12G ⅜ 11 Propeller
Product description
The 11 ⅜ × 12-G propeller is a combination of rapid acceleration, economical cruising speed, and long-lasting durability in the corrosive marine environment. If you’re looking to noticeably enhance the performance of your 50 HP boat at a reasonable cost, this model is a reliable choice.
Product Summary
The 11 ⅜ × 12-G propeller is designed for the Yamaha 50 HP engine and performs best on recreational and fishing boats.
With a diameter of 11 ⅜ inches and a 12G pitch, it creates an ideal balance between initial acceleration and cruising speed.
The aluminum material combined with a double-layer coating makes it highly resistant to saltwater corrosion.
The recommended operating speed is 2200 rpm, but it can operate up to 5500 rpm without cavitation.
The optimal boat speed with this propeller is about 20 to 30 mph; within this range, the engine fuel consumption is minimized.
Technical specifications
| Feature | Value / Description |
|---|---|
| Model | 11 ⅜ × 12-G |
| Compatible Engine | Yamaha 50 HP (4-stroke / max RPM 5500) |
| Propeller Diameter | 12G ⅜ / 11 |
| Pitch | 12 G (balanced for acceleration and speed) |
| Recommended Operating RPM | 2,200 RPM (stable) |
| Optimal Speed on Water | 20 – 30 mph |
| Material | High-pressure cast aluminum with double anti-corrosion coating |
| Application | Recreational boats, light fishing, and service boats ≤ 1 ton load |
| Warranty | 12 months |
All figures are extracted from factory tests on a 5.4-meter fiberglass boat with 3 crew members and 50 kg of side load.
Key technical specifications
Torque
High at low RPM
Power
4500-5000 RPM
Material
Aluminium
Flexibility
205 MPa
Endurance
4800 RPM / 150 h
Motor Horsepower
50 HP
Torque
● Three-blade design with thick root: The large cross-sectional area at the root generates high torque at low RPMs, delivering faster hole shots and noticeable acceleration when planing.
● CAMBER + 10° RAKE geometry: The smooth leading edge guides water in a spiral flow. A 50 HP engine can generate ≈ 83 Nm of usable torque in mid-RPM ranges—ideal for quick hole shots and steady tow performance. Compared to flat-blade designs, energy loss is reduced by up to 7%.
● Real-world result: Your boat reaches cruise speed with full load (up to 5 passengers) without cavitation, and won’t lose speed suddenly during maneuvers.
● CAMBER + 10° RAKE geometry: The smooth leading edge guides water in a spiral flow. A 50 HP engine can generate ≈ 83 Nm of usable torque in mid-RPM ranges—ideal for quick hole shots and steady tow performance. Compared to flat-blade designs, energy loss is reduced by up to 7%.
● Real-world result: Your boat reaches cruise speed with full load (up to 5 passengers) without cavitation, and won’t lose speed suddenly during maneuvers.
Horsepower Utilisation
● Precisely matched to the Yamaha 50 HP power curve: The 12G pitch keeps the engine within its peak power band (5000–4500 RPM), reducing fuel consumption by up to 9%.
● Performance in light waves: The prop does not cavitate at high RPMs, so the engine reaches full throttle smoothly, with consistent thrust.
● Fuel efficiency: In a 30-minute test, consumption was 7.8 L/h at 26 mph.
● Performance in light waves: The prop does not cavitate at high RPMs, so the engine reaches full throttle smoothly, with consistent thrust.
● Fuel efficiency: In a 30-minute test, consumption was 7.8 L/h at 26 mph.
Flexibility
● The composite alloy has a yield strength of 205 MPa and 4% elasticity—blades bend slightly under minor impacts (floating wood, soft sand) instead of breaking.
● Hot-Spun Hub with rubber shock bushing absorbs 65% of torsional shock before it reaches the shaft, resulting in a healthier gearbox and smoother ride.
● Repairable: If bent, the prop can be heat-straightened (Prop-Tune) up to three times.
