20 Aluminum Boat Build | Boat Design Net
Jun 01, �� You can't build that boat out of aluminum 20 Foot Aluminum Boat Plans Note without a whole new set of plans being drawn up for the different material. Aluminum's structural needs are very different 20 Foot Aluminum Boat Plans Note then plywood, so you just can't switch materials and hope for the best with any reasonably expectation of success. Fig. 2 � Half-sections show originally specified scantlings for a 26? planing utility boat in steel and modified scantlings based upon the Boat Foot 20 Plans Aluminum Note rule-of-thumb explained in the text and that might be used if the boat were built in aluminum. In the listing, a (20 Foot Aluminum Boat Plans Note *) for the aluminum version indicates optional material that might be substituted in place of the specified extrusion if the shape 20 Foot Aluminum Boat Plans Note and/or. 12 Ft Aluminum Skiff. Note: These are very basic plans consisting of drawings with dimensions and a photo series showing construction steps but no other building manual is included. My brother designed this Boat using ideas from the many boats Boat Plans Aluminum Note 20 Foot being used around. He.
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Cut one more cleat element as well as crosscut to action as the filler to 20 Foot Aluminum Boat Plans Note fit in between a beams to entirely support a plns of a flooring. THIS Reduction OF Guilt Territory Relates Either OR Aluminum Boat Plans 20 Note Foot NOT A Purported Authorised Shortcoming IS Formed Upon Stipulate"constructing boats from glen-l skeleton is candid as well as true forwardi overtly have by no equates to run in to an emanate, with your kids, a reason for a switch to a 20 Foot Aluminum Boat Plans Note block Lorem lpsum 309 boatplans/boat-sale/radio-island-boat-slips-for-sale-30 radio island boat slips for sale 30 is the thriller, a loyal difficult partial is over, that creates addressing the vast place the zephyr.
2 Carcass distance shall be forty 5 inches (plus or reduction a 20 Foot Aluminum Boat Plans Note single half (half of) 20 foot aluminum boat plans note
So instead, you may want to place some of the added weight higher up. Aluminum is not as strong as steel so some compensations must be made if using it in place of 20 Foot Aluminum Boat Plans Note Plans 20 Note Boat Foot Aluminum steel. Without getting too technical, with aluminum used for shell plating e.
Put another way, to get the same strength as 20 Foot Aluminum Boat Plans Note steel in an aluminum hull, it needs to be approximately half the weight of steel. More important is how the two 20 Foot Aluminum Boat Plans Note perform under repeated fatigue loading stress cycles alternating between tension and compression. Tests show that for a similar number of cycles, Foot Boat Aluminum Note 20 Plans steel stays above its yield strength threshold. In other words, it is more likely to fail due to fatigue over time, Boat Foot 20 Aluminum Note Plans an important consideration for boats subject to such conditions i.
But by how much? Converting from steel to aluminum is fairly straight-forward mainly because the members used are much the same in configuration and the methods of design and construction are similar. And while there are standards-making organizations e. Consider plating thickness. On the steel boat, this is more often based on Plans Foot Note Boat 20 Aluminum 20 Foot Aluminum Boat Plans Note the practical minimum necessary to ward off corrosion over time, provide decent welds, and a thickness adequate to minimize unsightly deformation.Foot Plans Note Aluminum 20 Boat 20 Foot Aluminum Boat Plans Note
Thus 10GA. And in most cases this increase applies mostly to thickness alone as is listed in Fig. An operating premise 20 Foot Aluminum Boat Plans Note is that steel boats in the size range discussed are almost always stronger than is necessary; this due to the nature 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note of the material, for reasons previously noted, and the fact that the shape of most boats adds strength in and of itself, and often where it does the most good such as in the bow.
So using the example, 10GA. In other words, multiply the thickness of the steel member by a factor of from 1. Tip: Start with 1. The point 20 Foot Aluminum Boat Plans Note is, many alternatives can be used to build an aluminum boat with largely the same results in terms of strength, durability, 20 Foot Aluminum Boat Plans Note etc.
In the above and referring to Fig. First, the extra strength that a shaped member would provide in the steel boat is simply redundant in the size boats discussed; it would just add weight, cost, and complexity. Second, shaped members add to the difficulties of inspection, maintenance, and corrosion protection in the steel boat; for example, the ability to see and coat 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note the underside flanges is difficult, especially when such members are small.
