Two Motors on DIY RC Boat 

Idea 2: have a more modern design or add some 30 grams of weight to the front of the boat or add 2 smaller motors that power the main motor

Add hydrofoil wings to the bottom of the hull, so that when the boat lifts up, it will be much more stable and it will allow it to also move with smaller drag in the water when traveling at high speeds

Mechanical engineering student here: shorten the vertical beams that connect the propeller to the power source and that thing that changes the direction the propellers are facing, and make the boat longer. These reduces rotational force from the propellers relative to the boat's centre of volume, and thus reduces the tendency of the stern to rise when the propellers start. Also, every time you do a speed test, try doing the test 3 times for each design and take the average time as result.

Make stable foils for it so it can fly like it wants to, and without a lot of water resistance you can go so much faster

Design the boat like a jet air intake and mount the engines forward. The motors would then have to be fixed in their position and cannot move, but the boat should be faster and more stable in the water. The controls work well with control flaps.

You can either counterbalance the weight to the front or raise the props to raise the angle of thrust. As it sits now it angles up to much because it is up so high. Edit: think of the point where tye mount meats the boat as a pivot point. You basically have a lever and the shorter the lever the less rotational movement you would get. This also means more power to the directional movement because it isnt being used as rotational energy.

Just make it with hydrofoil wings. It will be faster because you'll reduce drag of the water and more stable on high speeds. I'd recommend you to start with U-shape wing first instead of t-shaped, because U-shaped wings don't need to be constantly controlled by computer to be stable and avoid stalling. To add them simply find the centre of gravity (find the spot where front and back balance), then add 2 U-shaped wings with equal effective surface areas of the wings on the equal distance from centre of gravity (not too close). Add some elerons or made the whole surface turnable, so you can turn the boat with it. Also this motors with their mounts are too heavy for a such short and lightweight base. Try to experiment with the layout, maybe make base longer at least, so they won't literally drown the back of it. The most radical but cool thing would be to mount motors in centre and somehow extend the drive to the props. Thanks for good content

Idea: use toroidal propellers, they spin round and because every two blades there is a outer wall that extra water isn’t wasted as centrifugal force and has to go out as force Edit: also for a bit extra speed and efficiency make a wing beneath the boat that creates lift making the boat go up, this decreases contact with water and in turn causes it to raise up to increase speed, beware on the angle of attack though as too high a velocity and it will be a boatplane, just stating some ideas

You see the flaps on top of the motors, they act as hydrofoils. In order to stop it from lifting, you can try to point the flaps at around -5 to -10 degrees. This should make it generate lift downwards and should keep it down. If you want to make sure it goes super fast, i reccomend you to add sharp points at the bottom to allow for hydroplaning. This is much faster than hydrofoils as it pretty much just leaps out of the water, reducing drag significantly and is easier to make compared to a hydrofoil

Trust me on this one: switch to a water buoyancy chassis instead of using a water displacement design

There's a lot of things you can do differently to make your boat go faster. The more weight you put under the water, the more weight you're going to want on the front of the boat. Your design of your boat is slightly off. That's why it wants to launch out of the water.

I honestly think it might be a good idea to extend how long the drag race tests are, to make the difference between test times more clear.

Bounus idea: make the weight even 20 grams in the back 20 grams in the front so it doesn't fly and become an ✈️✈️ and hit a tree and explode Edit: corrected my language

You need more blades on your propeller- it’s more efficient

The way you have those two white fins on the back creates lift, so you have what is essentially a hydrofoil

Have 4 bladed propellers also at the v shave have the bow angled in towards the bottom to help the take off

Put a big part in the front of the boat like on ships, maybe it will make it more stable but it must make it more aerodynamic wich means it might go faster.

You should make the hull smoother and raise the propellers up so it doesn’t fly out of the water and you should move weight to the front t of the boat not to much though you should also put the mini hulls and the side closer down to the water so it doesn’t turn to much

Try adding large dagger board fins in the bottom to help it stay strait

Make sure you put the white more to the front of the boat so it has more friction on the back

Ad weights, use toroidal propellers and the rolling is because the propeller is not horizontal with the watersurface, if it's parallel it wil be mutch easier to control and make the motors fixed to the hull its more stable and you can turn by giving more power to one of the motors sothat it wil turn in the opposite direction

Idea 1:have a more powerful motor ora more light and thin design or just pick both a powerful motor or a lighter more thin design

Idea 2: you’re doing great but you must put 40 Grams on a little bit from te mid

use a differential like in cars and put the steering in the front so it’s easier to steer and you can also put a gyro on so the steeringstay straight in bumpy water

add 2 funnels in the front along the sides 1/3rd of boat's length and them to be in straight line or a bit curved near the back.

