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Ships within 48 hours · Estimated delivery Aug 18 - Aug 23
For Your Every Summer RSVP, with Code: SUMMER15
Description
R & D Flexible Shaft Coupling f/5" B/W, Hurth - 8HP/100RPM CapacityFlexible Shaft Coupling for 5" B W, Hurth 8HP 100RPM Capacity The R&D Flexible Couplings are fabricated from a contoured flexible disc molded in tough yet resilient new type polyurethane. The contoured disc gives clearance for the bolt heads, and is able to flex freely to take up any temporary misalignment of the engine and shaft, due to flexing of the boat structure or the engine moving on its rubber vibration isolation mountings. Forward thrust is
Flexible Shaft Coupling for 5" B/W, Hurth - 8HP/100RPM CapacityThe R&D Flexible Couplings are fabricated from a contoured flexible disc molded in tough yet resilient new type polyurethane. The contoured disc gives clearance for the bolt heads, and is able to flex freely to take up any temporary misalignment of the engine and shaft, due to flexing of the boat structure or the engine moving on its rubber vibration isolation mountings. Forward thrust is taken in compression on the disc between the two half couplings and reverse thrust is taken again in compression on the disc between the two fail straps. In the unlikely event of a disc failure the steel straps make the coupling fail safe and ensure drive is maintained in both forward and reverse.
To calculate power of coupling required:
Horse Power of Engine x Reduction Ratio x 100 = HP/100RPM
Engine Speed
Example:
Ford 150 HP at 2500 RPM with Borg Warner Velvet Drive 72C 2:1 Reduction Ratio
Engine Horse Power is 150 HP, Max Rated RPM is 2500, Reduction Ratio is 2:1
150/2500 X 2 x 100 = 12hp per 100RPM
Coupling required is 910-009
The R & D Marine Flexible Coupling fits between the transmission output flange and shaft coupling. It is designed to protect a boat's drivetrain. The unit will reduce vibration, compensate for some misalignment, isolate the shaft and absorb shock loads.
The flexible disc is machined from a resilient and durable polyurethane. It allows the unit to flex, absorbing vibrations and temporary misalignment of the shaft and engine due to movement of the engine or flexing in the =vessel's structure.
The polyurethane disc is backed up by two metal compression straps, one on either side of the flexible coupling. These metal straps hold the system in constant compression whether the drivetrain is in forward or reverse. This feature extends the life of the system dramatically.
The R & D Marine Flexible Coupling will also absorb shockloads resulting from gear changes, or the propeller striking a submerged object. The polyurethane disk will distort with light shock loads and is designed to be sacrificial in the event of severe shock load, saving on expensive drivetrain repairs. If the disc is destroyed from massive shockload the metal compression straps keep the coupling intact ensuring that the drive system is functional in both forward and reverse.
Why R&D Marine Flexible Shaft Couplings?
- Polyurethane flange creates a flexible barrier to reduce drivetrain noise and vibration to quiet your drivetrain
- Absorbs transmission shock load caused by the propeller and high speed gear changes. This helps to reduce and avoid costly transmission damage
- Fail safe design, both forward and reverse thrust is taken in compression from the steel straps, giving a durable design even in extreme conditions
Manufacturer : R & D Marine
Manufacturer Part No : 910-044
UPC : 839662004114
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 5
Favorite charger
Size: 10FT, Color: Yellow
This is my 3rd purchase of this brand of charger (different colors). The yellow color is just as pictured. These chargers always fit flawlessly with my iphone15 pro. The charger provides a fast and lasting charge for my phone, iPad, or anything else I connect it to. I love the bright color options. I highly recommend this charger because they are durable and provide a quick, long lasting charge.
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Perfect charger
Size: 10FT, Color: White
Very impressed with how quickly the charger works. The longer cable has made it easier to use the phone while charging and sitting on the couch. No issues with the cable getting tangled or fraying like I have had with others, or pinching and breaking the connection.
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Mighty Mac!
Capacity: 16GB Unified Memory | 512GB SSD Storage, Color: Sky Blue, Set: Without AppleCare+, Capacity: 16GB Unified Memory | 512GB SSD Storage, Color: Sky Blue, Set: Without AppleCare+
Love my new Mac! Works great, speed is good! Color is fantastic!!! Setup was easy, good value and the screen quality is great!
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Good as expected
Capacity: 16GB Unified Memory | 512GB SSD Storage, Color: Silver, Set: Without AppleCare+
Came I recently got the Apple 2026 MacBook Air 15-inch with the M5 chip, and honestly it exceeded my expectations. The performance is super fast—everything from everyday tasks to heavier work like editing and multitasking runs smooth without any lag. The battery life is impressive too, easily lasting me all day without needing to charge.
What I really like is how thin and lightweight it feels for a 15-inch laptop, making it easy to carry around while still having a big, beautiful display. The screen quality, sound, and overall build just feel premium, like you’d expect from Apple. Plus, it stays completely silent since there’s no fan, which is a big plus.
Overall, if you’re looking for a powerful, reliable laptop that’s great for both work and everyday use, this one is definitely worth it.
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Reviewed in the United States on March 30, 2026
★★★★★ 5
Apple MacBook Air 15-inch (2026): Big Screen, Fast Performance, and Perfect Apple Ecosystem Upgrade
Capacity: 16GB Unified Memory | 512GB SSD Storage, Color: Starlight, Set: Without AppleCare+, Capacity: 16GB Unified Memory | 512GB SSD Storage, Color: Starlight, Set: Without AppleCare+
I just received my 2026 Apple MacBook Air 15-inch, and overall, I’m really impressed. At first, there was a bit of anxiety because the app showed my overnight delivery as being delayed by about a week, but it actually arrived exactly on time, which was a great relief.
The packaging was solid and everything arrived in perfect condition. Setup was quick and easy as expected with Apple products, and I’m officially now fully in the Apple ecosystem—iPhone, iPad, Apple Watch, AirPods, and now MacBook.
The 15-inch screen is definitely a standout. It’s noticeably larger in person compared to the 13-inch, and that extra space makes a big difference for my marketing work, content creation, and anything detail-heavy. It also just feels better for everyday use and personal browsing.
Performance-wise, it’s fast, smooth, and everything runs seamlessly. It integrates perfectly with my other Apple devices, which makes my workflow feel really effortless.
Overall, I’m very happy with it so far and excited to fully customize it and make it my daily driver.
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Reviewed in the United States on May 16, 2026
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