8
SE 30/125S2 - SE 40/125S2
5408-2 - 2018
Master
4
Tunnel installasjon på seilbåter
N
Mange seilbåtskrog er bygget for å oppnå høy fart. De har brede skrog
som ikke stikker dypt i baugen. Skrogtypen gjør det vanskelig å installere
en thrustertunnel på vanlig måte, spesielt med tanke på å plassere den
langt nok frem (Fig. 1).
Thrustertunneler kan allikevel installeres i de fl este seilbåter. Dette gjøres
ved å la en del av tunnelen stikke ut i underkant av skroget. Tunnelen er
sterk nok til dette, og thrusteren blir plassert lav nok og langt nok fremme.
Dette gjøres ved at øvre halvdel av tunnelen støpes inn i skroget, tun-
nelen styrkes i underkant ved å støpe en kul rundt tunnelen og jevne den
ut mest mulig.
Denne metoden brukes av noen av de helt største seilbåt-produsentene i
verden, de viser til at den ikke gir utslag på fart under normal seilas.
Denne installasjonen kan også være gunstig for båter med fl ate bunner,
for å unngå ekstremt lange tunneler og store ovale tunnelåpninger.
Tunnel installation in sailboats
EN
Many sailboats have a racing type hull which means that it is very fl at bot-
tomed and has a very shallow draft in the bow section. It is thereby very
diffi cult not to say impossible to fi t a tunnel thruster the usual way, at least
as far forward in the hull as a thruster should be (Fig. 1).
However, it is possible to install a tunnel thruster in most sailboats, even
when the hull does not directly support the fi tting of a tunnel.
This is done by fi tting the tunnel halfway into and halfway under-neath the
existing hull and then strengthen it and smoothening the water fl ow by
moulding a bulb around / underneath the tunnel.
This will allow installation in good position on the boat, maintaining the
reliability and space advantages of a tunnel thruster.
This installation is being used by some of the world’s largest sailboat
builders, and has been proven to give little to no speed loss for normal
cruising.
This can also be a good installation method for fl at bottomed barges to
avoid extremely long tunnels and huge oval tunnel openings in the hull.
16
SP 75 Ti / SP 95 Ti / SP 125 Ti
2.5.1- 2007
Segelboote weisen häufig einen Rumpf in Rennform auf, was
einen sehr flachen Rumpf im Bugbereich bedeutet. Es ist daher
schwierig oder fast unmöglich, den Tunnel an der gewünschten
(effektivsten) Stelle, also möglichst weit vorne im Bug zu plazieren
(Fig. 1).
Trotzdem ist es vielfach möglich unter diesen Bedingungen eine
Bugschraube einzubauen, auch wenn der Tunnel damit nicht völlig
vom ursprünglichen Rumpf umgeben ist.
Der Tunnel wird zur Hälfte in den bestehenden Rumpf integriert,
die andere Hälfte geht über diesen hinaus. Der Tunnel muß nur
noch verstärkt und strömungsgünstig abgerundet werden.
Dies erlaubt eine Installation in geeigneter Position bei Nutzung
der Zuverlässigkeits- und Platzvorteile einer Tunnelschraube.
Diese Installationsart wird von einigen der weltweit führenden
Segelboothersteller verwendet und führt meistens nur zu einem
äußerst geringen bzw. gar keinem Geschwindigkeitsverlust.
Diese Bauweise ist auch für Barkassen (z.B. Flußboote) mit
flachem Bug geeignet, um einen zu langen Tunnel und große
ovale Tunnelöffnungen im Rumpf zu vermeiden.
Installation in Segelbooten
D
Tunnel installation in sailboats
Fig. 1
GB
M
in
�
�
�
�
�
☺
☺
☺
☺
☺
Pos. B
Pos. A
�
�
�
�
�
☺
☺
☺
☺
☺
Many sailboats have a racing type hull which means that it is very
flat bottomed and has a very shallow draft in the bow section. It is
thereby very difficult not to say impossible to fit a tunnel thruster the
usual way, at least as far forward in the hull as a thruster should be
(Fig. 1).
However, it is possible to install a tunnel thruster in most sailboats,
even when the hull does not directly support the fitting of a tunnel.
This is done by fitting the tunnel halfway into and halfway under-
neath the existing hull and then strengthen it and smoothening the
water flow by moulding a bulb around / underneath the tunnel.
This will allow installation in good position on the boat, maintaining
the reliability and space advantages of a tunnel thruster.
This installation is being used by some of the world’s largest sailboat
builders, and has been proven to give little to no speed loss for
normal cruising.
This can also be a good installation method for flat bottomed barges
to avoid extremely long tunnels and huge oval tunnel openings in the
hull.
