A question for those who have built and run a Lesro airboat - how do you get it to behave ??!!
I built my kit a little while ago and fitted a 900 kv brushless motor (
this one) together with a 10" 3 blade prop. I left out all the internal trays provided in the kit and made my own servo and battery mounts. It went very quickly but at full throttle was uncontrollable, and at much less throttle was difficult to steer (lack of airflow over the rudders I guess). Initially I made some larger rudders but that did not improve things. I changed down to a 9" 2 blade prop, but again it was virtually impossible to get to run straight and turn in a controlled way (small imputs don't have any effect, large ones cause it to spin quickly). Tried out on an empty lake, full throttle and no steering input results in the boat running continuous circles. Trying to straighten it up leads to worrying random manoeuvres! A fellow member has the same boat and his behaves in a similar fashion (although he has the same motor and a similar prop, so perhaps that's to be expected).
Anyone else found the same? I wonder if I need to ballast it down as it was originally designed for IC engine and a tank of fuel, although my 4000 mAh lipo probably weighs what the fuel would. Perhaps too much torque (although I would have thought an IC engine would produce something akin to my brushless motor)?
I had imagined that the tunnel hull would want to track in a straight line but it doesn't, at least not how I have built it. At the moment this is no fun to run (especially with other boats in the vicinity!) and I would rather like to sort it out. Any suggestions?