bbdave,,firstly you say you want to run your boat in the estuaries,,, check with the local river authority for complience rules and regulations,,there is usualy a 6 mph speed limit on most rivers and estuaries,( would you want to sit around for a couple of hours watching your boat chug along at that speed ? I think not ..most important of all health and safety (quoted many times on this forum) coupled with insurance,hard to find for your usage what with all the rules and by-laws..so please be careful in what you do, and dont take what others say and do without CHECKING FIRST... Zenoah 25.4 std Apache 57" Futaba 6EX 2.4 Prather 270 prop good combo good luck