Help me in using loop "For and if"

Hi, every one.

I have a problem of simulating the operation of a ship, in which I have used loops "For and if" for solving. I wrote in matlab and obtained results but Result is not correct. I think i did mistake with these loop. Please fix me the following code. In the picture show the scheme of this model. Many thanks

clear all;
clc;
R=300;
v=11;
zt=33;
P=77;
Q=0;
Q2=0;
q=4;
hpr=2;
hw=[1.5 1.8 2.2 2.3 2 2.3 2.4 2.5 2.7 3 1.8 1.5 1.5 1.8 2.2 2.3 2.1 2.3 2.4 2.5 2.7 3 1.8 1.5 1.5 1.8 2.2 2.3 2.1 2.3 2.4 2.5 2.7 3 1.8 1.5...
    1.5 1.8 2.2 2.3 2.1 2.3 2.4 2.5 2.7 3 1.8 1.5 1.5 1.8 2.2 2.3 2.1 2.3 2.4 2.5 2.7 3 1.8 1];
t=0;
tper=R*1.6/(v*1.82)*1.1/24
tst=2;
for i=1:60
    if hw(i)<hpr
        t2=0
         Q=q+Q
        z=(i+tper)*2
    else
        t2=tst
        Q=q+Q
        z=(i+tper)*2
        if (z/zt<1.1) || Q>P
           t=i+tper+tper+t2
            if t>30
            Q1=Q
            break;
            end
        end
        end
end