25" deep vee questions!! answers will help alot!!!

[Matt_1234]

Hey guy, I have a 25" artr brushless boat!! It's handlaid fiberglass and I am just wondering if there is any way to prevent getting holes in the hull??? I found a hole that is only about 1mm in diameter which is tiny and won't decrease the performance of the boat in any way!! I just used a bit of araldite both sides of the hull to patch it up!! Answers will be much appreciated!!! Also I will be upgrading the esc to a 120amp one from hobbyking and a 380 7xl motor with only a small 380 water cooling jacket cause the long ones were out of stock!! They will be used on 3cell!! Will they both handle the 3cell without overheating??? Also I have the old 380L 2881kv in it now and had a 30 amp car esc in it!! I have a 3Cell 2200 mah battery!! I was running it and it only ran for about 1minute I was begging to think there was something wrong with the motor so I bout the XL !! Would it be the batteries or the motor because I am sure they would last longer than 1minute???? Help will be much appreciated
Thanks alot
Matt

[blackcat26]

Thats a pretty weak setup for that size boat. I as well as others on here run 36mm can which is the 540 size motors. Your batteries may not be up to par either being just 2200mah. (I am running (2) 2s 5000mah batts in mine) As far as holes in the hull, this should not happen unless something is coming into contact with it. Like UFO's un-recognized floating objects in the water.

[siberianhusky]

Batteries! try 5000mah. You draw 1.1 amps out of that battery you have and you're already at 50% capacity. 3-5 minutes is a good run for a fast electric boat.
You would get longer run times with a 4s set up for the same speed, you will be drawing fewer amps which equals cooler and longer run times.
4s same 120 amp esc and about 2000kv motor.
Took me ages to figure this stuff out, finally an electrician boater buddy explained it to me in terms a brick layer can understand!
for equal speed less volts = more amps, more volts = less amps.
14.4v x 30 amps = 432 watts 11.1v x 39 amps = 432.9 watts.
Almost a 10 amp difference for the same watts.
These are just sample values that do not relate to anything real world, just used 30 because you mentioned a 30 amp esc.

[Matt_1234]

oh ok so do you have the same boat or just the same size hull??? well i would think its a good setup becuase the motor i have in it now which is a 380L 2881kv is pretty fast!!! but now i am upgrading to a 3300 kv 380xl motor so it should be a fair bit faster!!! well heres a picture of the hole and a picture of the boat!!!
thanks alot

[Matt_1234]

thanks siberianhusky
well i was thinking about putting my 2x3cells in parallel to have a 4400mah pack!!! and i will have a 120amp esc and the 380 7xl motor which is 3200 kv or something like that!! will that motor and esc heat up at all to flaten the whole 4500mah 3cell pack??? thanks alot for your help!!!
matt

[Basstronics]

I have the same boat.

Ran fast with a huge 380 motor- 2868- KV close to 3000kV.

You want a good 36mm can motor. Unless you go for the rather large 68mm long ones- and even those are smaller than the 36mm can motors.

I would look into a Leopard motor for this boat. Again I have the same boat and thats what I intend to do.

[siberianhusky]

LOL and probably a 30 second run time! More kv will only make the problem you were talking about worse, you are going to use more power to make more rpm, no free ride, You would need to go to a lower kv motor to extend run times.
Hull makes no difference, it's all math, you only have so much "gas in the tank", the motor is going to produce so many watts and use this many amps to do it.
Make sure you put a smaller prop on it when you put your higher kv motor in it, big prop on a high rpm motor = poof! higher amp draw = more heat, could cook the magnets in the motor or the esc or puff the batteries by trying to draw to much current from them.
As I said no free ride, it's a complete power system that has to be designed to work together from the batteries to the prop.

[Matt_1234]

yeah well i just bought the feigo 380xl and it states that it puts out the same watts as a 540s on 3cell!!! the feigo xl is 68mm long so its the big 380's. have you had any holes in your hull??? Can you send me a picture of your setup!!! how is your boat holding up??? Mine seems to handle very well!! i think the key is to have it evenly weighted on both sides am i right???? i also havent had to touch any of the trim tabs or any of the hardware!!!!

