Thulin 6 cyl airplane engine. Ref 1
Thulin 6 cyl airplane engine. Ref 1
Technical museum. Air engines.
Text and pictures Björn Bellander. Pictures current 2010.
Back  Swedish version  Official website
Created 120315
Updated
2021-06-15
© Björn Bellander

 

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Page 1

Swedish version

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Twin Wasp
About all engines, read info picture.

Twin Wasp copy produced in Trollhättan. Ref 49
Twin Wasp copy produced in Trollhättan. Ref 49
Engine for  DC-7 at Svedino museum. Ref 1
Engine for DC-7 at Svedino museum. Ref 1
Twin Wasp engine copied i Sweden. Ref 1
Twin Wasp engine copied i Sweden. Ref 1
Read info picture. Ref 1
Read info picture. Ref 1
Twin Wasp. Read info picture.  Ref 1
Twin Wasp. Read info picture. Ref 1
Read info picture.  Ref 1
Read info picture. Ref 1
Info about engines. Ref 1
Info about engines. Ref 1


Links

About rotation engine

Pratt Whitney
Twin Wasp R1830. Engine for  DC7. 1200 ps. Ref 1
About air engines in Sweden during WWII
Read more about B17

Sweden hade several aircraft industries before WWII. They built planes mostly of wood. Axel Wennergren. the man with Elektrolux and the refrigerator and Wenner Gren Center, realized 1937, that such a central company was needed. Bofors/Nohab were merged and Saab Aeroplane in Trollhättan was established.

ASJA had formed a company in Linköping and bought Sparmann in Stockholm at Lidingö offering Sparmann people to get job at Saab. Later ASJA in Linköping bought Swedish Aero which was owned by Bücker 1932, and Saab merged into the industrial group Bofors/Nohab. Nohab, the company that produced locomotives and engines for boats, started an air craft division in order to get engine license for production. The Nohabs engine division became later Swedish Aircraft engines.

It was supposed that ASJA should cooperate with the Bofors group, but it was difficult and now it became discussions to merge these into one company. This ended up with the name SAAB. This firm got the exclusive right to deliver aircrafts for the Swedish defence. SAAB now heritage the order for B17 from ASJA.

Furthermore Götaverken had an aircraft division. Here Bo Lundberg working designing the J22 Swedish fighter though he did it in America. Saab and ASJA agreed together to cooperate with several engineering schools from which the pupils were recruited. The first mission was to manufacture Ju 86 or in Swedish B3, on license. For this German engineers came to Sweden  for help, but when war started they went home again.

The engine for B3 was first built in Poland, was a 9 cylinders star engine, from the beginning an English design. This engine were later license built for Swedish B17.

Later during the buying of aircrafts from America, 50 engineers came to teach the Swedes assembling these aeroplanes. With the help of these the Swedish dive bomber were developed. Together with this it will be mentioned that A.J. Andersson who has made important profound i Swedish aircraft constructions as leader for both B17 and J21.

A prototype was already 1940 tested and started to be delivered 1941 to 1944. The American engineers had to go home when America joined the war.

But now the Swedes could handle the building by them self. The problem with all aircrafts which Sweden bought there were no engines with enough power.

For the B17, Saab first had to mount a license built English engine, Bristol Mercury which only gave 980 ps. Later they got the Pratt&Whitney which gave 1065 ps. Also the Italian Piaggio PXI giving 1020 ps. As a luck the B17 never needed to fight against the fighters from Germany and England. They had at this time 1400 ps.

When totally, there were 322 B17 built, in different version, the most famous dive bomber Ju 87 had been withdrawn to the lines behind. B17 was though a very successful and safe design. In the case that this fighter had got an engine with between 1500 to 2000 ps the plane had been a very powerful dive bomber.

Saab B17 was in active service up to 1948. During the period 1947 to 1953 several were sold to Ethiopia and 2 to Finland. Several planes were bought by private owners and rebuilt for target towing.

Sweden which at the outbreak of war only had one wing in Stockholm area equipped with outdated English Gloster Gladiators, put much effort on all kinds of fighters that eventually could act as a fighter. B17 was a good member of this because it's project planning had started already in late 1930. On the other hand today one can wonder it might have been better with a fighter.

About the engine for J22.
Read more about J22

The engine became just the same as in B17 and Seversky J9. It was a two row star engine with 1065 ps. This gave the plane a kg/ps which was better than all planes in Europe, in spite of there engines with 1400 ps.

Lundberg had of course looked at J9 and its engine. This was Nohab on the way to copy. This work was not ready for production for J22 until 1944. Where to find engines till this time?

Germany had from France as war booty taken several engines of the type TWC3, the same as Jeversky were equipped with. The first 113 B17 were equipped with these war booty engines. These engines were payment from Germany for iron an special steel.

No one could make business with Germany as their money was totally worthless on the world market.


