Here is the data we got from Rainer DJ9BV for the BVO-3wl
 
 10 elements,meters,Dipole 8mm , 4mm elements,                            different boom diameter
   half element lenght in free space  full lenght in free space 15mm 20mm 25mm 30mm  
0.000  0.506  1012.0  1013.5  1014 1015 1017  
0.391  0.485  970.0 970.0 970.0 970.0 970.0  
0.669  0.4785  957.0 958.5 959 960 962  
1.244  0.468  936.0 937.5 938 939 941  
2.000  0.4595  919 920.5 921 922 924  
2.847  0.454  908 909.5 910 911 913  
3.734  0.451  902 903.5 904 905 907  
4.625  0.4495  899 900.5 901 902 904  
5.503  0.4475 895 896.5 897 898 900  
6.264  0.455  910 911.5 912 913 915  

the vertical plane is placed 51.9 CM in front of the horizontal plane

the total lenght of the yagi is 6.85M