The Polar Airship 



223 



EXPERIENCE WITH ALL WINDS OF THE RETARDING PERIOD ASSUMED AS 

 DIRECTLY ADVERSE AND MOTORING PERIOD DIVIDED AS FOLLOWS: 



Drifting period, 











all winds 



Motoring period, 140 hours ; motor distati 



ce, 1,680 miles ; winds, 30 



hours favor" 



adverse, 





able, no hours unfavorable, at mean velocity. 





100 hours. 















Unfavorable, no hours. 



Favorable, 30 hours. 



Motor, 1,680 

 miles. 



Loss miles 



Mean miles per 

 hour. 



Miles. 



Total loss. 



Miles. 



Net loss. 



Net gain. 



O 2S5 



6-73 



715 



1,000 



195 



805 



875 



A 158 



6 25 



962 



850 



190 



660 



1,020 



B 112 



6.85 



753 



865 



205 



660 



1,020 



C 252 



6.00 



660 



910 



180 



73o 



95o 



D 142 



7-5o 



825 



965 



245 



720 



960 



E 742 



12.25 



1,350 



2,090 



365 



L725 



—45 



F 165 



4-5o 



495 



660 



135 



525 



i,i55 



G 100 



425 



470 



570 



130 



440 



1.240 



H 104 



5-75 



636 



740 



170 



57o 



1,110 



I 130 



790 



870 



1,000 



240 



760 



920 



J 648 



10.00 



1,100 



1,650 



300 



i,35o 



33o 



K 232 



5.00 



55o 



780 



150 



630 



1,050 



L 112 



4-75 



523 



635 



145 



49o 



1,190 



M 252 



7. 00 



770 



1,020 



210 



810 



870 



N 362 



6.25 



688 



1,050 



190 



860 



820 





Mean of tl 



le 14 10-day p 



eriods 





900 









EXPERIENCES WITH ALL DRIFTING WINDS ASSUMED DIRECTLY ADVERSE AND 

 VARIOUS PERCENTAGES OF FAVORABLE AND UNFAVOR- 

 ABLE IN THE MOTOR-PERIOD 



Taking the losses in the ioo-hour drift-period from the preceding tables and estimating higher 

 p^rcenta^ij of favorable winds in the 140-hour motor-period, we get results as follows : 



O 



A 



B 



C 



D 



E 



F 



G 



H 



I 



J 



K 



L 



M 



N 



Mean of 14 



AA. 



Favorable, 40 hours. 



Unfavorable, 100 hours. 



Net gain in 10 days. 



Mtles. 

 I,005 

 1,165 



1,155 

 1,170 

 I,o8o 

 2IO 

 1,245 

 1,325 

 1,230 



I,o75 

 430 

 1,125 

 I,28o 

 1,005 

 940 

 1,030 



BB. 



Favorable, 50 hours. 



Unfavorable, 90 hours. 



Net gain in 10 days. 



Miles. 



1,135 

 1,265 



L295 

 1,185 

 1,235 



450 

 1,335 

 1,410 

 i,34o 

 L425 



630 



1,245 

 1,365 

 1,150 

 1,065 

 1,170 



CC. 



Favorable, 70 hours. 



Unfavorable, 70 hours. 



Net gain in 10 days. 



Miles. 



1,395 



1,520 



L565 

 L430 

 L540 

 930 

 1,515 

 1,580 



1,575 

 L55o 

 1,030 

 i,45o 

 1.565 

 1,430 

 1,320 

 1,425 



