Arm the Floats is correct about the 300 in auto hovers and auto landings. If you want to practice autorotative landings and you feel this is important to your overall flight skills development, then the 300 is the only way to go, as the Robbie is very unforgiving in this area. The 300 gives you the opportunity to perfect this skill, while the R22 does not.
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Safe flying to you...