Close  Storebro Royal Cruiser 31 Adriatic/Biscay/Baltic


Storebro Royal Cruiser 31 Adriatic


Storebro Royal Cruiser 31 Biscay


Storebro Royal Cruiser 31 Baltic
Technical Data
Year of production1975-1991
L.o.a. [m]9.30
Beam [m]3.20
Draft [m]0.95
Height above waterline [m]2.25
2.55 - Biscay
Freeboard front [m]1.20
Freeboard aft [m]1.05
Displacement [t]4.00 - 6.00
Fuel [l]2 x 325
Water [l]2 x 140
Voltage [V]12
HullGRP
Number of boats480
DesignerWinfried H. Wilke
  Remarks  
The Storebro Royal Cruiser 31 was the smaller sister of the successful Royal Cruiser 34. At the same width it was about one meter shorter.

With the Storebro Royal Cruiser 31, the three variants Adriatic, Biscay and Baltic were offered for the first time.
  • Adriatic - The open version with large cockpit and without hardtop. Later built boats (the "de Luxe" version) were equipped with a radar arch.
  • Biscay - The first Biscay of Storebro was the bad weather variant of the Adriatic with hard top and sliding door. The sofa in the salon could be folded down to a bunk bed. The Biscay was also available with flybridge.
  • Baltic - The direct little sister of the well-known Storebro Royal Cruiser 34. Available with or without hardtop.

The original concept of the Storebro Royal Cruiser 31 only included the variants Adriatic and Biscay. Both versions based on the same deck shell. For the Mediterranean in particular boats with Biscay-hardtop but without sliding-door were built. Some customers also upgraded their Adriatic by using the Biscay-hardtop.

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First Storebro Royal Cruiser 31
Baltic based on Adriatic
Only because of the urging of a customer of Ivar Gustafsson an Adriatic was rebuilt to Baltic from boat builders of the yard, but not for the shipyard order, the shipyard management decided to develop a complete additional GRP deck shell for the model Baltic. The prototype of the Baltic was created with add-on parts made of wood.

The boat was completely made of GRP, apart from the mahogany made hardtop. On first boats the wooden parts were painted in the color of the gelcoat. Due to the feedback from the customers, the wood was clearly varnished in typical Storebro manner later.

Engines
For the Storebro Royal Cruiser 31, essentially the same motors were used as for the somewhat larger Storebro Royal Cruiser 34. So at the beginning, Volvo Penta MD32, Perkins and Chrysler engines were used. Due to strikes in England, the supply of Perkins engines was almost impossible. At this time, Volvo Penta launched the TAMD60A with 192 hp on the market. The TAMD60x series then replaced the Perkins engines.
The originally offered Volvo Penta MD32 were only offered with left turning propellers. It was different with the Perkins engines. Here in each case a left and a right-turning engine was installed. The right turning engines were marked by an additional "X" in the serial number (e.g. 354UX...). Later installed Volvo engines had suitable transmissions for left or right hand rotation.
By default the Storebro Royal Cruiser 31 was delivered with two engines and shaft drive. However, a few boats were also equipped with single engine and shaft drive.
Seven ships were equipped with sterndrive. Five of them received the Volvo Penta AQD40A with 124 hp. The engines were then coupled with 250 or 280 singleprop drives. 1983 a 31er with two Volvo Penta AQ200D V8 engines and 280-drive was delivered. Last ship was then 1983 a ship with two AQAD30 engines and the new DuoProp drive.

Layouts
Obviously, there are two layout options:
  • The first variant consisted of a living room with a large L-shaped sofa, whose back could be folded to produce a large bed in the bow. There was no spatial separation to the forecabin.
  • Boats from 1976 onwards had the layout with U-Dinett and V-berth in the bow known from the Storebro Royal Cruiser 34.
Equipment
From 1985, the Storebro Royal Cruiser 31 was also offered as a "de Luxe" version. The "de Luxe" package contained the following extra equipment: white hull and deck, mahogany on railing aft, plates with model name in mahogany - colour stripes on freeboard - extra skylight over galley - special colour upholstery - special bases for helmsman and navigator seat allowing them to swivel 360 degrees and with height adjustment (Adriatic and Baltic only) - extra removable navigator´s seat (Biscay only) - spring bollards amidships - mahogany on horizontal surface inside front windows - extra glassholder at helmsman´s position - on Adriatic and Baltic, extra lights on sidepanels to port and starboard behind helmsman and navigator seats - if radar mast is fitted the lights will be installed in this - on Biscay, extra cockpit lights are installed under roof behind the sliding door.

