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Beta Marine US Equipment

J-Prop Saildrive Feathering Propeller

J-Prop SBD feathering propeller for saildrives, tested and approved by Yanmar, for engines from 8 to 110 HP; rubber shock dampers, fail-safe spline/conical mounting and adjustable pitch.

Description

The J-Prop Saildrive Feathering Propeller (SBD) is a feathering propeller for saildrive installations, tested and approved by Yanmar for its saildrive engines and available for engines from 8 to 110 HP. It arrives fully assembled, fits on the shaft like a conventional propeller, and the pitch is then set to suit the installation. J-Prop was developed in the late 1980s and patented in the US in 1991 (Patent #5232345).

Key features

  • No drilling required for installation
  • Replaceable shock-absorbing rubber rings absorb shock to the saildrive when engaging gear
  • Fail-safe: remains engaged with no loss of power if damaged; secured by splines and conical clamps
  • Helical (continuously engaged) gears keep all blades at identical pitch with low wear
  • Stainless steel and aluminium-bronze alloy components chosen per part to reduce wear and corrosion
  • Elliptical blades give equal thrust ahead and astern and low drag when feathered

Pitch adjustment

Pitch is set by a differentially geared mechanism: the internal stop in the adjustable tail-cone limits planetary gear rotation. With the blades feathered, the ogival nose is pulled out, turned toward the R or L side (per engine rotation) to the notch for the desired pitch, and released so it seats firmly against the propeller body.

Hub sizes and power ratings (J-Prop range)

  • 63 mm: up to 60 HP
  • 83 mm: 55–100 HP
  • 93 mm: 55–100 HP
  • 116 mm: 120–240 HP
  • 145 mm: 145–400 HP

Specifications

Hub SizePower
63 mmup to 60 HP
83 mm55 to 100 HP
93 mm55 to 100 HP
116 mm120 to 240 HP
145 mm145 to 400 HP
Design FeaturesDesign Features Helical Gears J-Prop uses only helical (or continuously engaged) gears, resulting in two distinct advantages: The blades of the propeller will have identical pitch at all times. Helical gears have a large contact area producing more strength and less wear. Materials J-Props component
DimensionsDimensions HubCONOdMNCSPhLIL + I 63 250775949142513622410234 3018775949142515424210252 SD27775949142516325110261 833001006057162516025812270 35101006057162517026812280 SD151006057162517527312285 933501167073183018630713320 40111167073183019731813331 45211167073183020732813341 11645-10146778320352133
Power RatingsRatings Hub SizePower 63 mmup to 60 HP 83 mm55 to 100 HP 93 mm55 to 100 HP 116 mm120 to 240 HP 145 mm145 to 400 HP
Pitch AdjustmentPitch Adjustment Differentially Geared Pitch Adjustment 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 and the drive gear rotate clockwise, the planetary gears rotate the blades. The pitch gear
Support Literature & ManualsSupport Literature & Manuals J-Prop Propellers J-Prop Propellers for Saildrives J-Prop Propellers for Saildrives (with Rubber Dampers)
Dealer NetworkDealer Network We always recommend that you talk to your local Beta Marine dealer about what you are looking for, so that you can agree a specification of the engine and accessories you require and they will then quote you. A list of authorised Beta Marine US dealers maybe found within the interacti
J-Prop Enquiry FormJ-Prop Enquiry Form #gform_wrapper_5[data-form-index="0"].gform-theme{--gf-color-primary: #204ce5;--gf-color-primary-rgb: 32, 76, 229;--gf-color-primary-contrast: #fff;--gf-color-primary-contrast-rgb: 255, 255, 255;--gf-color-primary-darker: #001AB3;--gf-color-primary-lighter: #527EFF;--gf-color-sec
Hub CONO d M N C S P h L I L + I
63 25 0 77 59 49 14 25 136 224 10 234
30 18 77 59 49 14 25 154 242 10 252
SD 27 77 59 49 14 25 163 251 10 261
83 30 0 100 60 57 16 25 160 258 12 270
35 10 100 60 57 16 25 170 268 12 280
SD 15 100 60 57 16 25 175 273 12 285
93 35 0 116 70 73 18 30 186 307 13 320
40 11 116 70 73 18 30 197 318 13 331
45 21 116 70 73 18 30 207 328 13 341
116 45 -10 146 77 83 20 35 213 351 15 366
50 0 146 77 83 20 35 223 361 15 376
55 10 146 77 83 20 35 233 371 15 386
145 55 -10 185 105 116 25 35 280 456 18 474
60 0 185 105 116 25 35 290 466 18 484
65 10 185 105 116 25 35 300 476 18 494

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