kc7til

My Feedback: (10)

I built the Dumas Dauntless but wanted a simple single motor,propeller rudder system. With the new water cooled brushless outrunners now available, why mess with double everything? The motor is a Turnigy Aqua Star 3720-1500kw with a 50A water cooled ESC using 2 5000 mah 7.4v lipoly packs. I added 4 lbs of lead ballast just for stability in the center near the keel. The prop is a 42 mm two bladed high speed screw on a 4mm solid shaft. I fabricated the rudder from some 1/8" copper plate I had laying around. The boat is plenty fast and runs at a very realistic scale speed. I did have to double the keel where the prop shaft and rudder are mounted but are much stronger than the kit plan. If you want it to go faster, just go to 3 cell or 4 cell packs as the motor is capable of handling up to 15v for 890 watts of power but I wanted a scale speed and longer run times. I added an image of the boat with most of the detail work on it on a very windy day on a big lake. The hull handles the rough water very nicely.

All Day Dan

My Feedback: (5)

kc, nice set up. What kind of run times are you getting. Can those ESCs be programmed for reverse? How is it done? Dan.

kc7til

My Feedback: (10)

Yes, the ESC is programmable with reverse. I have not yet run the batteries down yet but estimate 30-40 minutes depending on throttle settings. Of course, going to a 3 or 4 cell pack will give much more power and speed but you really don't need it. My idea was to give it a realistic scale speed, not crazy fast. I am working on a good video of the boat running along with all the finishing touches, IE spray bars, gunnels, hardware, windows ECT that were not installed when the image was taken. I did not build this boat as a scale model of the original Dauntless but something I would have had. By the way, the kit instructions are virtually non existant and the wood was terrible. Nice subject, lousy instructions and wood.

All Day Dan

My Feedback: (5)

Good information. Thank you for the reply. I'll be looking forward to seeing the video. Dan.

Hydro Junkie

kc7til, have you read through the other Dauntless thread? There is a lot of good info about set ups, detailing and lots of other worth while information and pictures. As far as the Dumas kit, poor wood and instructions is par for the course. I've never had a Dumas kit with wood that was really that good. I've built three Dumas hydroplanes, two more waiting in the wings, and all had/have poor instructions. IF I were to build one, I'd relegate the mahogany framing to template use and build out of good quality birch plywood rather than struggle through with the cheap door skin.

kc7til

My Feedback: (10)

Yup, I agree. No, I have not read any threads on the Dauntless kit yet, but will, thanks for the tip. I really enjoy the design of the kit, but wish the instructions were there and better wood. The boat itself is a joy to run on the water. Will post some more images later of the finished boat and maybe a short video if I can figure out how to do it.

Hydro Junkie

If you haven't seen the other thread(all 100+ pages of it) here's the link:
http://www.rcuniverse.com/forum/rc-s...dauntless.html

kc7til

My Feedback: (10)

Thanks. I did run the boat for 45 minutes yesterday under various throttle setting and used about 60% of the battery capacity ( two 5000 Mah 2C 7.4 V LiPoly's). I estimate the speed at 20 MPH actual which would be about 60 MPH scale or very close to the full size vessel at 50 knots.

gdlouhy2

I hope to duplicate your setup. Seems that motor is no longer available or the esc. I am hoping to find something close to it.

I finally found the same (I think) motor, esc combo on Aliexpress.

gdlouhy2

I hope to duplicate your setup. Seems that motor is no longer available or the esc. I am hoping to find something close to it.

I think i found your motor and esc here: http://www.aliexpress.com/item/32953...27424c4d0Lv0KV. I added the pump.