%%                                Input
%SUB3-4515

%P=T1*w1        %Power is produced by torque multiplied by rpm.

P=.40           %hp of an average cyclist

w1=60           %input rpm of an average cyclist

F=420*.2248     %Change the force from newtons to pounds x by 0.2248.
                %According to NASA article, the angles chosen 
                %were 15-19 degress(3)from the seat to the thigh 
                %and an angle of 110 degrees, as the maximum chosen angle 
                %at the knee was the 
                %maximum angle chosen at the knee.
                %500 Newtons will be the maximum force througout the
                %pedaling cycle as shown on the graph from Nasa so the
                %design will be based on this critical value.
                %At these angles the maximum force is 500 newtons on the
                %pedal.USe this maximum force to analyze the stress on the
                %crank shaft in case the shaft for the pedal becomes
                %locked.
                %ritical situation when the propeller gets stuck in the
                %sand and you still push on the pedal, don't want the pedal
                %to snap.
                
                
%%              Pedal crankshaft length (ft)


%P=T1*w1       %equation for power.

T1=5252*(P/w1) %torque is in lb ft
T1Nm=T1*1.35582

%T1=F*d        %torque produced at the pedals 


d=T1/F   %distance from center of rotation to the pedal is .4673 feet 
         %with angular velocity at 40 rev/min and an applied torque
         %(T1)of 52.52 lb ft.
 
         
         
 %%                      Pedal Crankshaft length  (m)      
   
         
          
 F2=420 %Newtons
 
 d2=T1Nm/F2 %Distance from center of rotation to the pedal is .1130 m.
               

 
 
 
 
 
 
 %%           Finding the bevel gear ratios, diametral pitch, torque and rpm
                                  
                                   %% first Bevel gear
N2=45;         %number of teeth
PD2=5.31;      %pitch dia in inches
DP2=N2/PD2     %diametral pitch

                                   %% second bevel gear
N1=15;       %number of teeth
PD1=1.77;    %pitch diameter in inches
DP1=N1/PD1   %diametral pitch




%%                       Torque and rpm for the vertical shaft
G1N=N2/N1
G1=PD2/PD1          %Gear ratio for first gear set
w2=G1N*w1           %rpm for the vertical stainless steel shaft
T2=(w1/w2)*T1       %Torque for the vertical stainless steel shaft.
T2Nm=T2*1.35582     %Torque (Nm)







%%               third bevel gear

N3=45;       %number of teeth for third bevel gear.
PD3=5.31;    %pitch diameter in inches for third bevel gear.
DP3=N3/PD3   %Diametral pitch for the third bevel gear.

%%                 Fourth bevel gear 

N4=15;      %number of teeth for third bevel gear.
PD4=1.77;   %pitch diameter in inches for third bevel gear.
DP4=N4/PD4  %Diametral pitch for fourth bevel gear.




%%              RPM and torque for the Propeller Shaft

G2N=N3/N4
G2=PD3/PD4         %Gear ratio for the second bevel gear set.
w3=G2N*w2          %Output rpm for the propeller shaft
T3=T2*(w2/w3)      %Output torque for the propeller shaft

T3Nm=T3*1.35582    %From lb ft to Nm.