JETCRAFT. Водомёт. Водомётный движитель. Теория.
Лодка. На что обратить внимание. Руководство пользователя. (Boats: What to Look For . Buyer guide)
Лодка. На что обратить внимание.
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.
дюймы в сантиметры
Форумы на тему... с переводом.
1875 J-Max White Water (img)
2075 White Water
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)
North Silver PRO 675Jet lnk
Tom 525. Томь 525.
Boat Materials: Aluminum versus Fiberglass Материалы для катера
The boats in general section applies to any boat. Why should you buy welded aluminum?
As can be seen from the above, aluminum is superior as a construction material to
fiberglass for structural components as:
� It has high impact resistance
� There is no osmosis risk
� It has high rigidity
� It is lighter.
� It has a high strength to weight ratio.
Cost is a misleading comparison. Although pound for pound, aluminum is more
expensive than fiberglass, one needs substantially more fiberglass to obtain an equally
strong hull. For example, it takes about a 3,000- 4,000 lbs. of fiberglass to equal the
strength of a 1,000 pound aluminum hull. There are a few glass boat builders who build
this strong a hull. When you check their prices you will find they cost substantially more
than the aluminum hull.
Secondly, although the glass hull may initially be as strong, it will not have anywhere
near the impact resistance of aluminum.
Thirdly, although they may be able to handle an initial impact, the collision creates stress
cracks which allow osmosis to set in and the hull will deteriorate over time. Sun, stress
cracks and osmosis will all wreak havoc over time. Therefore, over time fiberglass’
Fourth, all the added weight on the glass boat creates a severe performance, fuel
consumption and power plant penalty. To push the extra weight of a glass boat a larger,
heavier more expensive engine is required. In a bit of negative circle, bigger engines need
to be even bigger to push their own weight. Bigger engines burn more fuel which requires
even more weight for fuel storage and therefore an even bigger engine. More weight
makes for slower planning and more wallowing in big water. Ask any heavy duty glass
boat owner about the performance and operating cost of their boat.
All welded aluminum boats are not created equal. Builders used different techniques and
different aluminum in their hulls. The following tells you what to look for:
� Based on 1⁄4" thickness
� Figures are minimums. Actual samples will vary. 5052 tends to have the highest
From the chart above one can see why Marathon uses 6061 for the rub rail (gunwale) joint
components and 5086 for bottoms. These are structural components that hold the boat
together. As boat powers through the water it (flexes). (Therefore) you want strength,
hardness and little bending ability in your structural components. It is the structural
components that allow the boat to keep its integrity.
How does this affect you? Ask what is in the boat.. See how it is built. Ask what
materials go into it. Why ask? Some boats use 5052 in their bottoms. Others use minimal
thicknesses and designs in their stringers. If you are a light duty user, it probably does not
make much difference. However if you (put your boat through its paces) and push it a little,
(подвергнуть испытанию/ «прощупать»)
you will see the differences show up over time as one boat will develop cracks and the
other will not.
This paper is talking about (heavy gauge) welded aluminum boats or what some call plate
(тяжёлого размера / калибра)
aluminum. The bottoms in these boats range (from 3/16” to 1⁄2”). Although some builders
(от 4,76 мм до 12,7 мм)
in this class use thinner bottoms in this class, most quality builders do not. Heavy gauge
welded boats usually see heavy use and requires the strength.
We are totally excluding boats of the light duty welded aluminum class, which are
basically a small step up from riveted boats. These builders use thin bottom material,
often 5052 and (reinforce) their boats completely differently than heavy gauge builders.
(укреплять / армировать)
Secondly, look at the material thickness and listen to the (explanations) as to what is used
Boats: What to Look For. НА ЧТО ОБРАТИТЬ ВНИМАНИЕ при покупке лодки.
Сварные лодки в общем
Stability at Speed: Porpoising versus bow down Дельфинирование.
Cost differences between glass and aluminum . Сравнение стоимости стекловолокна и алюминия.
Types of Aluminum. Типы алюминия.
A Word about Welding
Suck marks, caterpillar tracks
Folded, ‘Origami’ Construction
Planing Hull Bottom Types Корпус с дном плоского типа
Constant deadrise V (including modified V hulls)
Flat bottom hulls (8 degrees deadrise or less)
Radius Bottom Круглое дно.
Bottom Shape and Jet Intake
Bottom Width: Flair is not everything
Hull Construction Standards
Shallow Water Operation
No Exposed Drive
Thrust line and Center of Gravity In line
Propeller Torque is Different than Impeller Torque
Derived from Impeller Curves.
RPM Curve Derivation
How jets work .
Cut, Speed and Load
So, what is the best jet?
Rattle at Idle (V8 boats)
Speed too low for a Given RPM.
Poor acceleration or ‘holeshot’, combined with high top end
Chine walk: 9
Ram effect .
Водомётный движитель. ТЕОРИЯ.
Адрес для переписки:
Spiridonov S. E.
Лодка. На что обратить внимание.
JETCRAFT. Водомёт. Водомётный движитель. Теория. Лодка. На что обратить внимание. Руководство пользователя. (Boats: What to Look For . Buyer guide)