on the fly adjustable nozzle orifice.....
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on the fly adjustable nozzle orifice.....

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    Senior Member cyclone's Avatar
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    Default on the fly adjustable nozzle orifice.....

    awhile ago we talked about it. did anyone ever do anything with it?

    a nozzle that could switch from a 3.00 to 3.140 inside diameter on a timer would be the bomb.

    i see several tenths in potential ET improvement in a drag boat and a much more efficient lake boat in cruise mode with something like this...

    am i nuts?

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    Senior Member 1320h2o's Avatar
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    Quote Originally Posted by cyclone View Post
    awhile ago we talked about it. did anyone ever do anything with it?

    a nozzle that could switch from a 3.00 to 3.140 inside diameter on a timer would be the bomb.

    i see several tenths in potential ET improvement in a drag boat and a much more efficient lake boat in cruise mode with something like this...

    am i nuts?
    What did he just say????

  4. #3
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by cyclone View Post
    awhile ago we talked about it. did anyone ever do anything with it?

    a nozzle that could switch from a 3.00 to 3.140 inside diameter on a timer would be the bomb.

    i see several tenths in potential ET improvement in a drag boat and a much more efficient lake boat in cruise mode with something like this...

    am i nuts?
    you're not nuts. i've thought about that alot along with a adjustable on the fly shoe/or loader would be awesome and take the sport to a ho nutha level i think in the e.t. dept. imagine having shoe depth a 1/2 deep leaving the hole and as intake pressure goes well into the positives, shoe starts moving up into the boat a lil at a time.
    thrust vectoring is da chit with jetplanes and there'd be merit in that too. you could use a overbored nozzle with a airbag type inner liner with a 3.25 sleeve at each end, use air or c02 to expand the inner liner to swell itself. wouldn't be hard to make, just find a nice old thick nozzle, bored it as big as possible, find some lil semi truck driver seat airbags. i don't see how reducing like a jetplane would do great though.be like sprayin wd40 with or without a straw in the sprayer.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member cyclone's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    you're not nuts. i've thought about that alot along with a adjustable on the fly shoe/or loader would be awesome and take the sport to a ho nutha level i think in the e.t. dept. imagine having shoe depth a 1/2 deep leaving the hole and as intake pressure goes well into the positives, shoe starts moving up into the boat a lil at a time.
    thrust vectoring is da chit with jetplanes and there'd be merit in that too. you could use a overbored nozzle with a airbag type inner liner with a 3.25 sleeve at each end, use air or c02 to expand the inner liner to swell itself. wouldn't be hard to make, just find a nice old thick nozzle, bored it as big as possible, find some lil semi truck driver seat airbags. i don't see how reducing like a jetplane would do great though.be like sprayin wd40 with or without a straw in the sprayer.
    I'm pretty sure Dan Nelson has an adjustable shoe on his Daytona. He told me about it over a few beers this summer.

    squeeze your nozzle down a bit and see what it does for your holeshot...

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    Senior Member jetboatperformance's Avatar
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    A few years back a guy called me from norcal and said he was in the process of developing and patenting this very thing , wanted to know what the Market would be like .... never heard back ... what a concept! Tom

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    Senior Member cheyenne580's Avatar
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    Quote Originally Posted by cyclone View Post
    I'm pretty sure Dan Nelson has an adjustable shoe on his Daytona. He told me about it over a few beers this summer.

    squeeze your nozzle down a bit and see what it does for your holeshot...

    Hey Mike....you are right Nelson has a adjustable shoe on the daytona and he has work on a noozle too.{623-780-1909}


    Jim S

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by cyclone View Post
    I'm pretty sure Dan Nelson has an adjustable shoe on his Daytona. He told me about it over a few beers this summer.

    squeeze your nozzle down a bit and see what it does for your holeshot...
    squeezing my nozzle down from 3.25 killed my boat outta the hole, it loved the 3.25 but intake pressure past 700ft didn't.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member cyclone's Avatar
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    Quote Originally Posted by cheyenne580 View Post
    Hey Mike....you are right Nelson has a adjustable shoe on the daytona and he has work on a noozle too.{623-780-1909}


    Jim S
    thought he told me he did. how you doin jim?

    what's he got going on with the nozzle?

