D&D's Mean Machine Sport

[JMSCARD]

Hi i just built mean machine with same set up motor 15151y hydra 240 prop m445 4s on the second run about one min. in to run blew one of the cap wright out of the esc need help thanks Joe M

wow... thats odd... I run a 1515 1.5y with a hydra 120 on 6s all the time with a m445.... never any issues.... wierd, maybe your lipos caused it.... 4s with a 1y and hydra 240 should be a great setup???

[Fluid]

...motor 15151y hydra 240 prop m445 4s on the second run about one min. in to run blew one of the cap wright out of the esc...

IMO the 1515/1Y is not really suitable for the MM as a sport motor. It is a great hydro race motor, but if the MM does not run freely it will overload the motor and the ESC fails. If the boater keeps getting on and off the throttle, accelerating and decelerating cyclicly, the motor draws huge amps and builds up a lot of heat in the motor and ESC. Combine the two practices with a long run time and it would be no surprise that any ESC was smoked.

With a race motor like the 1515/1Y, the boater should limit his run time to 2-3 minutes maximum if he is running at a constant speed. If he is on and off the throttle all the time, 1-2 minutes may be better.

If the motor is drawing a lot of amps like the 1515/1Y can, the cells must be up to the draw. 'Ripple currents' are the drops in pack voltage during part throttle, high amp draw running, and they heat up the ESC caps fast. If the caps fail, the FETs are next. Race motors need high quality cells with a high mAh and high 'C' rating, or problems with the ESC can be expected.

IME better motors for 4S sport running of the MeanMachine are the Feigao 10XL for cheap cells, or the Neu 1515/1.5D for top quality cells. The former gives speeds in the mid-high 40s, the latter mid-high 50s. The latter will spin a big prop so have a good motor mount....


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[D&D]

I would have a hard time disagreeing with most thing that Fluid states. However, I will point out that when I talked to Castle on the phone they quoted to me that with the setup I have (1515 1Y, HV180, and 4S) that my batteries should proved a minimum of 8000Mah and have a good "C" rating. So far my Turnigy 4S2P setup at 5000Mah and 35-45C have done well with long run times and varying speeds (but, mostly flat out). I ran here in Indiana yesterday and ran the batterys all the way to the 12V shutoff point that I programmed into the controller. I recharged the batteries today and they seems to charge OK, I'll see when I run it next.

Yesterday I looked faster than H--- (like a half-inch of boat in the water and the bottom blade of the prop), but it only ran at 56mph - I think it was the different angle on the GPS satalite here in Indiana versus NC. I got my new Y537-3 prop yesterday and by this afternoon it was polished, balanced, and sharpened ready to go - at least 60mph right?

[ReddyWatts]

The Y537/3 calculates to be about 3 mph faster than the X440/3 using less amps. Good Luck!

[izzy7771]

D
it seems like i always struggle with gps signals in Indiana for me. a lot of time i run out of lake before i get accurate readings. but i only have a garmin geko. works great at only one place i run and thats where i go when i am concerned about how fast it really is. lol.
i think you are gonna break sixty pal. if you have to run in a river with the current. should get you the few mph you need. lol.
izzy

[JMSCARD]

Just goes to show how much I have to learn... I would have thought 4s with the 1515 1y would be fine? No wonder I spend so much money on esc's ... Lol... I popped a cap on my hydra 120 in my drifer last weekend and smoked a himodel 200 in my df 33 with a 1521.... I have alot to learn!!

[Joe M]

Have a buddy runs a ul1 15151y 240 hydra and a m445 prop and has no problem joe m

[D&D]

Hey, that river idea sounds good to me. I can to to the Tippecanoe river just outside of town and maybe I can get my 60mph. That still counts as 60, right? Now if only I can remember to run down stream and not up stream.....

[D&D]

I have now run the Y537-3 two times. The first time the boat did not handle well at all, terrible trim with that prop and it crashed. Second time the water was too rough, but minor changes to the strut and moving more weight (batteries) back over the prop settled the trim down - but again the water was too rough. For a setup like this the water must be like glass and the wind at "0" - still waiting.......

[D&D]

OK, back in NC on home water - no excuses, water much like glass and no wind.

Ran the D&D MM this morning with the strut flat with the bottom of the boat using a Y537-3 prop - Again, stuck at 57.5mph. Just can't seem to get away from that 57mph. The boat's attitude and ride was not an everyday run prop or setting. However, I will try raising the strut some and see how it will work with this prop.

I then ran the D&D with a new X440-4 (I had modified the old 440) and the boat looked lightening fast. However, that turned out to be due to the almost perfect attitude and ride of the boat. It actually ran 55.5mph. I would call it a great running sport MM and that is what I built this to be, but......

My wife shot some video (her first attempt) on my new Cannon Power Shot still camera which will take 720P video and I will see if I can figure out how to get those to YouTube. However, the camera has some short comings, like you can set the zoom prior to starting your video but not during the video. I could not seem to get a good shot of the GPS device, difficult to read the screen. Lastly, my running site is at the end of the lake so it is difficult to get a shot of the boat running by and it I go out to far then I am running by the dam and I want to be careful there!

I don't want to complain because the boat is a great running MM, but I just know that 60MPH is in there somewhere. It's just hiding from me right now!