Hello..Friends...from seeing all photographs by experienced modelers, and taking all advices from many great model makers , now i can understand that , all my models are too weak in performance..so from now i must need to make a good model, must be long to a 3 feet, looks good, and my main intention is ..that...it must run at least for an hour, without any troble...because i am living by a river, a calm, clean one...i have ample of spaces to drive my crafts...so how can i choose all aspects to full fill my dream...? i am not expecting a high speed to my craft, but it must run camly, but with a good speed to a long time...will any of respected members give an idea about this...?..please its a request....