Upgraded prop, now have some heat issues

[Back-lash]

I installed an Octura X645 prop on my Impulse 31 with stock running gear. About 3 minutes into the first run, boat went dead. This is what I found...

MeltedDean.jpg

The Dean connector melted. So, I'm going to upgrade all connectors to 5.5 bullet connectors. Should I worry about something else? The wires where touching the plastic cover, and got so hot that it slightly melted the cover. After the run the motor was warm but not really hot, and the same for the ESC.

[Fluid]

That prop is really a race setup on that boat/motor combo and will draw some serious amps. Race heats are usually 2 to 3 minutes long. You should either shorten your run time a bit or go to a slightly smaller prop like an m545 or m642. You cannot depend on how the motor or ESC 'felt', it probably took long enough to recover the boat that they had time to cool off.



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[DURAMAX11]

I ran a x642 on my mystic when it was stock (same motor/esc) and it caused some heat issues. I would even think about running a 645.

[Make-a-Wake]

Deans are only good up to around 60 amps and you were probably right there.......................bullets are best

[Back-lash]

I'm new to RC boats, but from what I can gather from these replies. The bullets will hold up, but I might be generating to much heat for the motor and ESC anyway with that prop. So it sounds like I should get a smaller prop, because if I don't I'll probably burnup the motor or ESC, or both. Is this accurate? Is there anything else I can do, without upgrading motor and ESC? I really liked the way the boat ran.

[Make-a-Wake]

Go to an x642..........

[Back-lash]

Sounds good. I'll go with the Octura X642 then. Hopefully that will solve my heat issues, and not lose too much speed then the X645. The boat ran real nice, at least for the little bit I was able to run it.

[DURAMAX11]

Deans are only good up to around 60 amps and you were probably right there.......................bullets are best

The deans weren't the problem. The s/b x642 melted the shrink wrap around the stock 1800kv motor connectors. That motor seemed to like the m445.

[Back-lash]

Well. I took everyones advise. I'm upgrading the connectors to 5.5 bullets. And I ordered an m445 prop. Hopefully I'll be back on the water soon. Any estimates on what speeds I should be getting. I know alot has to do with the water conditions, but I'm hoping it's noticeably faster than the stock prop.

[Back-lash]

Ok. Installed the m445 prop, and upgraded my battery connectors to 5.5 bullet connectors. Ran the boat for about 5 mins and the connectors from the motor to the ESC un-soldered itself. I believe they are 3.5 bullet connectors. When I upgraded to the 5.5 on the batteries, should I have upgraded those connectors as well? I'm hoping the m445 prop is not too much for the stock motor and ESC. Other than that, the boat ran great. I really think I have the trim tabs and strut set correctly.

[Diesel6401]

Ok. Installed the m445 prop, and upgraded my battery connectors to 5.5 bullet connectors. Ran the boat for about 5 mins and the connectors from the motor to the ESC un-soldered itself. I believe they are 3.5 bullet connectors. When I upgraded to the 5.5 on the batteries, should I have upgraded those connectors as well? I'm hoping the m445 prop is not too much for the stock motor and ESC. Other than that, the boat ran great. I really think I have the trim tabs and strut set correctly.

Yea you should have upgraded those as well. Before the boat ever hits the water the 3.5mm and deans plugs should be removed asap as they are the weak points of the boat. IMHO

Sent from my T-Mobile G2 using Tapatalk

[DURAMAX11]

Ok. Installed the m445 prop, and upgraded my battery connectors to 5.5 bullet connectors. Ran the boat for about 5 mins and the connectors from the motor to the ESC un-soldered itself. I believe they are 3.5 bullet connectors. When I upgraded to the 5.5 on the batteries, should I have upgraded those connectors as well? I'm hoping the m445 prop is not too much for the stock motor and ESC. Other than that, the boat ran great. I really think I have the trim tabs and strut set correctly.

Did you sharpen and balance the M445?

[dana]

Personally I would have put on an x442 or x440/3. 6 series props have a little too much pitch IMO. Stick with 4 series and smaller prop diameter for now. Jmo

[Make-a-Wake]

He's not running a 6 series...............its an m445, a detounged x445.

[dana]

I know. In a prior post he said he tried a 642 and melted connections. As for the m445,I personally don't like m props on v hulls. To each their own tho

[dana]

We maybe I got confuzzled... W/e lol I still stand by my suggestion

[Make-a-Wake]

Backlash, I desoldered motor bullets before as well...........as Diesel pointed out, when you upgrade the rest, its the weak point. I now use 5.5, 6.5 and 8.0's for all my motors depending on size. Make sure you give it a "good" solder job, not sure of your skills, but a cold solder will occur every now and then.

