Catamaran Hull Type Power Calculations and more

[BlueBell]

I believe, Abdul, you would be better off "scooping up" the collected debris and dumping it by a conveyor belt type of arrangement into a hold (compartment in the hull).
This would eliminate the drag of the net and debris combined.
It could be self draining to further lighten the load thereby further reducing drag.
I hope that helps.

 

[bajansailor]

Some neat ideas here.
Fighting marine debris: the dustcarts of the sea https://www.lowtechmagazine.com/2009/06/fighting-marine-debris-the-dustcarts-of-the-sea.html

The photo below is in the link above, and illustrates well Bluebell's suggestion above re a conveyor belt system, but on a model scale.

 

[BlueBell]

Thank you Bajansailor.
It could be even more simplistic than that in order to conserve precious battery power.
Solar panels could be employed.

 

[kerosene]

well let me ask this then if you don't mind sir, i've upgraded the battery choice to a 6200mAh 6s with a C rating of 40, and i calculated the full load current of my motor which was 13.19 Amps and from there i would like to ask if usage of this battery is going to be efficient since i am only going to use around 1.5 percent of the motor full speed
full speed was found by using : V = 2*pi*r ( r is the radius of the propeller which is 0.045 m )* N / 60 ( N is the rpm which accordingly i was able to chose the motor 28000 rpm)
and the desired speed is only 1.5% of that hence the usage of the motor is only going to be 1.5% of it's full power. and from that the power consumption is also lowered simultaneously

didn't read whole thread. my recommendations:

- read nature of boats by gerr
- read a few electric kayak threads or similar.
- use a trolling motor (400-500W electrical draw). they are designed for pulling hard at low speeds. Customize tube lengths etc. as needed.
-use lifepo4 batteries, as much as your hull can handle. 1C is typical and probably good for you. they can take 90%+ discharge these days with 2000 cycles.
-make boat as large as possible. 1m is tiny.
-hull drag is rather meaningless here as the drag from the net is very large in comparison. make a makeshift approximate version of the net, fill with junk and tow with a rowboat using a scale measure the drag.

My angry grandpa mode:
if this is a university project you should be able to figure out - on your own - basic math like batteries needed for certain power draw (or convert meters to feet) and not only watch a few youtube videos.

what are you studying?


Ps. the concept is not very feasible in anything but a studying exercise.

 

[fredrosse]

The data and equations I presented are correct for a displacement speed hull, without towing a net full of debris. The youtube video you used to determine power and voltage and battery and RPM is for very high speed planing RC boats, not the type of boat you are considering. The debris net may double or triple the required power, but still very far below the large wattage you got from youtube.

A $100 12VDC trolling motor would probably be ideal for your project, as suggested by kerosene.

Good luck