setting up my 36inch mono

[rcboatfan]

what hard ware should i get, i will be running a neu 1521, batterys-undecided

[Fluid]

What hull? How many volts? Which 1521? We really can't help much without that info. The power level will determine the cable size, which determines the other hardware. Man, help us out here.....:crying:



.

[rcboatfan]

it was a scratch build and either 4s or 6s and a 1y

[rcboatfan]

anyone???????????

[hide]

Sounds very similar to mine. I've been advised by fellow members to use this and am in the process of making the boat now.

CC 120HV Hydra ESC
Neu 1521/1Y 1577KV 8mm Shaft
OSE 8mm Straight Couplers for .187 cable
Hughey .187 Assembled Cable for 3/16" Propellers
Teflon Liner for .187 flex cable
9/32 brass for Octura .187 Teflon tubing
Speedmaster Stinger Strut for 3/16" prop
Speedmaster 21 Rudder 5.25" Long Mono Rudder
Octura x447 Prop 3/16"

Mine is 34", fibreglass over wood & foam

[rcboatfan]

thanks!!! what prop should i start with (this is my first build so i dont know much)

[hide]

Not a clue (mine too).

[rcboatfan]

what are you running for batterys??

[hide]

Probably some 6S Lipos

[rcboatfan]

nice:cool2:

[rcboatfan]

is the hydra 120 going to be a high enough amp esc??

[Viking]

HI --Deep Vees you got to love them.
I spent all last summer building and testing a 36" fiberglass boat built on the lines of the classic Apache race boats of the 1980s.
a good place to start would be an Octura 442, That will get you running so you can fine tune your set up then prop up.
I got 50mph out of a Fiegao 9XL on 6S, 4800mAh loPos and an Octura M447.
That was in a very heavy hull built like the gas boats. I will pull a much lighter epoxy boat from my mold in the spring and start all over. You can read about it here
http://forums.offshoreelectrics.com/showthread.php?t=4406&page=3
Good Luck
Viking

[rcboatfan]

thanks viking!!!!how heavy is you hull?? i weighd mine and it is about 3 pounds

[DISAR]

HI --Deep Vees you got to love them.
I spent all last summer building and testing a 36" fiberglass boat built on the lines of the classic Apache race boats of the 1980s.
a good place to start would be an Octura 442, That will get you running so you can fine tune your set up then prop up.
I got 50mph out of a Fiegao 9XL on 6S, 4800mAh loPos and an Octura M447.
That was in a very heavy hull built like the gas boats. I will pull a much lighter epoxy boat from my mold in the spring and start all over. You can read about it here
http://forums.offshoreelectrics.com/showthread.php?t=4406&page=3
Good Luck
Viking

Hi Viking,

I remember your build. This setup is very hot and beyond the 9xl capabilities. How many times did you run the boat and for how long? Did you have any heat issues with the motor?

[Viking]

Hi rcboatfan;
The boat I was running , hull and deck weigh, 5lbs add 0.5lbs, for the hatch so 5.5lbs,. She weighs 9.5lbs ready to run with no hatch. The boat with the red orange yellow paint is a full pound lighter, but I think I can do better, and still have a very rugged hull.

DISAR;
I remember your informative advice at the start of my build Thankyou.
Early in testing I ran that set up with 4S, ESC is a Mystery 200A intil the batteries started to drop and everything was just comfortably warm to hold in your hand.
When the season got so cold that I stopped running I realized that all I had done was testing, with the exception of the runs down the lake driving from my sons boat.
Testing was 2 or 3 loops around a track size oval and then in to the dock to check temps, make adjustments and then out again, I wasn't running for fun, no long runs.
The runs down the lake (here http://www.youtube.com/fviking1 ) are straight full throttle and the load is surprisingly light ( Eagletree data logger) but they were not over a minute and a half or so and no temp issues there either.
Steven had the KB45 motors on sale (sold out) and I bought a 9 for that boat. When the weather warms I will make a new mold and make some lighter epoxy hulls.
Viking

[rcboatfan]

thanks for all the info!!!!!

[Viking]

Love the cat !
Viking

[rcboatfan]

lol i love it too:rofl:

[Chuck E Cheese]

i am looking for similar info. i have a 32" mono and am having problems with the heat. i run a feigao 10xl, etti 150 esc, 6s - 5000mah lipo's (can put out over 100amps). my problem is that i started with a x438 prop and temps were in the 150 range. i am trying to get high 40 to low 50 mph and with this small prop i can only get about 44 mph. i think that i can trim it out to lower the temp (it is pretty "wet" now) but i am scared to try a larger prop due to the heat. any suggestions are appreciated. a few questions are:

1) should i have a seprate cooling pick-up for the motor and esc or is 1 good enough?
2) is this etti 150amp enough esc for a 10xl on 6s?
3) what settings should i be using? i have timing low, pwm 8k, 18v cutoff, no brake

i allready fried a hydra 120 but truly believe it was defective because it only lasted about 30 feet and didnt have enough time to get hot also i never hit full throtle to pull too many amps.. the support line told me they would replace it but recomended lower timing and also thought the set-up was not the problem. the etti esc wasn't that hot but the motor was. i have proper gap and shaft alignment so that isnt it.... PLEASE HELP!!!

