Really depends. Here's the data.
We go under canvas whenever possible, but as others have mentioned, it depends on many factors including wind, current, available sunlight, how long we've already been out & how much longer the kids/admiral can hold out until we make our next destination, etc.
Fun with numbers: The last two seasons since we acquired
Grasshopper, our H23.5, I've kept a consolidated log summary (I haven't done it for the prior 3 season on our previous boat).
In '07 we got a late start & had only 11 days on the water, most of them on Lake Champlain, where the slip required little motoring, and the balance was on LI Sound, which required greater motoring from where we launched. Here is the breakdown:
- Total NM: 173.7
- Total hours: 44:20
- Avg Dist/Day: 15.8
- Avg Speed: 3.9 Kts
- Dist Under Sail: 134.1 (77.2%)
- Time Under Sail: 34:00 (76.7%)
- Avg Speed: 3.9 Kts
- Dist Under Power: 39.6 (22.8%)
- Time Under Power: 11:35 (26.1%)
- Avg Speed: 3.4 Kts
I find it interesting my average speed was slower under power, but I guess we would slow down to take in the sails & as we approached the dock.
This season, I put out a mooring on LI Sound from July 4 to Labor Day. We had 18 days & did much more extended trips. We motored more for several reasons, including we would provision ourselves by motoring from the mooring to the public launch, which added about 40 minutes of motoring we might otherwise might not have done (that is, if we wanted to row back & forth to the mooring multiple times!). We also had long legs where we lost wind or when we needed to make a drawbridge or marina closing. I would have preferred more of a balance like the prior year, but it was pretty much 50/50. Here are the statistics:
- Total NM: 374.7
- Total hours: 91:05
- Avg Dist/Day: 20.8
- Avg Speed: 4.1 Kts
- Dist Under Sail: 188.6 (50.3%)
- Time Under Sail: 48:35 (53.3%)
- Avg Speed: 3.9 Kts
- Dist Under Power: 186.1 (49.7%)
- Time Under Power: 42:30 (46.7%)
- Avg Speed: 4.4 Kts
I see the speed under power was higher this season, which makes sense because we relied on the iron jenny to make time or when becalmed in several instances. I will also note that our 6hp regular shaft original equipment outboard is high on the list for replacement. A long shaft, 4-cycle, 8-9.9hp outboard is an upgrade we really hope to achieve for '09. Let me also note, for the record, we used 34.7 gals of fuel (less a gallon or so left in the tank).
I guess I should be embarrassed that in both seasons I can only average 3.9 kts under sail! We fought some wicked currents on the Sound & often held out as long as possible before giving up on the wind!
In any case, Hal, the numbers are what the numbers are; they don't lie. I leave them to you to draw your own conclusions to try to answer whatever the genesis is of your question!
Fair winds!