Jet Boat Droops
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Jet Boat Droops

  1. #1
    Senior Member Boat 405's Avatar
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    Default Jet Boat Droops

    Ok, lots of different droops available these days. I'd like to hear input on them.

    I run a Place HPH droop on the race boat. Works well in junction with a low profile intake,

    I have an aggressor on the 21 daytona. It too has a low profile intake, I've wedged it up to ensure the nozzle doesn't drag in the water, but maintains low thrust line. Maybe someday I'll try the HPH on the 21, be interesting to see what if any difference.

    Duane has his own product which I have not used or seen, Place has a very low droop which works with there add a ride plate kit.

    Some of them have dividers, some don't, some people cut the dividers out.

    I'm more interested in hearing about performance uses, not the added up degree to make a larger rooster tail.
    Boat 405.

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    Senior Member splatter's Avatar
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    I know this isn't really a performance boat, but I was still suprised at the results.

    I have a 21 Carrera with a setback pump, shoe-ride plate, loader and diverter with the standard Berk droop. It rode awesome over 40 and had a top speed of 65. The problem was it porpoised under 40. No problem for the river just go over 40, but now I live at a lake that gets pretty rough and I spend a fair amount of time cruising about 30. I had to put a 4 degree wedge down and put the PD all the way down to get rid of the bounce. I got a High Tech straight nozzle and it completely changed the ride. I run the PD at 0 and the boat rides great at 30. I expected to lose a bit of top speed, but I actually gained 3 mph.

    When we ran BFJ's back in the dark ages, some boats liked a droop and some didn't. You just had to try it. I ran a home built tunnel in the 80's with a low profile intake and it ran better with a straight nozzle. Never tried the mini droop though.

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    Senior Member Chuck Wagon's Avatar
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    Quote Originally Posted by splatter View Post
    I know this isn't really a performance boat, but I was still suprised at the results.

    I have a 21 Carrera with a setback pump, shoe-ride plate, loader and diverter with the standard Berk droop. It rode awesome over 40 and had a top speed of 65. The problem was it porpoised under 40. No problem for the river just go over 40, but now I live at a lake that gets pretty rough and I spend a fair amount of time cruising about 30. I had to put a 4 degree wedge down and put the PD all the way down to get rid of the bounce. I got a High Tech straight nozzle and it completely changed the ride. I run the PD at 0 and the boat rides great at 30. I expected to lose a bit of top speed, but I actually gained 3 mph.

    When we ran BFJ's back in the dark ages, some boats liked a droop and some didn't. You just had to try it. I ran a home built tunnel in the 80's with a low profile intake and it ran better with a straight nozzle. Never tried the mini droop though.

    Do you have a Carrera Eclips?

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    Senior Member Boat 405's Avatar
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    has anyone done a test of a straight snoot, and a regular droop and wedged them so that the thrust height and nozzle angle are identical. I think that for a true test of droops that would have to be accomplished. Now the mini droops may not be applicable because the exit plane of the nozzle is different, maybe a 3" spacer before the droop to make a valid comparison.
    Boat 405.

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    I'm No Expert Shaun's Avatar
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    I have a AT droop now. Pat (lbhsbz) was nice enough to lend me his straight snoot. I'll be testing how the boat reacts different at the TPM deal. Wish i had a HPH to test too.

  8. #6
    Senior Member splatter's Avatar
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    Quote Originally Posted by Chuck Wagon View Post
    Do you have a Carrera Eclips?
    No, an Elite.

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    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by widowmaker View Post
    has anyone done a test of a straight snoot, and a regular droop and wedged them so that the thrust height and nozzle angle are identical. I think that for a true test of droops that would have to be accomplished.
    I believe this would be virtually impossible to do, the included pin angle on the droop vs the snoot would preclude this from being a fair and equal test. If this was possible the straight would win hands down as there would be no dogleg.

    This question is kinda like carburetor spacers, which one is the best? In the end it depends on a multitude of variables as i'm sure you already know.

    Example: an average 19' boat with a standard set pump may like a Full droop, same boat with a setback may like a HPH better, same boat with a setback and a low profile intake may like a straight snoot even better.

