JETCRAFT. Âîäîì¸ò. Âîäîì¸òíûé äâèæèòåëü. Òåîðèÿ.

Ëîäêà. Íà ÷òî îáðàòèòü âíèìàíèå. Ðóêîâîäñòâî ïîëüçîâàòåëÿ. (Boats: What to Look For . Buyer guide)

Ãëàâíàÿ ñòðàíèöà

Ëîäêà. Íà ÷òî îáðàòèòü âíèìàíèå.

NEW. Ðîñîìàõà (img) ðóññêèé êîíêóðåíò Harbercraf / Jetcraft

Byuer Guide Ðóêîâîäñòâî ïîêóïàòåëÿ

Ôîòîãðàôèè ñ âûñòàâêè "MIBS 2009"

Çàêîí è êàòåð. Ïîñòàíîâêà íà ó÷¸ò êàòåðà ñî ñòàöèîíàðíûì äâèãàòåëåì.

Êàëüêóëÿòîð(Calculator)

äþéìû â ñàíòèìåòðû

Ñëîâàðü ( Dictionary ).

Ñðàâíèòü ( Compare Boats )

Òåîðèÿ ( Theory ).

Ôîðóìû íà òåìó... ñ ïåðåâîäîì.

Harbercraft

1875 J-Max White Water (img)

2075 White Water

(img)

1875 J-Max XS (img)

2175 XS Ôîòîãðàôèè ñ âûñòàâêè "Îõîòà è ðûáàëêà - 2008"

Marathon Marine and Northwest Jet Boats (link)

PHANTOM Jet Boats (link)

RiverPro®. (link)

North Silver PRO 675Jet lnk

Ðîñîìàõà (img)

Tom 525. Òîìü 525.

Êîëëåêöèÿ ññûëîê íà òåìó: âîäîì¸òû äëÿ ñóäîâ (Links).

5 White Water test drive

Êóðñ äîëëàðà

Äðóçúÿ

207

A Word about Welding

You are buying a welded boat. The quality depends on the welding. Welding depends

 upon proper heat selection, speed of weld, type of material being welded etc. A properly

 welded and reinforced boat will last for years – an improper one will develop cracks and

 other problems.

 Suck marks, caterpillar tracks

 Welding requires the (melting and fusion and mixing) of the two pieces being welded

                                   (ïëàâëåíèå è ñëèÿíèå è ïåðåìåøèâàíèå))

together with a (filler wire). Weld too hot and you burn through and distort the material.

                (çàïîëíÿþùàÿ ïðîâîëîêà)

Weld too cold and you do not get fusion and melting of the two pieces – you just get

 melted filler wire sitting on top of the two pieces.

 Proper fusion in materials up to 1⁄4” thick shows up on the opposite side of the material

 as (distortion) lines and marks. These marks are generally call ‘suck marks’ or ‘caterpillar

   (èñêðèâëåíèÿ)

tracks’. (Eliminating) these in the welding process requires minimizing heat and therefore

           (Óñòðàíèòü)

fusion. It also minimizes the strength of the (joint). In other words, one way to make a

                                                            (ñîåäèíåíèå)

cosmetically more (appealing) boat is to ‘cold weld’ the boat. The cheapest, easiest and

                            (ïðèâëåêàòåëüíûé)

weakest weld is a cold weld. Stay away from boats like this unless you are a light duty

 user, as they will not stand up.

 If you are looking at a weld on a side for example, on all the quality boats you will see

 the weld line running down the side. A certain amount of paint preparation and bodywork

 can reduce the line, but it generally does not disappear. If you do not see this line where

the welds are make sure you are getting a boat that has been properly welded.

If you do see a boat where you cannot see that line it means:

� The boat was cold welded

� Substantiation body work was done to hide the distortion

� The material is thick enough to hide the line

� There is no joint there.

On the flip side, welding weakens aluminum. When heating the aluminum strength is

taken out of material. The more heat that is used to weld the boat, the weaker the

aluminum becomes. This is one of the reasons that it is important to use higher grades of

material for structural components. The initial higher strength or thickness of the material

helps compensate for the reduction in strength after welding.

