SoCal Jet Boats
Tech Talk => Jet Pumps => Topic started by: Stevecat on July 29, 2008, 10:11:47 AM
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Anybody have any experience with skegs located 4-5' in front of the intake?
Yes I know we're not supposed to do it, say it, or even think it. But I want to know if anyone has tried it. I'm talking about those 2 or 3 fin jobs at mid hull - like on ski/wakeboard boats. The skegs are there to help keep it tracking straight when I'm pulling 10 g's during my awesome slalom turns.
Everything I've read says the risk is creating turbulence behind the skegs and before the intake. But hell, the friggin intake rock grate is a hydrodynamic abortion itself. The only way I see the mid-hull skeg creating turbulence is if the boats going sideways down the river and if that's happening then I've got some bigger problems.
OK - so let me have some group wisdom!!!!
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i dont know about turbulance but, it would bow steer like crazy being out there so far
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i think he is referring to a turn fin.....50"-55" from the transom.....it doesnt create enough turbulence to worry about for lake boat use, but if youre lookin to shave seconds off your 1/4 mile time, then dont have one.
mainly they are there to help the boat turn....placement/size is important to your setup.
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Anybody have any experience with skegs located 4-5' in front of the intake?
OK - so let me have some group wisdom!!!!
this says 4to5 feet, i think that would cause bow steer
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this says 4to5 feet, i think that would cause bow steer
well yeah, thats ridiculously too far forward.
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Clarification: I don't race my boat - I ski a lot with it. Yes I am talking about turning fins located mid-ship on the "keel". Just like 1000's of tournament ski/wakeboard boats.
Thanks keep the comments coming!
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Our Spectra 20 has one around 7' forward of the transom. We have owned/used the boat for 20 years, and bought it from the original owner who was an employee of Spectra back in the early to mid 70's.
Regards, Mark
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I have a set in my boat, it used to race roundy round ;D i still need to sand down the filler and speed coat them 8) Should give me an extra 50 horses :screwy:
Can't wait to see how it sticks in the turn.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi223.photobucket.com%2Falbums%2Fdd269%2F2savage4you%2F001-42.jpg&hash=3668efada2bc9111c52801ee42b7bcac8f83f4ed)
2sav
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I think at 48 to 50" is the limit . Jets dont like them too far forward . I believe the measurment is taken from the back of the fin too. Lots of jet boat actually came with them too and they do enhance the handling of any boat IMO especially in slolom type course or driving .
-beerjet-
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I had them on my first 18' Renegade, there were two small ones made out of stainless and were about (never actually measured them) 2' in front of the pump intake, that boat had extended pump fins too, also had a handmade rudder, the thing turned like a mother O0 but you really had to be on your toes (drove like a friggen go cart) lets just say slop did not count the same as skill. The one thing I do remember is if you dropped a skier and turned the boat around real hard, you could literally scoop up your own wake across the bow, really freaked people out >:D
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Look at some of the other threads on the site, we have talked a lot about turn fin location. Locate it at the CG and you will be fine.