38 



BULLETIisr 440, tJ. S. DEPAETMENT OP AGRICULTUBE. 



A chute with heavy grading and a small amount of trestle work costs 

 about $1,500 or $1,600 per mile, A chute with one large trestle or 

 three or four moderate trestles costs about $1,800 per mile. A com- 

 bination of large trestles and heavy grading may make a chute cost 

 from $2,000 to $2,200 per mile. The average allowance for the cost 

 of chutes for good-sized logging chances should be from $1,300 to 

 $1,400 per mile for good conditions; from $1,500 to $1,600 for fair 

 conditions; and $1,800 for very difficult conditions. Chute landings 

 cost from $50 to $100 each. 



Equipment. — The donkey engines used for chute hauling are com- 

 monly larger than those used for yarding. They are of the wide- 

 drummed type usually described as roaders. The size varies with the 

 difficulty and length of the haul. For short downhill pulls a 10 by 12 

 inch engine may be satisfactory. On the other hand, for steep uphill 

 pulls or very long hauls a 12 by 14 inch or even a 14 by 14 inch 

 roader may be used. 



The f . o. b. factory cost of representative reading engines is approxi- 

 mately from $2,650 to $5,450. 



Table 6. — Factory cost of representative roading engines. 



Size. 



Weight. 



Cost. 



Paclies. 



Pounds. 





12 by 14 



46, 000 



S4,650 



14 by 14 



58,000 



5,450 



11 by 14 



36,300 



3,450 



12 by 12 



36, 500 



3,500 



13 by 14 



45,200 



4,350 



10 by 12 



27,000 



2,650 



11 by 13 



38, 000 



3,650 



12 by 12 



40,000 



3,800 





Main line. 



Back line, 



Size. 



li-lnch 



f-ineh 





cable. 



cable. 



Inches. 



Feet. 



Feet. 



11 by 13 



4,080 



10,600 



12 by 12 



4,070 



9,850 



12 by 14 



6,100 



13,850 



14 by 14 



8,100 



21, 400 



The prices of smaller machines and the approximate cost of placing 

 the engines on the ground are given under the discussion of donkey 

 yarding equipment. 



The size of the cable used for chute hauling depends upon the 

 severity of the haul. For light downhill pulls 1-inch or l|-inch 

 main line may be used. The standard size for long and uphill hauls 

 is 1^-inch main line, and the usual back line is f -inch. The cost is 

 given under donkey yarding equipment. The cable capacity of rep- 

 resentative roaders is shown in Table 6. 



On the main line of a chute ground rollers are placed at intervals, 

 and corrugated rollers, mounted onso-called dead-men, are required 