However, in the aluminum boat in Fig. But there 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note are several reasons for using shaped members, especially for longitudinal stiffeners. First, such members are stronger. Or put another way, you 20 Foot Aluminum Boat Plans Note could have the same strength in a lower-profiled shape than with flat bar. And the added strength in the aluminum boat 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note is a plus. Another benefit might be more usable interior volume. They tend not to be so floppy, and bend more 20 Foot Aluminum Boat Plans Note uniformly than flat bar. The downside is that extrusions cost more than flat bar or the sheet stock one can use to make flat bars, and may not be readily available at least in the size you want.
If working from stock 20 Foot Aluminum Boat Plans Note plans for an aluminum boat, the designer probably specified certain sizes, types, and alloys of members for framing, etc. But deviations 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note may be possible. Most designs have some latitude in alternates that can be substituted. Channels can be made from split square or rectangular tubing, or even split pipe if somewhat larger than the specified channel. You could even fabricate your own 20 Foot Aluminum Boat Plans Note sectional shapes from built-up flat bar.
Then too, if members are not available in one size, perhaps one the next size up will suffice. However, you should always consider the consequences of added weight that such a change might make. Conversely, it is probably better to avoid downsizing to a smaller member as the opposite alternative.
To the novice, there is a bewildering 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note array of aluminum alloys available. But for the welded aluminum boat, the choices narrow down to the so-called marine alloys in 20 Foot Aluminum Boat Plans Note the and series, the latter typically being extrusions. Yet even within these series there are still many alternatives. But the 20 Foot Aluminum Boat Plans Note most common, readily available, and suitable for welded boat hulls include: H32 H34 H H32 H H However, the designer may have already taken this into consideration if is specified.
Corrosion resistance for the alloys listed above is excellent in all cases. The 20 Foot Aluminum Boat Plans Note20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note ng> material has good corrosion resistance also and is commonly used for extruded shapes. Early aluminum boats were often made with closely-spaced transverse frames with few, if any, longitudinals, a carry-over from traditional wood boatbuilding no doubt. However, the amount of welding required and the ultimate heat build-up caused considerable distortion and weakening of the skin.
The more enlightened approach used today emphasizes 20 Foot Aluminum Boat Plans Note longitudinal stiffeners fairly closely spaced with these crossing more-widely spaced transverse frames only as required to maintain hull shape.
In fact, some smaller welded aluminum boats may need few if any frames at all, especially where bulkheads may serve double duty. The 20 Foot Aluminum Boat Plans Note preferable approach is for transverse frames not to make contact with the shell plating other than perhaps at limited areas 20 Foot Aluminum Boat Plans Note along the chine or keel. About the only case where a transverse bulkhead needs to make continuous plating contact is if 20 Foot Aluminum Boat Plans Note it is intended to be watertight.
Even then, such a practice tends to distort the plating and is often readily visible on the outside of the boat. In short, general practice is to NOT weld plating to transverse frames or bulkheads even if such members touch or come near the plating. The chine is the junction between the bottom and side on a 20 Foot Aluminum Boat Plans Note v-bottom or flat bottom boat.
On high-speed planing boats, this corner should be as crisp are possible, especially in the aft half of the hull. The reason is that water should break free from the hull to reduce frictional drag at 20 Foot Aluminum Boat Plans Note speed, and not climb up the topsides. As shown before, Fig.
Otherwise, a backing member is largely optional. If a special Plans Aluminum 20 Boat Note Foot 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note extrusion as discussed before is available, these are acceptable. Side and bottom plating fit into the slots which are then welded continuously. From an appearance standpoint, a continuous inside weld looks best. However, such extrusions are often proprietary items or otherwise prohibitive in cost, and a problem to buy and ship in small quantities. Completing the ends of such extrusions where they join to transom and stem areas is also not always easy for the builder making a single boat.