Page 2

Swedish version

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Slidmotor

 Info om slidmotor på Malmö Tekniska Museum. Ref 1
Info about sleeve engine at Malmö Technical Museum. Ref 1
Technical myseum Malmö. Airplane engines. Ref. 1
Technical museum Malmö. Airplane engines. Ref. 1
Technical myseum Malmö. Airplane engines. Ref. 1
Technical myseum Malmö. Airplane engines. Ref. 1
Bristol sleeve valve engine ordered by Sweden but never delivered. Picture from my visit at Duxford. Ref 1
Bristol sleeve valve engine ordered by Sweden but never delivered. Picture from my visit at Duxford. Ref 1

Links
Slidmotor

Radial-bi-rotary
Technical museum Malmö. Airplane engines. Ref. 1
Technical museum Malmö. Airplane engines. Ref. 1
Air craft engine from 1937 - 1939.

This sleeve 9 cylinder valve engine gave 930 ps. Cylinder rotation was reverse the propeller.

The engine was constructed by the professor in combustion technical Paul Åberg at Malmö Technical High School. This prototype, only one copy was made, was meant for those fighters that were on the way to be built in Sweden. This engine was built by Nohab in Trollhättan.

About the picture of Bristol engine.
Bristol Centarus was a 18 cylinder sleeve valve and planned in two rows. This engine was constructed during great difficulties but gave over 2400 ps in it's last version. As always during the time there were always various versions and ps.
The production was so complicated that instead the Griffon engine was instead chosen. This one was from the beginning a Merlin engine. 1944 when the Centaurus were produced they were mounted in Hawker Tempest in order to hunt the V2 rockets. Tempest got also a Napier Sabre star engine with 6x4=24 cylinders configured in H. This engine gave 5500 ps. At Sinsheim museum there is a Russian engine diesel engine with 42 cylinders configured as a star engine in 6x7. This was the most powerful engine during WWII. Sweden had in the beginning ordered the 14 cylinder Bristol engine but England could not deliver. This was the reason why the Swedish B18 got a Swedish made copy of Twin Wasp with 1065 ps. The company which was created for this is today named Volvo Aero.

More about sleeve valve engines see also Koping and Technic at grandfather's time museum.
 


Page 3

Swedish version

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Jet motorer
  J29 jet engine at museum. Ref 49
J29 jet engine at museum. Ref 49
Info picture at the museum. Ref 1
Info picture at the museum. Ref 1
Burner on the J29 jet engine. Ref 1
Burner on the J29 jet engine. Ref 1
Info note about J29 jet engine. Ref 1
Info note about J29 jet engine. Ref 1

Links

Jet engine story
J 29 engine at the museum. Ref 1
J 29 engine at the museum. Ref 1
About SAAB J29.
Read more about Swedish fighters

Saab J29 was projected 1945. Serial production started 1950 and the last aircrafts were delivered 1956.

It first replaced the A21 propeller version 1953. The design of the J29 is from the beginning a German project for a arrow wing fighter, Messerschmitt P1101. The winning forces shared and took what they wanted from the defeated Germans. The project P1101, a Swedish engineer from SAAB got (bought) drawings in Switzerland and reported in shady ways. These were handed over to the border of SAAB. Lars Brising at that time chief designer at SAAB put several suggestions with this as the base.

In this way it became a J29 of the Messerschmitt beginning project P1101. But even in America the first jet air crafts were built on this project.

The Swedish J29 Barrel became the national pride in Sweden. In spite of this hidden origin the J29 became a very potent fighter for it's time and was in service till 1965. 661 copies were build.

The Swedish pilots were not used to these advanced aircrafts and there were high efforts on education. With this new kind of flying 230 J29 were crashed  and many of them with the lost of the pilot. These accidents were believed to be caused by the fact that there were no 2 seat school version.

For  this time the project was complicated that in Sweden there was no qualified Swedish test pilot to find. Saab hired an English pilot, Bob Moore for this job. The first take of was 1948. The J29 was well known for at least two things. World record on track in speed and service in Kongo.

This would be good for Swedish history. Lucky enough there are several of these aircrafts left for enthusiast with money to be put in order again. Up to this day the Swedish people speaks with a proud voice about J29 Barrel which made the Swedish air industry well known in the world.

At one fighter visit in Italy one J29 was damaged and it was presented to Italy because it was to expensive to repair in place.

The Swedish Air Force leader didn't realized the future value of old historical fighters. Shoot or fire them in pieces. I can never understand that it was a better schooling for pilots to shoot at an old fighter on ground. This was only showing the way of thinking at that time. If enough copies could have been stored the air force Museum today 2007 could have money enough to have an air force museum of a high level.

Only one country bought J29 and it was Austria. They bought used aircrafts which got a complete renovation. The Austrian pilots were trained in Sweden.

In Sweden there was for a long time no flying Barrel. When the old mechanics and engineers realized this they got money from SAAB, firms and donations. to put a good copy in order. This was a job that was completed 2007.

Concerning engines both Germany and England were working on the same level with jet engines. The greatest problem was that there were not yet heat resistance material fro the industry. There were two types of jet engines. One with large diameter for compressor and one row. That's why the J29 had a big diameter for the engine.

