By Dave Gerr
The First Ever advisor for Optimizing Boat Systems
This consultant is worthwhile for someone designing or fitting mechanical platforms on a brand new boat, retrofitting an current boat, or comparing a boat's working . Writing for designers, developers, vendors, purchasers, mechanics, surveyors, and insurers of sailboats, powerboats, and advertisement vessels, Dave Gerr offers layout and set up information for every significant mechanical approach plus pragmatic directions and real-world interpretations of yank Boat & Yacht Council (ABYC) and eu criteria. No marine specialist or severe boater may be with no Boat Mechanical structures Handbook.
"Dave Gerr has a knack for breaking down the extra esoteric recommendations of naval structure into language that’s simply understood via the layman, that's one of many the explanation why his writing frequently appears to be like within the pages of SAIL. one more reason is his deep functional wisdom of the intricacies and subtleties of boat development and structures, and how they relate to one another. The subhead of Boat Mechanical platforms Handbook says it all--'how to layout, set up and realize right structures in boats.' gentle examining this isn’t, but when you’re approximately to refit your boat or improve outmoded structures, maybe with a few critical voyaging in brain, this e-book is a valuable funding. it is a unisex ebook, for either powerboaters and sailors; there’s no point out of cruising rigs, yet any other plausible procedure is roofed roughly exhaustively."
--PETER NIELSEN, SAIL, November 2009
Praise for Dave Gerr's prior books:
The parts of Boat Strength:
“Certain books, due to their thoroughness, are inclined to develop into criteria; such is the case with The parts of Boat Strength.”
“The top layman's consultant now we have ever read.” --Practical Sailor
“Gerr made a sophisticated subject comprehensible and placed it right into a guide that's effortless to use.”
The Nature of Boats:
“Offers, in a disarmingly captivating type, a glance in any respect features of what makes a ship paintings. when you are now not nautically obsessed sooner than examining this publication, you probably can be afterward.”
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Extra info for Boat mechanical systems handbook: how to design, install, and recognize proper systems in boats
The shaft runs from the engine coupling, through the rigid stuffing box, and then to the stern bearing in the propeller strut. There are situations, though, when an external intermediate strut bearing (occasionally two of them) is unavoidable. This is not a problem; it simply represents a bit more appendage drag. SHAFT COUPLINGS AND KEYWAYS Propeller-shaft couplings are available in several styles or types: there are tapered-bore, split straight-bore, straight-bore, and more (Figure 1-14). The straight-bore couplings are easier to machine, having no taper, but they are not my first choice for propeller shafts.
This sounds rather high-tech, but it’s simple in principle. Say the unwanted noise is occurring at 2,200 revolutions per minute (rpm), and the boat has a 2:1 gear and 3-bladed props. The frequency for shaft noise would simply be 2,200 rpm ÷ 2, or 1,100 shaft rpm, which would be 1,100 cycles per minute (cpm). 33 cycles per second (cps), or hertz (Hz). Propeller tip noise would be 1,100 rpm shaft speed × 3 blades = 3,300 cpm, or 55 cps or Hz. You can see that there’s a big difference in frequency, so usually it’s fairly easy to distinguish between shaft or bearing and tip noise.
Length at propeller-shaft boss = 4 × 11/2 in. shaft diameter = 6 in. Formula 2-3c. 5 × 32 mm = 208 mm Length at propeller-shaft boss = 4 × 38 mm shaft diameter = 152 mm TABLE 2-1. YIELD STRENGTHS OF COMMON STRUT MATERIALS Alloy Yield, psi Yield, kPa Commercial bronze 37,000 Manganese bronze, SAE No. 43 65,000 Manganese bronze, SAE No. 430 (GrA) 90,000 Manganese bronze, SAE No. 430 (GrB) 110,000 Silicon bronze 55,000 Phosphor bronze 55,000 Aluminum bronze 55,000 Stainless steel 304 35,000 Stainless steel 316 42,000 Stainless steel 316L 42,000 Aluminum 5000 series 34,000 Aluminum 5000 series as welded 14,000 255,000 448,000 620,500 758,400 379,000 379,000 379,000 241,000 289,500 289,500 234,400 96,500 Discussion of Strut Alloys The longest-lasting alloys by far are silicon bronze or one of the phosphor or aluminum bronzes.