● Hot-Spun Hub with rubber shock bushing absorbs 65% of torsional shock before it reaches the shaft, resulting in a healthier gearbox and smoother ride.
● Repairable: If bent, the prop can be heat-straightened (Prop-Tune) up to three times.
Durability
● Single-phase epoxy finish offers 800 hours of salt-spray resistance (ASTM B117).
● Endurance test: 150 hours of continuous operation at 4800 RPM showed no pitch loss or surface cracks.
● Endurance test: 150 hours of continuous operation at 4800 RPM showed no pitch loss or surface cracks.
Colors & Finish
Recommended Color:
Silver Matte
Coating:
Epoxy powder coating; low light reflection
Benefit:
Matches most fiberglass hulls; minimizes visible scratches
Recommended Color:
Graphite Black
Coating:
Semi-matte with microcrystal particles
Benefit:
Perfect camouflage on dark transom; absorbs light and reduces glare
Recommended Color:
Marine Pearl White
Coating:
Dual-layer pearlescent gloss
Benefit:
Matches white hulls; easy to clean salt stains
Recommended Color:
Navy Blue
Coating:
Glossy polyurethane coating
Benefit:
Professional look for patrol boats; better visibility underwater
Recommended Color:
Silver Matte
Coating:
Epoxy powder coating; low light reflection
Benefit:
Matches most fiberglass hulls; minimizes visible scratches
Recommended Color:
Graphite Black
Coating:
Semi-matte with microcrystal particles
Benefit:
Perfect camouflage on dark transom; absorbs light and reduces glare
Recommended Color:
Marine Pearl White
Coating:
Dual-layer pearlescent gloss
Benefit:
Matches white hulls; easy to clean salt stains
Recommended Color:
Navy Blue
Coating:
Glossy polyurethane coating
Benefit:
Professional look for patrol boats; better visibility underwater
Recommended Color:
Sport Red
Coating:
Glossy epoxy with UV-resistant pigment
Benefit:
Increased safety visibility; ideal for ski and racing boats
Recommended Color:
Aquamarine Green
Coating:
Semi-transparent metallic coating
Benefit:
Blends with shallow waters; unique look for eco-tour boats
Recommended Color:
Titanium Grey
Coating:
Hard anodized + clear lacquer
Benefit:
Maximum abrasion resistance; premium industrial appearance
Recommended Color:
Solar Gold
Coating:
Dual-layer metallic powder coating
Benefit:
Eye-catching in exhibitions; reflects warm light
Recommended Color:
Signal Orange
Coating:
Matte UV-resistant polyurethane
Benefit:
Best emergency visibility; recommended for rescue teams
Recommended Color:
Thunder Purple
Coating:
Metallic gloss with dual-tone spectrum
Benefit:
Unique sunlit appearance; ideal for custom branding
| Recommended Color & Code | Type of Coating & Visual Finish | Suggested Advantage / Application |
|---|---|---|
| Silver Matte | Epoxy powder coating; low light reflection | Matches most fiberglass hulls; hides scratches well |
| Graphite Black | Semi-matte with microcrystal particles | Camouflages on dark transoms; reduces glare |
| Marine Pearl White | Dual-layer pearlescent gloss | Pairs with white hulls; easy salt stain cleanup |
| Navy Blue | Glossy polyurethane coating | Professional look for patrol boats; good underwater visibility |
| Sport Red | Glossy epoxy with UV-resistant pigment | Enhanced safety visibility; ideal for ski & racing boats |
| Aquamarine Green | Semi-transparent metallic overlay | Blends with shallow waters; unique for ecotourism boats |
| Titanium Grey | Hard anodized + clear lacquer | Maximum abrasion resistance; industrial luxury look |
| Solar Gold | Dual-layer metallic powder coating | Eye-catching for exhibitions; reflects warm light |
| Signal Orange | Matte polyurethane, UV-resistant | Best emergency visibility; recommended for rescue teams |
| Thunder Purple | Glossy metallic with dual-tone shimmer | Unique sunlight effect; ideal for custom branding |
For orders of more than 10 units, laser engraving of your logo is also available.
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