TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Jet Boats
Jet Boat Projects
Alumacraft Jet Jon Project
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Ranchero50" data-source="post: 384931" data-attributes="member: 1523"><p><img src="https://forum.tinboats.net/download/file.php?id=74604&mode=view/Friday%20may%20day%20002.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I still think 90% of your problem is your front edge of the spoon. I think you really need to smooth that transition out a lot flatter. In the pic it looks like the front and side edges have an abrupt wall. That wall will cause turbulence that I suspect the turbulence is capturing the air in the water column that feeds the pump vs. allow it to travel around the inlet. Your spoon is just a very smooth transition into clean water so the hydrodynamic forces will draw the clean water into the pump. I suspect your design is plowing through the water vs. riding through it. Hard to describe.</p><p></p><p>Just remember, abrupt edges cause shear which leads to cavitation. Cavitation will be amplified by any air in the water stream. I suspect on flat water you still have some cavitation, just not enough to unload the impeller.</p></blockquote><p></p>
[QUOTE="Ranchero50, post: 384931, member: 1523"] [img]https://forum.tinboats.net/download/file.php?id=74604&mode=view/Friday%20may%20day%20002.JPG[/img] I still think 90% of your problem is your front edge of the spoon. I think you really need to smooth that transition out a lot flatter. In the pic it looks like the front and side edges have an abrupt wall. That wall will cause turbulence that I suspect the turbulence is capturing the air in the water column that feeds the pump vs. allow it to travel around the inlet. Your spoon is just a very smooth transition into clean water so the hydrodynamic forces will draw the clean water into the pump. I suspect your design is plowing through the water vs. riding through it. Hard to describe. Just remember, abrupt edges cause shear which leads to cavitation. Cavitation will be amplified by any air in the water stream. I suspect on flat water you still have some cavitation, just not enough to unload the impeller. [/QUOTE]
Verification
Post reply
Forums
Jet Boats
Jet Boat Projects
Alumacraft Jet Jon Project
Top