On Jun 1, 2:01*pm, Andy wrote:
On Jun 1, 9:52*am, John Cochrane
wrote:

That's a poor solution. A sticky knob that won't let you go below max
range would be better. If it shows Mc 0 but it's really set at (say)
Mc 2 because you're in a howling headwind, you need to know to cruise
at Mc 2 and not to take any 1.9 kt thermals. If the indicator shows Mc
0 you don't know that

Agree, but he seemed very sure that he had been told by his instrument
designer that MC zero would alway yield max range glide since the
computer knew the wind and would take account of it.

Maybe I should ask Dave directly since the SN10 was the instrument in
question.

Andy

Say what ???

No. No. No. No. (Did you hear me ?) NO.

When flying into a headwind:
Set MC 0 a note altitude surplus or deficit.
As you increase MC, the deficit will decrease,
reach a minimum, then increase again.

The SN10 takes into account the effect of
wind on each leg in future. That affects the
average speed per leg, the altitude required
per leg, and the surplus or deficit. All this is
calculated at whatever MC setting you input.

OK ?

See ya, Dave "YO electric"