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I can think of no reason at all to wet an aircraft before take-off. If anything, this would degrade performance by adding weight, possibly also degrading the aerofoil efficiency (especially for laminar-flow aerofoils such as on high performance gliders) and possibly reducing cockpit visibility - try driving your car in the rain without wipers.
A possible explanation for someone who sees a liquid being sprayed onto an aircraft's flying surfaces (wings, tail-fin(s), rudder, flaps, tail-plane etc) might be that de-icer (Glycol or similar) is being used to removed accumulated ice. The removal of ice (which could badly spoil your day if you try to take off with too much on your aeroplane) is essential; the very slight performance reduction due to the remaining thin layer of de-icer is a small price to pay.
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Where do planes land and takeoff?
In an airport...
Do more planes crash on takeoff or landing?
Landing
How many planes takeoff each day?
Is The Plane Takeoff Cause I Want To Go To Mexico!
How high are planes 2 minutes after takeoff?
Depends on the type of plane you are talking about.
When is the acceleration of a planes takeoff the greatest?
i guess when the engines are set to full thrust, and when the plane leaves the ground...
Why planes doesnt takeoff at 12PM and why?
Noise regulations in many areas prevent aircraft taking off after midnight.
Why does the sky appear to move?
The sky does not move and you must be complete looney.
What are planes that take off from water in Anchorage's Campbell Lake called?
A plane that takes off from Anchorage's Campbell Lake are called floatplanes. planes that takeoff and land on water are called floatplanes. these planes have floats on the bottom allowing them to float in the water
Do magpie run before takeoff?
Sometimes, yes, but if they are sat on a tree or on a fence post, they do not :)
How many engines in one airplane?
You have to have at least one. (If you don't have an engine, your are classified as a glider.) The largest planes typically run 4 or 6 jet engines. Most planes have 1,2,3,4 or 6 engines. Very large aircraft sometimes have more. There are propeller planes, turbo prop and jet engines. There are also VTOL Vertical TakeOff and Landing planes, such as the Harrier and Osprey
How many planes did the wright brothers make before they became successful?
they made 4 planes before they became successful
What does hold short of runway on take off mean?
You might get receive an order to "Hold short of runway" before takeoff, but not during takeoff. That just means that the tower wants you to remain on the taxiway because another aircraft is taking off or landing and hasn't yet cleared the runway. Once you're "cleared for takeoff" you can taxi onto the runway and takeoff
