crispyspa

I was given this hull about a year ago along with a Graupner drive. I installed the drive and proceeded to blow the motor because I overvolted it by 12 or so volts. LOL
I bought an Aquastar 2200kv motor and some aluminum parts and set out....I get about 4-5 minutes of run time and the batteries get real hot. I was in too much of a hurry to grab my watt meter on the way out the door so I have no idea of the amp draw. I'm guessing I'm drawing over 100a.

The specifics:
Turnigy Aquastar 2200 kv brushless motor
Castle 200a ESC Hydra ice
Octura x440 prop
Turnigy Nanotech 65-130c 5000mah batteries.
6lb 7oz without batteries.
1lb for each battery (2)

Here is the maiden run:

https://www.youtube.com/watch?v=bLA32CUMATE
I think I need to prop down, but being a Noob, I have no idea what I might need. I started at the x440. I looked through the list of Octura props and I just cant settle on what I need. Smaller diameter prop? Less pitch?

Patrick125

Watching your video I will say I am shocked that the boat got on plane not to mention how fast it ran. I believe you are running to long on those cells which is why they are getting hot. If you can get a multimeter take it with you when you run, run for 2 minutes then measure the battery voltage. From my experience I will suggest that if the meter give a reading of 3.8volts per cell don't discharge anymore. Over discharging causes the cells to get hot and the heat will damage the lipos. But the boat looks fast. One more thing, I would like to suggest that you monitor motor temperature, speed control and battery temperatures, you are probably mindful that heat kills electronic, magnets, burns insulation on the motor windings and the list goes on.

timjz

My Feedback: (1)

You have an Dumas Deep Vee 40. I have the exact same boat with a 3.5cc outboard. I'm jealous of the green metal flake!
Your boat is the fastest old deep vee I've ever seen! I wonder if the hook has been taken out of your hull, it handles pretty well at speed!

crispyspa

Why? Is there something that doesn't look right in the set up?

I have the cutoff on the ESC set at 3.2v per cell The batteries on my infrared temp gauge went flat and I forgot to take along my watt meter. I was in a hurry to get it in the water.

I did order a smaller prop. Octura x438 two blade. I don't think I can go any smaller without changing prop shaft diameter to 1/8". Hopefully that little bit of prop reduction will cool things down. It is a Turnigy motor, it's probably inefficient as all get out. Maybe I can mess with the motor timing too. I have no idea, that's why I'm here asking questions but given the lack of response to a lot of posts in this forum, most of the "old guys" that had most of the knowledge base don't come here anymore.

timjz

My Feedback: (1)

By the way, you are turning waaayyy more than 25k rpm!
That setup has a theoretical top speed over 100 mph

crispyspa

Is that what that is? The guy I got it from didn't remember. I'll put a GPS on it next time I run. What is "the hook"?

When it's going fast the whole hull leans left (or was it right?) Right i think..hmmm. I'll have to watch the video again. LOL I've never ran a monohull before so I am unfamiliar with how they should act.

crispyspa

LOL Holy crap! Like I said....I'm a noob.

Got a link to that calculator?

timjz

My Feedback: (1)

I made the calculator, send me your email & I'll send you a copy.

timjz

My Feedback: (1)

This is what "hook" means. I know my boat has it.
(not my picture)

crispyspa

Oh, OK. Yeah. It had a little bit when I shot the video, but I've since worked on it and got most of it out. Over a length of 14" from stern it probably has 1/32 or maybe 3/64 hook. It used to be better than an 1/8".

Patrick125

I have an aquacraft rio ep, the rio is just over 25 inches and it is light about 48 ounches or 3 pound with everything including a 15ounch battery. The boat will not plane with a 36 mm 3 blade prop, I cannot go smaller than 42 mm in the area where I live. I did a test to understand the impact on performance with additional weight, when I increased the weight from 3 pounds to around 4 pounds the boat manage to still plane but the speed was down about 1.5 mph, when I added close to another pound given a total of just under 5 pounds the boat would not plane with the 42mm prop. That is why I was shock that your boat which is way bigger and heavier got on plane with a 40mm prop. Your 440 prop or a 442 prop would be ideal for your motor, you should be running 4s with that kv, but if 6s is giving manageable motor heat I don't see why not try it.

crispyspa

I was having problems with the speed control a while back and the guys at Castle had no idea what the problem was. I think I found the problem today. Probably the reason for the high amp draw and the hot batteries also.
The last reading on the Watt meter was 107a before it shut down, way below the advertised spec of 200a.
https://www.youtube.com/watch?v=CogLiEV9EeQ

I sent the link to the video to Castle. We'll see what they say.

Patrick125

That does not look like a water cooled speed control to me, you can correct me if I am wrong. If this is the case, I cannot imagine parts not failing, motors and speed control can heat up without load and under running conditions the heat built up is far worse which is probably why you had that part melting off and the damage capacitors. The Hifel swordfish series is water cooled and some can handle over 100amps depending on what you buy also hobbyking seaking speedcontrols are water cooled too. I have good experience with the hifel swordfish 120 and the hobbyking seaking 120 and them both and getting good reliable service from both of them.

crispyspa

Yup Patrick, it is water cooled. It's the castle hydra ice 200HV. I actually did buy a swordfish lite 300a and the cooling tubes were blocked and it did LITERALLY nothing when I hooked it up. I sent it back a month ago and haven't heard a word back. The only ESC I haven't had trouble with are the Turnigy ones.

ryan_t888

That setup appears to be of a very hot nature.

You can run a calculation here http://www.radiocontrolinfo.com/info...tor/#Brushless.

