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)2.65
3.50 - Biscay
Freeboard front (m)1.20
Freeboard aft (m)1.05
Displacement (t)4 - 6
Fuel (l)2 x 325
Water (l)2 x 140
HullGRP
Number of boats475
  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.

Storö 31: image 1 of 2 thumb Storö 31: image 1 of 2 thumb
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.
Hull
Storö 31: image 1 of 2 thumb
Storbro Royal Cruiser 31
with original hull
When using newer powerful engines (TAMD41) it was shown that the ship tended to an unstable driving behavior. This was because the more powerful engines, while being lighter than the TAMD60, made the ship overtrimWhen using newer powerful engines (TAMD41) it was shown that the ship tended to an unstable driving behavior. This was due to the fact that the ship with stronger engines, with lower weight compared to the TAMD60, overtrimed at full speed (the same phenomenon occurred later with the Yanmar-equipped SRC 395). In addition, in this condition the hull was lifted so far in the aft from the water that the ship tended to tip slightly around the longitudinal axis. This behavior particularly affected the boats with flybridge.

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
To correct the problem, the hull was revised. With the construction number 2968 (1984) all Storebro Royal Cruiser 31 received the new hull. This was to be seen at the chines in the bow area and the water deflectors aft further downwards.

The new hull only brought advantages for the high-powered boats. However, the behavior of the hull in the sea became somewhat harder for all engines. The original hull allowed a softer ride.

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 1980 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.

2020-02-16
  Photos and images  
Storö 31: image 1 of 14 thumb Storö 31: image 1 of 14 thumb Storö 31: image 1 of 14 thumb Storö 31: image 2 of 14 thumb Storö 31: image 3 of 14 thumb Storö 31: image 4 of 14 thumb Storö 31: image 5 of 14 thumb Storö 31: image 6 of 14 thumb Storö 31: image 7 of 14 thumb
Storö 31: image 8 of 14 thumb Storö 31: image 9 of 14 thumb Storö 31: image 10 of 14 thumb Storö 31: image 11 of 14 thumb
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
 Engines 
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 ratio8,5:116,8:115,5:122,1:116:121:121:18,5:1
Displacement (l)5.205.665.803.175.483.593.595.00
Engine output (kw/(HP))136/(185)71 - 83/
(97 - 113)
129/(175)78/(106)89 - 147/
(121 - 200)
67 - 91/
(91 - 124)
67 - 91/
(91 - 124)
125/(170)
Rotations (1/min)40002500240040001800-28003000-360036004400
 
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 ratio8,5:116:121:121:121:116:116:116:1
Displacement (l)5.005.483.593.592.395.483.592.39
Engine output (kw/(HP))147/(200)103 - 169/
(140 - 230)
81 - 109/
(110 - 148)
121/(165)81/(110)112 - 184/
(152 - 250)
147/(200)96/(130)
Rotations (1/min)44001800-28003000-3600360038001600-280038003800

Volvo-data was taken from the Volvo Penta engine-database

* All variants of this engine
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
 Statistics 
storo31: image 1 of 1 thumbstoro31: image 1 of 1 thumb
  Technical development  
Changes from
s/n
Year Pic.
1975-1992
Doors and hatches with frame made of solid mahogany and filling.
New electrical distribution on the port side next to the driver's seat. The switches on the instrument panel are omitted.
Adriatic/Biscay: In 1976 the layout has been changed. The L-shaped bench was exchanged for a U-Dinette and separate bowcabin with V-berth.
The silver trims were replaced by wooden slats.
Adriatic/Baltic: Models without hardtop were equiped with a Radar-arch.
The cabin roof got a hatch for better ventilation. This was part of the deLuxe-option.
The plastic surfaces of the driving panel were covered with wood.
Adriatic: The area of the cockpit window, which was covered by the radar arch, is filled with an aluminum insert.
Baltic: The pannelling of the rear area in the aft cabin is now in mahogany instead of fabric covering.
Legend:

