BIETE: STERN JACK

[pachanga-22]

Biete STERN JACK für Alpha One.

in gebrauchten gutem Zustand.

inkl. der verlängerten Hydraulikzylinder.

Preis VS.

[arriva]

Wäre evtl was für Forums Mitglied "Joker"

[Chaparral SX]

Wo liegen die Vorteile von so einem Stern Jack



hery9

[NORDIC POWERBOATS EUROPE]

The idea about the stern jack was well thought but it doesn't work on every boat...

Found some info from the manufacturer. Consider it as +- setback for a stern drive


"The Land & Sea Stern Jack is designed for boats that require a substantial amount of trim to achieve top speed. It provides the effects of a standoff or setback box with an additional feature.
The Stern Jack mounts after the outdrive gimbal housing rather than before it, as is the case with a typical setback box. This geometry results in the prop being raised vertically higher in the water when trimming out than achievable with typical setback boxes at the same trim angle. Similarly, trimming in results in the prop being vertically deeper in the water at the same trim angle. For some boats and set-ups, this combination of setback and vertical height can improve top speed and handling.
Moving the prop farther back from the transom has several effects. It moves the weight of the outdrives farther aft which also moves the center of gravity of the boat aft. This can allow an unstepped hull to rise higher in the water as speed increases before the center of pressure moves behind the center of gravity and trim out is required to hold up the bow. This effect alone can result in an increase in top speed.
Since water rises off the transom of a boat, moving the prop aft puts it in smoother, deeper water. In addition to improving the thrust generated, the propeller can also be raised higher, changing the geometry of the thrust force relative to the vertical height of the boat's center of gravity.
This can have both positive and negative effects, depending on the boat and its set-up. Increasing the prop's vertical height relative to the boat's center of gravity reduces bow lift at neutral trim. This may have a negative effect on boat speed and handling if the boat needs more bow lift.
It can also make it possible for the thrust vector to pass through the boat's center of gravity at some negative trim angle. This can provide a lifting component of force without changing the boat's angle of attack. Raising the boat in the water reduces wetted area and therefore increases top speed. Many race boats, equipped with surface props, run at negative trim angles to achieve top speed.
It should be noted that moving a prop farther aft could alter the angle of the water impinging on its blades. This can affect thrust magnitude and drive trim geometry, either favorably or unfavorably. Propeller optimization may be necessary for best results.
Moving the propeller aft increases the leverage that the thrust force has in influencing the angle of attack with trim. It may be possible to effect bow or stern lift at smaller drive trim angles than required with the prop closer to the transom. In this case, more thrust is available in the forward direction to increase boat speed.
As well as providing setback, the Stern Jack also increases vertical prop travel with trim. This produces a combination of all the effects previously mentioned. With the prop deeper in the water, improved propeller bit along with thrust geometry relative to the boat's center of gravity can improve acceleration out of the hole."

[Checkmate-Team]

Ich hatte mal einen an meiner Stingray den habe ich in die Schweiz verkauft.
Wo kommt der her ????????

[oneill52]

Biete STERN JACK für Alpha One.

in gebrauchten gutem Zustand.

inkl. der verlängerten Hydraulikzylinder.

Preis VS.

was soll das Teil kosten habe Grosse Intresse
oneill52

[Andiamo]

Checki,

der kommt von meiner Pachanga, die ich dem Anbieter verkauft habe vor ein paar Jahren...und ich habs von Cyrus...kleine Welt, was?

Das Teil hat gut funktioniert an der Pachanga...versteh nicht warum er es verkauft...einzige vernünftige Erklärung wäre Umrüstung auf Bravo....

Grüße

Andiamo

[pachanga-22]

Jepp!

wir sind auf Bravo One umgestiegen.

Dann kanns Christkind endlich nen Blower bringen!

gruß pachanga-22

P.S Am 26.03 beginnt für uns die Saison am Gardasee. Da ist die Luft noch schön kalt und der Ansaugtrichter kann mehr Luft atmen!!!