New profile and a hydrodynamic fact

Been out on the bikes today.
Since yesterday was a write off with the wet and wild weather (we thought of doing a triathlon - swim, bike, run but found out pushing the bikes in driving rain didn't actually count as all three) we headed off to Millport (actually Cumbrae but no one uses the islands name, just the town)  late this morning.
It actually stayed dry apart from a few spits of rain as we arrived in Largs for the boat.
Once on the island we started what was planned to be 3 laps of the island.
Normally this is a fairly easy cycle with the following profile:

The profile looks impressive until you clock the Y axis and see that there is very little climb at all. In fact the only noticeable 'hill' is as you come into Millport itself where it gets a little bit steep. On the profile that's the incline at just about 9.0 on the drawing above. The other 'climbs' aren't even noticeable. This has a lot to do with the geography of the island. The road lies on the edge of the beach. On the western shore, the road lies on a raised beach, with cliffs just inland.
Since we were late starting out it was already lunch time by the time we got started. Naturally that meant stopping for lunch.
Suitable refreshed, we decided to change our normal route and go through the middle of the island, over the hill.
This meant instead of turning right after the 'climb' mentioned above, we would go left up into the island in a big loop, coming back onto our regular route just after the 9.67 mark above, adding about 5km to our lap.
The profile for this was:

As you can see, now our profile goes from 0 to 120m instead of 0 to 20m. A lot tougher. Also, on this new route, the 16km marker corresponds with the 11km marker on the original lap
But the view was worth it.

From our vantage point you could see (once the black dots faded) Little Cumbrae and Bute, with Arran and the Mull of Kintyre behind. Furthest out is Ailsa Craig.
The descent was quite exciting. Millport is great for cycling and walking as the low population means there are few cars on the road. Of course you need to be careful of walkers and animals. Luckily we met none but did miss the standing stones as we passed at around 30mph.
Tired but pleased but only having done 21km we did another lap, but the easy flat one this time. Sadly we couldn't manage the third.
Back on the 17.30 ferry. As we sailed back into Largs the weather which was alright all day started to get better and better. By the time the bikes were back on the car and the fish and chips eaten the evening turned into a beautiful one.

One of the things Fiona gets annoyed about when we cycle is the fact that I can roll as fast as she can cycle at times. When we get a descent I can keep rolling long after she has to pedal to catch and keep up with me.
I think I have finally understood why. My 'bulbous bow' modifies the way the air flows around me, reducing the drag I experience, similar to a large ship. In a ship in water there is a significant performance improvement on ships with the bulbous bow over those with out. Of course, I have to haul this up hills so it should all balance out.