prop selection

[pavel915]

I use bp-delta diagram for selection of propeller.
But i want to make a program for selecting a propeller using bp-delta diagram. But as there are a lot of numerical data to handle there , it seems so hard to me to make a program using this diagram.
I want to know, is there any polynomial representaion of the data of Bp-delta available? so that i can do my programming easily.

Thanks in advance.

[quyetvtt46]

why don't you try to use KT-KQ-J diagram? it is easier Bp-denta. i have polynomial representaion of the data of KT-KQ-J. if you'd like, i will send to you and a programe what i wrote by using it.

[pavel915]

Yes; now i prefer kt-kq curves to select propeller.
I also have the polynomial representation of kt and kq. I followed the follwing paper in the link:

http://deepblue.lib.umich.edu/bitstream/2027.42/3557/5/bab2786.0001.001.pdf

[pavel915]

but I am not sure , wheather the polynomials are true for all conditions,

[quyetvtt46]

which conditions? Re? with z=3,4,5 it's reliable but z=2,6,7 it is not reliable. but it's acceptable. this's a programe what calculate Jopt,P/D...you can refer.

[pavel915]

The program is written in a language that i cant understand;

[quyetvtt46]

i changed it to english. you can give me your idea what i can refer to develop my programe. thanks!