DaVette Aspect Shallow 42" Hull - New Build - Motor selection and misc. help needed

[gyrotron]

I am new to building FE boats so I need your help on my 1st project. I am reviving a DaVette 42" gas hull and making it into an FE boat. The hull is a seamless shallow V design 42" in length laminated by Mountain Hobbies. It weights 6 to 7 pounds and I am looking for motor and ESC suggestions for this project. I am looking for speeds around high 40's for now. Here is a preliminary sketch of the boat.

I appreciate everyone's help in advance. Thx

[Fluid]

This hull will run a bit wetter than the typical deep vee but should make a very nice sport boat. I would suggest either 8S or 10S voltage depending on the run time you want - higher voltage means longer run times at the same speed. A minimum 40C and 5000 mAh capacity for the packs, and running 2P will extend run time. The Leopard 56110 motor would be a good choice, the 620KV wind will give you the speed you want with decent run time. On 8S you could use props similar to the ones used on a gas sport motor, on 10S you will need a slightly smaller prop.




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[gyrotron]

Fluid,

I will be using 5" rails. I have a couple of motors laying around and a new SeaKing 180A ESC. Will these motors do the job for lets say, high 30's going 6S? Then I can move to the bigger motor you are suggesting. I am trying to use what I have now before I commit to buy anything else.

Thx

[RaceMechaniX]

Those motors are too small for that large and wet of a hull. You are looking at powering it with something equivalent to a Baja 5B. Think of the Castle 2028 size motor or similar.

Suggestions would be

Castle 2028
Leopard 5698 or 56100
Scorpion 5035

I would also stick with 8S or 10S and parallel packs. Shoot for a loaded RPM range between 16-22k which will allow reasonable prop selection for the speeds you are shooting for.

Tyler

[gyrotron]

Tyler,

I appreciate your contribution. I'll do the research on those motors you suggest. Is there a calculator program of some sort for motor selection? How do you usually go when selecting a motor? What about the ESC will it be aceptable for the Motor?

Thx

[RaceMechaniX]

Not really, it's experience more than anything which dictates good combos. I have plently of experience with the large motors in gas size boats and there are very few large motors suitable compared to smaller systems.

For an ESC, you will want to look for one with 10S-12S capability and between 150A to 240A. There are several good recommendations, however their prices vary signifigantly.

Castle Ice 200HV Best sport esc for the money and has data logging. Good service and interface is pretty straightforward
Swordfish 240HV I have no experience with this one
Schulze 40.161wk, 32.200WK, 40.334wk. These are top end German made units with datalogging. They are pricey but worth the money in my opionion, they are also rebuildable where most others are not.
MGM Com Pro TMM 14063-3, 25063-3 or 40063-3. Another very high quality esc with data logging. Again they are pricey, but worth the money.
Etti HV 220A I have no experience here.

Tyler

[gyrotron]

Guys,

I'm on a budget now but I found this motor that fits the bill and I believe the application too. I want to build the boat in such a way that I can upgrade later without having to also upgrade motor mounts, water cooling jackets, ESC etc. The motor I found is the Turnigy Aquacraft T20 3T 730KV/1280KV which I believe is a knock off of the Proteus X524 Brushless motor with these specs:

Proteus X524 - 2 Turn 600kv in the Y(wye) configuration, 1050kv in the D(delta) configuration.
AquaStar T20 3T - 730kv in the Y(wye) configuration = 21,608 rpm, 1280kv in the D(delta) configuration = 37,888rpm both configurations on 8s count.

Let me know what you think. The Turnigy ($92.62 at HK) is what I can afford at this point. Here are the specs:


Thx

[RaceMechaniX]

It wil be marginal for that size of boat, but given the lower speed expectations it may be fine.

[iamandrew]

the HK motor is still a 56size motor, it should be fine, because your NOT Going to probably get anything bigger or more powerful unless you wanna spend $400 or more on a motor

[gyrotron]

the HK motor is still a 56size motor, it should be fine, because your NOT Going to probably get anything bigger or more powerful unless you wanna spend $400 or more on a motor

Guys,

I am planning on using a Seaking 180A v3 that I already have with this motor. The max current according to the AquaStar specs are 120A @ "Y" 730Kv/ 229A @ delta 1280kv and max watts 5280w. Will this ESC survive if going "Y" configuration; more torque less amp draw? I know I cannot go above 6S with this ESC. Also what is the main diference between the Castle Hydra ICE 240A and the Castle Hydra ICE2 200A HV?

