Smoke?

[alvinsmith75]

I know this is gonna sound crazy. I ran my UL-1 today for the first time since December. 4900mah 2s neu lipo's, m645 octura 2 blade, 1/2in. air damn, and 15/16th deep strut setting with a tad of negative. The boat ran the best it has ever run. The setup worked beautiful. It is 62degrees here so I heated my lipos' to about 95 degrees. After about 3 minutes of running the boat stopped. I let off the throttle completely and then re-applied. The boat took off fine, so I brought it back to shore to check it. When I untaped it and began to lift the hatch I noticed a small puff of smoke. I grabbed my temp gun and began to check temps. They were as follows:motor 105, batteries 98, and ESC 97. With that being said does anyone have any idea where the smoke may have came from? Right now everything is working fine. I am worried because the last time this happeded was with a hydra 240 except my boat didn't stop, it just let out a puff after a run, everything was working fine, then the next time I ran it the esc fried.
Please advise,
Alvin

[detox]

My UL1 did the same thing using a detunged 645, but I did not notice smoke. I am thinking maybe the big prop is causing esc to shut down (pulling TOO many amps).

[detox]

Were you on and off throttle more than once during run? Stopping then starting

[alvinsmith75]

Never came to a complete stop. I would say more like 3/4 to full throttle.

[Eyekandyboats]

could be just your motor melting a bit of excessive plastic.

[MarkJnK]

Is the prop shaft well lubricated? Could be the stuffing tube getting hot and starting to cook. I had this happen on my Mono a couple times, then the flex shaft must have gotten so hot that it seized inside the stuffing tube and snapped, after melting a section of stuffing tube.

Just a thought.

[Ub Hauled]

Alvin, things heat up more then necessary when you run at something less then full throttle,
if the boat does not stay in the water at full throttle you need to change something.
What color was the smoke? Does it smell like burnt electronics? Sometimes a little lub
fries during the run and once you open the hatch, poof! If this is the case, don't worry,
it's just oil...
If it fries let the guys from hobby Services deal with it, they were great when my speedo burnt and messed the motor up as well... I had a new one in my hands a week after they got it from me.

[AndyKunz]

STEAM perhaps?

Andy

[D. Newland]

Ditto the smell question: What did the smoke smell like?

Could the cause of the boat stopping be the radio failsafe (assuming it has one)? How far out was it when it stopped?

I had a little bit of smoke in my P mono a few weeks ago. No odor to it, but I did run the motor longer than it's been run before. I'm chaulking it up to some type of water/oil in the motor that burned off. I don't think it came from the ESC. I've run it 4 times since then and no more smoke/steam/Lost ghost.

[Grimracer]

Are you or did you place some fuel tubing over the stuffing tube/shaft exit on the motor side? If you did and did not oil it, it can burn the tubing (smoke)..

Having said this I dont recommend a X-645mm prop.. others might but if you are 3 mins into a X-645mm prop, you are past the limit of what the ESC can handle in the first place, and, doing so for 3 min.. Toss a Eagle Tree capture devise in the boat and let us know.. I bet you are WELL over 70 amps on this prop. .. ask me how i know.... lol.. I LOVE TESTING........

Please back off on the prop! Thanks!

Grim

[raptor347]

I'm guilty of recomending the prop in the first place thinking more racing than extended sport running. I would call a 645 a race prop. That means your going to run a race distance/duration. Think 1 1/3 mile and under 2 minutes. If it didn't smell bad, it was likely steam but look at the end of the capacitor and see if it's bulged. You likely hit the voltage cut off.

Try an x640, 40x57/3, 42x55, 38x55 (my favorite for run time and all around playing).

[alvinsmith75]

Ok 1st answer
prop shaft/flex cable was cleanes and lubed before that run.
2nd- boat handled beautifully @ full throttle enabling me to slow down only for turns. Thanks to Brian for the air damn advise.
3rd Smoke was white
4th didn't smell like burnt electronics
5th Steam don't know
6th Tactic radio-about 50 ft away-Seriously doubt radio issue
7th no fuel tubing over stuffing tube
8th End of cap not perfectly flat-maybe slightly bulged
9th Batteries were @ 7.4v each when I put them on charger
New finding-A dark(almost oil colored) liquid @ cap. end of esc, on hull bottom, and on cover.
Thanks for the help guys. I'll post pics soon of liquid. BTW the boat ran 48 on GPS.
Alvin

[Ub Hauled]

oh oh...
that may be the liquid from inside the cap, if that's the case,
don't run the ESC!!!
Check the cap closely and see if it looks like there was a leak...

[alvinsmith75]

Liquid on cover

on hull bottom

on cap

on finger LOL

[detox]

My UL1 capacitor appears bulged also, but no liquid. I have never seen this happen using the SV27 ESC with large props.

Look at this new UL1 esc in picture...notice new capacitor end is flat with no bulging.