That is why Marathon uses .160 for stringers and .125 for sides, in order to compensate

                                           4,064 ìì                    3,175 ìì

for the welding.

Folded, ‘Origami’ Construction

There are techniques that (rely) on folding the boat ‘origami’ style with minimal welding.

                                  (ïîëàãàåòñÿ)

In order to fold the boats, softer and generally thinner alloys have to be used. These softer

and thinner alloys are much more susceptible to cracking out and failure than what

Marathon uses.

If you look at most brands of welded boats, you will find that this technique is rarely

used. (Besides the drawback) of using softer alloys, these boats rarely have (rub rails). These

    (Êðîìå òîãî îòðèöàòåëüíàÿ ñòîðîíà)                                           (îò òðåíèÿ îãðàäà – ïðèâàëüíûé áðóñ?)

protect the sides and paint from abrasion and scratches when rubbing against things like

docks and other boats. Secondly they do not have the harder alloys protecting and

strengthening the gunwales.

Boats: What to Look For. ÍÀ ×ÒÎ ÎÁÐÀÒÈÒÜ ÂÍÈÌÀÍÈÅ ïðè ïîêóïêå ëîäêè.

I

Introduction.

Ââåäåíèå

Welded Boats in General:

Ñâàðíûå ëîäêè â îáùåì

Our Bias

Íàøè ïðåäïî÷òåíèÿ

Shop for a Manufacturer First

Look in the used boat ads

Judging the Production Staff

Manufacturer Reputation

Buying a Welded Boat for the First Time

Know the Boat you want

There is no Perfect Boat

Take a test ride.

Acceleration out of the hole

Bottom Width and Engine Size and Type.

Turning ability.

Stability at Speed: Porpoising versus bow down  Äåëüôèíèðîâàíèå.

The Hook.

Spray Line?.

Boat Materials: Aluminum versus Fiberglass .

Cost differences between glass and aluminum .  Ñðàâíåíèå ñòîèìîñòè ñòåêëîâîëîêíà è àëþìèíèÿ.

Types of Aluminum. Òèïû àëþìèíèÿ.

Material Thickness

A Word about Welding

Suck marks, caterpillar tracks

Folded, ‘Origami’ Construction

Hull Design

Delta Keel.

Deadrise (Vee)

Planing Hull Bottom Types Êîðïóñ ñ äíîì ïëîñêîãî òèïà

Constant deadrise V (including modified V hulls)

Flat bottom hulls (8 degrees deadrise or less)

Bow Entry Types. Òèï íîñà êàòåðà

Shallow Entry

Sharp Entry

Radius Bottom Êðóãëîå äíî.

Lift Forces Explained.

Lateral Stability During Planing Turns

Bottom Shape and Jet Intake

Planing Ability

Reverse Chines

Bottom Width: Flair is not everything

No Trim.

Hull Construction Standards

Shallow Water Operation

No Exposed Drive

Safety

Thrust line and Center of Gravity In line

Propeller Torque is Different than Impeller Torque

Propulsion Resistance.

Power Plants

Ñèëîâàÿ óñòàíîâêà.

Derived from Impeller Curves.

RPM Curve Derivation

Conclusion

Hull Resistance.

Boat attitude..

Jet Drives

How jets work .

Impeller

Cut.

Cut, Speed and Load

Wear ring.

Nozzle

Stator.

Hard Anodized.

Cavitation .

Intake

Seals

Mixed flow

Axial flow.

Outboard jet:

Inboard jets:

So, what is the best jet?

Corrosion.....

UHMW...

Jet Diagnosis...

Rattle at Idle (V8 boats)

Speed too low for a Given RPM.

Poor acceleration or ‘holeshot’, combined with high top end

Definitions.

Porpoising .

Chine walk: 9

Ram effect .

Static thrust:

Ãëàâíàÿ ñòðàíèöà

Ëîäêà. Íà ÷òî îáðàòèòü âíèìàíèå.

JETCRAFT. Âîäîì¸ò. Âîäîì¸òíûé äâèæèòåëü. Òåîðèÿ. Ëîäêà. Íà ÷òî îáðàòèòü âíèìàíèå. Ðóêîâîäñòâî ïîëüçîâàòåëÿ. (Boats: What to Look For . Buyer guide)