the oil spill removal operation is not interrupted due to a shortage 

 of fuel aboard the UTB, it is recommended that the UTB carry three, 

 6-gal fuel tanks . 



As a precautionary measure, the outboard engines should never be 

 run at maximum throttle since the useful life of the engine is 

 drastically reduced at the maximum throttle. One of the UTB engines 

 burned out just prior to the end of the test program. 



Deployment: The UTB was deployed by a crane. A line was attached to 

 the pad eyes near the bow and the transom. No special precautions were 

 taken, and the complete deployment of the boat was completed in 2 .5 

 minutes in good weather (no winds or waves) . Four men were required to 

 complete deployment: one crane operator, one man on the pier to watch the 

 boat, and two men on the camel log to protect the boat from hitting the 

 pilings and to secure the boat after deployment. The crane was in position 

 on the pier prior to start of the measurement. 



Retrieval: The retrieval was also carried out with a crane, and the 

 total time required to connect lines to the UTB, lift the UTB out of 

 water and place it on the pier, and remove the lines took 3 minutes . 

 Four men were required to complete retrieval: two men from the UTB 

 positioned on the camel log to protect the UTB from hitting the pilings, 

 one man on the pier to guide the UTB, and one crane operator. 



Straight line tow: The 900-ft mixed boom was towed in a straight line 

 by tying the towing line to the samson post through the fairlead 

 installed on the load-carrying members of the samson post. During 

 towing, the line kept rubbing against the fairlead and soon began to 

 wear off. To extend the useful life of the tow line, it is recommended 

 that the fairlead, if used, should have a roller in it. Alternatively, the 

 contact point on the line at the fairlead/guardrail should be changed 

 frequently to maintain uniform wear on the line. 



The boom was towed approximately 50 ft behind the boat ' s transom 

 under test conditions of negligible winds, currents, and waves. With three 

 men in the UTB, weighing approximately 500 lbs, and maximum throttle on 

 the engine, a distance of one nautical mile was completed in 16.04 minutes 

 travelling north and in 15.85 minutes travelling south. The average 

 speed of the boat was therefore approximately 3.76 knots. 



One observation made during paying from and pulling the line into 

 the UTB was that if a reel were attached to the samson post to store 

 the tow line, the risk of entanglement would be minimized. 



Catenary tow; The towing capacity of two UTBs was determined by towing 

 the 900-ft boom in a catenary with an opening of approximately 65 

 percent. The first attempt was made under 10-knot winds. During towing 

 from the samson post, with engines at full throttle, the transom was 

 noticed to submerge enough to cause flooding of the UTB. The test was 

 discontinued and deferred for more favorable weather. Also, it was 



10 