This type can be recognized for the big "stomach".  The other model , which later became the most used had a compressor in several steps. Now the engine got a smaller diameter but instead total length was larger. Sweden also wanted to create their own jet engine industry. This why license were bought for the right ti build the engine for Vampire, Goblin from England.

This engine was developed for a variant for J29, J33 and later A32 Lansen. J28 came to Sweden with three copies flown to wing F13 Norrköping. The were flown from England by Swedish pilots. Another 2 were also on the way but had to wait in Germany while refueling and for better weather. They arrived a few days later. On of these planes got Swedish id number 28001 and is on display at Swedish Aircraft museum.

When these planes were taken out of service after 22 years, about 50 were sold to Austria and Dominican republic.


Page 4

Swedish version

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Motorer WWI
 Another view of the Mercedes engine. Ref 1.
Another view of the Mercedes engine. Ref 1.
Thulin D-motor delvis kopia av Mercedes 160 hk. Ref 1
Thulin D-motor delvis kopia av Mercedes 160 hk. Ref 1
Info about  Thulin E-engine. Ref 1
Info about Thulin E-engine. Ref 1
Info history of Enoch Thulin. Ref 1
Info history of Enoch Thulin. Ref 1
9 cyl rotation engine produced at Thulin. Photo from former Skokloster museum. Ref 1
9 cyl rotation engine produced at Thulin. Photo from former Skokloster museum. Ref 1
Copy of the 160 hp Mercedes engine built by Thulin/Vabis in Södertälje. Ref 1
Copy of the 160 hp Mercedes engine built by Thulin/Vabis in Södertälje. Ref 1
About engines for airplanes.

Thulin and Ask decided to start a new company, AVIS, Aeroplan Yard in Skåne. The meaning was to build a modern airplane. The difficulties with this was that they hadn't any engine and no such was in sight to buy. The only was was to copy an existing one. It should be a good idea for business.

Hugo Sundstedt had bought one Farman plane, but it was held in custom. This aero engine should later be a good help for copying. Enoch Thulin who at this moment had changed his first name to the way of spelling in Latin. Through money help from Gustav Dalén, Thulin now went to Paris twice 1913-14. 

Several problems should now be solved through this visit. Furthermore during his second journey he got an offer to buy one Morane-Saulnier plane. This unit was much up to date compared with Bleriot XI.

Because of the strained relations between France and Germany he had to travel over Switzerland to get into France. Their he found a ready made plane but the buyer had jumped off. Enoch got the opportunity to buy this with a strong reduced price. He later flew this plane home to Sweden 1914.

The Sundstedt Farmanplane's problems were now solved from the custom by Swedish state because of the war. Sundstedt had crashed this plae at delivery and was soon crashed again and sent to AVIS for reparation. Now Enoch had another engine which he took the opportunity to measure and decide what kind of material and others. He had already a manufacturer license.

The plane which AVIS earlier had decided to build was now temporarily put away as Thulin had the Morane-Saulnier ready for show. Now a very intensive period began to start production of engines. Furthermore Avis started to copy this last plane. All this demanded new working areas and also new leading employers. The company AVIS was now reconstructed till AETA and got financial support from Gustav Dalén and the new company Enoch Thulin Aeroplane factory started.
160 hk Thulin/Scania/Mercedes 6 cyl engine. Ref. 1
160 hk Thulin/Scania/Mercedes 6 cyl engine. Ref. 1
Vabis in Södertelge had got the mission to copy the engine mounted in the Albatross.
It was a Benz/Mercedes 6 cylinders straight engine giving 160 hp. This plane had been left in Sweden just before the war broke out. The 160 hp engine was later produced by AETA in a new design. It got the name Thulin E. This utilized when Södertelge Works gave up this kind of production.

In the same time when this selling happened Thulin started the new Flying school at Ljungbyhed 1915. Enoch Thulin had now gathered around himself highly qualified industrial men. He had in his company more scientists than L.M. Ericsson. This was a very exemplary model in order to develop and build engines and airplanes.


Page 5

Swedish version

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Steam engine for ships

Info about this angle steam engine. Ref 1
Info about this angle steam engine. Ref 1


Links

SS Per Brahe

Sjohistoriska museet
Angle steam engine. Ref 1
Angle steam engine. Ref 1
Angle Steam Machine.

O.E. Carlslund 1809-1884. Steam-engine for propeller ships.

This construction was awarded at World Fair in Paris 1856 with Grand Prix. This kind was often been inbuilt for freighters working on archipelagoes as lakes Vänern and Vtttern. The kind had often only 2 cylinders.

Links for other military sites in this website.
Pansarmuseum SwedenBrooklands museum England Duxford museum England
Sinsheim Air part  Robot museum Sweden  Soderhamns Air museum
Thulinroom Landskrona Svedino Flygmuseum  Hassleholm vehicle museum  Malmkoping vehicle museum Hannover Latzen Air museum  Swedish Submarines

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Pictures from the following owners have been used in bjorns-story.se with the appropriate allowance:
Referece 1: © Björn Bellander  bjorn.bellander(at)telia.com

Referens 48: ©Picture from website.
Referens 49: ©Picture from Wikipedia.
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