Indeed some models are acrobatic category, but most are utility .. quite a different story. The TCDS suggests that inverted flight is prohibited ... the carb question is, therefore, not relevant ... .. .According to the TCDS the acrobatic models appear to be OK for -3g clean ?. .. .To balance Cirrus Driver's comment about recovery, it is essential to follow the recovery prescribed for the specific aircraft. In the case of the 150, the TCDS suggests .. Spin Recovery: opposite rudder - forward elevator - neutralize controls. . . . <small>[ 30 March 2002, 10:32: Message edited by: john_tullamarine ]</small>