GENESIS, first runs need help on settings

[Maciek74]

Hi,
I need some help :) just bought Genesis one week ago, then i realised i cant run it on weak batteries iam using for smallbolt (3s 2600-2800), iam using 6s packs 4000mah 20C for my Yak 55m so decided to go for 6s setup for Genesis too. Made some questions on HK discussion panel, found OSE shop and bought Leopard 3674 1700KV and couple of Octura props x442 445 448 (just incase, using x442now), my ESC is Turnigy Marine 180, batteries are Flightmax 6s 4000mah 20C.

Problem ocured when i made first test run, flat water perfect conditions, placed 2 batts in sponsons but connected only one (no spare connectors yet), started boat easy (damn its fast :") trimmed, made some curves then i started to speed up on straight course, boat went crazy for 2-3 seconds then engine automatically went to slow RPM and i couldnt accelerate again more than 20% of throttle (what is still quite fast). I stopped boat, switched to new battery, taped again but it was still on 20%, later this day i decided to try this again and situation repeated.

My question is whats, the solution for this issue, lack of C on baterries (maybe 2 parallel will do better what i will do when connnectors arrive), overheating of ESC (lack of cooling or bad settings), motor failure? or something else? waiting for your suggestions... :)

setting: Genesis stock RTR, Hitec Aurora9+optima6, upgrades: Leopard 3674 1700KV, Octura x442 (balanced and polished), traxxas waterproof servo

Regards
Maciek

[jamespl]

Lack of c rating will be one thing but the T180 esc is known to have low voltage cutoff probs so look into that too. Personally I would have gone with a 4074 or 4082. It's a pretty big hull and will need some good c rating batteries. I have some 25c 6000mah batteries but all the new ones I buy now are at least 40c and 5000mah. More mah will give you increased power too.

[1945dave]

Okay don't get discouraged this is old news on this forum, and not a major problem. James remarks are correct, the Turnigy ESC's are known to have this problem of low voltage cuttoff. Basically the eesc has a preset voltage that it detects as a low voltage concern and to protect your batteries the speed control will limit the power to half speed or there abouts. If you have a programming card the default setting is 3.2 volts. Try lowering the setting to 3.0 volts. Several guys have recommended that Turnigy ESC owners just turn off the low voltage cutoff. I am not comfortable doing that. I have ordered a stand alone lvc device that is regarded as very trustworthy and accurate, it cost about 20 bucks right here at OSE. On the other hand the programming settings for the Turnigy is off, 2.8, 3.0, 3.2, and 3.4 volts. I found setting my lvc to 3.0 was more to my liking and did not appear to discharge the batteries too low. You might look back a few weeks I stated that I had this problem on this forum and we worked through the problem in detail.

Dave

[Maciek74]

thanks a lot, i programmed manually my ESC now, will see results on water maybe tomorrow, how about propeller isnt it too big for up to 37k RPM? some ppl suggested smaller prop like x438 or maybe 3 blade prop?

and yet another question, is stock watercooling inlet in rudder enough for my setting? iam thinking about dual inlet from OSE 1 for motor one for esc, is it good idea?

[1945dave]

We need to watch how the ESC and the motor do from a heat perspective. I would rather go with a smaller prop to start and get larger not the other way around. I would think a X440 would be a good place to start but if you have a x438 we can try that too. Regarding 2 blade propos or 3 blade propos. Guys try to make more out of this than it needs to be. The three blade will push more water because of the extra blade area. Stay with 2 blades until you work the kinks out.

Dave

[Rumdog]

It is your packs. A single 6s pack at 20c, and 4000mah is only supplying 80 amps of continuous power. Run those packs in parallel, and you will be OK

[Maciek74]

Thanks a lot for advices, 2 packs in parallel eliminated the problem, 6 mins run with mostly on half throttle, some full throttle peaks and ESC on 60 celsius degrees, packs and engine on 40. looks like octura x442 works good on this setup :)