[SFC K]

I just ordered an X645 from Chris. Should I have picked something else? I plan on changing all connectors over to 5.5mm bullet connectors.

Back-Lash- How did it run with the M445?

[Back-lash]

The boat ran great with the M445. Don't know how fast it was going, but I would estimate in the 30's. SFC, if you are running stock motor and ESC, I wouldn't run the X645, it's too much prop for that setup. I'm going to upgrade the 3.5 bullets from the motor to ESC now to 5.5 bullets. Hopefully this will solve my heat issues, then I can run the boat like that for a while.

[SFC K]

That sucks. I just ordered the prop.

[dmwilson09]

SFC K,

I know a few months back when i was looking at props, I asked Darin (the designer of this boat) what a good prop for the impulse was and one of the props he mentioned was an X645. He said it was not uncommon to run that prop all day long with out any issues. Now he did recommended upgrading the bullets to 5.5 or bigger aswell. I ended up going with an X642 with 5.5 bullets, but that was because I didnt want to risk any chance of failure.

[Make-a-Wake]

That sucks. I just ordered the prop.

Yeah, that does..............especially when most posts on this thread said to stay away from it. Anyways, if you are good with props you can trim it down to 42mm if you find its too much as it is............i personally think its way too much. I have found every now and then when i went smaller I got more speed I'm obviously not a prop 'expert' but i think the m445 or x642 would be best................my opinion

[Skullcracken]

That esc might not handle that big of a prop, with the amp draw either. Everyone says deans only handle 60 amps or so. Guy run them in helicopters over 100 amps all the time. I've run 90 amps on a boat with traxxas plugs for nearly a year with no probs. And deans handle amps better than traxxas. Make sure you heat shrink those bullets good. POW!

[Skullcracken]

Just spend a little cash on a bigger esc

[Back-lash]

That esc might not handle that big of a prop, with the amp draw either. Everyone says deans only handle 60 amps or so. Guy run them in helicopters over 100 amps all the time. I've run 90 amps on a boat with traxxas plugs for nearly a year with no probs. And deans handle amps better than traxxas. Make sure you heat shrink those bullets good. POW!

I hear ya. I changed out to the bullet connectors, and put the male side on the batteries, now I have to be very careful that they don't touch, it makes quite a pop! I might redo them and put the female ends on the batteries so there is less of a chance of them touching. I'm no electrical expert, by any stretch. But it seems to me the wire coming off the motor and ESC are rather thin (I think 14 awg), is that an issue after installing the 5.5 bullet connectors. I'm sure the answer will include some basic electrical explanation, but just seemed odd to me.

[petej]

The x645 is too much prop for the stock motor and will destroy the motor. I run the 642 on my Impulse, WOT, get good acceleration and top-end speed. The stock boat also runs well with an M445, but the x642 can yield slightly faster speed.

[Make-a-Wake]

I hear ya. I changed out to the bullet connectors, and put the male side on the batteries, now I have to be very careful that they don't touch, it makes quite a pop! I might redo them and put the female ends on the batteries so there is less of a chance of them touching. I'm no electrical expert, by any stretch. But it seems to me the wire coming off the motor and ESC are rather thin (I think 14 awg), is that an issue after installing the 5.5 bullet connectors. I'm sure the answer will include some basic electrical explanation, but just seemed odd to me.

NO!!!!!!! You never put the same bullets on a battery..........one of each so thet dont touch and can be ran in series! The neg. wire gets the male bullet and pos. female, opposite on the ESC.

[Back-lash]

NO!!!!!!! You never put the same bullets on a battery..........one of each so thet dont touch and can be ran in series! The neg. wire gets the make bullet and pos. female, opposite on the ESC.

After doing some research this weekend, and NOW reading your reply. I'm going to change my connectors around. It makes perfect sense. Thanks again, for all the replies. You guys are really helping me out.

[Make-a-Wake]

Good deal.......................btw i meant to write that the neg. lead on the batt gets the male bullet not the 'make' bullet as i wrote, fixed it now.

[srislash]

Good deal.......................btw i meant to write that the neg. lead on the batt gets the male bullet not the 'make' bullet as i wrote, fixed it now.

Ahh, so there is a standard.Mine is the opposite,and I'm not switching all that now.That is the first I read of it.When I started on here I heard of guys plugging things in backwards in the heat of the moment.I figured opposing bullits was the way to avoid this.