Sheppy
Well-Known Member
Very interesting thread but I would have thought the question "Can I afford the fuel to go?" would be more pertinent these days 
Let us know how you get on.....
Let us know how you get on.....
Ooh, out of my depth now, but i am sure a pilot will correct me:
True airspeed plus the wind speed is useful for "when will we get there", and will be your higher figure.
Indicated airspeed is read from the pitot tube, displayed on the primary "airspeed" gauge, and varies with altitude compared to the true airspeed. Stall /max speeds etc. for an aircraft don't vary much as altitude changes when expressed in indicated airspeed, so it's a useful figure for knowing if you are about to fall out of the sky or rip the wings off.
At sea level, indicated airspeed is approximately equal to true airspeed.
At 35,000ft, 250 knots indicated airspeed is something like 430 knots true airspeed!
Better explanation here:
http://tscm.com/mach-as.pdf
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Well - nobody else has mentioned it - but I'd look for flat water - which means the wind with the tide ... as the wind is predominately south westerlys that means a rising tide.
What has crossed the channel?
Over the years it has been crossed by numerous swimmers, DUKW's which are amphibious landing craft, various amphibious cars, jet ski's, rafts, concrete tanks, and all manner of oddball items.
or to put it another way 4.5 ribs have gone all the long way around uk