The boat you designed is called an outrigger. We used to race them all the time. The key is having a “turn fin” on the inside edge of the sponson closest to the center of the course. It acts like a pivot that the boat turns around. Some folks put a hook on the bottom to plant the sponsor more under hard turning.

Wow! This took me back about 25 years, where as a kid I built a couple of RC boats that looked exactly like one you've made. Litterally the same! It was a lot slower though... back then I only had access to DC motors. Brushless 3 phase motors and LipO batteries had yet to really enter the RC world. Very nostalgic video, thanks!

It would seem that slow and steady won the race! Great build as always!

Fair play for taking the L, good show.

Whenever I watch these videos, I get so jealous of this place you live. It's freaking gorgeous. You have trees and access to a beautiful lake. Man you are totally living the dream.

I have been following the channel for a long time. Every project deserves respect. Always interesting to see! Well done ! Greetings from Belarus ! ) Давно наблюдаю за каналом. Каждый проект заслуживает уважения. Всегда интересно посмотреьт ! Молодец ! Привет из Беларуси ! )

Awesome video! This really makes me want to get into model building, boats.. planes.. anything with propellers xD

Sweet! It's great that the boat can withstand a crash or too. The motor shaft snapping makes sense considering how fast it was rotating when the blades hit the water.

Hi Simon. Your hydroplane is a beautiful build and fast as a rocket, awsome job 👍👊

Always a joy to see a new creation and video from you. The quality and editing are many notches above others in this genre.

The use of modern build technology shown here is really something. Thank you .

Thank you for not making this a two part video! Great job with the boat, and a respectable L. Definitely had them beat in the speed department!

Drifting hydroplane is something cool I did not expect to see. It's awesome!

You got some really awesome footage of your boat from the surfboard. Seeing the boat miraculously turn right, away from shore with no steering like a perfectly trimmed free flight model plane. Super Cool!!! it's a win for all. good stuff.

Just a thought - you used a LOT of expanding foam there. Once you spray it in, it will expand considerably eventually forming large bubbles if there is little to constrain it, giving a very light result. If you spray a LOT in, the bubbles will be constrained and smaller, but there will be weight (mass) from more foam (and less gas bubble volume) To achieve the lightest result, you need to gauge just how little you need to spray in so it's mianly bubbles with minimal mass from the foam material itself. For small voids like yours, a surprisingly small amount of foam needs to be injected. One tip is to leave 10 or 15 seconds between squits into the same cavity - to allow the first squirt to expand out without beings constrained by nearby squirts. A seconds tip is do it on a warm day or in a warm room, and gently warm the spray can to 30C first (shaking often) in a bowl of warm water before you start. This makes the foam expand much more. Make sure the fuselage/hull components are at 30C too. If you know beforehand (at the design stage) that you will fill your cavities with foam, design them to be relatively free of obstructions so the foam will expand and flow well. However, for maximum strength, you may wish to deliberately introduce spars for rigidity though then you need to drill more holes and inject small amounts at more positions to ensure good foam filling. Also be careful with comples internal spars if weight and balance is vitally important - for aircraft for example. If the foam does not flow evenly into all parts it will affect the balance being lighter is areas that the foam does not reach or where it is less dense. I foam. A lot. It's not always easy haha.

This was way cooler than i thought it'd be

If you add fins to each pontoon it will have a pivot point for the turning and will reduce the slip in turns. Great video!

Here from Lake Washington, home of the iconic hydroplane races of Seattle, I might make one suggestion to your speedy craft. If you want the boat to carry more weight (ie a camera mount near the center of gravity) you might try covering your carbon tubes with an aerodynamic wing to give the hull more lift. This is how the unlimited class hydros carry their big turbines.

Blown away that the crash didn't destroy the boat... nice one!

Great Job. These things are quite hard to get just right with cg and everything!

Timothy Pastore's comment hit the nail on the head. The turn fin is key to making it bite on a turn. Mine is made from a blade cut down from a small kitchen knife. It is placed a bit ahead of the physical CG of the boat. I can turn at full throttle and it is perfect. You will not need an air rudder. I also mounted it with a bolt so if it where to hit a solid object it will swing back preventing the sponson from having the transom ripped out of it. As for getting it on the plane, I will hold my boat at the front from the side with the nose tilted up slightly. In other words my arm is extended away from my body to hold the nose, I am standing broadside to the hull. If you stand rearward you risk getting chopped by the prop. Rev the prop to about 30-40% throttle a gentle push and swing your arm out of the way. It is on the plane instantly. Hand to transmitter, then adjust your speed to suit. I have had it work every time, just took a bit of practice to get the right technique. Loved the video BTW, thanks for sharing.

Wooosh that's fast. Looks cool too. I love the air/water rudder. Id love to see it go over a water ramp and get some air!

Outstanding! Good times had by all 🙂

Nice Build, this is how people learn! Thanks for sharing.

