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2014-12-19-754small.jpg2014-12-19-752small.jpgProject has been brought back from the dead. I went over the water test in my head many times. The boat was way bow heavy with the ESC way up front. That ESC went into another boat, and I needed one with a low profile, so I used a Proboat 45amp I had in my parts bin. That went aft of mid-ship. Motor stayed the same, but prop is an x432 which I will shave down to about 29 or 30mm to better match the high rpm of the motor. I used the original rudder moved off to the starboard side but added a strut with a fin. I think it just might work this time with the balance better to keep it from diving, extra fin on the strut to help keep it from spinning out, and a real strut to allow for lowering the prop shaft. We have had some very mild weather up here in Green Bay, WI, so I just might get this thing water tested by newyears if I get my RC rescue/retrieval boat updated to version 2. That's a subject for another thread.
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Quick update: cg issues resolved with new esc location. Boat planes easily and turns OK. Did a very short run in the Fox river after Christmas. I punched the throttle close to the dock and the boat instantly rolled over. Will experiment with smaller diameter props and adding turn fins, and flattening out the badly cupped right sponson, which I think is creating drag and making it roll over starboard at speed.Comment
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Update from 4-12-15 water trials
I managed to get the boats out on the water last Sunday. The weather was not ideal, it was about 55 degrees with gusty 15-25mph winds that kept blowing my equipment off the pier toward the water. There was shore ice to contend with, and my 2 sons were at least as interested in playing '5 Nights at Freddie' on their tablets as helping me keep the equipment dockside.
I made only 2 changes to the boat from my last update. I went with a smaller diameter prop to reduce the tendency to roll, and went to a 2S battery down from 3S. I made about 5 or 6 150 yard passes before the motor coupler came loose and I had to idle it in.
The boat performed almost flawlessly. It planed off instantly, did not want to spin out, did not submarine, and did not roll or even lift one sponson. The turning radius was wide due to too thin of piano wire between the servo in the bow and the rudder. The wire would just tend to flex, rather than turn the rudder much. I didn't give it full throttle due to the fact that I had no human carrying rescue boat, and my rc rescue boat is still in early testing stage. But it did cruise nicely at what appeared to be about 20mph with no issues. I don't think I can fit my gps logger under the canopy, so I will probably have to rig some sort of external capsule for it. Once I shake the bugs out on 2S I will go to 3S and see what it will do. I don't know if it will still qualify as a mini anymore, since the distance from the bow to tip of prop nut is now 20.75inches! I will post a video after I figure out how to edit it down a bit.
Once I have it tuned in, I will be happy to post all the specs if there is any interest out there.Comment
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May 17 water test with videos
Well, a month has gone by since the first water test of version 3. Lets call this v3.1. 430 brass prop, 2s batteries, 1st run was 2/3 of a 3s that had a puffed cell that I removed, next run was with a Nano-tech 2s 1000mah. Going to saddle 2 of the Nano-techs next time. After running on Sunday I found they would slide down into the sponsons and I could parallel 2 if I wanted. No room for a gps, and I have not rigged up an external capsule for mine yet, so no speed results, just the video shot by my son CJ, the owner of the boat.
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