J Prop Leaflet g2f2h
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Why Jprop? - a brief history
J PROP MARINE PROPELLERS TYPE A – HUB 63
TYPE B – HUB 83
Two Blade
Three Blade
Three Blade
Dia.
£
Dia.
£
Dia.
£
13” 14” 15” 16” 17” 18”
1295.00 1325.50 1355.00 1386.00 1417.00 1447.00
13” 14” 15” 16” 17” 18”
1516.00 1560.00 1607.00 1652.00 1699.00 1744.00
17” 18” 19” 20” 21” 22”
2178.00 2315.00 2361.00 2407.00 2467.00 2513.00
For the last 30 years, feathering propellers have been the most efficient, all-round, drag reducing propeller for sailboats. The best known make of feathering propeller is the MaxProp which has dominated the
TYPE C – HUB 93
TYPE D – HUB 116
TYPE E – HUB 145
market since being introduced in the 70’s and was at this time considered to be state of the
Three Blade
Three Blade
Three Blade
art design. MaxProp is still sold today in its original form with some minor modifications,
Dia.
£
Dia.
£
Dia.
£
20” 21” 22” 23” 24” 25”
2900.00 2970.00 3016.00 3061.00 3107.00 3153.00
24” 25” 26” 27” 28” 29” 30”
4745.00 4859.00 4859.00 4974.00 5088.00 5202.00 5316.00
31” 32” 33” 34” 35” 36” 37” 38”
8546.00 8699.00 8851.00 9004.00 9255.00 9445.00 9850.00 10252.00
such as external lubrication. It was in the late 80’s in Solbiate Olona Italy, that two companies; Cober srl (ltd) specialists in CNC technology and Marine Propeller set out to address what improvements could be made to this older design of feathering propeller that had, what were to them, inherent deficiencies.
SAILDRIVE A – 63 HUB
SAILDRIVE A – HUB 64
SAILDRIVE B – HUB 83
Two Blade
Three Blade
Three Blade
Dia.
£
Dia.
13” 14” 15” 16” 17” 18”
1423.00 1455.00 1485.00 1515.00 1546.00 1576.00
13” 14” 15” 16” 17” 18”
1645.00 1690.00 1737.00 1782.00 1828.00 1874.00
ANODE WITH BOLTS Propeller Type
£
£
Dia.
£
15” 16” 17” 18” 19” 20” 21” 22”
1848.30 1917.00 1995.00 2143.00 2261.00 2379.00 2458.00 2556.00
ANODE
KEY KIT
£
Their objective was to produce a factory “permanently assembled” feathering propeller using CNC machining technology. In order to achieve this, the Jprop was designed to meet the following criteria:
Installation rather than assembly of prop on the shaft. Pitch is externally adjustable and provides a clear base-line from which to adjust the prop to the specific boat. All components are CNC machined to tolerance, allowing free movement and no need for the to adjust components.
£
TYPE A/B 17.00 35.00 45.00 29.00 51.00 TYPE C 22.00 49.00 56.05 TYPE D/E 25.00 Prices do not include VAT – Delivery: £30 ex works Italy
Deacons Boatyard, Bursledon Bridge Southampton, SO31 8AW
Tel 02380 403 944 Fax 02380 404 509
email [email protected] website www.calibramarine.com
Provide external lubrication. Designed to reduce wear.
In 1993 a US patent was ed on which today’s J Prop is based. (see US patent 5232345 @ www.uspto.gov)
Design Features
Jprop uses only helical (or continuously engaged) gears. Resulting in two distinct advantages:
Helical Gears
Differentially Geared Pitch Adjustment
The blades of the propeller will have identical pitch at all times. Helical gears have a large area producing more strength and less wear.
The pitch setting is determined by the amount of rotation the planetary gears are allowed by the internal stop in the adjustable tail-cone. As the shaft (C) and the drive gear (B) rotate clockwise, the planetary
gears (G) rotate the blades (F). The pitch gear (E) rotates counter-clockwise in this differential system. The housing remains stationary until the blades and pitch gear have rotated to the internal stop and therefore the pitch setting.
Jprop’s components are made from a variety of stainless steel and aluminum-bronze alloys. Each alloy is
Materials
designed to suit the specific properties of the application. For instance, the pitch gear, blades, housing and tail-cone are all made from different alloys resulting in less wear between the parts. The combination of stainless steel and aluminum-bronze components also enhance lubrication and minimize corrosion.
The non-directional blade shape of Jprop not only reduces drag when feathered under sail. It also enables, when properly pitched:
A reverse thrust equal to forward thrust.
Elliptical Blade
Blade widths to be approximately 35% of the prop diameter (usually 25% on fixed sailor props). A maximum thrust comparable to standard power-boat propellers of the same dimensions (such as Federal’s Pleasure Propellers).