Hull
Storö 31: image 1 of 2 thumb
Storbro Royal Cruiser 31
with original hull
When the first Storebro Royal Cruiser 31 were fitted with flybridges, it became apparent that the ship tended to have unstable handling. This manifested itself in the fact that the higher centre of gravity made the ship more unstable laterally and it oscillated more easily around the longitudinal axis when the weight was shifted. At full speed, the ship tended to overtrim (the same phenomenon later occurred with the SRC 395 equipped with Yanmar engines).

Storö 31: image 1 of 2 thumb Storö 31: image 1 of 2 thumb Storö 31: image 1 of 2 thumb
Modified hull of the Storebro Royal Cruiser 31
As neither the shipyard nor the customers were satisfied with the situation, the hull was reworked. Previously produced ships were reworked and with construction number 2968 (1984) all Storebro Royal Cruiser 31 received the new hull. This could be recognised by the tear-off edges in the bow area and the water deflector that was pulled further down aft. The hull lost a little of its rounded bulkhead characteristic, became wider aft under water and resembled a V-hull a little more.
The new hull essentially brought advantages for the ships equipped with a flybridge.

Miscellaneous
  • The Royal Cruiser 31 was made with gelcoat in a light shade of yellow. This was also available for the Royal Cruiser 40. At the presentation of the prototype at the Hamburg-fair, the visitors gave a negative feedback concerning the originally white gelcoat.
  • The Royal Cruiser 31 was originally also offered with one engine. This was a measure to compete successfully with a competing model whose merits should be the very low price. In direct comparison, the much-quality processed Royal Cruiser 31 turned out as the better offer.
  • The brochure of 1984 shows the old layout in the bow of the 31 Biscay when looking into the deck saloon.
  • The anchor-catapult shown in the brochure is on a Royal Cruiser 38.
  • The German Wasserschutzpolizei had a modified Biscay named "Warder" on duty. The boat was equipped with twin TAMD 60B.

Licensed boat building
After the start of cooperation with Libya to build up local water sports 15 Royal Cruiser 31 were delivered from Sweden. 65 Royal Cruiser 31 were built later in Libya under production license. These ships were intended exclusively for the Libyan market.

2021-03-18
  Photos and images  
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Building and testing
Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb
Storebro Royal Cruiser 31 Baltic with single engine
Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb
Storebro Royal Cruiser 31 Biscay modified for the German Wasserschutzpolizei (S/N 2720 - 1981)
Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 12 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 14 of 14 thumb
Custom-built boats
Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb Storö 31: image 13 of 14 thumb
Additional Photos
In some cases, further images of registered ships are available for registered users.
up Enginesminimize 
EnginesChrysler
225LM318BW
Thornycroft
T 345
Perkins
T6.354 MGT
Volvo Penta
MD32A
Volvo Penta
TAMD60A
Volvo Penta
TMD40A
Volvo Penta
AQD40A
Volvo Penta
BB225 D/E/F
Production1970-19771976-19781976-19851977-19851977-1986 *
FuelDieselDieselDieselDieselDieselDieselDieselPetrol/Gasoline
Stroke44444444
No. of cylinders86666668
Bore[mm]99.3098.0098.4090.0098.4392.0092.0095.00
Stroke[mm]8412512783120909088
Compression ratio8.5:116.8:115.5:122.1:116.0:121.0:121.0:18.5:1
Displacement[l]5.205.665.803.175.483.593.595.00
Torque[Nm]
Engine output[kw/(HP)]136/(185)71 - 83/
(97 - 113)
129/(175)57 - 78/
(78 - 106)
89 - 147/
(121 - 200)
91/(124) ***67 - 91/
(91 - 124)
165/(225)
Rotations[1/min]40002500240040001800-28003000-360036004400
Weight[kg]617 ****395750440
 
