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Experimental Aircraft designers specify guidelines for the size of the aircraft engines to be used. What happens if you use a larger (more HP) engine than is normally used? What effect does this have on flight characteristics? In this video, we show how 3 builders of the same homebuilt aircraft ( Zenith CH701) have installed larger engines and examine the results of their choice. (ULPower, Aeromomentum, Viking Aircraft).
More about engines for the STOL CH 701: http://www.zenithair.com/stolch701/7-engine.html