PDF-file available for download

PDF-file not available for download

PDF-file only available for registered owners

PDF-file only available for SRCC members

 Brochures, flyerLowHi
Royal Cruiser 31 - Brochure 1975gbRoyal Cruiser 31
Royal Cruiser 31 - Kit - Flyer 1975seRoyal Cruiser 31 - Kit
Royal Cruiser 31 Baltic - Brochure 1976seRoyal Cruiser 31 Baltic
Royal Cruiser 31 flybridge - Flyer 1980gbRoyal Cruiser 31 flybridge
Royal Cruiser 31 - Brochure 1980deRoyal Cruiser 31
Royal Cruiser 31 - Brochure 1984gbRoyal Cruiser 31
Royal Cruiser 31 - Brochure 1985gbRoyal Cruiser 31Royal Cruiser 31
Royal Cruiser 31 - Brochure 1987gbRoyal Cruiser 31Royal Cruiser 31
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 - 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
ManualsLowHi
Royal Cruiser 31 - Owner´s Manual1985se/enPDF - Download only for registered usersPDF - Download only for registered users
Complete brochuresLowHi
Storebro Bruks AB - Complete brochure 1978en
Storebro Bruks AB - Complete brochure 1985en
Storebro Royal Cruiser - Complete brochure 1990en
Storebro - Technical documentsLowHi
Storebro Royal Cruiser 31 - Adriatic section1975en
Storebro Royal Cruiser 31 - Baltic layout B-2610-31976en
Storebro Royal Cruiser 31 - Baltic section B-2611-01976en
Storebro Royal Cruiser 31 - Baltic sideview B-2609-31976en
Storebro Royal Cruiser 31 - Biscay layout B-22101975en
Storebro Royal Cruiser 31 - Biscay layout B-2266-31976en
Storebro Royal Cruiser 31 - Biscay sideview B-2267-31976en
RC 31 - Wiring diagrams (VP TAMD60)1977se
RC 31 - Wiring diagrams (VP TMD40) 0-5008-00181980se
RC 31 - Wiring diagrams (VP TMD40) B-2873-01977se
Royal Cruiser 31 - Transportdocument1975sePDF - Download only for registered users
Royal Cruiser 31 Adriatic - Test Report Volvo Penta TAMD 41A1986enPDF - Download only for registered users
Royal Cruiser 31 Adriatic - Test Report Volvo Penta TAMD 60C1984enPDF - Download only for registered users
Royal Cruiser 31 Biscay - Test Report Volvo Penta TAMD 40A (S/N 2573)1980enPDF - Download only for registered users
Royal Cruiser 31 Biscay - Test Report Volvo Penta TMD 40A (S/N 2430)1979enPDF - Download only for registered users
Technical brochures - ManualsLowHi
Chrysler 225 - Operating ManualenPDF - Download only for registered users
Ford 2704ET series with turbocharged engine - ManualnoPDF - Download only for registered users
Ford 2710 series with turbocharged engine - ManualnoPDF - Download only for registered users
Ford 27xx - Service ManualenPDF - Download only for registered users
Perkins Engines 4.108/4.236/(T)6.354(MGT) - Operators ManualenPDF - Download only for registered users
Perkins Engines 4.108/4.236/(T)6.354(MGT) - Operators ManualdePDF - Download only for registered users
Thornycroft T345 - Instruction BookenPDF - Download only for registered users
Thornycroft T345 - Repl. Parts ListenPDF - Download only for registered users
Twin Disc Marine Transmission MG-502 Workshop ManualenPDF - Download only for registered users
Volvo Penta MD21A/MD32A - ManualenPDF - Download only for registered users
Volvo Penta MD21A/MD32A - ManualsePDF - Download only for registered users
Volvo Penta TAMD40B MS3C - Manualse/en/dePDF - Download only for registered users
Volvo Penta TAMD41A/B MS4A - ManualenPDF - Download only for registered users
Volvo Penta TAMD60A/B, TAMD70C/D - ManualenPDF - Download only for registered users
Volvo Penta TMD40A, TAMD40A - ManualenPDF - Download only for registered users
Technical brochuresLowHi
Thornycroft T345 - Productflyeren
Twin Disc MG 502/MG 502-1 brochureenPDF - Download only for registered users
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 1977en
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
Multimedia documentsLowHi
Storebro Royal Cruiser1981
Storebro Royal Cruiser1981
Storebro Royal Cruiser1981
Newspaper articlesLowHi
Perfectest exhibition prototype - Storebro Royal Cruiser 311975
What a speed with diesel!1976
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