Easy calculations

[kjell]

Many times it is useful to have a simple program to calculate the most important factors for Displacement hull , Semi displacement hull and Planning boats.
Boat speed.
Power requirement.
Propeller size.
For the last 30 years I have been using a program made by me for resolving Speed , Power and Propeller problems on Yachts. It is in Spanish but it so easy to use. It is working with metric dimensions.

[Tim B]

I agree, that's why I have a Delft series resistance code and Hazen's model. Other bits and peices to write include Savitsky, and Holtrop and Mennon resistance codes. Now if someone could save me the time and it didn't cost me a fortune, AND it ran under Linux I might be quite interested. Naturally, you'd have to do it before I'd finished writing it.

Of course, if you've already done it, post a link.

Tim B.

[kjell]

To calculate the boat speed and needed power you only have to introduce the LWL in meters and the Weight in ton.

[kjell]

To calculate the boat speed and needed power you only have to introduce the LWL in meters and the Weight in ton.

[kjell]

To calculate the boat speed with the power have you only have to introduce the Weight in ton and the engine power.

[kjell]

Based on the speed and power calculation it is easy to calculate the propeller.

[CGN]

link?

[kjell]

This program can be yours free.
Contact me on kjellgood@gmail.com and give me your comments.

[Tim B]

Yes...

I think the alpha version of DSRC and even the savitsky spreadsheet that is around might be just slightly more advanced than the resistance algorithm. Certainly the Holtrop and Mennon method requires a little more data.

As for the propeller design, It could be very useful, but quite often it is just as easy to work off a propeller chart, unless specifically designing a propeller, in which case we use the big letters....CFD.

I'm not bashing your work, but for most design purposes we need an accurate (preferably tank test checked) piece of code.

Tim B.

[kjell]

I am now 72 years old. I have been working for over 30 year in Mallorca Spain resolving propulsion problems on yachts up to 30 meters. The need of to have a calculating tool with an easy way of verify Boat Speed Engine power and propeller size. I collected the formulas from the best Marine Engineers and added them to this program. I would like that this Tool continue in the hand of other Marine Engineers around the World. That is the reason why I am giving it free.
This program covers calculations of Displacement, Semi- Displacement and Planning hull. With this program it is possible to verify if your boat are making the Speed or if the Engine power is sufficient or if your propeller is the proper size. The accordance is over 90% and has been tested by many Marine Engineers. The program is made in Spanish and in metric system. Translating the different Data input to your Language it is very easy to use.
Kjell Dahlberg

[Tim B]

Would you like to post the source-code? I'll have a look at translating it for you

Tim B.

[kjell]

I can’t email the source-code to you so pls. give me your post address and I will send you a CD by post. I can include an English handbook if you don’t have a Spanish Dictionary.

[kjell]

The Power Factor Method for Calculating Propellers in my program
is based on the BP delta Method

[Davor]

Try my demo-program SeaPower www.sea-power.net

Davor



I agree, that's why I have a Delft series resistance code and Hazen's model. Other bits and peices to write include Savitsky, and Holtrop and Mennon resistance codes. Now if someone could save me the time and it didn't cost me a fortune, AND it ran under Linux I might be quite interested. Naturally, you'd have to do it before I'd finished writing it.

Of course, if you've already done it, post a link.

Tim B.

[Tim B]

kjell, Sorry I haven't e-mailed you, I got the code and I'll have a look at it in the next week or so (I hope).

Cheers,

Tim B.

[Tim B]

kjell, Sorry I haven't e-mailed you, I got the code and I'll have a look at it in the next week or so (I hope).

Cheers,

Tim B.

[kjell]

Sorry to borrow the thread , but Mr.KJELL, I got your letter CD, Thanks it work fine, I have my guy check out the program.................... you really honor your word and work............ It a pleasure knowing you.:)

Wellydeckhand

Thanks Wellydeckhand
If you need any help with the program pls. contact me on
kjellgood@gmail.com

[kjell]

I like to give my thanks to everyone that has contact me for the free Easy calculating program The program is now in position to be tested around the world.
I hope to have your comments soon.

[Arcan3]

Kjell.

is there anyway i could get the program too? no source code just the program.. for personal use... thank you in advance either way...

[kjell]

Kjell.

is there anyway i could get the program too? no source code just the program.. for personal use... thank you in advance either way...

Yes.

Send me your name and post address to.
kjellgood@gmail.com

[deki, bre]

Kjell, have you tought to post your software as open source? On sourceforge or similar site? It may be guaranty that it will regulary updated, used,....

Regards,

Deki

[kjell]

Kjell, have you tought to post your software as open source? On sourceforge or similar site? It may be guaranty that it will regulary updated, used,....
Regards,
Deki

No. This is one of personal gift to the interested people. I am working with an English version and I will let you know when it is ready.
Kjell

[northerncat]

what happened to the english version
sean

[kjell]

what happened to the english version
sean

I am working with the English version but due to health problems it will take time before it is ready. The Spanish version is very easy to use with the English Handbook.
Nobody has had any problems.

Kjell

[Arcan3]

:( maybe it got lost in the mail :|

[kjell]

:( maybe it got lost in the mail :|

Hi Marcos.
Thanks for your interest in my program.
The propcalc program was e-mailed to you the 07.05.2007.
Pls. confirm your E-mail address to.
kjellgood@gmail.com
and I will send you the program again.
Regards
Kjell

[kjell]

The free program offer is now ended and I like to thank all of you who has demonstrate your inters in my PROPCALC Program.

Otto Italy.
Welly Indonesia.
Tim B England.
Robert USA
Jörg Germany
Douglas USA
Guillermo SPAIN
Sander Te Netherlands
Delane Japan
Kobus Mozambique
Florent France
Jürgen Sverige
Robbie Australia
Randy USA
Roberto Italy
Marcos Venezuela
Ivan Croatia
Francisco SPAIN
Jerry
Manuel
Arcan3
Paul USA
FAUSTO PERU
Jeff USA
John
Nautical Rep of Maldives
Oktay TURKEY
Gilbert Puget Island
Kevin United Arab Emirates

Kjell Dahlberg, Mallorca, SPAIN.

[dimzik]

Hi Marcos.
Thanks for your interest in my program.
The propcalc program was e-mailed to you the 07.05.2007.
Pls. confirm your E-mail address to.
kjellgood@gmail.com
and I will send you the program again.
Regards
Kjell

I`ll be glad to receive your propcalc program to my e-mail: "perfect-gent@gala.net"
regards
Dimzik

[irandar]

Greetings,

I have been fooling around with calculations to get the shaft power
required for a particular boat. Most methods use the inputs of
water-line length and weight. In the book, Propeller Handbook, by Dave
Gerr, Ch 2 outlines a method involving displacement ratio to get the
speed-length ratio and then using this to get the lb per hp required.
What makes me wonder about the method is that the results show weight
to have hardly any influence on the resulting required hp. I have
programed the few equations using a simple software available on the
web, so that I can get curves of hp versus length for various values
of weight. I wonder if any of you have experience with such
calculations, in other words what method would you use to get the
power needed to reach hull speed? I am mainly interested in the equations used.

Thanks, Irandar

[terhohalme]

As a rule of a thumb, 5 hp/tonne is enough for hull speed. Propeller efficiency (50-60%) and some service is included. You must use the mass of fully loaded boat.

[indra.s]

Dear Mr.Kjell

I've sent an email to you. I was very attracted to the program you have .. please send me the program ... thank you ...

Best Regards

[kjell]

Re; free PROPCALC program.
This offer ended 2007. I have now an English version for sale.
Individual calculation can be made for an economical price.
Kjell