I was told and ignored

[Luck as a Constant]

I was told and ignored

Wow! Maybe your just lucky or way under propped. Good for you! But I'm stating what my rule of thumb is. I've seen way too many issues from running too weak of a battery....your experienced. ...maybe the next guy isnt. I would never recommend nor say that a 25c battery is good in a boat that size unless you never push it hard at all. You know this too so I'm not sure why you'd throw something out there like that. A boat draws a good bit more current than a car or truck so why would you act like it's just generally ok? It's always better to have a battery that's more than up to the task than one that's just borderline and I think you know that.....so that's being realistic for you.

i have run 20c up to 40c. obviously 40c does better in any setup, but for a stock rtr the 20c packs did ok. most of the heat generated in the packs is when they start to dump their load. then things heat up quick. better to watch runtimes...
is 50c better? yes.....is 50c or higher necessary to run a boat? not even close...

To say "never" use anything less than 50c in a boat is kinda ridiculous dude... i gotta side with doby on this

[Luck as a Constant]

I was told and ignored

To the op, I wouldn't bother with a 3 blade on a cat.
As far as heat. If you want to bring temps down, shorten runtime a bit.



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[kfxguy]

i have run 20c up to 40c. obviously 40c does better in any setup, but for a stock rtr the 20c packs did ok. most of the heat generated in the packs is when they start to dump their load. then things heat up quick. better to watch runtimes...
is 50c better? yes.....is 50c or higher necessary to run a boat? not even close...

To say "never" use anything less than 50c in a boat is kinda ridiculous dude... i gotta side with doby on this

Everyone is entitled to their opinion.

[Luck as a Constant]

I was told and ignored

Everyone is entitled to their opinion.

This is true. Which is precisely why you should state that it's your opinion when making those kinds of statements man.
It hardly came off as your opinion
Just my opinion tho lol


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[kfxguy]

This is true. Which is precisely why you should state that it's your opinion when making those kinds of statements man.
It hardly came off as your opinion
Just my opinion tho lol


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Wasn't my opinion. ...was based on actual experience.

[jfrancisco892]

C rating is a number that does not always represent what it is supposed to in batteries. More often than not the quality of the cells (typically contingent on the manufacturer) is more important than the C rating. The C rating is simply a coefficient to determine maximum constant amperage that the cells are capable of. That being said you can have a higher constant amperage rating with cells that have a lower C rating compared to cells with higher C rating depending on the capacity. To simply say "do not run batteries less than 50c in boats" is completely ambiguous and terrible advice.

Maximum constant amperage = Battery capacity in Amp Hours (Amp hours = Mah/1000) x C Rating of Batteries

Regarding a 3 blade prop on the boat, I will say that I have a Motley Crew (Same hull as lucas just different hardware) and have had much success with an Octura X440/3 on it for offshore trim.

Be sure to make sure the flex cable properly aligns with the flex coupler on the motor. If you have to move the motor or brass tube to get the flex cable in the collet, it will surely cause more drag on the drive line which in turn results in more load on the motor and more heat.

[kfxguy]

C rating is a number that does not always represent what it is supposed to in batteries. More often than not the quality of the cells (typically contingent on the manufacturer) is more important than the C rating. The C rating is simply a coefficient to determine maximum constant amperage that the cells are capable of. That being said you can have a higher constant amperage rating with cells that have a lower C rating compared to cells with higher C rating depending on the capacity. To simply say "do not run batteries less than 50c in boats" is completely ambiguous and terrible advice.

Maximum constant amperage = Battery capacity in Amp Hours (Amp hours = Mah/1000) x C Rating of Batteries

Regarding a 3 blade prop on the boat, I will say that I have a Motley Crew (Same hull as lucas just different hardware) and have had much success with an Octura X440/3 on it for offshore trim.

Be sure to make sure the flex cable properly aligns with the flex coupler on the motor. If you have to move the motor or brass tube to get the flex cable in the collet, it will surely cause more drag on the drive line which in turn results in more load on the motor and more heat.

