Mono Setup: Will this work?

[Keagan-Z06]

Hey all,

I have a friend who owns the below boat, he made it, it's his first boat and is doing all the setup on his own. I really can't give him advice as I have no clue of these things and just buy RTR until I can learn and do them myself. Do you guys see anything in his setup that would need adjustment? Parts change? He is seeking 75mph! The boat is not complete and these are all the pictures I have at the moment.

Swordfish 240A Pro II
I assume TP 4070 motors (can't confirm)
Props CNC 40mm
Under hull water pickups
Should be running 6s SMCs

I know this is vague but he is keeping info to a minimal at the moment.

IMG_0115.JPG

IMG_0114.JPG

The second picture is not the final resting place for the setup. It will have a flooring to cover the ESCs and the motors should sit on that flooring.

[Fluid]

Absolutely no way to tell if the setup will work. If he is unwilling to share details, then good luck to him. He will be lucky if it works.

At a minimum we need:

- hull dimensions and weight
- pic of hull bottom, transom
- details of motor - size, Kv
- prop diameter, pitch and number of blades
- pack details, capacity and C rating
- strut/stinger size and placement



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[fweasel]

its a boat alright.

[Keagan-Z06]

Sorry Fluid,

I know it's very vague and I know you know your stuff. Where can I get your book by the way? In regards to the hull dimensions, I am sure it's around 36" and dry weight was around 8lbs. I will try and get pics of the bottom and transom. I know he will be using 3/16 shafts and all he told me was 40mm CNC props. It will be a 2 blade prop. I will try to get more info and chime in.

[Erroneous]

Try to talk him out if the CNC prop. I only use them to get an idea on size and pitch and then go with the copper beryllium or stainless props for more permanent use. I seen and heard of too many CNC props warping, breaking or spinning off the hub all together. Especially if seeking 70+.

[Keagan-Z06]

Ok got 2 more pics for a bit of clarification

2016-10-03-PHOTO-00000182.jpg
Under hull pick up.

2016-10-03-PHOTO-00000183.jpg
I believe these were bought from RC bitz

[Keagan-Z06]

2016-10-09-PHOTO-00000210.jpg

Another pic, anyone else have any input. He is narrowing down on the finale now.

[boredom.is.me]

That can't be a 36" hull unless it's just really wide. Those motors look tiny in there, and tiny is one thing they are not.

Just ask him for the info the other guys asked for. Otherwise, there really is no point. Is the hull itself safely capable of high speed?

[Fluid]

How can we begin to help without knowing at least the boat size and the motor Kv? We can't, as mentioned above he can stop wasting our time if he can't give us even basic information. I wish him luck, he's gonna need it.



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[Keagan-Z06]

I have no idea, I don't know if its him not wanting to share the details or he just doesn't have the time. I am only going by what he said. It is wide indeed, I think a bit wider than Zelos. Where you see the motors in the last pic is the upper deck. The ESC's are gonna go below that.

[Keagan-Z06]

How can we begin to help without knowing at least the boat size and the motor Kv? We can't, as mentioned above he can stop wasting our time if he can't give us even basic information. I wish him luck, he's gonna need it.



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Yeah I think I'll just wait it out and see. When asked about the motors he "couldn't remember". When asked about the size he "thought" it was 36"

[centralrcmystic]

He can go at least 46mm on the props with 240amp ESC's depends what kv the motors are

[Keagan-Z06]

More info: Hull is 42" x 14"
TP 4070 1520KV
8S Per motor
48mm CNC props
Packs: SMC 6500-60C
Hardware: Strut 3/16" 85mm long x 100mm
CNC TFL trim tabs 54mm x 38mm
Turn fins 110mm x 47mm

[Keagan-Z06]

IMG_9249.jpg

IMG_8755.jpeg

[Fluid]

Looks like a potentially bad setup, especially for a newbie.

- Motor Kv is really too high for 8S, I set SAW records with a single-motored 8S hydro and a motor with the same Kv
- Need to know the prop pitch, number of blades, and if they are counter-rotating
- Turn fins are likely too small for good turning
- Tabs appear to be mounted too low, should be at least 1/16" above the bottom
- Struts may be mounted too high, the outside prop could be lifted free of the water as the hull leans into a turn

There is not much experience with twin monos, so especially with an untried original design he will have limited experienced support. What he gets won't likely be able to see the boat running to help evaluate any setup issues - videos are notoriously poor for evaluating boat performance, although they are better than nothing.

Any idea where someone with no building experience obtained the "knowledge" to set up the boat like he has? And why he is so secretive about the build? Why ask for help after all the parts are purchased and mounted in the boat.



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