12G ⅜ 11 Propeller

Product Discription

Propeller 11 ⅜ × 12-G offers a combination of fast acceleration, economical cruising speed, and long-term durability in marine environments. If you’re looking to enhance the performance of your 50 hp boat at a reasonable cost, this model is a dependable option.

Product Summary:

1. The 11 ⅜ × 12-G propeller is designed for Yamaha 50 hp engines and delivers excellent performance on recreational and fishing boats.

2. With a diameter of 11 ⅜ inches and a 12-G pitch, it strikes an ideal balance between quick initial acceleration and efficient cruising speed.

3. Made from aluminum with a dual-layer coating, it provides strong protection against corrosion in saltwater conditions.

4. Recommended operating speed is 2200 RPM, and it performs efficiently without cavitation up to 5500 RPM.

5. The optimal boat speed ranges between 20 to 30 mph; within this range, fuel consumption remains low.

Technical Discription

Feature	Value / Description
Model	11 ⅜ × 12-G
Compatible Engine	Yamaha 50 HP (4-stroke / Max RPM 5500)
Propeller Diameter	11 ⅜ inches
Pitch	12-G (Balanced for acceleration and speed)
Recommended RPM	2,200 RPM (Stable)
Ideal Water Speed	20 – 30 mph
Material	High-pressure cast aluminum with dual anti-corrosion coating
Usage	Recreational boats, light fishing boats, and service vessels (≤ 1 ton load)
Warranty	12 months

All figures are based on factory tests conducted using a 5.4-meter fiberglass boat with 3 crew members and a 50 kg side load.

Key Technical Discription

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.

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.

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.

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.

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