holm Sweden Slybird Pro-Line 75 Webra KDH
27. R. Pasqualini Italy Mark Pro-Line OPS Rom-Air
28. W. Hitchcox Canada Saturn Orbit 5 Super Goldberg
29. K. Weixelbaumer Austria Super Sicrolly Simprop Contest Spezial H.P.61 Original
30. W. Meier Liechtenstein Super Star 3 Simprop Contest Spezial Webra Speed 60 Kolibri
31. A. Laffitte France Alize II Kraft KP7Z Kraft 61 KDH
32. K. Maundrel G. Britain Jemini 5 Kraft ’74 HP61 KDH
33. T. Cooper G. Britain Super Bulldog Prestige 6 OPS Ursus 60 MK.
34. C. Sweatman South Africa Lady Luck Skyleader TSX5 Ross 60 Rom-Air
35. C. Marincowitz South Africa Super Koas Pro-Line 6 O.S.60 FSR Pro-Line
36. J. Van Vliet Holland Boomerang Simprop Contest Spezial 0.S.60 FSR Pro-Line
37. 0. Chabert France Tempest Simprop Webra M.K. (main)
38. J. Tracy Australia Gemini Kraft Signiature O.S 60 FSR Rom-Air
39. M. Bone G. Britain Original Skyleader TSX7 Webra Speed 60 Violett Aero
40. E, Totland Norway Miss Norway 4 Graupner Varioprop 12 Webra Speed 60 Rom-Air / Goldberg
41. T. Paulsen Norway S Spitfire Futaba 6 Webra Speed Homemade MK.
42. B. Turner New Zealand Skymaster Sankyo 60 0S60 FSR MK.
43. B.Castenada Mexico Dirty Bird Kraft Signature Kraft 61 Multicon
44. P. Lagan New Zeafand Atlas Sankyo OS.60 FSR MK.
45. P. Stephansen Norway Maximum lt Kraft ’73 HP61R Rom-Air MK.
46. J. Lysaght Australia Mach I Futaba 6 Webra Speed 60 MK.
47. J. Van Beek Holland Miss Painless Polyprop Webra Speed 60 Goldberg
48. S. Policar Yugoslavia Demon Graupner Varioprop 12S Webra Speed 60 Goldberg
49. I. Olivier South Africa Super Angel Pro-Line 7 Webra Speed 60 Rom-Air
50. Y. Van Gompel Belgium Mixer-S Micro-Prop Professional Webra Speed 60 MK.
51. H. Dekkers Holland Edgar Simprop Contest Special Webra Speed 60 Fixed
52. E. Toft Denmark Profile 3 E.K. Logictrol 6 Webra Speed 60 Orient
53, G. Smithson New Zealand Cutlass Futaba 6 O.S. 60 FSR MK.
54. B. Policar Yugoslavia Super Sicrolly Graupner Varioprop 12S Webra Speed 60 Graupner
55.N.Bertemes Luxemburg Super Sicroly Multiplex Royal Webra Speed Rom-Air
56.L.Castenada Mexiko Blue Angel Kraft Signature Kraft 61 Multicon
57. P. Behm Luxemburg Altas Simprop Contest Spezial 0.S.60 FSR Rom-Air
58. D. O’Hara Ireland Clipper 3 Futaba Webra Speed 60 Rom-Air
59. J. Rojo Ara Spain Voltor Mutiplex Royal H.P.61 Fixed
60. M.Somenzini Argentina Mach I Futaba 6 H.P.61 Enya 4
61. R.Hurst Australia Gemini Futaba 6 0.S.60 FSR Fox L/R
62. B.Hedegaard Denmark Mach I MRC6 OS.60 FSR Rom-Air
63. S.Feiner Mexico Titi Pro-line Webra Speed 60 Pro-Line
64. 0.Harder Denmark Fuji Sankyo H.P.61 Enya 4
65. J. Beasley Ireland Tokyo Angel Skyleader TSX7 Webra Speed 60 Goldberg
66. J. Tonnar Luxemburg Super Star Mutiplex Royal Webra Speed 60 Goldberg
67. V. Amenduni Argentina Bell-Aire Pro-Line 5 0.S.60 FSR Rom-Air
68. M. Morse Yugoslavia Champion Multiplex Royal Webra Speed 60 Webra
69. A. Goldberg Israel Sha hat Kraft ’71 H.P.61 Pro-Line
70. N. Harowitz Israel Neshar Pro-Line 7 H.P.61 Fox R/C
71. D. Brushi San Marino Z16 Futaba 6 OPS 60 Ursus Fixed
72. A. Masetto Argentina Mach 1 E.K. Champion H.P.61 Rom-Air
73. H. Menary Ireland Manyana S Futaba 6 Webra Speed 60 Fox
74. G. Tereni San Marino Olnano Pro-Line Challenger 5 OPS 60 Ursus Fixed
75. R. Fombella Spain Super Kaos Multiplex Royal H.B.61 Goldberg
76. P. Constantinos Greece Snoopy Futaba 6 0.S.60 Gold Head Original

Text: RCM&e 11/12-1975
Images: Sky Aviations, Erich Gilik, Bernt von Boetticher, Modell

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