EnginesVolvo Penta
AQ200D
Volvo Penta
TAMD60B
Volvo Penta
TAMD40A
Volvo Penta
TAMD40B
Volvo Penta
AQAD30A
Volvo Penta
TAMD60C
Volvo Penta
TAMD41A
Volvo Penta
TAMD 31A
Production1977-19861978-19831980-19851983-19861983-19861983-19871986-19891986-1991
FuelPetrol/GasolineDieselDieselDieselDieselDieselDieselDiesel
Stroke44444444
No. of cylinders86664664
Bore[mm]95.0098.4392.0092.0092.0098.4392.0092.00
Stroke[mm]881209090901209090
Compression ratio8.5:116.0:121.0:121.0:121.0:116.0:116.0:116.0:1
Displacement[l]5.005.483.593.592.395.483.592.39
Torque[Nm]625
Engine output[kw/(HP)]147/(200)103 - 169/
(140 - 230)
81 - 109/
(110 - 148) ***
116/(158) ***81/(110)112 - 184/
(152 - 250)
147/(200)96/(130)
Rotations[1/min]44001800-28003000-3600360038001600-280038003800
Weight[kg]750485475680 ****465
* All variants of this engine
*** Power at the propeller shaft
**** Weight without gearbox
Attention:
The values given in the motor diagrams below are measured values of individually equipped ships. The measured values can vary depending on the equipment as well as the wind and temperature conditions. These values do not indicate a binding property, but can only serve as indications.
storo31: image 1 of 1 thumb
As a registered user, depending on the type of boat, you have access to further diagrams regarding consumption, range and noise level.
up Statisticsminimize 
storo31: image 1 of 1 thumbstoro31: image 1 of 1 thumb
As a registered user, you have access to further diagrams on hull colours, layout variants, type of wood used and production figures per year, depending on the type of boat.
  Technical development  
As a registered user, you have access to the list of changes in production, depending on the type of boat.
Legend:
pdf

