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There was an article about this in a U.S. model magazine way back in the 50s or 60s for winter indoor flying. They found that more that two "engines" resulted in a least one "engine" stops flying, letting the others do the work, therefore a twin "engine" was the most useful for parlor flying.
Funny, I just can't find confirmation of this from a reputable news source.Sometimes truth is funnier than fiction.
Trump's HHS terminated a $1.3 million grant to the Center for Innovative Public Health Research to study "Adapting an LGB+ inclusive teen-pregnancy prevention program for transgender boys."