The M-Jet 35 development has been finished! Buy the files here and make your boat fly: www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats
Great job Stepan, it is amazing how well the 'half bladed' impellers perform. You might try mounting them on the shaft, then all on a prop balancer adjust them for best balance? They may not be symmetrical when balanced, but it wouldn't matter. Keep up the good work!
Thanks! I already ordered new ones with improved design and I am hoping to solve the balance completely, we will see! I just have to wait 14 days for them again
more Wonderful stuff :) very well done Stepan, a thicker shaft might cut the vibration down a bit, the 6mm I'm using still has some movement in it with all things balanced, smashing job mate, have a great day :)
@@mjetdevelopment or maybe you can also try to design a more efficient 3 blade pump with a total blade area roughly equal to your current 1 blade design? I wonder if it is feasible.
Thats watercooling! It takes small part of the water in the pressurized nozzle and goes through the pipes to cool the motor and esc, then goes out. I design it pointing upward to always see if it is working properly.
You probably have measured it, but do you know how much power this consumes at half and full throttle? Ive got a project in mind and i'd like to know if i can borrow some of your ideas🤔
Yeah I measure it all the time, this is leopard 3665 1050kv on 6s, 120A esc and it consumes close to 80 amps. I dont know how it is at half throttle but maybe around 30A. Which project, I am curious:D?
Wow, your multi-pipe nozzle makes the swimming pool too small! Amazing the efficiency you get with single bladed impellers. You ordered binder jetting steel impellers. It is much more affordable, however the inevitable shrinking is not uniform nor predictable. What I do is order a piece, measure it and alter the design specific for printing.
Thanks! The impellers in this video are stainless steel 316L metal filament. So not binder jetting - I wanted to avoid binder jetting exactly because of that shrinkage. But this metal filament shrinked as well - shaft hole from 5.2 to 4.7mm. And weirdly, the second impeller length increased from 37 (designed) to 37.6mm. Right now I changed the design to compensate for this, and also changed the mounting so that I can drill the holes to H8 tolerance easily. I will have to wait for them another 14 days..
i was thinking if you arealready 3d printing metal why not remove the shaft and insted integrate it in to the impeller and make use of the space towards the center of the impellers, granted im not sure if that would be benificial or worse but it should be less moving parts and easier to balance in theory
Yeah I also had this idea when going to stainless steel. Mechanically, it would definitely be better, no play and less parts, but it would have important disadvantages: 1) the 3D printed shaft surface would not be smooth enough for the rotary shaft seal 2) lower shaft accuracy than with a simple smooth 5mm shaft 3) the second impeller would have to be removeable anyway because the first stage vanes need to go between the impellers:)
@@mjetdevelopment i think the surface finish could be fixed with some light machining but that does negate the point of 3d printing, the point about the removable second impeller is the hardest to overcome, if the second stage dident need vanes then it would be an easy fix but i assume they add a significant amount of performance since you keep them. when you are ready to sell these id like to buy one, im loving the mjet 30 in my big boat but it needs more power, and the mjet sprint is perfect
@@peterwibe2654 I also tested the pump with no first stage vanes (no vanes between impellers) and the priming got much worse, to pretty much single stage pump level. So to get the two stage advantage, vanes are definitely necessary. And thanks for your kind words:)
Sorry, im new to the channel, but perhaps casting the blades would be a better option? also perhaps a magneting bearing separating the two propelers so the water flow does not induce more vibration? it could just be a magnetig ring ourtide, in the shell and a inner oposite pole in the middle, so there is no contact, but the magnetic force keep it centered?
Thanks for sharing your ideas! I considered casting the impellers from aluminum using lost PLA method, but I have no furnace, and the results would probably be worse quality than this anyway. Also aluminum is only about half as strong as this material, and the price where I order them is not too bad. I am not sure how you mean a magnetic bearing though. The impeller driveshaft is firmly supported by ball bearings on both ends. A magnetic bearing would be very difficult to implement into this design and the unbalanced impellers would still vibrate..
@@gaevsprivs I am trying to balance the impellers as they are, just with their shape, without any additional balancing elements. I have already ordered a new pair of impellers with an improved design. The CG of each impeller should be perfectly in the center with the new version, and at the same time both blades are on the opposite side, in theory not requiring any further balancing. I will hopefuly get them in 14 days and test if it works!
Hi, this is a much more powerful pump than the one in M-Jet Sprint and is meant for a bigger boat (around 50cm) which I will build after finishing this, the M-Jet 35 development.
@@mjetdevelopment another thing I'm building the m-jet and using a 1500mah 3s and a 2216 2300kv brushless motor and a 50a ESC will that be quickesh or slow as
@@motorworksproductions153 Thats a really small motor for the boat but if thats your goal, I wish you good luck with an interesting build! So far I am not planning to change the pump in the M-Jet Sprint simply because I would probably have to redesign the whole boat because of it. Currently my plan is to finish the M-Jet 35 development and build a boat for it. I am hoping to make progress even though my time is very limited by my studies;)
The M-Jet 35 development has been finished! Buy the files here and make your boat fly:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats
I wish my grandpa would have lived longer so he could see how bright is the future ahead of us in RC boats development, awesome👍
Very good results for a single-blade impeller! Looking forward to seeing more.
absolute mad lad. great job,this really is the Apex of 3d printed RC jet drives.
Great job Stepan, it is amazing how well the 'half bladed' impellers perform. You might try mounting them on the shaft, then all on a prop balancer adjust them for best balance? They may not be symmetrical when balanced, but it wouldn't matter. Keep up the good work!
