Mean Machine new build help please

[mekzoid]

Hi all,
I have lurking for a couple of years, My name is Todd and live in Australia.
This will be my first time building so I after some advice if I could please.

This is my shopping list so far, hardware only as ill be building it in stages:

3/16 Adjustable Strut
5 Inch Rudder
CF Carbon Fiber ESC Mount
Carbon Fiber Servo mt Standard
motor mount
rubber boots
CF sheet for motor mount
2x CF-XL 300x56 Battery Tray
1/4 stuff tube
4mm id water tube
2x water outlets

Is there anything that I am missing for the first part of the build?
Next stage will be motor, prop and flexi cable, esc , servo etc
I am looking at the leopard 4082 1600kv with octura balanced x450, turnigy 180 amp speedy.
What would the difference be between the 4082 1600kv and 4092 1480? Will be running 6s

I wont be racing at this stage, Might do down the track. Just want to have some fun and hit the 100kmh mark.

from my research the above set up should be good for 65mph, would I be right in thinking that?

Any help would be greatly appreciated. Cheers!
Todd.

[tlandauer]

Welcome!
Just a heads up, you 3" rudder is too short for this hull, it will hook easily with said length. I find that even 1" longer helped, mine has the http://www.offshoreelectrics.com/pro...d=ros-spdr-001
It never spun out, originally I used this one and it is very prone to spining out: http://www.offshoreelectrics.com/pro...d=ros-spdr-005
Here is my build thread, not that important how i built it, but at the end there was some talk about rudder length with Dana who built his with a Neu 1515 /2200kv running on 5s with ballistic speed. http://forums.offshoreelectrics.com/...+machine+build

[mekzoid]

Excellent thanks for the advice, Ill adjust the list. You just made the build a bit less frustrating! :P When I get everything I will start a build thread too

[mekzoid]

Ill be putting the order in over the next 24 hours, Anyone see any faults in the build? It would be much appreciated.

[tlandauer]

Your list looks good, IMO the Mean Machine is not that big of a boat, a motor the size of 4082 is plenty. As said before, the guy who ran 5s with a Neu 1515 was using a m440 prop. I would start with a m445 and go either up or down. Also what size of cable do you intend to run--- .187 or .150?
The 1/4" tube would work for both but with the .187 cable you won't be able to use a liner---I am sure you already know.
I also don't think it is necessary to buy the longest battery tray; if you get your COG approximately right, it doesn't take THAT MUCH adjustment to achieve the correct COG. Unless you are planning to run 6s2p. ( two 3s on each side )
Just my $.02
Good luck and have lots of fun with your build.
P.S., I had the Speed Master strut and rudder, don't know which brand you are going to buy, but I must say I like the quality a lot more compared to the Chinese aluminum product. May be I am bias.

[mekzoid]

Thanks a lot for your input.
I will be using .187 cable with no liner.
I regards to the battery tray I was going to get the smallest one, But don't know how good my cog approximating will be!
Cheers on the prop size, That was one thing I was quite unsure off.

Thanks again!
I will be placing my order shortly! :)

[tlandauer]

You are welcome! Glad I can be of some help.

Well, I don't have the boat with me ( too many boats, I store them at my MOM's, lol...) , I think I used the 200mm long ones and they worked great. In all likelihood you will position them towards the rear of the boat. You need to actually get everything together to figure out the COG, I mount the hardware with double sided tape and place everything in the hull to approximate the COG.

[mekzoid]

Excellent thanks for that!
Annddddd OSE just ran out of mean machines last night
Guess I'll be putting the order in when they come back in stock.

[mekzoid]

Seeing as I now have a bit of time on my hands until the next shipment of hulls get in, Would any kindly recommend me a better motor then the leopard?
I am thinking the NEU 1515 as its had some great reviews. I just want to build a boat that I wont need to replace something later down the track cause it is slow or a low quality part has burnt out.

[tlandauer]

I use the Neu 1515 1y, love that motor. That motor can be pushed to run 5s with a M440 prop. Admittedly a Leopard will not die in the middle of the pond if the set up is correct, but Neu is more efficient and therefore runs cooler. As you already know that the bearings are better and the ability to sustain higher RPM has been proven. Not to mention the overall higher quality of materials and workmanship.
Reason that I didn't try the 5s is simple: I don't have matching lipos in 2s and 3s with the same capacities and discharge rate in my inventory.
One thing I can say is that the Neu is more like a 74mm long motor and is already a killer motor for that boat.
Which version of the hatch are you going to order? Funny thing was that when the ver.2 FE hatch came out I fell in love with it, but by the time I was building mine, I thought it was too bland, so mine is the ver1 hatch and turnes out to be a good thing bucause my motor was just to far forward and the newer version would not have been closed properly. It is more difficult to tape up so I have a sub hatch which I tape easily.

[mekzoid]

Yeah the thing is I used to race 1/10 EP on road competitively and was sponsored by my work and a few suppliers. Which made me accustomed to the best gear (addmittingly I never paid for a thing lol). I am quite out of my depth with boats, I obviously know the basics work etc, but setup/ props and motor selection is out of my field.


Could the 1515 handle 6s or should I get that out of my head? As I said I really want to hit 100kmh mark just as a goal. The 5s would be a lot cheaper as I would need to re buy all my batteries. Could I use a single 5s in the middle of the hull? If I could it would save me quite a bit of money buying single 5s's. With 5s and the 1515 from what I can see on youtube I should still be able to reach 100kmh.

I was going to get the version 3 hatch but the version 2 has really grown on me, I like the curves.

Once again I really appreciate your advice and knowledge.

Todd.

[tlandauer]

I don't think you will have room for a battery in the middle of the boat , unless you push the motor wayback and put your ESC on the side. The Neu 1515 1y is 2200kv, it will be too much to run 6s on it.
I don't have any 5s on hand and therefore i won't be able to advise you with this plan. You might also have a difficult time to locate your COG if the battery is in front of the motor.

[mekzoid]

Gosh you Americans don't sleep do you!
Oh sorry I didn't know it was 2200kv. Running 5s and 2200kv would = 40700rpm @ full charge, Isn't that quite high? Dana was running 5s2p however.

Using 1 5s would be worth having a look at I think. I do see how it could be a major issue. I could always use a led ballast up the front to help the cog couldn't I?

Would the neu 1521 be too much motor?
When people say its too motor for a boat what do they mean? Will it just cavatate or?

Could anyone else shed some light on this for me?

[tlandauer]

I meant your weight will be too far forward, if anything , you need to put weight in the back.
Well, Dana had the cells on the sides, so I think there is enough room for a single 5s on the sponson side.
When people say too much motor, it can be a number of things, too high a kv, too long and big a motor that has too much torque, or just too large a motor in a small boat that is not efficient. Set ups like Dana's would be hard on a single 5s, therefore he was running 5s2p.
Not familiar with that motor, if the KV is right for a 5s, why not? Keep in mind that you may not be able to use a prop larger than say 42mm with higher RPM.
I live on the west coast, it's only 8:36PM, but I just came back from China, having jet lag so my hours are all mixed up!

[mekzoid]

Oh Jet lag is always fun!
That is still doable, 5s2p. How do you work that? Do you just run a y cable off both black and red off the esc?