in a Cessna 152, you either flick/snap the aeroplane in
Whoa there!
Whomever is being quoted should be much more cautious than to say this! If the 152 involved here is an Aerobat version, and an areobatic instructor is aboard this is acceptable. Otherwise, most certainly not! What is described here is a snap roll, and introduces all kinds of structural loads which a "normal" category aircraft is not designed to withstand. This
is how a fool breaks a plane!
If in doubt, read the instructions! The Flight Manuals for spin approved Cessnas describe how to enter a spin why not do it that way?
Generally, the phrase "slow deceleration" is included in the description of spin entries. There are all kinds of other warnings about not having higher speeds and abrupt control inputs.
As for recovery, do what the flight manual says. If you are flying an aircraft which does not have a spin recovery described in the flight manual, you really should not be spinning it, unless a number of special precautions and authority has been granted.
The let go of everything method is not the quickest way out of any spin, but with altitude available, and a later prompt recognition and recovery from a spiral dive, it will be adequately safe on a small certified GA aircraft. The key being, when letting go of everything, you're not making it worse. That said, if you have inadvertently spun any plane, you were probably maneuvering close to the ground, and you're all done then. Aside from buggered up aerobatics or instrument flight, I cannot imagine how an accidental spin would occur at altitude.
The "let go of everything" method does not work on all aircraft
Very true. This is why nearly all aircraft are prohibited intentional spinning!
The Caravan recovered at Vne AND 2.8G, descending at 9200 FPM. Hopefully that warns most pilots away from casually attempting such things. I highly recommend competent spin training (including reading the flight manual!), in an approved aircraft type, and not spinning anything else!
Here's the video clip of my Caravan spin for those who have not seen it linked here before....