Put the motors on the side, so the speed is evenly distributed. You can also put the motors on the front so when you accelerate, the front will basically drag the rest of the boat along and make it more stable (when the boat turns, you might want to lower the sensitivity of the controller). I think the side is better, but they are both okay.

you can add foils or add weight to the bow to keep it down

This would also add enough weight on the front to keep it from standing up

Add more gears to it and add 3 motors for maximum stability and faster also add a sum detail and a modern design and a little more weight to the front

Put a gyro in it, so you can stabilise it by putting more power in one motor than the other, or use a differential like in cars

Idea is to make a program that make the start smother, it basically wait for an input and than when you have it, it just accelerate the boat smoother like a linear function

Faster running speed and acceleration are 2 different things. Considering how powerful this setup is you may want to angle the motors so that the acceleration force points somewhat down. This will push the aft up and help hold the nose down giving you better control. You may also want to add ballast to the bow in order to help cancel the bow lift on acceleration.

You should add a keel to make it go straighter

Try to put them in different configurations, like in line or staggered

Make the center hull a tad wider and drop the pontoons, and a common thing for speed boats is what’s basically flaps on the back of the boat that help with angle of the boat and turning,it’s hard to explain properly but I think they could help with the throttle issue

speed is directly effected by hull length if you make it longer that would help, you could also make it like the race boats and lean into it coming out of the water

Faster boats kind of move on water-skis when they get up to speed. You might want to lean into that. Maybe make the katamaran-pontoon-things go downwards when the boat rises up, keep the thing stable? Like, put in spring things that makes them want to go down. If you don't want the boat to lift out of the water, maybe angle the fin things above the motors upwards instead of downwards, make it push down into the water instead?

Add more back to back propellors in a tube for a replica jet engine

Those guard plates over the motors are actually causing the boat to rise out of the water faster due to the angle and overall weight of the boat. Youl need to cancel out the force by either removing them or using a forward mounted water foil.

Try propellers that stay in place and rudders that move

Switch the props side to side and switch the directions of the motors, doesn't look like the hull is making it jump out of the water, it looks like the props are just climbing straight up in the water until the boat gets some forward momentum

Change the foam wings to plastic and make them wider

To help with small adjustments you could have the props spin at different speeds independently depending on the direction inputted, the directional turning I saw with the servos you might be able to make big and small adjustments effectively

I have an idea why dont you add a small wait on the bottom so is center of mass is more in the water making it more stable

Now split it into 2 thin boats conected together

try moving the motors as close to the body as possible. unless theres a reason they're so deep in the water. i'd also say you can angle the motors down ever so slightly so that it lifts the back and pushes the front down but i doubt that'd actually work

maybe try to shorten the shaft for the props an a v shaped front with a flatter back part should make it more stable

Add more weight to the front, but not too much or else it will nosedive into the water.

If the boat is flying upwards, maybe putting weight near the front of the boat will help keep it balanced. My thinking is of tractors that use weights on either the back or front of the vehicle to offset the weight when handling a heavy load

Bring the motors closer to the surface rather than throwing it all the way down at the bottom, make a more sleek hull design, maybe make the hull a bit longer as well. If the boat keeps shooting high in front, add a bit of weight to the front to keep the nose down just enough. Angle the props to a perfect position to get max speed and less lift.

try making the hull shape a V shape that is a more gentle slope, you could also add a prop shaft coming out the bottom of the boat at an angle to minimise drag

Add more batteries to weigh it down so I can stay in the water and to increase the run time

If the main issue is that the boat slips out of control I think you should try these two solutions 1 adding weight because if the boat is heavier it will probably be easier to control + experiment with where on the boat the weight should be positioned and how much weight to add 2 add a spoiler like in a sport car as it increases downward thrust making it so the boat would jump less, again experiment with the size of the spoiler and the position of it on the boat

You got to make the body heavier But still float

put one propeller in front to cancel out the jumping

Move the weight further forwards. Make sure the ESC and battery is plenty extra since water is heavier than air. The voltage rating is not the limit but merely a suggestion.

Add a wing to the bottom of the boat to stop it lifting up but not restricting forward movement

add hydrofoils to the bottom of the hull. the boat will lift up on them which will reduce drag, also you can attach a rudder under the hydrofoils for improved control

you could make the front and back more hydro dynamic by making it pointy like a u-boar from ww2 (just as a note im now very good with hydrodynamics as aerodynamics)

If you wanted to reduce drag and hopefully roll, you could add stabilizing fins. Even just adding a couple small one in front of the motors, while potentially increasing drag, will drastically increase the stability, both in yaw and roll. The boat would have an easier time going straight and would deal with the torque of the motors easier, and you could lose the drag of the extra pontoons. It’ll take testing to determine viability, but it could help your design

Try making the front one of the boats a little heavy to stop it from launching it up

maybe make the tip of the hull heavier and add a gear ratio so you get more RPM or make it 2 motors power 1 large propeller?

