# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A hole in the airframe of an HPR model to relieve the difference in pressure between the inside of the model and the atmosphere, so as not to prematurely eject the nose section.
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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