Timing Question: Timing for 6XL?

[Meniscus]

I need some input regarding the following setup:

Nemesis 6XL 2779kv
180A ESC
4s1p 4550mah 33c/66c
Rigger and Hydro 24" to 26"
Props will be small to begin with.

What timing is recommended to start with? Runtime is not an initial concern.

Thanks!

[m4a1usr]

Low setting. If you want to sperament later go up but its best to start low.

John

[Meniscus]

Thanks. I'll start with 0 and see where I'm at.

[Xfactor]

Id start with 3s on that 6xl with maybe a x640

[Meniscus]

I appreciate the recommendation, but I don't have any 3s lipos that will handle that kind of amp draw safely. I'm going to be starting with a x637. I'm hoping that will put me at the 60 mark and move up from there.

[Fluid]

That's a great setup if you want to risk burning down.
The 6XL has a very high Kv for 4S, start with an x438. If the boat is running perfect the x637 could drive it to over 75 - which it won't so the result will be lots of heat. I'm wondering how successful you'll be with a 24" boat and 60+ mph; I ran boats that size and speed in SAWs years ago and besides needing very smooth water they were a real handful. I blew mine off a lot using 12 heavy NiMH cells.

DO NOT start with zero timing, that will cause overheating quickly. Timing has to match the amperage and design of the motor, the 6XL is a hot, high amp draw motor and needs some advance to run efficiently. No less than 10 degrees to start. You may end up with 20.

No matter what the timing used, this is a SAW setup and you'll have to watch the heat. No more than two passes and in to check for heat.


.

[Xfactor]

I tried to tell him fluid. 3s on that motor will do 50 plus with a 640 and a amp draw below 100. 4s on a 6xl with a 637 is whats gonna draw more amperage and possibly hurt your batteries, I have a 6xl in my 13th pay n pak. That hull is 26 inches long. The timing should be set according to the poles and stator arms.@ 4s you should go with a 8 or 9xl for you an 8 would probably do what you want.Not trying to discourage you but i agree with fluid the 6xl is a hot wind. Prop it wrong on 4 s and youll be way over 100 amps and burn that gurl up.Trust me my pak moves on 3s and your 2 inches shorter Im with fluid in that im wondering; Can you keep it on the water?

[Meniscus]

That's a great setup if you want to risk burning down.
The 6XL has a very high Kv for 4S, start with an x438. If the boat is running perfect the x637 could drive it to over 75 - which it won't so the result will be lots of heat. I'm wondering how successful you'll be with a 24" boat and 60+ mph; I ran boats that size and speed in SAWs years ago and besides needing very smooth water they were a real handful. I blew mine off a lot using 12 heavy NiMH cells.

DO NOT start with zero timing, that will cause overheating quickly. Timing has to match the amperage and design of the motor, the 6XL is a hot, high amp draw motor and needs some advance to run efficiently. No less than 10 degrees to start. You may end up with 20.

No matter what the timing used, this is a SAW setup and you'll have to watch the heat. No more than two passes and in to check for heat.


.

Thanks Jay. The timing was a major concern for me and I really appreciate the input. The rigger is a matrix that measures more like 25-26". She does 51mph super stable on a 2300kv motor. I don't have a lot of motors so I thought I'd try this one.

I'd prefer to go 2s2p and a 5000 or so kv motor. I have a Lehner Basic XL 5000, but I don't have the confidence that it has the power to push a model this size, especially considering how short the can is.

[NativePaul]

A stock X637 will pull way more than 60A, I have seen that setup used a few times in the UK for hydro2 and while the X637 is a good prop for it, it needs to be very heavily tongue and back cut to keep under 60A average so we can get our 5minute runtime +mill +in lap on a 560g 4s1p LiPo.

[Xfactor]

a 440 may be a better point to start for 4s if you insist lol

[Meniscus]

I'm not planning on ever running this setup for any length of time. I may start smaller, it just depends on my comfort level.

[Xfactor]

Well try it but you watch the temps closely. If youre gonna go 6series prop do a 635 or something.

[Meniscus]

OK, I figured I'd update this one. Last weekend I tried the setup on slightly advanced timing and she ran well. Judging from eye, she was right around 60mph, but still running a little wet. After the 1 minute run, temps were only warm to the touch and the lipos hardly got warm. The warmest thing was the 10 gauge wires going from the ESC to the motor. I didn't have my temp meter with me, but I would guess around 100 degrees F.

I'll be propping up next since the motor wound up within a half second or so on the straights. At the same time I think I'll be trying a prop with a little more pitch, raising the strut, and moving the COG back a 1/4" to loosen her up a little. I can imagine that if you tried to run this setup in anything but a rigger that you could easily build up some heat, but it seems to be working fine for me at the moment. We'll see how she does next. I'll also time the run so I can determine amp draw.

Thank you everyone for your input on this setup!