Hello Group, Some thoughts about big engines...
Someone may be able to answer this question..... Just how fast can the coupe go without falling apart ?? The Never Exceed Speed is 144 mph.... and coupes without aeliron weights, (and excess play in the control system), may develop aeliron flutter at a much lower airspeed - and come apart..... So, I think I am right that the 0-200 STC limits the engine output so that these speeds cannot be attained - by limiting the prop that can be legally used..... Now we try to evaluate the 120 HP Franklin engine STC.....More power, more speed .... Will it be limited to safe airspeeds by the approval of proper props??? Well, I can see benefits from better climb rates, etc., but do think this may lead to folks using higher airspeeds --approaching the critical limit (s), and airframe failures. Now, I know that all pilots will observe the critical limits of their particular airplane, (Ercoupe or other type) and never exceed them..... so all will be OK.. Yeah! Yes, I have thought of alternative engines for the coupe, and find that a properly operating Continental 75/85/90 does just fine. An 0-200 might be an excellent alternative on rebuild as long as you observe the prop choice and airspeed limits.... Fred Weick spoke about trying a 125 hp Lycoming with a particular prop they were testing ---getting excellent higher airspeeds..... ( but, I am sure using the aelrion weights in place to prevent flutter)......"---it did about 150 mph with that Propeller-engine combination----"(pg 181,The Ercoupe, A touch of Class" - quoted from International Ercoupe Association Newsletter, September - October, 1974.) So, who knows, the Coupe may stay together, with no problem; and as long as the extra power is controlled for better climb rates, all should be OK. Guess, I will stay happy with the original engine. Now, when I need to overhaul..... who knows. Fly Safe - Have Fun Carefully! Harry 93530 Blacksburg, Va.
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