Did you try 16 degrees for 10 act cycles?
Actually, you can accomplish it in whatever number of act cycles you wish. The following format shows this:
The 'counter/numberOfCyclesToComplete' is the percentage of '160' whose angle is to be taken on at any one time.
counter++;
if (counter <= numberOfCyclesToComplete)
{
setRotation(initialRotation+160*counter/numberOfCyclesToComplete);
}