Jprop Capacity Limits
63mm hubs - up to 60 Hp
83mm hubs - 55 to 100 Hp 93mm hubs - 90 to 140 Hp
116mm hubs - 120 to 240 Hp
J PROP MARINE PROPELLERS TYPE A – HUB 63
TYPE B – HUB 83
Two Blade
Three Blade
Three Blade
Dia.
£
Dia.
£
Dia.
£
13” 14” 15” 16” 17” 18”
1295.00 1325.50 1355.00 1386.00 1417.00 1447.00
13” 14” 15” 16” 17” 18”
1516.00 1560.00 1607.00 1652.00 1699.00 1744.00
17” 18” 19” 20” 21” 22”
2178.00 2315.00 2361.00 2407.00 2467.00 2513.00
For the last 30 years, feathering propellers have been the most efficient, all-round, drag reducing propeller for sailboats. The best known make of feathering propeller is the MaxProp which has dominated the
TYPE C – HUB 93
TYPE D – HUB 116
TYPE E – HUB 145
market since being introduced in the 70’s and was at this time considered to be state of the
Three Blade
Three Blade
Three Blade
art design. MaxProp is still sold today in its original form with some minor modifications,
Dia.
£
Dia.
£
Dia.
£
20” 21” 22” 23” 24” 25”
2900.00 2970.00 3016.00 3061.00 3107.00 3153.00
24” 25” 26” 27” 28” 29” 30”
4745.00 4859.00 4859.00 4974.00 5088.00 5202.00 5316.00
31” 32” 33” 34” 35” 36” 37” 38”
8546.00 8699.00 8851.00 9004.00 9255.00 9445.00 9850.00 10252.00
such as external lubrication. It was in the late 80’s in Solbiate Olona Italy, that two companies; Cober srl (ltd) specialists in CNC technology and Marine Propeller set out to address what improvements could be made to this older design of feathering propeller that had, what were to them, inherent deficiencies.
SAILDRIVE A – 63 HUB
SAILDRIVE A – HUB 64
SAILDRIVE B – HUB 83
Two Blade
Three Blade
Three Blade
Dia.
£
Dia.
13” 14” 15” 16” 17” 18”
1423.00 1455.00 1485.00 1515.00 1546.00 1576.00
13” 14” 15” 16” 17” 18”
1645.00 1690.00 1737.00 1782.00 1828.00 1874.00
ANODE WITH BOLTS Propeller Type
£
£
Dia.
£
15” 16” 17” 18” 19” 20” 21” 22”
1848.30 1917.00 1995.00 2143.00 2261.00 2379.00 2458.00 2556.00
ANODE
KEY KIT
£
Their objective was to produce a factory “permanently assembled” feathering propeller using CNC machining technology. In order to achieve this, the Jprop was designed to meet the following criteria:
Installation rather than assembly of prop on the shaft. Pitch is externally adjustable and provides a clear base-line from which to adjust the prop to the specific boat. All components are CNC machined to tolerance, allowing free movement and no need for the to adjust components.
£
TYPE A/B 17.00 35.00 45.00 29.00 51.00 TYPE C 22.00 49.00 56.05 TYPE D/E 25.00 Prices do not include VAT – Delivery: £30 ex works Italy
Deacons Boatyard, Bursledon Bridge Southampton, SO31 8AW
Tel 02380 403 944 Fax 02380 404 509
email [email protected] website www.calibramarine.com
Provide external lubrication. Designed to reduce wear.
In 1993 a US patent was ed on which today’s J Prop is based. (see US patent 5232345 @ www.uspto.gov)
Design Features
Jprop uses only helical (or continuously engaged) gears. Resulting in two distinct advantages:
Helical Gears
Differentially Geared Pitch Adjustment
The blades of the propeller will have identical pitch at all times. Helical gears have a large area producing more strength and less wear.
The pitch setting is determined by the amount of rotation the planetary gears are allowed by the internal stop in the adjustable tail-cone. As the shaft (C) and the drive gear (B) rotate clockwise, the planetary
gears (G) rotate the blades (F). The pitch gear (E) rotates counter-clockwise in this differential system. The housing remains stationary until the blades and pitch gear have rotated to the internal stop and therefore the pitch setting.
Jprop’s components are made from a variety of stainless steel and aluminum-bronze alloys. Each alloy is
Materials
designed to suit the specific properties of the application. For instance, the pitch gear, blades, housing and tail-cone are all made from different alloys resulting in less wear between the parts. The combination of stainless steel and aluminum-bronze components also enhance lubrication and minimize corrosion.
The non-directional blade shape of Jprop not only reduces drag when feathered under sail. It also enables, when properly pitched:
A reverse thrust equal to forward thrust.
Elliptical Blade
Blade widths to be approximately 35% of the prop diameter (usually 25% on fixed sailor props). A maximum thrust comparable to standard power-boat propellers of the same dimensions (such as Federal’s Pleasure Propellers).
Jprop Capacity Limits
63mm hubs - up to 60 Hp
83mm hubs - 55 to 100 Hp 93mm hubs - 90 to 140 Hp
116mm hubs - 120 to 240 Hp
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