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Author Topic:   Prop Calculator

dg22 posted 09-23-2008 04:14 PM ET (US)
I found this on the web at: http://www.rbbi.com/folders/prop/propcalc.htm. You might find it useful. [Explains how to use the calculator] For my boat a 13-foot Boston Whaler with a 50 hp Evinrude [many detail of data entry deleted] it is quite accurate at 37-MPH. I have no idea how accurate this is so don’t take it too seriously. Dave

jimh posted 09-23-2008 04:52 PM ET (US)
Perhaps you are not aware of the PROPELLER CALCULATOR tool here on CONTINUOUSWAVE:
http://continuouswave.com/cgi-bin/propcalc.pl
It does the same thing but you don't need your browser to perform a lot of work. The calculator handles everything. This eliminates unanticpated results when the browser does not handle the JAVA-Script features needed to make the RBBI calculator work properly. There is no question of "accuracy" as the relationships are explicitly given for our calculator and the process is explained in detail. You should also investigate the many other resource of CONTINUOUSWAVE, beginning at
http://continuouswave.com
This discussion area is just a segment of what is available. Also, feel free to visit RBBI and post an announcement regarding the resources here.
fishgutz posted 09-23-2008 05:47 PM ET (US)
The Continuous Wave prop calculator is on the RBBI website.
jimh posted 09-23-2008 08:26 PM ET (US)
The underlying algebra of all propeller calculators is well-known and fixed by the Physics of the elements involved. Mercury has a slide rule that incorporates the relationships. They sold it years ago, long before the web and browser. I think it is still available.
The recirculating design of the RBBI propeller calculator with its five inputs was actually adapted from a financial calculator popular for figuring mortgage interest and payment schedules that was published on the web. As I recall the RBBI page used to mention that.
The Propeller Calculator at CONTINUOUSWAVE was written in modular Perl code which executes on the server, not the browser. It also makes extensive use of cascading style sheets to implement many cool features regarding use of tables in presentation. It is an unbelieveably cool collaboration between me (the alegebra and the presentation HTML code) and my son (the HTML form inputs and the modular Perl code). The Propeller Calculator formed the basis for the totally unique Crouch's Calculator, which was implemented in a similar manner.
jimh posted 09-23-2008 09:04 PM ET (US)
By the way, just in case you have not figured this out, I consider it the height of cheekiness to post a notice here on CONTINUOUSWAVE about a propeller calculator on some other website. HELLO?
dg22 posted 09-23-2008 09:44 PM ET (US)
Sorry Jim. I was not aware that you had a prop calculator on this site. I will check out the other resources that you have on this site. I come directly into the message board and I did not mean anything by this. I just came across this and thought it was neat.
Great site by the way. Yours sincerely,
Dave
jimh posted 09-23-2008 11:37 PM ET (US)
Hi Dave--Just kidding. But check out Crouch's Calculator--it's unique.
dg22 posted 09-24-2008 09:57 AM ET (US)
I checked out Crouch's calculator and i find it calculates a little high for boat speed but yes it's unique. Mind you that is for lighter boats that I was calculating.
Dave

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Author	Topic: Prop Calculator
dg22	posted 09-23-2008 04:14 PM ET (US) I found this on the web at: http://www.rbbi.com/folders/prop/propcalc.htm. You might find it useful. [Explains how to use the calculator] For my boat a 13-foot Boston Whaler with a 50 hp Evinrude [many detail of data entry deleted] it is quite accurate at 37-MPH. I have no idea how accurate this is so don’t take it too seriously. Dave
jimh	posted 09-23-2008 04:52 PM ET (US) Perhaps you are not aware of the PROPELLER CALCULATOR tool here on CONTINUOUSWAVE: http://continuouswave.com/cgi-bin/propcalc.pl It does the same thing but you don't need your browser to perform a lot of work. The calculator handles everything. This eliminates unanticpated results when the browser does not handle the JAVA-Script features needed to make the RBBI calculator work properly. There is no question of "accuracy" as the relationships are explicitly given for our calculator and the process is explained in detail. You should also investigate the many other resource of CONTINUOUSWAVE, beginning at http://continuouswave.com This discussion area is just a segment of what is available. Also, feel free to visit RBBI and post an announcement regarding the resources here.
fishgutz	posted 09-23-2008 05:47 PM ET (US) The Continuous Wave prop calculator is on the RBBI website.
jimh	posted 09-23-2008 08:26 PM ET (US) The underlying algebra of all propeller calculators is well-known and fixed by the Physics of the elements involved. Mercury has a slide rule that incorporates the relationships. They sold it years ago, long before the web and browser. I think it is still available. The recirculating design of the RBBI propeller calculator with its five inputs was actually adapted from a financial calculator popular for figuring mortgage interest and payment schedules that was published on the web. As I recall the RBBI page used to mention that. The Propeller Calculator at CONTINUOUSWAVE was written in modular Perl code which executes on the server, not the browser. It also makes extensive use of cascading style sheets to implement many cool features regarding use of tables in presentation. It is an unbelieveably cool collaboration between me (the alegebra and the presentation HTML code) and my son (the HTML form inputs and the modular Perl code). The Propeller Calculator formed the basis for the totally unique Crouch's Calculator, which was implemented in a similar manner.
jimh	posted 09-23-2008 09:04 PM ET (US) By the way, just in case you have not figured this out, I consider it the height of cheekiness to post a notice here on CONTINUOUSWAVE about a propeller calculator on some other website. HELLO?
dg22	posted 09-23-2008 09:44 PM ET (US) Sorry Jim. I was not aware that you had a prop calculator on this site. I will check out the other resources that you have on this site. I come directly into the message board and I did not mean anything by this. I just came across this and thought it was neat. Great site by the way. Yours sincerely, Dave
jimh	posted 09-23-2008 11:37 PM ET (US) Hi Dave--Just kidding. But check out Crouch's Calculator--it's unique.
dg22	posted 09-24-2008 09:57 AM ET (US) I checked out Crouch's calculator and i find it calculates a little high for boat speed but yes it's unique. Mind you that is for lighter boats that I was calculating. Dave