Thomas Marine Hardware, we use Western Branch Metal Aqualoy 22 and Aqualoy 22 HS (high strength) exclusively. This 0.2% yield strength is a common measurement when discussing material strength and it has been adopted by the marine industry.Īt R.E. For the purposes of this calculator, torsional yield strength refers to the amount of force in pounds per square inch (PSI) that it takes to “twist” the shaft by 0.2%. While most of the data required for the propeller shaft size calculator are readily available, the one variable least understood is torsional yield strength. For “heavy commercial and racing boats”, Dave Gerr (author of Propeller Handbook) recommends a safety factor between 5 and 8.įor more information regarding propeller shaft safety factors or to order a propeller shaft give us a call at (207) 422-6532 or send us an email through our contact page. Commercial vessels, offshore fishing boats, racing boats, and vessels operating in extreme environments should have an appropriate safety factor based on the projected wear and tear on the boat’s running gear.Īs is the case, the American Boat & Yacht Council recommends a safety factor “ approaching five” for inboard diesel powered pleasure boats. However, boat’s are not designed for perfect conditions and rarely are they intended for limited use. In perfect conditions with limited use, a safety factor of 1 can feasibly transfer power from the engine, through the reduction gear, to the propeller. The higher the safety factor, the more protected your boat is from a catastrophic propeller shaft failure. Think of a propeller shaft safety factor as a protection against risk. So what is a propeller shaft safety factor?
Simply put, our heavy duty self-aligning shaft seal is the safest and most dependable shaft sealing device on the market and is ideal for high horsepower commercial and recreational installations.This calculator computes an objective safety factor (design coefficient) based on user provided data.
#Inboard propeller sa plus#
Less Vibration and Noise PLUS A Drier Bilge Our self-aligning shaft seal combines the benefits of a “dripless” mechanical seal with the bullet proof reliability and performance of a traditional bronze stuffing box. There’s also a hose barb connection to your boat’s raw water pump to keep the unit cool and the cutless bearing lubricated. The bearing housing mounts in place of your boat’s stuffing box flange and the packing nut assembly (shaft seal) self-aligns on the shaft by way of a heavy duty flexible hose. Thomas Marine Hardware’s self-aligning shaft seal with intermediate bearing housing featuring Johnson Cutless Bearings.
#Inboard propeller sa upgrade#
Upgrade your boat’s traditional stuffing box with R.E. Proven performance for today’s higher horsepower commercial and recreation boats with less noise and vibration. Our self-aligning shaft seal is attached to an intermediate shaft bearing (in place of existing stuffing box) offering improved safety and reliability over other “dripless” and “packless” style mechanical shaft seals. The perfect upgrade for boats with traditional bronze stuffing boxes. SELF-ALIGNING SHAFT SEAL | ISB-SA COMBO W/BEARING
0 kommentar(er)