Thx

[Fluid]

the HK motor is still a 56size motor, it should be fine, because your NOT Going to probably get anything bigger or more powerful unless you wanna spend $400 or more on a motor

The problem is not the motor size, it is its quality. Quality translates into efficiency and power...and reliability. Castle 2028 motors are sold used for under $320 regularly - a proven, powerful quality motor which works great on 8S or 10S. But if the OP is on a budget which proscribes spending more than $100 on a large motor, the HK offering is about it.

I am planning on using a Seaking 180A v3 that I already have with this motor.

As Tyler stated, running 6S with that boat is likely to be a problem. Forget what the "max current" says, that is NOT the maximum current the motor will draw - it is the maximum it can draw before it cooks. You can prop that motor to pull 300 amps easily......

Really, you are going about this the wrong way. Your first FE boat should not be a big one - you will make mistakes which will be costly. Better to put the DaVette hull on the shelf for a few months and buy a used Revolt to learn about FE. Mistakes with that boat will cost less, and when you are familiar with FE then you can sell it and start on the DaVette. Based on watching handfuls of gas guys transition to FE, that is your best option.




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[iamandrew]

The problem is not the motor size, it is its quality. Quality translates into efficiency and power...and reliability. Castle 2028 motors are sold used for under $320 regularly - a proven, powerful quality motor which works great on 8S or 10S. But if the OP is on a budget which proscribes spending more than $100 on a large motor, the HK offering is about it.

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ID have to completely disagree,
Ive been researching motors for a while, and id have to say ive found more reports of people blowing up castle motors than any HK or Leopard Motor.
the hull is a 42 in Hull, not some 55in hull. Its not going to draw 200 amps
Any 56 Can would be fine, and only $100 + 10 for a cooling can.

A T180 will work providing its got enough cooling.

300 amps? youve got to be kidding

he said speeds of like 40 mph, his setup will be fine for that.

you shouldn't try and advise people to go out and spend a Billion $$$ on stuff they dont need. its only going to push even more people away from the hobby when they accidentaly blow up their 300$$ Motor, and they didn't need to spend that much in the first place

[gyrotron]

The problem is not the motor size, it is its quality. Quality translates into efficiency and power...and reliability. Castle 2028 motors are sold used for under $320 regularly - a proven, powerful quality motor which works great on 8S or 10S. But if the OP is on a budget which proscribes spending more than $100 on a large motor, the HK offering is about it.

As Tyler stated, running 6S with that boat is likely to be a problem. Forget what the "max current" says, that is NOT the maximum current the motor will draw - it is the maximum it can draw before it cooks. You can prop that motor to pull 300 amps easily......

Really, you are going about this the wrong way. Your first FE boat should not be a big one - you will make mistakes which will be costly. Better to put the DaVette hull on the shelf for a few months and buy a used Revolt to learn about FE. Mistakes with that boat will cost less, and when you are familiar with FE then you can sell it and start on the DaVette. Based on watching handfuls of gas guys transition to FE, that is your best option.




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Fluid,

I appreciate your concern but I am moving forward with this project. I already own two RTR FE boats; the AQ Revolt30 and PB Blackjack 29 and I am pretty familiar with the basics of setting up hardware, maintenance and electronics for this size of boats.

I just fell in love with this legendary 42" Davette design of the 90's and decided to go for it. So I contacted Dana Wilson the original designer and decided to start this project. I have already selected and bought all the hardware and hull ($500 already invested). So the objective here is not to build a racing boat at first but a sport boat that I can later turn into racing. So with this in mind I am interested in learning how to setup a 42" boat on a budget.

If the AquaStar motor and Seaking 180A ESC will let me jumpstart the boat and run it at +- 40mph without burning it, that is what I am looking for at this point.

Dana Wilson (DaVette Boats), who is the hull designer in the first place is working with me on the interior layout of the components and hardware fitting. He is a 58 years old Gent very motivated on seeying his 12 year old design going FE so we are all excited with this project and want to continue until we finish it.

I keep welcoming your help and comments!

[gyrotron]

Iamandrew,

I appreciate your support on this project, your words of wisdom and motivation. I will continue with it until the boat is finished. Take it easy with Fluid, lets work together!

Now, is the SeaKing 180A ok for starters or should I invest on a Castle Hydra and if so which one? 200A or HV 240A. I believe the 200 does not have a BEC and the 240 does but with the 240 I can only go as far as 8S. Please advice.

Thx

[jamie]

hey mate
just a suggestion this will get u doing a bout 40-50mph

http://shop.rcboatbitz.com.au/index.php?main_page=product_info&cPath=64&products_id=1013