[Matt_1234]

that isnt too good siberianhusky!!! so if i put the 2 batteries together it wont make much difference???

[befu]

well heres a picture of the hole and a picture of the boat!!!
thanks alot

That looks like an airbubble that was in the gelcoat, a simple layup flaw. If there are more already there, they may eventually cause the gelcoat to pop and show up, may never. Patch it and go on, you shouldn't find more. Future holes will be to sudden deceleration while running fast caused by an external force. Or, often referenced as "oops" events.

Also, calm down some. We know you are excited, but not every sentence has to end with "!!" or a question mark. Too much Caffeine by chance or you just REALLY like rc boating.

A cheaper setup that I did on a 24" wild thing mono was 3650-2300 turnigy inrunner running on 3s-3600 pushing a 38mm plastic prop on a stinger drive. It runs low to mid 30's for speed, amperage peaks around 30amps at WOT in the straights and it will last up to 10 minutes on that setup. Not a race boat, but mid 30's is still fun and a reliable setup.

A 380long motor should also work, as well as some of the 450 size outrunners. A 600 series outrunner would be some serios power, depends on what you want.

Brian

[siberianhusky]

I was slow typing and ended up a couple posts behind, running the two batteries will make a huge difference, more capacity!
Be carefull with that new motor when choosing your prop, fiagos can run hot!
I don't balance my boats evenly, they are loaded to one side to counter act the prop roll, they lean to one side at rest but run level at speed, the boat runs straighter that way, a mono automaticaly turns when it leans over. Less drag than using a trim tab to level the ride or adjusting the rudder trim to one side.

[Matt_1234]

Well i have a a 35mm prop on it now, should i go smaller?. oh ok so the hole was just a little airbubble and the platic coating over the fibreglass had peeled off making a hole. it wasnt right through the hull but i made sure i patched it up well so it doesnt leak. i haven't found any more of those because i havent run the boat since the weekend, hopefully there isnt anymore. i was thinking about putting both the batteries in parallel to make more capacity but i'm not sure if the esc and motor will last a fully charged 4400mah 3cell attery without getting too hot? im sure the esc will be fine but worried about the new motor. it was around $70 shipped so i dont really want to stuff it up becuase in my opinion thats fairly expensive for a 380 motor.
thanks alot for your answers

[Diesel6401]

Looks like you got yourself a Prince/Rocket hull, nice boats. The 380 size can is not the best choice. Yes it states it puts out the same power as a 540 (s) can which is only about 400 or so watts. I have a hull similar size to your hull and I run ul1 power. You would get better results going to a 540 size setup such as ul1 power or sv27r power are good choices for that hull. If you get yourself a good size motor you can push this hull pretty good. New batteries would be a must as well for example I run a 2200mah 3s battery in a 16" hull with a VERY small motor. Your setup is working your batts way to hard. Jan sells alot of parts for that boat http://kintecracing.com/Prince_Upgrades.html JMO, happy boating!!! Welcome to OSE.

You could sell your 380 here on the swap shop and pick up a used motor here as well for cheap instead of buying new.

[Flying Scotsman]

yeah well i just bought the feigo 380xl and it states that it puts out the same watts as a 540s on 3cell!!! the feigo xl is 68mm long so its the big 380's. have you had any holes in your hull??? Can you send me a picture of your setup!!! how is your boat holding up??? Mine seems to handle very well!! i think the key is to have it evenly weighted on both sides am i right???? i also havent had to touch any of the trim tabs or any of the hardware!!!!

Laddie, you have had some good advice....calm down...please.

Douggie

[Matt_1234]

Well I was going to upgrade to 540 brushless but the stock motor mount only holds 380 brushless. What can I do about that? Cause I can't really cut the motor mount out cause that's pretty hard?? Also if I want to sell the 2x 380 motors( to upgrade to 540) on here how much do you think I would get for them?? One motor is a 380L and the other will be a 380 xl I could also throw in the 2x 3cells 2200mah and upgrade batteries how much do you think I would get in total??? Thanks alot