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3d printed rc boat problem

Old 04-17-2020, 12:56 AM
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Major1997
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Default 3d printed rc boat problem

Hi all I have a boat I 3d printed and threw a old engine in , but I don't know much about boats so I was wondering if I could have some wisdom.
here is a video of what it is doing: vimeo.com/user113047867

youtube.com/watch?v=JCS-BeZl_ng&feature=youtu.be

close up on prop and positioning: youtube.com/watch?v=92Ibi8VHdx0

Better video in daylight: coming soon


any help is appreciated

all i does it shoot water up and doesnt go forward very fast at all

Last edited by Major1997; 04-17-2020 at 07:00 AM.
Old 04-17-2020, 04:49 AM
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Unfortunately, it won't let anyone that isn't a vimeo account holder in to the website
Old 04-17-2020, 04:55 AM
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Major1997
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Originally Posted by Major1997 View Post
Hi all I have a boat I 3d printed and threw a old engine in , but I don't know much about boats so I was wondering if I could have some wisdom.
here is a video of what it is doing: vimeo.com/user113047867


any help is appreciated

YouTube link instead : youtu.be/JCS-BeZl_ng
or youtube.com/watch?v=JCS-BeZl_ng&feature=youtu.be
Old 04-17-2020, 05:16 AM
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Originally Posted by Hydro Junkie View Post
Unfortunately, it won't let anyone that isn't a vimeo account holder in to the website
new link
Old 04-17-2020, 06:48 AM
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Okay, that worked. Was hard to see anything as there isn't a lot of light. What I can see is a lot of splash and very little push. That tells me it's one or more of three things going on:
1) The prop is too high in the water
2) The boat is improperly balanced
3) The prop isn't a good match to the boat
Having a video with more light so we can actually see the boat would be more helpful as it's hard to see how the boat sits in the water or where the prop is in relation to the water. I'm not an expert on vee style hulls but, with more light, I could post the link in another forum and see what the guys think might be the major culprit that is causing your problems
Old 04-17-2020, 06:52 AM
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yea sorry i will post a better video tomorrow.
Old 04-17-2020, 07:58 AM
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Would you mind if I post it on another forum? I'd rather ask than cause a problem later
Old 04-17-2020, 08:38 AM
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Originally Posted by Hydro Junkie View Post
Would you mind if I post it on another forum? I'd rather ask than cause a problem later
I don't mind
Old 04-18-2020, 01:44 AM
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Default Better video

youtu.be/snPb-kyyMB4
Old 04-18-2020, 09:54 AM
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That problem is usually caused by the water flow before it gets to the prop being obstructed. Flowing water does not like to go round corners. If the pro can not get easily flowing water, it has to get it from the sides. When that happens it acts like a paddle, and the easiest direction to throw the water is due up.
Perhaps a fairly close picture of the stern so that the relative positions of the prop and rudder to the transom can be seen?
Old 04-18-2020, 01:00 PM
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Originally Posted by mfr02 View Post
That problem is usually caused by the water flow before it gets to the prop being obstructed. Flowing water does not like to go round corners. If the pro can not get easily flowing water, it has to get it from the sides. When that happens it acts like a paddle, and the easiest direction to throw the water is due up.
Perhaps a fairly close picture of the stern so that the relative positions of the prop and rudder to the transom can be seen?
I had a similar request, a picture of the rear of the boat.
Someone that was watching the video in the other forum thinks the prop is too small and too high so a picture will help answer that for him as well
Old 04-18-2020, 05:42 PM
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Originally Posted by mfr02 View Post
That problem is usually caused by the water flow before it gets to the prop being obstructed. Flowing water does not like to go round corners. If the pro can not get easily flowing water, it has to get it from the sides. When that happens it acts like a paddle, and the easiest direction to throw the water is due up.
Perhaps a fairly close picture of the stern so that the relative positions of the prop and rudder to the transom can be seen?
youtube.com/watch?v=92Ibi8VHdx0
Old 04-18-2020, 08:18 PM
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Okay, we have a first step to fixing your issues, replace the prop with a commercially made BC one.
I didn't see it in the first video I saw but in the one you shot out of the water, I, and another boater, both saw part of the problem. I know you "printed" your prop and that has led to a couple of issues:
1) The blades are so thick they are acting like paddle wheel blades and causing a lot of cavitation
2) The blades don't have enough pitch in them. They are so flat they don't really push.

What I would do is contact Mark Sholund and have him help you out with obtaining a prop more suited to your boat. His website is:
http://www.props4u.com
Old 04-18-2020, 11:50 PM
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What Hydro Junkie said. Thick prop blades with a wide leading edge tend to just throw water out sideways rather than move it along. At the very least, a fine leading edge is needed, but the right grade of plastic will be needed if the prop is to last any length of time. Blades tend to have a curve profile which enhances the movement of water in the intended direction rather than just being a flat plate. The right grade of plastic that will give the fine entry and last well might not be available for printing, there is a reason why metal props are used.
Old 04-18-2020, 11:59 PM
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Major1997
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ive orded these

aliexpress.com/item/32800565114.html?spm=a2g0s.9042311.0.0.12954c4dWEt Qv6

aliexpress.com/item/32527596158.html?spm=a2g0s.9042311.0.0.12954c4dWEt Qv6


hopefully they will fix it
and im going to put the shaft further back past the rudder so it is deeper
Old 04-29-2020, 04:34 PM
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Any updates? Some of us are getting curious
Old 05-04-2020, 05:03 AM
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Major1997
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Sorry still waiting on the parts
Old 05-04-2020, 05:53 AM
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That's okay, the guys and I are just wondering if we got you were you want to be, speed wise

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