bowl leading edge!!!
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bowl leading edge!!!

  1. #1
    Pro Gas Jet RedPearl's Avatar
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    Default bowl leading edge!!!

    Has anyone found an advantage with the radius edge versus the straight edge?
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    Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by RedPearl View Post
    Has anyone found an advantage with the radius edge versus the straight edge?
    Interesting question I would like to hear responses! I know how air and water flow over, thru and around directional surfaces and if anybody pipes up this would be a good read!!! FWIW I know how fins are made for surf boards and how wings are made for Planes! Kinda funny but the airo and hydro dynamics play alot in how to give a bowl all the help it can get. Reduction of aireation on entry and exit play with the bowl alot. IMLAO M

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    RLP
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    Quote Originally Posted by ol guy View Post
    Interesting question I would like to hear responses! I know how air and water flow over, thru and around directional surfaces and if anybody pipes up this would be a good read!!! FWIW I know how fins are made for surf boards and how wings are made for Planes! Kinda funny but the airo and hydro dynamics play alot in how to give a bowl all the help it can get. Reduction of aireation on entry and exit play with the bowl alot. IMLAO M
    seems no one can say much on bowls.
    I have called all over the world trying to see if there is a better performing
    bowl than my berk G bowl

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    Senior Member DuaneHTP's Avatar
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    You get a better flow by stopping some static lock.

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by RLP View Post
    seems no one can say much on bowls.
    I have called all over the world trying to see if there is a better performing
    bowl than my berk G bowl
    Well I tell you what! I will pipe up and give the info that I know! The leading edge is important as far as airiation into the bowl goes. The last thing you would want is bubbles at high speed going thru a directional force. So for that clean and make smooth surface for the water to flow thru. I would not polish any area in the bowl and reason being that water flows best on water. Water comes off a sharp edge better than it enters. May sound funny but if you think about the dynamics part it will make sense. Skags or Skegs however you prefer are normally of a rounded nature on the leading edge and sharp at the trailing edge. I clean-up porous areas and knife edge the exit and slightly round the entry area. Seems to work for me? If you look at an airplane wing it follows the same dynamics and flies at 600 mph, not to mention gets off the ground. IMLAO M

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    Quote Originally Posted by ol guy View Post
    I would not polish any area in the bowl and reason being that water flows best on water. Water comes off a sharp edge better than it enters. May sound funny but if you think about the dynamics part it will make sense. Skags or Skegs however you prefer are normally of a rounded nature on the leading edge and sharp at the trailing edge. I clean-up porous areas and knife edge the exit and slightly round the entry area. Seems to work for me? If you look at an airplane wing it follows the same dynamics and flies at 600 mph, not to mention gets off the ground. IMLAO M
    X2. Here's the basic tradeoffs of shapes for leading edge and drag coefficients. Ol guy is describing 2nd from bottom on the list = streamlined body.

    Man, I could use a good streamlined body right about now.
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    RLP
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    ya know Mr.Papp was doing a test in HotBoat on bowls but was never finished.
    if i had the money i would buy Aggressor,AMT,dominator and see if
    one out performs the other.
    hard to beleave all these and berk G perform the same

  10. #8
    Senior Member DuaneHTP's Avatar
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    They don't perform all the same. Some are better for one application than the other. There are a lot of specifics that determine which one might be better for your application. That's our job as a pump builder; to help you pick out the rignt one for your application. call me if you have ? 417-858-8616.
    Duane HTP

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by ol guy View Post
    Well I tell you what! I will pipe up and give the info that I know! The leading edge is important as far as airiation into the bowl goes. The last thing you would want is bubbles at high speed going thru a directional force. So for that clean and make smooth surface for the water to flow thru. I would not polish any area in the bowl and reason being that water flows best on water. Water comes off a sharp edge better than it enters. May sound funny but if you think about the dynamics part it will make sense. Skags or Skegs however you prefer are normally of a rounded nature on the leading edge and sharp at the trailing edge. I clean-up porous areas and knife edge the exit and slightly round the entry area. Seems to work for me? If you look at an airplane wing it follows the same dynamics and flies at 600 mph, not to mention gets off the ground. IMLAO M
    well said !

  12. #10
    Pro Gas Jet RedPearl's Avatar
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    Quote Originally Posted by ol guy View Post
    Well I tell you what! I will pipe up and give the info that I know! The leading edge is important as far as airiation into the bowl goes. The last thing you would want is bubbles at high speed going thru a directional force. So for that clean and make smooth surface for the water to flow thru. I would not polish any area in the bowl and reason being that water flows best on water. Water comes off a sharp edge better than it enters. May sound funny but if you think about the dynamics part it will make sense. Skags or Skegs however you prefer are normally of a rounded nature on the leading edge and sharp at the trailing edge. I clean-up porous areas and knife edge the exit and slightly round the entry area. Seems to work for me? If you look at an airplane wing it follows the same dynamics and flies at 600 mph, not to mention gets off the ground. IMLAO M
    I would think that the less airiation you can get would mean more thrust and more water pressure, BUT how come my jacuzzi jets with the vent closed dont thrust as much as when i open the vent to let air in the jets develope more thrust??? Im a little slow so bear with me!!! lol!
    Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!

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