Propeller design

[afrhydro]

rick
if i could figure out how to use the info you posted i would have a lot more info to go on

[Jimboat]

afrhydro - Scott, i have emailed to you a copy of all 3 articles relating to the lift/drag/dynamic balance of hulls. Lift/Drags based on the principle of the Savitsky planing model. Dynamic balance outlined in the 3rd article. Call if you want to discuss more. This analysis is part of what the TBDP software does.

[afrhydro]

cool
going by the seat of paints so to speak for changes now
seems very tricky
i like the idea of making the after plane a small shallow tunnel hull slots
it would seem to be the simplest solution to more speed and fuel consumption
got to decrease hydro drag by half or close

[afrhydro]

jim or rick
look at this for me
you will see the two little wedges in the photo
those are gone
now my question is to get more lift
should i recess a 6 " x 1 1/2 x 8' tunnel slot up to the back of the sponsons or
go the other way and make a shoe

[afrhydro]

jim as soon as i get my printer working ill fill out that form and fax it to you

[oceanmaster66]

Jimboat,

Do you know of any publication or research paper that describes an analytical method for finding the Dynamic C of G of a monohull?

Thanks

[Jimboat]

oceanmaster66 - the paper that i wrote on dynamic CofG was aimed at power catamarans & tunnel hull designs, but the methods are the same for monohulls. The key is to do the analysis throughout the velocity range, so that any dramatic changes in the DCofG are identified (such as the typical "Hump Zone" that higher speed planing hulls experience).

Here's an article that I wrote that touches on methods for considering dynamic center of gravity (center of dynamic balance) for typical power catamarans.

Drop me a line if you have any questions.