Bring the motors up closer to the bottom of the hull. Placing them so much lower is what’s causing it to push the nose up so hard.

The motor are too low below the center of gravity which makes the front go up.

1. Add more weight 2. If you're powering the motors with DC, add an inductor to the circuit so they start up slower, and it won't jerk as much upon starting the motors.

Step 1:make it streamlined shaped to reduce opposite force of water Step 2:centre of mass physics says that centre should be not too much weight of boat so make light and remember where is its centre of mass

Make the motors closer to the hull and remove those flat pieces above the motors. The flat pieces act as hydro foils (hence the flying). If you want it to fly add wider foils and a foil at the front of the boat

You must make the wings above the propellers adjustable so that they always remain level using a servo motor, or redesign the wings so that they are at an angle parallel to the surface of the water, that is, calculate the degree of inclination of the boat and subtract them from 90 degrees.

My man builds a native philippine boat, as a filipino myself this is fire 🔥🔥🔥🔥

1. The contents are not stable nor balanced. 2. You need ballast. Put something heavy along the center point inside, this will keep the bottom in the water and allow for the force to remain applied properly. Try loose change. Also probably segment the bottom and place more weight toward the front to counter balance all the weight in the back.

You should use 2 motors, but to control the rudder you should use the motors themselves to control the boat, add also weight on the front

Look at an outboard motor. The shaft doesn't stick couple feet into the water. That's why yours is slow and unstable. Shorten the shafts to where the props are just right below the bottom of the boat. U won't need stabilizing fins

Maybe it will help if you attach an underwater wing to the front so that it is always balanced when the front comes up?

add the things at the back of the Arrow to stabilize it

Make the hull bigger and keep motors still, to turn use a rudder thingy

You should move the propellers higher on the hull so it has less leverage to push the front of the boat up and will push the whole boat more forward

Love how everyone who has experience in any one of these things is coming to help 😂 and sending ideas

no no no no you need some hydrofoil wings which make it really fast it just neds some time to get speed

Im new to the channel and im watching many of your vids right now and in one video you said youll try what the comments say so this is gonna sound dumb but make the sticks connected to the pool noodles at a 45 - 60 degree angle which will put the boat higher so theres less water resistance and if it sinks too much put another pool noodle directly on the bottom

For a non hydrofoil approach. Bring the motors up bc that will reduce the chance of the motors bringing the whole thing out of the water

It’s the boat going onto plane because of the force of the engines, if it wants to do that then probably make the hull bigger and make a wider and deeper hull and add a small little weight on the front and make the hull more sharper and more aero dynamics.

you need ballast in the front to keep it from jumping out of the water and to counter-balance the weight of the electronics

Put the propellers higher up, the thrust pushes the hull upwards, causing it to fly.

Make props higher and slightly pitched down, lower centre of gravity and remove floats

Hi! You have to add more weight to the boat because it is very light, this makes it jump before it moves ❤❤

When you add a second propeller and motor you double the torque produced and consequently can increase propeller pitch to increase speed of the boat.

I'm not sure I'm just a dumb kid but if you had hydrofoils and angle in a way wouldn't that produce downforce

Mabey get the center of thrust closer to the center of mass by making the motorshafts shorter looks asome though

The propellors need to be redesigned as sharper, cleaver like props that dont lift as much. Add more pitch and they will go faster

You know the formula of work done Just optimise it done!!!

the boat want to be a plane, i cant feel the boat feeling.

Its unbalanced. Need to put more weight to front to stop it from flying out and actualy focus the propeller power to front not up. Sailor here btw

Propellers closer to the boats belly. Having the props this far down makes them bush the bow up because of leverage

Make the motors a little higher unless you want it to be a hydrofoil, and also make the boat less squarish, this allows the boat to have less drag This way the boat will dominate the seas!

My idea: i think ur right 1 motor at back and put the 2 motors on the sides of the boat and put more weight on the boat on exact weight so it goes in straight line

Now remove the stabilizers, they are just adding weight, as the torque from the opposite moving motors cancels out. Or just redesign them to add more functionality or improve reliability

Try 4 propellers with 2 more motors and add 2 small fins on the side so there would be more control

Motors need to be closer to the hull so it doesn’t torque the bow out of the water and also a keel would help from torquing from left or right

Actually to scale the propellor is now like 2-3 meters underwater. Maybe make the shaft alot shorter. So it doesn't push the boat as hard.

A a little weight to the bow to stop the tilting up which is put the thrust up instead of forward