PDF-file available for download

pdf grey

PDF-file not available for download

pdf grey register

PDF-file only available for registered users

pdf grey register

PDF-file only available for registered owners

pdf srcc

PDF-file only available for SRCC members

 Brochures, flyerLowHi
Royal Cruiser 31 - Brochure 1975gbRoyal Cruiser 31
Royal Cruiser 31 - Kit - Flyer 1975seDownload only for registered users
Royal Cruiser 31 Baltic - Brochure 1976seDownload only for registered users
Royal Cruiser 31 flybridge - Flyer 1980gbDownload only for registered users
Royal Cruiser 31 - Brochure 1980deRoyal Cruiser 31
Royal Cruiser 31 - Brochure 1984gbRoyal Cruiser 31
Royal Cruiser 31 - Brochure 1985gbRoyal Cruiser 31Download only for registered users
Royal Cruiser 31 - Brochure 1987gbRoyal Cruiser 31Download only for registered users
PricelistsLowHi
Storebro Bruks AB - No. 49 - Pricelist 1976seNot for public download
Storebro Bruks AB - No. 50 - Pricelist 1976se/enNot for public download
Storebro Bruks AB - No. 51 - Pricelist 1977seNot for public download
Storebro Bruks AB - No. 53 - Pricelist 1978seNot for public download
Storebro Bruks AB - No. 55 - Pricelist 1979seNot for public download
Storebro Bruks AB - No. 59 - Pricelist 1980seNot for public download
Storebro Bruks AB - No. 60 - Pricelist 1981seNot for public download
Storebro Bruks AB - No. 63B - Pricelist 1983seNot for public download
Storebro Bruks AB - No. 65 - Pricelist 1984seNot for public download
Storebro Bruks AB - Nr. 67B - Pricelist 1985seNot for public download
Storebro Bruks AB - No. 69 - Pricelist 1986seNot for public download
Storebro Bruks AB - Nr. 70 - Pricelist 1986se/enNot for public download
Complete brochuresLowHi
Storebro Bruks AB - Complete brochure 1978enPDF - Download only for registered users
Storebro Bruks AB - Complete brochure 1985enPDF - Download only for registered users
Storebro Royal Cruiser - Complete brochure 1990en
ManualsLowHi
Royal Cruiser 31 - Owner´s Manual1985se/enDownload only for registered ownersDownload only for registered owners
Storebro - Technical documentsLowHi
Storebro Royal Cruiser 31 - Adriatic section1975enNot available for public download
Storebro Royal Cruiser 31 - Biscay layoutB-22101975enNot available for public download
Royal Cruiser 31 - Transportdocument4-5050-00011975seDownload only for registered users
Storebro Royal Cruiser 31 - Baltic layoutB-2610-31976enNot available for public download
Storebro Royal Cruiser 31 - Baltic sectionB-2611-01976enNot available for public download
Storebro Royal Cruiser 31 - Baltic sideviewB-2609-31976enNot available for public download
Storebro Royal Cruiser 31 - Biscay layoutB-2266-31976enNot available for public download
Storebro Royal Cruiser 31 - Biscay sideviewB-2267-31976enNot available for public download
RC 31 - Wiring diagrams (VP TAMD60)1977seNot available for public download
RC 31 - Wiring diagrams (VP TAMD60A) ST:B OriginalB-28711977seNot available for public download
RC 31 - Wiring diagrams (VP TMD40)B-2873-01977seNot available for public download
Royal Cruiser 31 - Main switch panel connection4-5008-00021978enNot available for public download
SRC 31 - Fuse- and cableno.list31007791979deDownload only for registered users
RC 31 - Wiring diagrams (VP TMD40)0-5008-00181980seNot available for public download
Royal Cruiser 31/34 - Steel cradle dimensions2-5050-00091983seDownload only for registered users
Storebro - Test ReportsLowHi
Royal Cruiser 31 Biscay - Test Report Volvo Penta TMD 40A (S/N 2430)1979enDownload only for registered users
Royal Cruiser 31 Biscay - Test Report Volvo Penta TAMD 40A (S/N 2573)1980enDownload only for registered users
Royal Cruiser 31 Adriatic - Test Report Volvo Penta TAMD 60C1984enDownload only for registered users
Royal Cruiser 31 Adriatic - Test Report Volvo Penta TAMD 41A1986enDownload only for registered users
Technical brochures - ManualsLowHi
Chrysler 225 - Operating ManualenDownload only for registered owners
Ford 2704ET series with turbocharged engine - ManualnoDownload only for registered owners
Ford 2710 series with turbocharged engine - ManualnoDownload only for registered owners
Ford 27xx - Service ManualenDownload only for registered owners
Perkins Engines 4.108/4.236/(T)6.354(MGT) - Operators ManualenDownload only for registered owners
Perkins Engines 4.108/4.236/(T)6.354(MGT) - Operators ManualdeDownload only for registered owners
Thornycroft T345 - Instruction BookenDownload only for registered owners
Thornycroft T345 - Repl. Parts ListenDownload only for registered owners
Twin Disc Marine Transmission MG-502 Workshop ManualenDownload only for registered owners
Volvo Penta MD21A, MD32A, AQD21A, AQD32A - Workshop ManualdeNot available for public download
Volvo Penta MD21A/MD32A - ManualenDownload only for registered owners
Volvo Penta MD21A/MD32A - ManualseDownload only for registered owners
Volvo Penta TAMD40B MS3C - Manualse/en/deDownload only for registered owners
Volvo Penta TAMD41A/B MS4A - ManualenDownload only for registered owners
Volvo Penta TAMD60A/B, TAMD70C/D - ManualenDownload only for registered owners
Volvo Penta TMD40A, TAMD40A - ManualenDownload only for registered owners
Volvo Penta TMD40A, TAMD40A - Workshop ManualenNot available for public download
Technical brochuresLowHi
Thornycroft T345 - Productflyeren
Twin Disc MG 502/MG 502-1 brochureenNot available for public download
Volvo Penta - Program 1989en
Volvo Penta TAMD 40A - Productflyeren
Volvo Penta TAMD 40B - Productflyeren
Volvo Penta TAMD 60B - Productflyeren
Volvo Penta TAMD 60C - Productflyerde
Volvo Penta TMD 40A - Productflyeren
ReviewsLowHi
Neptune-Nautisme - Royal Cruiser 31 - Review 1976frPDF - Download only for registered users
MBY - Royal Cruiser 31 - Review 1977enPDF - Download only for registered users
Australian Sea Spray 02/82 - Royal Cruiser 31 - Review 1982auPDF - Download only for registered users
Australian Boating 02/82 - Royal Cruiser 31 - Review 1982auPDF - Download only for registered users
Båtliv - Royal Cruiser 31 - Review 1982noPDF - Download only for registered users
Multimedia documentsLowHi
Storebro Royal Cruiser1981Download only for registered users
Storebro Royal Cruiser1981Download only for registered users
Storebro Royal Cruiser1981Download only for registered users
Newspaper articlesLowHi
Perfectest exhibition prototype - Storebro Royal Cruiser 311975
What a speed with diesel!1976Download only for registered users
Praktisk Båtägande - Storebro 31 Baltic2020Download only for registered users
Dagens PS - Storebro 31 - Swedish quality boat that stands up2021Download only for registered users
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