lost in power ???

[nautical]

Hi guys. I did a power analysis in HullSpeed for a 30 m cruise at 14 knots. and the power required seems to be like 600 KW (about 1000hp) considering an overall propulsive efficiency of 50 %

and i am choosing 2 of these engines

http://www.volvo.com/volvopenta/sing...9-500/spec.htm

Now I checked one of the propcalc data sheets from the forum. And it says i will require 2400 Hp to achive an speed of 14 knots. Isnt this way too much power.

Can someone pls help me with this and also guide me to estimate a suitable propeller. If some have pdfs or anything that could be of help pls send me

Thanks to all your help

[kjell]

Nautical.
Have a look to this thread. It maybe can help you to resolve your calculations.
Easy calculations
Kjell

[nautical]

Kjell,

Thaks for replying,

well if i get one of those programs it would be very helpful. can I get it mailed if I send you a mail as you have mentioned it. there.

[kjell]

Hi Nautical.
If you send me some details of you self and your post address and the E-mail.
I can send you the program as WinRAR. It works on WINDOWS
Kjell Dahlberg