Jet boats are all about action reaction. Water doesn't compress like air does so a smaller nozzle will always be a decrease in water flow. The amount of water volume/weight is what moves the boat.

Great video! 👍Perfect camera work, a very nice RC Ship, Waves and a great location! 👏 🙏👏

I got my Jetstream yesterday. I ran it in my pool just for a test and I was impressed at how maneuverable it is. Had no problems running it fast in the confined area. I was amazed that the boat actually goes in reverse without using the reverse bucket. None of the other jet boats I've owned was able to do that. The designers left the reverse function to clear debris that get stuck around the impeller, but it does indeed go in reverse making the bucket unnecessary. I was studying the transom last night and I thought I may actually remove the trim tabs altogether and make a custom plate under the nozzle that's longer to act as a ride plate similar to the Streamline Thrasher. I also have a Flycolor 150 that I'm going to install just for the heck of it. Sundogs makes 3D printed nozzles for the Jet Jam and River Jet that really do increase speed, so it's only a mater of time before we see options for the Jetstream. Fun video, thanks.

Can’t get enough of this type of video Big B. From what I understand of jet boats, the intake inner housing, before the impeller, can be a place for improvement. However ProBoat probably has it down pat . So It needs to be full of water at all times providing a little more water than the impeller can move. Although too much extra space can cause cavitation, too much air mixture creates less dense water to be pushed out the back. So I have no clue as to what that rc boats intake cavity looks like but I imagine a near straight pipe would be desirable like the “through hull” water pickups. I saw a video of a full scale jet pump inner housing having a plate welded to the forward most portion to close of unneeded space, the drive shaft passed through it and this allowed for a more stream line intake and had a noticeable improvement on the boats high end speed. 🤷🏻 what do I know, accept that out of the box is never fast enough 🤣😂🤣 Tinker tune and test 👍 BGFL

Don’t give up on the nozzle, with water jets very slight improvements can be made but slight at best (that is what I’ve gleaned from the internet) however Big B you may prove them wrong!!! Tinker tune and test 👍 BGFL. That is one cool boat.

Very impressive video. New Subscriber. Happy trails! o7

I got mine out today. Made some small videos of it. No trimming done really. Just wanted to test it. It did 29 mph which wasn't bad. And there's definitely a few more left on the table.

Think it might be better if you make the hole bigger than stock so higher flow rate

More kv would be easiest way to go faster. Cool stuff big B

How about using the trim tabs to keep it from purposing and trim the nozzle up. It might be worth a try. Also is there anything you can port off of the inside of the jet pump for better flow.

Maybe time to rename Blake as Jesse James Big B?! Perhaps fashion him a little western hat? Always appreciate your will to experiment and get those big numbers. 👏

Big B look into loader grate for jet pump. Little piece of metal in the intake grate on the bottom that directs water towards the impeller. It will load more water to the impeller

When do you make a cat with 2 of those impellers ? 😜

I think I might know the 'problem'. You placed your jet nozzle extension inside, which is restricting flow, creating a slight back-pressure, while simultaneously increasing the jet stream pressure, but also condensing that stream into a smaller stream. There are a few (maybe more) videos about the TFL Jet Boat, and nozzle mods people have done. You might want to search some of them out, and watch them. You'll notice that, in almost all extensions done by others, they've either added the extension to the outside of the stock nozzle, or (as I'm in the process of doing) they've added the extension directly to the end of the stock nozzle (which, when done correctly, has an ID matching, as closely as possible, the stock nozzle ID).

The steering nozzle isnt what id change in diameter. The part of the pump behind that is what would need adjusted. Thats what the water pushes through. And its pretty thin there so i feel that part would need 3d printed and made different sizes. Im picking a printer up this winter.

Hey I'm looking to do a 6s upgrade on my Jetstream - Having a look at one of those Flycolor 150Amp esc's to do it. I see you run them in a few other boats and so I was curious if you thought it would be a good upgrade for a Jetstream? 3s is a bit of a snooze - 4s is o.k. - but I got some 6s basher batteries from an Arrma I'd love to get in this thing! ;)

You should use a flysky gt5 and hook the trim up to channel 5 or 6 so you can adjust the trim on the fly

Whacky is good. Invent things and make stuff……. 👍

What is the difference between adjusting the trim tabs and adjusting the nozzle up and down? Both do the same thing?

I would lengthen your adapter but keep the hole the same size & wrap your adapter around your nozel ..

Can you mod this thing for 8s??

Nozzle Schmalsle she’s wants a more aggressive impeller and a loading intake grate .good luck

Question is…. What’s better this jet boat or the Thrasher?

Try opening up the inlet for the water to have more volume displacement

what is the diameter of the impeller?

I feel any nozzle you add will slow it down. Anything you insert into the outlet is a restriction.

dude i'm excited for the spinning pressure washer nozzle lol

Physics: It's not just a good idea, it's the Law. Bernoulli, Boyle, Pascal... they'd all have some opinions on this matter.

Already took off the reverse mechanism.

FASTEST JET BOAT I HAVE EVER SEEN . I THINK IF YOU REMOVE THE TRIM PADS THEN MORE EXPELED JET WATER WILL BE DIRECTLY HITTING THE POND WATER .NO - + BATTEL. YOU HAVE GATORS WE HAVE MUSKIE. 5 FOOT MUSKIE JUST GRABED A GIRL BY THE LEG RIPPED HER OPEN BAD. THE TEETH ARE LIKE RAZORS. NOT AS BAD AS A GATOR BUT THEY FEED ON WATER BIRDS. DUCKS AND GEES. AND RC BOATS.