I swim in an EndlessPool and use this method to get a handle on my efficiency. The flume rate when set to 100 yards in 1:40 (= 100 yards in 100 seconds or 1 yard per second) is the rate I use for simple math to determine DPS. I time how long it takes to complete 10 complete 2 arm cycles. Without much effort I can average 30 seconds for those 10 cycles or 3 seconds for both arms = 1.5 seconds for each arm. I figure the DPS would be 1.5 yards per single arm stroke. (Note: I swim using fins to take the complete load off these 72 year old shoulders). As I ramp up the current during my daily swim I try to maintain the same time for 10 strokes. Since I remain in place in the faster current I figure I must be going a further distance in the faster current.
Now the questions: Does anyone see any flaws in my logic or math? I try to maintain a constant position over a floor mounted mirror and look to see if I drift backward indicating over gliding and loss of momentum. To maintain the position as the current and my speed increases I need to fully extend, streamline and kick more. My hand feels anchored in the water with very little slippage. Am I correct to aim for the same stroke count as the flume speed increases to get a handle on increasing my distance per stroke as the current increases?