I'd suggest 4s on a 2200kv motor. Anything more can be difficult to keep with in a safe limit.

crispyspa

I filled the hook in the hull and also created a bit wider ride pad on the bottom. It's running pretty good on 4 cells but I'm itching to see what it'll do on 5 or 6. Also not running the x440 prop either, it's a cnc 38mm aluminum prop CNC 3814 Magnalium 7075 propeller. I think I may try the m438 prop I got to see what that does.

https://www.youtube.com/watch?v=N5z6_7W_HEk

n.h.schmidt

That was fun to watch. Your boat is fast. I think you are going in the wrong direction with the props. A boat that size often needs a larger prop to get up on plain . A Octura M445 would run it nicely. I suspect your heat problems may be due to a overly heavy hull . Please cover the hatch. I have seen too many boats sink.You are on borrowed time running open. If you want to go cheap on props to test the Graupner K series CF props allow very rapid plain out. The K42 or K45 would run your boat to good speed. They are available with a 3/16" hub.
n.h.schmidt

crispyspa

I got the bow stuffed with bubble wrap...she wont sink. LOL.
Seems counter intuitive to go bigger in props to reduce heat, Please explain.

The Castle Hydra Ice 200hv took another dump. Doesn't work. It's good they quit making them because I'd never buy another one anyway. How does a speed control work at the end of a run one day, and not work the very next time you try to run? I was only running 4 cells and the logging data only showed a peak of 120a.

n.h.schmidt

Not sinking is real good. Not getting the insides wet with a flip over is even better. A hatch well taped on and done right can keep nearly all water out of the boat until you get it back.
Many waterproof ESCs are only water resistant. I have lost more than one waterproof esc. You have already gone about as small possible with your props.The efficiency goes way down as your prop size becomes too small for the boat. The smaller the prop the more slippage.I don't have a motor to suggest but I think you may need something better able to handle the load put upon it. If you were racing, the heats are usually done in under a min and a half. Heat wouldn't be a problem so much. 4min or more runs with the speeds you are getting is a lot.
n.h.schmidt

Patrick125

How does a speed control work at the end of a run and not work the next day? If the speed control gets water splashed on it that will happen, you are running without the top fully covered so it's almost 100% garanteed that your speed control will get water splashed on it and behaviour the way yours is acting. What you need to do is get a good oil like transmission fluid or some other to dispell water and pour some in the speed control and test the speed control after a 5 minutes, if this don't work take off the strink wrap and brush the oil over the circuit board and test again.

I had to do this for myself more than once to get my speed control to work again.

The speed control that I use had to be reset with the transmitter more that once to work again.

Don't be afraid to reset you esc if it don't work after using the oil to dispell the water.

Also someone recomended using a bigger prop. I agree 100% with that suggestion, if I had that boat I wouldn't be using any prop smaller than 45mm, I would go with something like 50mm. Maybe you can try 3cells with your motor and a bigger prop.

Bigger props of a simular design will always be more efficient. Example x450 vs x440. I think a x450 will be a good prop for that heavy boat but I don't think I would try 4cells on your motor with the x450 without working up from 2 cells, then 3 cells and so on, testing for heating issues. If the heat is under control try another cell and see how it goes.

Patrick125

I did not look at your data logging reading initially, so after looking at the data log reading your battery was down to 12 volts or slightly lower meaning your cells are running too hard in my opinion, if it was at 15 volts at peak amps then you could use a bigger prop. But your cells are over working so that means you need a smaller prop on 4cell or you need to use 3 cells.

I see that your motor is rated at 100amps max, so your motor has passed its limited. That 100amp rating on the motor is likely max for a short run, like 15 or 20 secs, so your motor is over loaded.

This says to me that your boat is to bigger and heavy for your setup. So it seems to me that you need to find a smaller, lighter hull for your motor and cells if you want them to last.

The solution for you would be to get a bigger motor with a lower kv like say 1400kv and use 6cells and a x450 or another good 50mm prop. I would go as far to say get a leopard 56 or 58 series motor with 1300 to 1400kv if you wanted to keep that boat fast and still a little altot easier on the cells, speed control and motor.

crispyspa

Everything was completely dry inside, not even a drop through the stuffing tube. I think Castle quit making them because they were failing at such a high rate they were losing their a** in warranty work. I've ordered a Turnigy 180. The one I used for a conversion years ago is still going strong. no problems, same motor and 5 cells.

What about this motor? 4084 1050kv 160a
http://www.hobbyking.com/hobbyking/s...ess_Motor.html

I'm not finding any water cooled leopard motors. Where do I find them?

Patrick125

That motor looks great, it would workout perfect if you get a bigger prop. Go for a octura x450 or a prop around that size and run 6cells lipo with that motor. Also I think you need to look into getting a hatch to cover the top in the event that the boat is running in choppy water and splashing water or if it flips to protect your equipment.

crispyspa

On your advise, I purchased the motor and prop. I hope you're right, otherwise you'll be to blame.

All installed, need to test.
The prop picture is a cnc 3814 and a cnc 5014

Everything is waterproof, I'm not worried. I plan to run two 5 cell 5000mah in parallel for some stupid run times and switch to 6s when I want to go fast.

crispyspa

Patrick, I have to say you were spot on. I love this boat now. It's my new favorite. It runs cool, is fairly fast and has STUPID run times. I paralleled two 5000mAh 5 cells for 10,000mah. I seriously got tired of running before the batteries went dead. 20+ minutes. On 6 cells @ 5000Mah a solid 10 minute run time, not all at full throttle because it was so rough, but dang...

I'll now spend the winter cleaning it up and making a hatch cover because I darn near lost my gps.
I may squeeze in a speed run later this year. as it stands in rough water it made 33 mph.

Here is a video for all to enjoy:
https://youtu.be/CUXix7Glbfo