MHZ Ocean spray prop recommendation

[Rich]

Hi guys! I got my ocean spray running and was looking for prop recommendations. The hull is about 48" and I'm running the following:
Tp5670 600kv on 12s2p (2 sets of 6s packs wired in series then in parallel) 16,000 mah total.
300 swordfish x+
60mm 1.4 2 blade prop
Flex center line is 1/2" above the lowest point on bottom of the hull

I'm getting 52mph and everything comes in at a luke warm temp

I'm just a sport boater, I make a fast pass in a straight slow down for turns and repeat. I have a small body of water to run in. I'd like to see 60mph.

I just got an abc h 2514 cleaver prop and thought it looked to big. I thought I saw someone else running a similar setup with this prop so I purchased it.

Would this be a good prop for this setup?

Thanks,
Rich

[Brushman]

Hello ,

just curious, which 6s 8000 packs do you have? Brand, Weight, C rate? I hope you are using 6-8mm connectors? if the 8000 are CNHL 30C or turnigy graph?ne 15C, this is is fine...
with your 60mm prop, speed should be more than 55mph, anyway the 2514 will work well and should give you 10mph extra speed. your boat weights 25 lbs I think, and it will fly because the 2514 has no lift..

Vincent

[Rich]

[QUOTE=Brushman;756043]Hello ,

just curious, which 6s 8000 packs do you have? Brand, Weight, C rate? I hope you are using 6-8mm connectors? if the 8000 are CNHL 30C or turnigy graph?ne 15C, this is is fine...
with your 60mm prop, speed should be more than 55mph, anyway the 2514 will work well and should give you 10mph extra speed. your boat weights 25 lbs I think, and it will fly because the 2514 has no lift..

Vincent[/
Sorry I had to delete my previous post I have 8000 mah packs 120c rating that weigh 929 grams I'm using 8 mm connectors I'm just worried the motor and ESC couldn't handle a prop this big at this RPM

Thanks
Rich

[Brushman]

hello,

it seems you have SMC packs, I do not worry for the esc or batteries, only the motor will work at its maximum power, so making a two minutes run make sense. If your boat is reaching 65 mph with this prop, it will be fine, if it seems slower than with the 60m prop, stop the boat ...
I owned a Ocean spray, and this hull is not dragging...

Vincent

[Rich]

hello,

it seems you have SMC packs, I do not worry for the esc or batteries, only the motor will work at its maximum power, so making a two minutes run make sense. If your boat is reaching 65 mph with this prop, it will be fine, if it seems slower than with the 60m prop, stop the boat ...
I owned a Ocean spray, and this hull is not dragging...

Vincent

Vincent, you are correct I am running smc packs, sorry I forgot to mention that. I agree with you on the hull not dragging. I will try this prop out and see what it does. I'll give it a short run and check temps.
Thanks,
Rich

[Rich]

Vincent, I ran the boat today with the abc H 2514 and got 60mph. The motor was at 116F and the the esc and was at 105. The lipos were around 100f as well. I am happy with it so far. I will mess with esc settings when I get the programming cable to see if I can squeeze some more out of it.

[Brushman]

Hello Rich,

not surprised I do not see a 600kv 5670 in TP Power rpm tables, I bet it is a little lower Kv....
If it is a Wye winding, you can pick a few mph more by setting the timing from 5 to 15?, but take care of the motor temp. displacing some weight to the port side can help also to gain speed. Rudder lenght, thickness...Propeller thinning, sharpening. But 60mph is already good!

Vincent

[Rich]

Hello Rich,

not surprised I do not see a 600kv 5670 in TP Power rpm tables, I bet it is a little lower Kv....
If it is a Wye winding, you can pick a few mph more by setting the timing from 5 to 15?, but take care of the motor temp. displacing some weight to the port side can help also to gain speed. Rudder lenght, thickness...Propeller thinning, sharpening. But 60mph is already good!

Vincent

It is a wye wind motor according to the specs here on ose's store. You mentioned putting more weight on the port side. Is this to help offset the drag from the rudder being on the starboard side?

[Brushman]

No, a rudder blade can create some drag , but also lift on the starboard side. weight on the port side will counteract the prop torque. If your boat is going straight with zero trim on rudder, you do not have to worry.

[Rich]

No, a rudder blade can create some drag , but also lift on the starboard side. weight on the port side will counteract the prop torque. If your boat is going straight with zero trim on rudder, you do not have to worry.

I do notice when I throttle the boat will actually steer itself to the right a little bit

[Rich]

First off, I know this is an old thread but I finally got the equipment to paint this hull. I also added carbon fiber to the hull and the transom. I just ran it after I rebuilt it and got 52mph with the below setup.

p5670 600kv on 12s2p (2 sets of 6s packs wired in series then in parallel) 16,000 mah total.
300 swordfish x+
abc h 2514 cleaver prop balanced


My first question:
I notice the boat takes a bit to get on plane is this normal? Once on plane the hull seems to be locked in and handles very well with no bad tendencies. I probably could move the batteries back a bit to free it up.

2. Speaking of batteries, could I run my 2 6s 8000mah packs in series instead of running the 12s 2p setup I have?

3. Back to it taking a bit to get on plane. I notice that the I get a loud vibration from the prop right before it gets on plane. I noticed that the shaft wobbles when the boat is out of the water and I spin up the prop. I have balanced the prop. Is this behavior normal?

[srislash]

I am not familiar with MHZ Ocean Spray hull per se but if it is a dihedral hull as most of their offshore hull?s are then behaviour is normal. The prop shaft wobbling out of water is also normal although it gets worse if bushings or bearings wear. If you ran it then took it apart for paint the bearings on shaft will likely need replaced. This does create noise and such. Maybe try getting the prop deeper in the water to alleviate cavitation.
Shawn

[Rich]

I am not familiar with MHZ Ocean Spray hull per se but if it is a dihedral hull as most of their offshore hull?s are then behaviour is normal. The prop shaft wobbling out of water is also normal although it gets worse if bushings or bearings wear. If you ran it then took it apart for paint the bearings on shaft will likely need replaced. This does create noise and such. Maybe try getting the prop deeper in the water to alleviate cavitation.
Shawn

I was thinking of replacing the bushing seeing it does have some wear.

Are you thinking the prop is cavitating while trying to get on plane then, when it finally grips the water it gets loud because of the sudden load?

I could remove the stuffing tube and egg out the hole that goes through the hull to lower it more.

[srislash]

I was thinking of replacing the bushing seeing it does have some wear.

Are you thinking the prop is cavitating while trying to get on plane then, when it finally grips the water it gets loud because of the sudden load?

I could remove the stuffing tube and egg out the hole that goes through the hull to lower it more.

Yes this is my thought Rich, I have heard this on my own gear.
The goal is to have the bottom 1/3 of the prop diameter in the water on plane.

[Rich]

Yes this is my thought Rich, I have heard this on my own gear.
The goal is to have the bottom 1/3 of the prop diameter in the water on plane.

How can you tell if 1/3 of the prop diameter is in the water on plane?