Comparison of Drag force in different orientation of bicyclist .

I have taken four types of geometry of some bicycles .

1. The Upright position which is frequently used , in which frontal area of 0.5 m² and a drag coefficient of 1.1 .

2. By crouching the frontal area of the bike-rider system is reduced to 0.36 m² and the drag coefficient also decreases to 0.88 (Racing) .

3.When two cyclists ride in a drafting configuration they behave rather like a single, longer streamline body. The frontal area remains at 0.36 m², but the drag coefficient drops to 0.50 (Drafting).

4.The final streamlined configuration has a frontal area of 0.46 m² but an even lower drag coefficient of 0.12 (Streamlined).

% CAMPARETION OF DRAGE FORCE IN DIFFERENT BICYCLE ARRANGEMENT


                                   % DATA  
rho = 1.225                        % Density in STP  kg/m3
A = [0.51  0.36 0.36 0.46]         % FRONTAL AREA in m^2
V = [1:50]                         % VELOCITY IN m/s
Cd = [1.1 0.88 0.5 0.12]           % DRAG COEFFEICIENT 
p = 0
 
 
A_Cd = (A.*Cd)                     % MULTIPLICATION OF MATRIX   
a_cd = A_Cd.'                      % TRANSPOSE


for i=a_cd(p+1)
                                         
                                    % CALCULATIVE FORMULA    
DRAG_FO = 0.5*rho.*V.^2             % DRAGE FORCE = 0.5*rho*A*Cd*V.^2 
DRAG_FORCE = DRAG_FO.*a_cd

                                    % PLOTING  
figure(1)                           % PLOTING V vs DRAGE_FORCE 
plot(V,DRAG_FORCE, 'linewidth',5);
xlabel('VELOCITY')
ylabel('DRAGE_FORCE') 


                                      
    end
    

For Upright position FOR RACING

FOR DRAFTING FOR STREAMLINED

Below is the comparision between each of the following which we saw above, I had taken the comparison of every arrangment which above mention aat particular velocity at 35 m/s.

where BLUE - Upright position

ORANGE - RACING

YELLOW - DRAFTING

VOILET - STREAMLINED

CONCLUSION : Streamlined bicycle have high speed due to advantage reduction in drag.