Help! what is wrong with my setup???

[tlandauer]

If you are running the 1620kv motor, then your speed seems right with 4s and 5s....

[boilo56]

If you are running the 1620kv motor, then your speed seems right with 4s and 5s....

Yes it is the stock motor, so you think it is the normal speed for my current setup?

[tlandauer]

Well, 1620 on 4s is a relatively low kv set up. I have not run that kind of set up, but I didn't realize that was the motor your had, I thought the kv was above 2000 for some unclear reason and that's why I posted my response. I wish I did not say anything to mess up your thread.
Sorry.
I do think that the various responses from other members are excellent. 1620kv is really begging for 6s but I don't know the motor and it's quality, so i can't say anything. Your suspicion that the motor may not be up to the task may also be a valid one. At this juncture if these are the numbers you get consistently, then you need another motor to experiment, IMO.

[boilo56]

I would try a 1415-1Y Castle 2400kv, but the shaft is only 3.5mm, and i'm not sure if the shaft will be strong enough.

[Peter A]

Hi again, i have done some testing, on 4s and 5s. I tried the x442. 4s=52kph & 5s=60kph. my batteries were good for the 5s. But i still think it is slower than it should be. could it be the motor dying? According to the speed calc, it should be around 70kph. I know, don't take the result for cash. But still it gives an idea of where it should be. I've played with the data input, and to get to 60kph with my setup on 5s, either the motor efficiency is less than 80% with prop slippage at 25% or, 90% motor efficiency and more than 30% prop slippage... I'm totally lost here... Anybody have an isea?

It is very likely that the stock motor that you are running is only 80% efficient, it is not a great motor. It will get better when you get the aquastar motor in there. Be patient.

[boilo56]

It is very likely that the stock motor that you are running is only 80% efficient, it is not a great motor. It will get better when you get the aquastar motor in there. Be patient.

You're right, Peter, i'll be patient!

[Turbo Dan-O]

I don't have much to add other than I clocked mine at 41.3 MPH(66.4 KMH) today. Same boat/motor on 4s with an M445 prop. I have no experience on 5s+ with this setup but it looks like Make a Wake is right on. Boilo, maybe try backing down on the cells and playing with some props. Mine picked up over 8 MPH(12.8 KMH) just changing the prop...

[boilo56]

I don't have much to add other than I clocked mine at 41.3 MPH(66.4 KMH) today. Same boat/motor on 4s with an M445 prop. I have no experience on 5s+ with this setup but it looks like Make a Wake is right on. Boilo, maybe try backing down on the cells and playing with some props. Mine picked up over 8 MPH(12.8 KMH) just changing the prop...

It's something i'm planing to do, as soon as all my orders gets in. I'm waiting on my new setup, Turnigy marine 180 amp, 3974-2200 kv and a few more props, x443, x440/3 and x442/3.

[SD Eracer]

I have a 4082/2200kv running 4s2p and with a M445 mine is GPS'ed at 46 mph=74kph. I have not fine tuned it, it came straight from the previous seller. My boat has expansion foam and the COG is bow heavy, so this is actually a "wet running" boat, I bet there is more if I adjusted it better. Your speed should be faster as you said. Is your ESC 's throttle curve calibrated correctly with your transmitter?
What motor is in your stock boat?

I have the same setup on my new Pursuit, only other upgrades is a single piece .187 flexshaft and an Octura X642 prop, I am getting 50 mph (80 kph) on GPS on 4S, about 61 mph (98 kph) on 5S.

However, I am finding that the 4082 2200kv motor is a "amp hog", and very hard on my 2S 5000mAh 40C batteries. I can only get about a 2 minute run before I am down to 30% capacity on the Lipos. The motor and ESC are barely warm, but the batteries come out hot.

I may just go with my spare 4082 1600kv on 6S, it's seems to be a gentler setup.

[tlandauer]

That's why I run 4s2p, and I have decent run time and batteries seem to be doing fine. You are right, the 2200 motor is an amp hog.
Which motor is your GPS speed? 1600kv or 2200 kv on 4s1p ?

[SD Eracer]

It's the 2200kv.

I'll get only about 5-7 mph faster on the 1600kv on 6S compared to the 2200kv 4S setup (at least when that setup was in my Genesis), but the batteries are a whole lot cooler. The Seaking 180a I am using has upgraded Castle Capbanks and Castle 8mm connectors on everything. BEC-less as well.

[tlandauer]

Your speed is really good on that motor!

[SD Eracer]

Thanks, the tuning setup is pretty much stock. All I adjusted was the trim tabs down about 1.5 turns from neutral to push the nose down slightly, it was running really dry at first, but rides perfect on the rear pad now.

Someone should have told me those M4 x 6mm screws on the stinger fall out easily. I tightened them fully before my first run, and 3 out of the 4 fell off by my 4th run! Loctite from now on!

[Make-a-Wake]

1620kv is really begging for 6s but I don't know the motor and it's quality, so i can't say anything. Your suspicion that the motor may not be up to the task may also be a valid one. At this juncture if these are the numbers you get consistently, then you need another motor to experiment, IMO.

The motor would do well on 5-6s in a 26" hull which is then overkill on cells. Its a cheap 2 pole motor and only a 36 x 60mm in a largish hull.