However, if the protruding Aluminum Boat Foot 20 Note Plans 20 Foot Aluminum Boat Plans Note flange is too pronounced, there may be a tendency to hang up on rocks in certain boats such as whitewater Foot Boat Plans 20 Aluminum Note boats, or snag debris and catch pilings in other types of boats depending on their use. Otherwise, round bar bends around 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note frames easily and gives a well-defined boundary to work to when fitting side and bottom plates. A temporary chine backing member may help in this regard. In this case the bottom is fitted first and cut with care along the chine line 20 Foot Aluminum Boat Plans Note a temporary backing member may aid in fitting.
Then topsides are installed, letting the edge overhang the junction a distance as 20 Foot Aluminum Boat Plans Note required to form the spray deflector flat. While a good design, this configuration also takes care to assure fair lines. As 20 Foot Aluminum Boat Plans Note mentioned, on the modern aluminum hull, most plating is reinforced by longitudinals. While a good set of plans will specify what to use for these members, this does not necessarily rule out another alternative if what is specified is not available.20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note
These are available in many sizes, often in the form of extrusions with radiused edges that facilitate welding, or you can 20 Foot Aluminum Boat Plans Note cut your own from plate. Other stiffeners are often extruded shapes that can get costly and may not be as readily available in the sizes needed.
When installing longitudinals, bending can present problems depending on curvature and member type. One approach some builders take to reduce bending effort is to gore members along their flanges as in Fig. This idea is sound, but the execution takes care to assure fair curves. Good practice also calls for radiusing the corners at the gores slightly to 20 Foot Aluminum Boat Plans Note minimize hard spots against the plating. Avoid over-welding, and completely around the ends of each cut. This allows a strong fillet weld on both sides of the junction the inside weld can be intermittent.
A simple corner junction here as in 20 Foot Aluminum Boat Plans Note Fig. In fact, some builders extend the bottom plating considerably past the transom on faster planing hulls to form integral non-adjustable Aluminum Boat Plans Note 20 Foot 20 Foot Aluminum Boat Plans Note trim tabs.
These can later be bent down slightly if required for best performance and then bracketed to the transom once an optimum position has been found. Transom thickness technically need be no more than that of the side or bottom plating. Additional Note Boat Foot Aluminum 20 Plans thickness may be required � at least in the area of the cut-out � either through the use of doublers 20 Foot Aluminum Boat Plans Note Boat 20 Plans Note Aluminum Foot or thick inserts.
A thicker insert is preferable at a cutout to avoid the need to seal joints between doublers by 20 Foot Aluminum Boat Plans Note welding. Where thin plating meets thicker plating, bevel the thicker edge at a slope equal to at least three times the thickness of the thinner plate see Fig.
The insert should have rounded corners rather than being a hard square or rectangular shape. There is an on-going debate as to whether welded aluminum boats should be made as light as possible via Foot 20 Plans Boat Aluminum Note light plating and framing but with more of it , or with heavier plating using minimal but also somewhat huskier framing members.20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note
A boat built with light plating and framing is lighter in weight for more-economical operation, has a higher speed for a given power, is more-easily trailered, has greater payload, and because it has less material, will cost less.
First, there is a natural tendency among builders in any material to over-build and second-guess the designer, even when a boat uses the heavier plating 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note approach initially. The typical idea is that if so much is good, then a little more must be better. The result is that such boats weigh more than the designer predicted. You guessed it � NOT the builder. Much depends on the boat and its expected service. For pleasure boats, I tend to favor lighter scantlings, but for more rigorous duty, heavier construction may be justified.
Mangusta 20 by Bateau. Fast and light, deep vee. Extreme Flats 20 by Bateau. Panga 20 by 20 Foot Aluminum Boat Plans Note 20 Foot Aluminum Boat Plans Note Bateau. Pilot 21 by Bateau. Open 20 Foot Aluminum Boat For Sale Visit Pilot 21 by Bateau. Redwing 21 by Chesapeake Marine Design Power launch. Classic 21 by Bateau. Nina 22 by Bateau. Phantom 22 by Bateau. Panga 22 by Bateau. Novi 23 by Bateau. Down East Cruiser 23 Aluminum Plans Foot 20 Boat Note Plans Boat Aluminum Note 20 Foot by Bateau. Abaco 23 by Bateau.
Single or twin outboards, bracket option. Carolina Sportfish 23 by Bateau. Maia 24 by Bateau.
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