200% SB90 on a Creality Ender 3

This is the building forum for the Combat Boat 90. If you are interested in the STL's for this project, they are available to those who help me by contributing 15 Euro. Then you get access to a sub-forum where STL's, instructions and mods are located.
Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Sat Nov 30, 2019 7:13 pm

I was able to get a water test done today. She needs bigger ESCs. I had 90a ones in there and one decided to pop on me. Looking to go up to 150a.
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Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Mon Dec 02, 2019 5:38 am

Tested the power setup with a Watt meter today. She pulled 100a on 4S with the included impellers. I’m going to be playing with the pitch and blade quantity until I can clean up efficiency and get the amps to hold steady at 80a with 100% throttle. Attached is my first attempt with a 4 blade and rounded leading edges similar to a Solas or Impros Yamaha jet ski impeller.
Attachments
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admin
Site Admin
Posts: 248
Joined: Thu Jan 11, 2018 7:46 pm

Re: 200% SB90 on a Creality Ender 3

Postby admin » Mon Dec 02, 2019 9:46 am

new_impeller.PNG
new_impeller.PNG (140.51 KiB) Viewed 1137 times
Hi! Thanks for sharing your pictures of the test run! I know the impellers are not the best in efficiency as they are drawn to be printable in the original size so I could not make the blades too thin.

I made some updated ones for Matsas big print, here they are attached. In the picture you have the original to the left and the new 3-bladed on the right. Both of the attached ones has improved blade shape and I would suggest you test the three-bladed one. The trailing edge will need a bit of sanding as it's designed to stick with a little bit more surface to the print bed while printing.

They are still in the original size so you need to scale them up.
Attachments
Impeller_3_blade_lower_angle.stl
(935.43 KiB) Downloaded 6 times
Impeller_2_blade.stl
(291.59 KiB) Downloaded 6 times

Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Mon Dec 02, 2019 3:24 pm

admin wrote:
Mon Dec 02, 2019 9:46 am
new_impeller.PNG
Hi! Thanks for sharing your pictures of the test run! I know the impellers are not the best in efficiency as they are drawn to be printable in the original size so I could not make the blades too thin.

I made some updated ones for Matsas big print, here they are attached. In the picture you have the original to the left and the new 3-bladed on the right. Both of the attached ones has improved blade shape and I would suggest you test the three-bladed one. The trailing edge will need a bit of sanding as it's designed to stick with a little bit more surface to the print bed while printing.

They are still in the original size so you need to scale them up.
Thank you for sharing those. Would it be possible to get them as a .step file. I have to modify them so the drove dog I have works.

This model is amazing and thanks again for sharing it with all of us.

Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Tue Dec 03, 2019 4:51 am

The impeller to the left is the original and the one to the right is a lesser pitch and thinner blades I designed. It still needs to be cleaned up but I am curious on the amp draw with the new impeller.
Attachments
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Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Sat Dec 07, 2019 1:54 am

Alright everyone since these pumps weren’t intended to be this scale I made some changes. I made the stator/veins and wear ring two pieces than can be disassembled. I added 3 additional veins to help reduce the spin on the water as it exits the nozzle. I’ve also made the nozzle smaller.
Last edited by Kylecox1019 on Sat Dec 07, 2019 1:56 am, edited 1 time in total.

Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Sat Dec 07, 2019 1:55 am

Alright everyone since these pumps weren’t intended to be this scale I made some changes. I made the stator/veins and wear ring two pieces than can be disassembled. I added 3 additional veins to help reduce the spin on the water as it exits the nozzle. I’ve also made the nozzle smaller.
Attachments
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admin
Site Admin
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Joined: Thu Jan 11, 2018 7:46 pm

Re: 200% SB90 on a Creality Ender 3

Postby admin » Sat Dec 07, 2019 7:53 am

Are you skipping the reversing buckets?

Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Sat Dec 07, 2019 1:37 pm

admin wrote:
Sat Dec 07, 2019 7:53 am
Are you skipping the reversing buckets?
I’m going to be testing a few different outlet sizes for the pump so I didn’t add the mount yet. I want to find the most efficient setup before I added the reverse buckets.

Kylecox1019
Posts: 34
Joined: Wed May 08, 2019 11:57 pm

Re: 200% SB90 on a Creality Ender 3

Postby Kylecox1019 » Sat Dec 07, 2019 10:25 pm

Tested the new pumps today. Gained almost 8mph or more at 30a less.
Attachments
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