Flexible 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 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


American Sourced Marine Parts:  


The product on this page ships worldwide from the United States by Fedex, UPS, Aramex or DHL. 
These are premium services with tracking.  Delivery to most destinations is between 6-9 business days. 
The minimum freight charge is AUD$85 (about US$57) See table below.


All prices shown are in Australian AUD$.

We sell this part by the manufacturer's part number.  These products are special order from the USA, meaning 
there are no returns, no exchanges and no refunds possible.  The sale is final.


Prices include Australian 10% GST, but may be subject to further customs fees or charges if the order is over AUD$1000. 
Shipments outside of Australia are tax free.


Any additional import fees are paid by the customer.  We will assist with customs formalities if necessary.


Manufacturer's warranty applies.  The warranty is in the box.  If a product is dead on arrival, we will replace it.   
Where possible warranty DIY spare parts will be provided.  
MarineDirect Australia will contribute $50 towards your return freight charges to the USA 
within one year of order if there is a warranty issue.


Dangerous Goods: 


Liquids, gels, pastes and replacement lithium batteries may not ship under any circumstances.


Grey Marketing & Compliance:  


Where a brand has an established distributor in 
Australia, we will decline to sell it.  
Most such brands and products have been removed 
from our American listings.     
Some items shown within this category are intended only 
for the American marketplace and 
may not be compliant with Australian Standards 
and in which case we cannot sell them to you and/or will refund you.




Express Freight Charges:  Total freight cost is based on the weigh of the package. 


The default freight charge is $85 for the first kilo.


The shipping weight kg of the item is shown 
under the Specifications tab above.


We use Fedex, UPS, DHL and Aramex Fedex which is generally a 6-9 business day service. Tracking is provided. 


Following your purchase we will calculate the freight charges based on the table below.   The default shipping rate for 1kg for any order is $85. 


If the weight is greater than 1 kilo, then the following additional amounts will be payable in arrears AUD$ and prior to shipping:


 


0-1kg $85 (This is the default rate)


>1-2kg  +$40


>2-3kg  +$65


>3-4kg  +$80


10kg    +$185


15kg    +$240


20kg    +$295


Some bulky items may be classified as oversize regardless of their weight.  Freight charges over 1 kilo will be based on the table above.


 

(54875)

SKU 54875
Shipping Weight 2.0500kg