JETCRAFT. Водомёт. Водомётный движитель. Теория.

Лодка. На что обратить внимание. Руководство пользователя. (Boats: What to Look For . Buyer guide)

Главная страница

Лодка. На что обратить внимание. стр. 1, 2, 3, 4 , 5, 6, 7

     Marathon Marine - web.  Cтатья очень доходчиво рассказывает НА ЧТО ОБРАТИТЬ ВНИМАНИЕ при покупке лодки или водомётного катера.

NEW. Росомаха (img) русский конкурент Harbercraf / Jetcraft

 

Byuer Guide Руководство покупателя

 

Фотографии с выставки "MIBS 2009"

Закон и катер. Постановка на учёт катера со стационарным двигателем.

Калькулятор(Calculator)

дюймы в сантиметры

Словарь ( Dictionary ).

Сравнить ( Compare Boats )

Теория ( Theory ).

 

Форумы на тему... с переводом.

 

Harbercraft

1875 J-Max White Water (img)

 

2075 White Water

(img)

 

1875 J-Max XS (img)

 

2175 XS Фотографии с выставки "Охота и рыбалка - 2008"

 

Marathon Marine and Northwest Jet Boats (link)

 

PHANTOM Jet Boats (link)

 

RiverPro®. (link)

 

North Silver PRO 675Jet lnk

 

Росомаха (img)

 

Tom 525. Томь 525.

 

Коллекция ссылок на тему: водомёты для судов (Links).

5 White Water test drive

Курс доллара

 

 

 

 

Друзъя

 

207

 

Lateral Stability During Planing Turns Поперечная устойчивость во время  плоского поворота.

Because of its large convex surface the Radius Bottom also generates tremendous lift -

 

much like the flat bottom hull but without any of its nasty habits. To hold the hull

 

throughout a turn lateral stability is provided by strakes each of which are specifically

 

sized and placed on the bottom. These strakes contribute to the lateral traction of the hull

 

giving our boat its extreme tight turning performance. More lift translates directly to

 

more payload capacity, less fuel consumption and a faster more nimble hull. Unlike the V

 

hull the Radius Bottom also creates substantial positive lift while in a turning maneuver.

 

This results in a solid stable cornering boat with the attitude of the hull remaining flatter

 

throughout the turn. In addition the combination of the Radius Bottom, high rising chines

 

and aggressive bow entry produces a solid dry riding boat that lifts over chop yet slices

 

through waves. It is truly the best of both worlds.

 

The ride, lift strength and stability of the hull is such that we have equipped a number of

 

standard 12 degree deadrise Radius Bottom hull’s with outboard offshore brackets using

 

225 HP outboards. These boats are operating in the severe conditions of the offshore and

 

inland waterways of Alaska with superb performance reported by the operators.

 

Bottom Shape and Jet Intake

 

Planing hulls have many different shapes or lines. In a water jet powered craft, design

 

errors that would not show themselves with other drive types will become critical. Flow

 

to the jet drive unit is extremely important. One of the most significant advantages of the

 

Radius Bottom is its ability to interface with jet drives. The Radius Bottom transitions

 

perfectly into the pump intake area of the jet drive. This delivers solid water to the eye of

 

the impeller resulting in a dramatic increase on pump efficiency and boat performance.

 

Simply jamming a jet drive into the rear of a V hull will not work. The flow into the

 

pump intake must be a clean, non-aerated flow at all time - in all conditions. Since the V

 

hull is by far cheaper to build than the Radius Bottom hull most builders “transition” a V

 

keel to accommodate the needs of the jet drive. The easiest way to do this on a V hull is

 

to incorporate a Delta pad (flat triangle) into the bottom. Most manufacturers do this the

 

easiest, least costly way by forming the Delta pad from the stem cut out (where the bow

 

begins to rise) all the way back to the stern. This is usually done with a press brake. Many

 

times it is done by splicing and welding the Delta (triangle) into the bottom. Either way

 

they are weakening the bottom in the process.

 

The Delta pad, because it is flat, will generate lift when the hull is planing but it will also

 

exhibit the same bad characteristics of the flat bottom. It will also have the tendency to

 

cavitate (ingest air) in rougher conditions. The Radius transition can best be described as

 

a spoon shape. Whether the boat is on plane or taking off from a standing start the jet

 

drive loads beautifully. Look under a few boats and see the difference for yourself.

 

Boats: What to Look For. НА ЧТО ОБРАТИТЬ ВНИМАНИЕ при покупке лодки.

I

Introduction.

Введение

Welded Boats in General:

Сварные лодки в общем

Our Bias

Наши предпочтения

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  Дельфинирование.

 

The Hook.

 

Spray Line?.

 

Boat Materials: Aluminum versus Fiberglass .

 

Cost differences between glass and aluminum .  Сравнение стоимости стекловолокна и алюминия.

Types of Aluminum. Типы алюминия.

 

Material Thickness

 

A Word about Welding

 

Suck marks, caterpillar tracks

 

Folded, ‘Origami’ Construction

 

Hull Design

 

Delta Keel.

 

Deadrise (Vee)

 

Planing Hull Bottom Types Корпус с дном плоского типа

 

Constant deadrise V (including modified V hulls)

  

Flat bottom hulls (8 degrees deadrise or less)

 

Bow Entry Types. Тип носа катера

 

Shallow Entry

 

Sharp Entry

 

Radius Bottom Круглое дно.

 

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

Силовая установка.

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:

 

 

Водомётный движитель. ТЕОРИЯ.

 

Адрес для переписки:

Spiridonov S. E.

Главная страница

Лодка. На что обратить внимание. стр. 1, 2, 3, 4 , 5, 6, 7

JETCRAFT. Водомёт. Водомётный движитель. Теория. Лодка. На что обратить внимание. Руководство пользователя. (Boats: What to Look For . Buyer guide)