I found this KZfaq channel a while ago and your videos really impressed me. Great regards from Germany

What fun life you have creating these kind of vehicles. And handy to have this lake near-by, winter,summer, its all good

I love that powered surfboard!!

Serious editing and lots of content. No waiting till the end to get nice info. Great video

The language sounds melodic! Slow and steady can win the race!

Perfect design to have some extendo wings! Go-go gadget!

Nice upgrade to the rudder! That RC boat is super fast! Thanks for the video share!

the hydroplaner looks very cool simple enough and fast. good job

Very fun toys there, Simon. Good job on that.

Excellent video. Very impressive boat and an entertaining lunch break.

slow and steady wins the race!

Love Simon's playground ... 👍

Yes! A new video.

Love to see you uploaded a new video! I’m sure it will be great! 👍

Impressive! How did you choose the shape and dimensions of the hull? Could you give more details into this please? What to do next: make it able to take a ramp and jump, go even faster and with a camera onboard!

You sir.. are a true engineer..

Amazing work!

One of the very few channels I literally stop everything to go watch.

Slow and steady wins the race

Perfect model!

What a beautiful lake!

This is really SOMETHING, Simon!

Thanks!

Well done.

That’s awesome , great job . Insanely fast.

I enjoyed watching you solve the problems as they came up. A fun video.

Häftigaste bygget! Vilken speed! Grym video

Scary fast boat. But that surf board is still by far the coolest thing I've ever seen!

Regarding expanding insulation foam: If you use the "Door & Window" one it doesn't exert as large an expanding force as other foams.

Awesome project and insane speed 🔥 Love it! To increase steering efficiency you could add tiny vertical fins to side hulls inner wall low end. They would be in water to add side force and reduce front end sideslip.

Nice collaboration 👍🏻

That was excellent, Jolly Good Show!

The drag from the motor support is huge. Square edges everywhere.

you may not have won the boat race, you certainly won most awsome hydroplane speed built. This is so amazing!

Great camerawork! You captured the feeling of speed perfectly.

Solid engineering!

That boat is insane!!!

It looks beautiful there

Happy to see someone else using my design, It would mean a lot if you could share the link and the love!

Good job Simon!

such a beautiful story

This was fun! Next build: Airboat, or any type of airplane that can land on water.

Unique project as always.. A+ for cinematography and scenary

Love your content bro 👍🏼

I would like to see a ground effects vehicle. That would be quite a challenge but I have confidence in you!

I think what you should have done IMO is differential steering. In other words, have servos turn the propellers themselves, no rudder. That would make the boat extremely fast AND allow for immediate, rapid steering. I've done this design before and it works really well.

I built and operated just about everything radio control. Old and broke now. Never finished my last project. A boat design very similar to this. I found a masters thiesis on the design and function of a neutral lift highspeed . I believe you can set a world speed record with this sponson !

this was really fun more pls

Great work, really cool hydroplaning boat!

Great for going straight but to turn better round the bottom of each pontoon front 👍

I immensely enjoy this channel

Good job. Great evolution in your design that resulted in a very fast boat.

DOH hitting a stationary object. Nice build 2x👍

This moment 7:20 is the best moment all your videos could be you doing this.

Slow n steady wins the race 😁

WELL DONE

You are the best. I wish you could do this full time :)

that looks like a fun time and good friendly competition.

That was amazingly fast 💨

I enjoy this channel immensely

Impressive work, I really like how you show your experimentations with different designs. From the perspective of a physicist that only have experience designing vehicles in KSP it looks like your thrustvector is ofsetted from the center of gravity such that the force from the engines would press the nose down in to the water (and thus increase the friction). Maybe you could get to even higher speeds by lowering the engines closer to the central line? Could at least be worth trying.

That was one hell of a ripper you made!

Two motors like the center one with proportional thrust would work for speed and steering. Space them on the outside mounts.

totally awesome. loved it!

Your videos are always so high quality ....love it

This looks so fun!

I'd love to see more videos like this

My favorite mad scientist!

Nice🌟🌟🌟🌟🌟 At one point I thought I heard this ancient Swedish violin with played keys.

Awesome boat!

It's always a pleasure see your creations! 🔥

Someone send this man an fpv set!! That would be epic!!

What an epic transition. We see you building a hydroplane and testing on the grass. Next we see trials you conduct with varied responses. I knew when you added a rudder, you were going in the wrong direction. The drag and principles of physics on the hull changed. A purist hydroplane which has been used in the swampland of Florida is a tried and true form of transportation. When we see the next part of your video, you are surfing on an electric surfboard playing in the water with the boat!, !!!!! Epicenas. I am inspired fully today by this. Will get to work now on boat and electric board today. Thank you for the inspiration i needed. Btw, beautiful nature to explore your inventions. Germany? Z

Spray spackle is a perfect idea I can use now.

Nice 😊

Great content dude. Thanks and Blessings.