01-28-2008, 02:12 PM #1
Has this intake grate been tried?
Has anyone made a intake grate that has a hydrodanamically movable wing? Compared to some of the things some of the very talented machinist on this board are making, doesnt seem hard to put out a working prototype
Imagine 2 bar grate, with bearing mounted wing. As pressure builds in the tunnel the wing closes its angle.
Seems like the benefit would be increased hookup in choppy water ( with more aggressive wing angle, coupled with more safety and speed in smooth water with less aggressive angle and decreased pump tunnel pressure.
It wouldnt load the bolts, tunnel, and shoe mounts nearly as hard......
I am sure someone has experimented with an 800 grate and using jbweld, or welding, changed the angle of wing and or closed off the tunnel?
01-28-2008, 03:21 PM #2
- Join Date
- Apr 2006
- panama city beach 'fl
bruce at AAT (wetwolf) was playing with something like that but gave up
01-28-2008, 10:40 PM #3
- Join Date
- Nov 2006
The pressure on that wing bearing would be tremendous!! The trick would be how to convert the drag during hook-up in to reduced angle at speed. In rough water with the grate unloading would it reset to the intial hook-up position?? Not knocking the idea, just thinking out loud...
01-29-2008, 12:44 AM #4
what if it had a high tension spring? it would keep the wing down (steep) when theres low pressure/unhooked and as pressure builds the wing would decrease in angle...
if the wing snaps back to the steep position when the pump gets unhooked, the bars where the wing contacts it might get worn.
Last edited by RDH; 01-29-2008 at 12:54 AM.
01-29-2008, 01:48 AM #5
I'm not so sure a spring would be a great idea. Think about this; you are at WOT, hit a little burble in the water, you come unhooked and the spring contracts, drasticly chaging the angle of your intake scoop in an instant. Not cool.
One idea I had.... which not only would have serious engineering problems, as well as possibly the same problem I described above.... was a scoop set into a track, with small but stout shocks pushing it down. As pressure on the scoop increases, it slides back a bit, allowing more water into the pump.
Probably a dozen reasons why it wouldn't work, and even if it would, it would take a huge amount of R&D... but just my 2 cents.
01-29-2008, 04:50 AM #6
The way I envisioned it was a hydrodynamic ram...
Its kind of like what they use on speedopickups on high performance speed boats... the more the waterpressure increases, then more it puts pressure on the ram...
You wouldnt need a spring to pull wing down, the water would do that, and as water pressure in tunnel increases, it fills the ram to push the wing closed. You could adjust size of orfice to dictate opening and closing speed so it wouldnt change instantly, but be a more gradual effect.
Even full open to full closed wouldnt be drastic, just a couple degrees...
I can see it in my head.....
01-29-2008, 04:57 AM #7
[quote=Smitty;522871]was a scoop set into a track, with small but stout shocks pushing it down. As pressure on the scoop increases, it slides back a bit, allowing more water into the pump.
Actually a shuttervalve is what I think your describing, but I think you mean to say as pressure on scoop increases, it slides back a bit (if mounted in front of grate) decreasing the amount of water in pump.
I really like that idea if its like this.......
Say a 1200 grate design with tracks in it... a plate mounted in front out of waterflow(maybe 1in long) and as pressure in tunnel increases, the plate slides back closing off front of tunnel which will allow for higher ride angle and decreased pressure in pump....
I kinda like that idea better then variable wing.....
Smitty, when will you have one ready to test?
01-29-2008, 05:19 AM #8
01-29-2008, 06:07 AM #9
01-29-2008, 06:57 AM #10
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