I agree that the Evinrude 18 would pair well with your Skipper. I regularly run an Evinrude 25 or our 12' Starcraft open fishing boat. I did make some structural "improvements" to boat to stiffen it up a bit but it does fine and is "big time fun to drive." I also have a Johnson 18 with a 10hp cowl that we've run on a local lake which has a 10HP motor limit
1957 FC Rocket -'58 Evinrude Lark 35
1958 FC Hawk 1-'59 Evinrude Lark 35 (and J-55)
1960 Starcraft 12' open boat-'76 Evinrude 25
1965 era McCorvey 3-point hydroplane-'52 Mercury KG-7H
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I believe a fellow Feathercrafter has an 18 hp Evinrude for sale. Jim Parnell is not on the site but he may still have the motor. It would be an excellent motor for your Skipper. If you are interested I can get in touch with him.