Thanks! I already ordered new ones with improved design and I am hoping to solve the balance completely, we will see! I just have to wait 14 days for them again
Wow! That is Powerful
more Wonderful stuff :) very well done Stepan, a thicker shaft might cut the vibration down a bit, the 6mm I'm using
still has some movement in it with all things balanced, smashing job mate,
have a great day :)
Very good tip, I will consider it, thanks!
@@mjetdevelopment or maybe you can also try to design a more efficient 3 blade pump with a total blade area roughly equal to your current 1 blade design? I wonder if it is feasible.
This may seem a dumb question, but what is the purpose of the upward-pointing spout I see on jetskis and also these tiny designs?
Thats watercooling! It takes small part of the water in the pressurized nozzle and goes through the pipes to cool the motor and esc, then goes out. I design it pointing upward to always see if it is working properly.
You probably have measured it, but do you know how much power this consumes at half and full throttle?
Ive got a project in mind and i'd like to know if i can borrow some of your ideas🤔
Yeah I measure it all the time, this is leopard 3665 1050kv on 6s, 120A esc and it consumes close to 80 amps. I dont know how it is at half throttle but maybe around 30A. Which project, I am curious:D?
Wow, your multi-pipe nozzle makes the swimming pool too small!
Amazing the efficiency you get with single bladed impellers. You ordered binder jetting steel impellers. It is much more affordable, however the inevitable shrinking is not uniform nor predictable. What I do is order a piece, measure it and alter the design specific for printing.
Thanks! The impellers in this video are stainless steel 316L metal filament. So not binder jetting - I wanted to avoid binder jetting exactly because of that shrinkage. But this metal filament shrinked as well - shaft hole from 5.2 to 4.7mm. And weirdly, the second impeller length increased from 37 (designed) to 37.6mm. Right now I changed the design to compensate for this, and also changed the mounting so that I can drill the holes to H8 tolerance easily. I will have to wait for them another 14 days..
@@mjetdevelopment what is the price difference with binder jetting? Where did you order?
@@michielstuip3547 This: www.sculpteo.com/en/materials/fdm-material/ultrafuse-stainless-steel-316l/
It was about 3$ cheaper than binder jetting
If he keeps shooting it out of the pool it's gonna be empty in about 5 mins worth of test runs! Lol 😆
i was thinking if you arealready 3d printing metal why not remove the shaft and insted integrate it in to the impeller and make use of the space towards the center of the impellers, granted im not sure if that would be benificial or worse but it should be less moving parts and easier to balance in theory
Yeah I also had this idea when going to stainless steel. Mechanically, it would definitely be better, no play and less parts, but it would have important disadvantages: 1) the 3D printed shaft surface would not be smooth enough for the rotary shaft seal 2) lower shaft accuracy than with a simple smooth 5mm shaft 3) the second impeller would have to be removeable anyway because the first stage vanes need to go between the impellers:)
@@mjetdevelopment i think the surface finish could be fixed with some light machining but that does negate the point of 3d printing, the point about the removable second impeller is the hardest to overcome, if the second stage dident need vanes then it would be an easy fix but i assume they add a significant amount of performance since you keep them. when you are ready to sell these id like to buy one, im loving the mjet 30 in my big boat but it needs more power, and the mjet sprint is perfect
@@peterwibe2654 I also tested the pump with no first stage vanes (no vanes between impellers) and the priming got much worse, to pretty much single stage pump level. So to get the two stage advantage, vanes are definitely necessary. And thanks for your kind words:)
Sorry, im new to the channel, but perhaps casting the blades would be a better option? also perhaps a magneting bearing separating the two propelers so the water flow does not induce more vibration? it could just be a magnetig ring ourtide, in the shell and a inner oposite pole in the middle, so there is no contact, but the magnetic force keep it centered?
Thanks for sharing your ideas! I considered casting the impellers from aluminum using lost PLA method, but I have no furnace, and the results would probably be worse quality than this anyway. Also aluminum is only about half as strong as this material, and the price where I order them is not too bad.
I am not sure how you mean a magnetic bearing though. The impeller driveshaft is firmly supported by ball bearings on both ends. A magnetic bearing would be very difficult to implement into this design and the unbalanced impellers would still vibrate..
@@mjetdevelopment Then the only idea i have is counterweight on the propelers, something that you can easily screw there?
@@gaevsprivs I am trying to balance the impellers as they are, just with their shape, without any additional balancing elements. I have already ordered a new pair of impellers with an improved design. The CG of each impeller should be perfectly in the center with the new version, and at the same time both blades are on the opposite side, in theory not requiring any further balancing. I will hopefuly get them in 14 days and test if it works!
@@mjetdevelopment I love this project, so i hope all works!, Please keep postin videos 😁
@@gaevsprivs I will, I love it as well:D
Will you ever design this jet into the m-jet rc boat or is it to big / powerful
Hi, this is a much more powerful pump than the one in M-Jet Sprint and is meant for a bigger boat (around 50cm) which I will build after finishing this, the M-Jet 35 development.
@@mjetdevelopment cool thanks 👍👍
@@mjetdevelopment could you make a smaller one of these and put it in the m-jet or na. thanks
@@mjetdevelopment another thing I'm building the m-jet and using a 1500mah 3s and a 2216 2300kv brushless motor and a 50a ESC will that be quickesh or slow as
@@motorworksproductions153 Thats a really small motor for the boat but if thats your goal, I wish you good luck with an interesting build! So far I am not planning to change the pump in the M-Jet Sprint simply because I would probably have to redesign the whole boat because of it. Currently my plan is to finish the M-Jet 35 development and build a boat for it. I am hoping to make progress even though my time is very limited by my studies;)