    Brule told me his brother built one years ago for the head over heels boat i think. ill have to ask him what happened to it.

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    Senior Member cyclone's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    you're not nuts. i've thought about that alot along with a adjustable on the fly shoe/or loader would be awesome and take the sport to a ho nutha level i think in the e.t. dept. imagine having shoe depth a 1/2 deep leaving the hole and as intake pressure goes well into the positives, shoe starts moving up into the boat a lil at a time.
    thrust vectoring is da chit with jetplanes and there'd be merit in that too. you could use a overbored nozzle with a airbag type inner liner with a 3.25 sleeve at each end, use air or c02 to expand the inner liner to swell itself. wouldn't be hard to make, just find a nice old thick nozzle, bored it as big as possible, find some lil semi truck driver seat airbags. i don't see how reducing like a jetplane would do great though.be like sprayin wd40 with or without a straw in the sprayer.


    this sounds promising. i wonder if you could force enough air pressure into the bag to actually close of the opening against the water pressure. that's a alot of nozzle pressure to work against.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by cyclone View Post
    this sounds promising. i wonder if you could force enough air pressure into the bag to actually close of the opening against the water pressure. that's a alot of nozzle pressure to work against.
    i see what ya mean, 500psi of water pressure vs maybe 100psi of air pressure. maybe some badass outliner made of super fine stainless so pressure on the bag could be ramped up and the reduction still have somewhat a smooth flow. when there's a will, there's a way.bet there's enough heads here on this site to come up with a sick set-up.

    i see what you mean by a smaller nozzle at the start, fill the bowl faster. maybe my boat was weird or something, but it did like the bigger i.d. for some reason. at 3.060 i was happy with intake pressure, but i'd sacrificed some holeshot shove for it. could feel it, but as much nitrous as i was running, it didn't matter alot.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member cheyenne580's Avatar
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    Quote Originally Posted by cyclone View Post
    thought he told me he did. how you doin jim?

    what's he got going on with the nozzle?

    Brule told me his brother built one years ago for the head over heels boat i think. ill have to ask him what happened to it.
    Mike, Dan was playing around with one when we were racing and i don't know what he did with it.You will have to call him.When i drove the Head over heels boat there was'nt one on it at that time.i'm just waiting for it to warm up so i can get the boat out.

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    be neat as hell to go out and find a nice stretch of good water, get a 5krpm cruise goin with the gps on and intake pressure gauge reading steady, then start jacking with nozzle size on the fly and see what happens to the numbers.

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    Senior Member GT Jets's Avatar
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    I have one of these, but it doesn't do what you might think, I had it on a Specrta 20 for a while and made it plane like it was scared, it did not seem to do anything at all for top end but the holeshot was definately effected.

    I could never get it to work right with a reverse gate, right about that time I had an accident with a powertool (severe hand injury) and spent the next year in physical therapy and trying to pay the bills, would there be a need for this still, I figured someone would have done it already?

    I think I know what it would take to get a reverse gate to work with it, just had a bad taste in my mouth with the whole Marine Repair Buis., it made me file chapter 11 about 13 years ago, just never went back...

    The one oddity was that the top end RPM actually dropped by about 150 RPM, can't explain it to this day.

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

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    Quote Originally Posted by GT Jets View Post
    I have one of these, but it doesn't do what you might think, I had it on a Specrta 20 for a while and made it plane like it was scared, it did not seem to do anything at all for top end but the holeshot was definately effected.

    I could never get it to work right with a reverse gate, right about that time I had an accident with a powertool (severe hand injury) and spent the next year in physical therapy and trying to pay the bills, would there be a need for this still, I figured someone would have done it already?

    I think I know what it would take to get a reverse gate to work with it, just had a bad taste in my mouth with the whole Marine Repair Buis., it made me file chapter 11 about 13 years ago, just never went back...

    The one oddity was that the top end RPM actually dropped by about 150 RPM, can't explain it to this day.

    GT
    bet bowl wasn't vacating as fast with the smaller opening. got any pics?

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