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Somewhere over England - Tiny White Speck High in the Sky ???
Looked up into the sky today, I can't remember what time, but well after I had got out of bed. I could see a plane high in the sky, a tiny little speck. Well that got me thinking, maybe the pilot would be a PPRuNe reader and would remember going over my house, maybe even saw me and my little lad looking up. So if you flew over England today, really, really high, and quite fast, could you let us know what you were up to please ?
It could have been me, didn't see you or the lad though cos I never look down. Scared of heights you know. Can't tell you where I was going (secret and all that). Well OK - not a secret really, in all honesty I got lost and today I don't remember what I planned yesterday. I hope I didn't look like a tiny speck, I was hoping I looked suave and dashing I'll be there again on Monday at about 1000Z or 1100 Local and promise to look down on the left side, will let you know if I see you. I may have the dark visor down but will definately be wearing the green gloves
I don't own this space under my name. I should have leased it while I still could
Join Date: Dec 2002
Projectiles in a vaccuum is easy.
The vertical velocity at the apogee is zero. The maximum distance is achieved with a 45 degree launch angle. The horizontal speed component and time determine distance. Flight time is twice the time for the initial vertical velocity to reach zero.
v=u+ft s=ut+(ft^2)/2 v^2-u^2=2fs
where u is initial velocity v is final velocity t is time s is distance and f is accelaration
vertical velocity is total initial velocity X Sine of the launch angle. horizontal velocity ditto except it is Cosine of the launch angle.
PS ladders up a wall use the same sine/cosine rules.
Sine = opposite/hypotenuse (ladder length) Cosine = adjacent (distance of foot from wall)/hypotenuse
I think it might have been a terrible waste of fuel and do we really need tiny white specks anyway? I mean, we're trying to cut back aren't we? Do we really need such showing-off at the tax payers expense, who were we hoping to recruit with such a display anyway?
Couldn't have been me, I am on leave and have a 5-day beard so my Oxy mask won't fit. etc
Location: Quite near 'An aerodrome somewhere in England'
The other 2 are:
s = ((u+v)/2) x t s = vt - (ft^2)/2
Which allows you to obtain the solution from any 4 of the terms s, u, v, f and t.
Good old O-level Add. Maths - always knew it would come in handy!
I suppose that slouching digi-yoof of today doesn't bother with such things as they would undoubtedly 'do is ed in' - and probably also thinks that Calculus is some Greek island where 'me n me m8s' go to get wasted...