It's always terrible advice to recommend using a better battery? Sorry, do not see your logic there. I see you have a dragster as your avatar, so if that means anything to you I'll give you an example you can relate to. Say you build this engine, it has 11.5 to 1 compression, you know it can run on 91 octane, but...it's cutting it close. So do you:
A) say screw it, I'll chance it on 91 or
B) you go ahead and run it on 93 because you know it's safer and gives you more of a margin for error (tune, too lean, high air intake temps).

In my mind, the better thing to do is have the safety margin. So yea, go ahead and keep recommending the use of lower amp batteries and people will keep posting here that their esc burnt....their wires get hot, connectors get hot, melt or come unsoldered, their batteries puff.....Me....I'll kick back and think about the ambiguous and terrible advice I'm giving and just keep it to myself for now on.

[jfrancisco892]

It's always terrible advice to recommend using a better battery? Sorry, do not see your logic there. I see you have a dragster as your avatar, so if that means anything to you I'll give you an example you can relate to. Say you build this engine, it has 11.5 to 1 compression, you know it can run on 91 octane, but...it's cutting it close. So do you:
A) say screw it, I'll chance it on 91 or
B) you go ahead and run it on 93 because you know it's safer and gives you more of a margin for error (tune, too lean, high air intake temps).

In my mind, the better thing to do is have the safety margin. So yea, go ahead and keep recommending the use of lower amp batteries and people will keep posting here that their esc burnt....their wires get hot, connectors get hot, melt or come unsoldered, their batteries puff.....Me....I'll kick back and think about the ambiguous and terrible advice I'm giving and just keep it to myself for now on.

It's terrible because you said it as if it is a standard to run 50c or better batteries. Based on that logic you can't run Hyperion batteries in boats since the highest C rating they offer is 45c.

As far as the compression ratio goes, I'll just touch the tip of the iceberg and say compression ratio is only one of many factors to consider when determining what fuel to run. Why would I run 110 octane race fuel when pump gas would work just fine? Basically you are saying that if you were racing a production vehicle you would run the most expensive race gas you could just to make sure the car would not have any issues (All of these references translate into fe boats with battery choice). Also the difference between 91 and 93 is so minimal both price and performance wise that it doesn't fit as a reference when comparing batteries that are up to double the cost of cheaper alternatives.

Not everyone wants to put thousands of dollars into toy boats. Maybe they just want to have one to mess with every once in a while. In which case a high performance high C rated battery would be nothing more than a waste of money.

[Luck as a Constant]

I was told and ignored

Wasn't my opinion. ...was based on actual experience.

Noplease.
Nobody is arguing higher c isn't better, but your comment was way off man. You can debate this one all you want, but 50c isn't necessary to run a boat. Not even close.
-)


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[kfxguy]

I see why alot of people just quit posting here. Too many know it all's, professional advice correctors and self proclaimed experts. I'll just say you win. Carve yourself a notch on your keyboard......lol

[Luck as a Constant]

I see why alot of people just quit posting here. Too many know it all's, professional advice correctors and self proclaimed experts. I'll just say you win. Carve yourself a notch on your keyboard......lol

Lol is this not exactly what you're doing? Making statements as fact based on your experience? C'mon man don't get all offended cause we called you out on that. You made the comment not us. -)


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[Doug Smock]

please sirs.

[Luck as a Constant]

Sorry )


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[S_pisco7084]

Gees I forgot what my original post was. To end the debate. Nimh or nicad batteries are the future.

Back to topic I got my OSE flex shaft, it fit perfect. for now I'm using my stock plastic prop and I don't notice much of a difference compared to my unbalanced or unsharpened brass one. Still saving $ to order a ready to run prop.

[tlandauer]

That plastic 3 blade prop is one of my favorite props, I used it for a long time and still use it when i do testing sometime.
I am sure there was just as much debate when Nimh and Nicad were in use .