    Between these three setups you may be able to use wedges to achieve approximately the same pin angle and thrust height, however so many other variable have changed......my .02

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by [email protected] View Post
    I believe this would be virtually impossible to do, the included pin angle on the droop vs the snoot would preclude this from being a fair and equal test. If this was possible the straight would win hands down as there would be no dogleg.

    This question is kinda like carburetor spacers, which one is the best? In the end it depends on a multitude of variables as i'm sure you already know.

    Example: an average 19' boat with a standard set pump may like a Full droop, same boat with a setback may like a HPH better, same boat with a setback and a low profile intake may like a straight snoot even better.

    Between these three setups you may be able to use wedges to achieve approximately the same pin angle and thrust height, however so many other variable have changed......my .02
    I'm considering the pin angle only slightly significant, because I'll be using a place diverter with adjustable turnbuckle, so that the nozzle angle will be the same.

    I really don't think anyone has done any significant testing with different droops holding the other factors the same. If anyone has please speak up. Going to river next week to do some testing with a data logger, so it should be interesting.
    Boat 405.

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    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by widowmaker View Post
    I'm considering the pin angle only slightly significant, because I'll be using a place diverter with adjustable turnbuckle, so that the nozzle angle will be the same.
    I understand where your going, but keep in mind when you move the Place Diverter from center to correct for pin angle you start cutting down the cross section and you also bend the flow. The I.D. of a Place Diverter is only 3.250 at the ball.

  12. #10
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by [email protected] View Post
    I understand where your going, but keep in mind when you move the Place Diverter from center to correct for pin angle you start cutting down the cross section and you also bend the flow. The I.D. of a Place Diverter is only 3.250 at the ball.
    Yeah, I know. straight shot is most likely going to be the best scenario here. Definately some limiting factors in the overall situation to be considered. Another variable is the exit plane of the nozzle, how far from the back of the boat is the nozzle termination, that too will be a variable, a spacer would have to be added to compensate for the shorter droops. Putting the nozzle farther out the back will add lift to the boat as well.
    Boat 405.

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    Quote Originally Posted by widowmaker View Post
    Yeah, I know. straight shot is most likely going to be the best scenario here. Definately some limiting factors in the overall situation to be considered. Another variable is the exit plane of the nozzle, how far from the back of the boat is the nozzle termination, that too will be a variable, a spacer would have to be added to compensate for the shorter droops. Putting the nozzle farther out the back will add lift to the boat as well.
    Shorter Droops were designed for the Race set intake and Tunnel Hulls so as the Pin ball is not dragging under water... It still includes the 1" Drop while providing a nice transistion of flow in the Drop... Nozzle angle is reset to 3.5 Degree's Up at pin. FYI.

    Josh has a good point on the Diverter with the angle set being a cut off at the adapter point... Aggressor Diverter holds a 3.300 Dia. thru the bore line... In time and with the torque now being built in the motors... the old squeeze of 3.90 will go away and give into 3.125 thru 3.250s and even larger... Its E.T.

    PS: New number is 714-390-5900

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    Senior Member DuaneHTP's Avatar
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    Have to agree. Pops is on it there. The Snoot opening is 4.250" into the nozzle. Now the secret is out. The Snoot does NOT bend the water at that smaller diameter either. Our new Race Nozzle also matches this exit diameter and follows the same formula ratio to the nozzle insert.
    Duane HTP

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    Senior Member bp298's Avatar
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    Quote Originally Posted by [email protected] View Post
    I understand where your going, but keep in mind when you move the Place Diverter from center to correct for pin angle you start cutting down the cross section and you also bend the flow. The I.D. of a Place Diverter is only 3.250 at the ball in stock form.
    there, fixed it for ya...

  16. #14
    Senior Member cyclone's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    Have to agree. Pops is on it there. The Snoot opening is 4.250" into the nozzle. Now the secret is out. The Snoot does NOT bend the water at that smaller diameter either. Our new Race Nozzle also matches this exit diameter and follows the same formula ratio to the nozzle insert.
    Duane HTP
    im in the market for a race nozzle. got some pics and specs of on it?

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