[Viking]

How long are you running the boat to get those temps?
One minute, two minutes, you got a broblem.
If you are running untill the batteries dump, ten minutes.
[U]Don't run it that long.
[U]
Viking

[Chuck E Cheese]

one minute

[Chuck E Cheese]

about 1 minute

[DISAR]

I would suggest to check the following:

COG about 30-32% from transom and trim tabs level

Where is the point on the motor with the highest temperature. Is it on the back side on the center? If it is that so, I would recommend to use a thrust bearing or leave a very small gap between strut and drive dog so that the thrust forces end up on the strut. To be honest I do not know which one is better, but I believe the thrust bearing.

[Flyguy55]

Chuck E , A 10XL too hot a motor for 6S
Fully charged the KV equals 39,000 RPM
Even at 21 Volts , thats 36,400 RPM .
Buy a 12XL if your sport running or at least a 11 XL and you can run bigger props and most of your heat problen will go away

Its not suprising you have heat.

[Chuck E Cheese]

i am willing to change up but want to get some speed out or this thing. using the calculation table with a 12xl (1390kv) and even a 445mm prop i only get 43 mph, with a 642 i get 46... do upi thing i will be able to swing the 642? i am looking to get more like 48-50... how can i achieve that out of this hull???

[Flyguy55]

I have yet to run a 6S mono. I just know that KVs coming out much over 30,000 is going to have heat problems .
I run a DF 33 on 4S2P NEU 1515 1Y . Performance is in your range .
I don't think Mad Mike Pag will mind sharing his set up simular to yours except 4S
If you want to run 6S , I'd try the 12XL , and not limit yoursels to 46MM props till you start getting some heat,
Or as I suggested , look at a 11XL and the props your suggesting

"I actually built one more boat, another deltaforce 33 mono" that has a Nemesis 10XL, and ran it on 4S2P with a 450/3 prop. It was fast and ran great also. I propped down to a 447/2 for racing because it was windy and choppy. I tried to run all 3 heats on the same set of cells, but forgot that I gave the boat to someone to try and he ran 6 or 7 laps, so 3 laps into the last race my boat was dead. I pulled it in and couldn't figure why it was dead. After a few minutes I remembered. "

[Viking]

Chuck;
If you spinn the drive line by spinning the prop nut will it make a couple of revolutions before it stopps? Is any thing binding ? Are you pulling the flex shaft and greasing the prop shaft after every run?
I ran my 36" deep vee with Fiegao 9XL for months this summer with up to an M447 at 49+ mph, with no heat issues. Short runs 1 1/2 minutes and more. At the end of the season I ran a 10XL for a while and no problems there and on 6S 4800mAh Elite LiPos also. I never ran a X438 the smallest prop was a X440 and the X442/3 gave me almost as much speed as the X645 at much lower Amp draw.
My boat weighs 9.5lbs ready to run. Your boat should be a rocket with that set up.
I wish I could examin it in the flesh.
Viking

[Chuck E Cheese]

ok i know what i am doing so i have the proper driveline set up, i use a bearing on the motor and a gap. i am going to try fly-guy's set up. i ordered a 12xl and varity of props from 642 to 645, i have 442, 445, 1450 to test with. if needed the 646,647 can be ordered but a 645 will get me 50mph which is all i am looking for. even at that speed my small pond gets real small..... it is about perfect for 40-45. i also got my watts up meter today that will help me get a grip on whats going on. thanks for all the advice and i will let you guys know what happens..

[Chuck E Cheese]

ok, one short run today.
12xl and 440 prop
1 1/2 min, check temp cool then 2 min with no time in between. temps all good, 64.5 peak amps.
boat slow, 40.8mph but temps low. tomorrow i will start proping up...

[Chuck E Cheese]

ok i ran it again today, didnt do much except put a x442 prop and have fun. got 45.5 mph and temps were low. it is a pretty good speed for the pond i was running. still need to work on the handeling a little. i ran it at the big pond and it could use some more speed but i was too busy with the gas boat (put a rcmk mod cylinder and piston plus carb today and was bussy tuning it, hauls the mail!!). then on the way home i ran it at the local pond (4 blocks from hone) and it was perfect speed there. here is a video
http://www.youtube.com/watch?v=w4xSwkBFyQE
thanks for the help.... 12xl fixed it just as fly guy told me it would. mabee i will put the 10xl in the mhz flash