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Seadoo sportster nose dive

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yes the bow is low when at idle or 5 knot, but slowing down from cruising the nose shouldn't dunk. imagine slowing from 50mph and the nose goes under!!!
i have slowed from 40, 50, 60, 65 and even 70 and my nose has never gone under, only a well placed deceleration before a wave or wake.
 
pete63 said:
yes the bow is low when at idle or 5 knot, but slowing down from cruising the nose shouldn't dunk. imagine slowing from 50mph and the nose goes under!!!
i have slowed from 40, 50, 60, 65 and even 70 and my nose has never gone under, only a well placed deceleration before a wave or wake.
Click to expand...

What do you have under the hatch that allows you to go 70 mph? It is certainly not stock!
 
I have some 80's Buick stuff and half the bolts are metric, the other half are SAE, so my guess is 45MPH is bout 70 KPH, that's probably what he meant.

Performance of boats is judged by top speed at WOT RPM, so you guys should have already nailed this down in this thread b/b this info tells us if something's not right. BTW, ever get that sinking feeling running an engine WOT until it grenades and perforates the cases? Was it worth the experience? Short blasts only, please..... (IMO)
 
There are at least two factors to consider when looking at the video. First is max load capacity; 700 lbs, right? Three adults could be 600 easily. Next is where they are sitting, (load distribution). Looks like one is forward. Try the same test with all 3 sitting aft. This hull does not have much buoyancy up front but the v-bow does cut rough water well for tiny powerboat. If the throttle was chopped from full and shifted to neutral at the same time there would be extra braking force causing the bow to dip.

My wife and I say that our 05 Sportster is the best TWO-person boat around. Add one or two more passengers and the experience can be scarey if you are not careful.
 
Sportster-2001-951C-Stock said:
I have some 80's Buick stuff and half the bolts are metric, the other half are SAE, so my guess is 45MPH is bout 70 KPH, that's probably what he meant.

Performance of boats is judged by top speed at WOT RPM, so you guys should have already nailed this down in this thread b/b this info tells us if something's not right. BTW, ever get that sinking feeling running an engine WOT until it grenades and perforates the cases? Was it worth the experience? Short blasts only, please..... (IMO)
Click to expand...

dont understand, whats your point!?
 
i havent called you a liar before......
so why put down something you dont know?
i was stating a point that my 150 nose has never gone under at various speeds i have done!
 
Lets keep this polite,,, The potential for help and good info for all is why we are here. Even if you do not have something to add that may help for this specific issue, you are welcome to post. But do so in a polite manner...

Thank you, Coastiejoe...


Sent from my iPad using Tapatalk
 
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I have a 150 Speedster and I've pulled the lanyard from on a plane without swamping the bow. We did take quite a bit of water once when the gf was sitting all the way forward, where you're not supposed to sit, while she wrapped up the anchor line. I don't think the cockpit bails as well as I'd like. I'll probably install another drain over the winter. I might even use an electric bilge pump for the cockpit.

I also want to install the pump siphons found on the skis. I don't know why they didn't put these in the boats.
 
pete63 said:
i havent called you a liar before......
so why put down something you dont know?
i was stating a point that my 150 nose has never gone under at various speeds i have done!
Click to expand...

I wasn't calling anyone a liar, didn't mean to sound that way at all if that's the way it sounded I appologize was unintended.

I do have a buick with 1/2 metric other half SAE, sometimes numbers I hear makes me wonder which units are applicable and not many of these boats will do 70mph, Australia's a metric unit country, right?

Cheers, mate! :)
 
pete63 said:
dont understand, whats your point!?
Click to expand...

Points were:
1) It's unwise to run constant WOT (IMO)
2) 45MPH is approximately 70KPH, about the top speed of many Seadoo boats.
3) It's accepted practice in the marine industry to benchmark boat performance against WOT speed. Very common benchmark important for comparison to determine if a problem exists.

But I'll add, if your boat does 70MPH you should mention it's modified, as a common courtesy.
 
Sportster-2001-951C-Stock said:
I wasn't calling anyone a liar, didn't mean to sound that way at all if that's the way it sounded I appologize was unintended.

I do have a buick with 1/2 metric other half SAE, sometimes numbers I hear makes me wonder which units are applicable and not many of these boats will do 70mph, Australia's a metric unit country, right?

Cheers, mate! :)
Click to expand...

no worries mate......

found an old video, for the nose dive chat........
the last part of the video i was at about 45 slowed slowed to pull into a small anchoring bay of the river, notice the bow didnt at all dive.


ps
(at the very start about 60)

https://youtu.be/TRmgkeJ8lwI
 
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As stated, Seadoo's carry their bow low, having said, just that backing off the throttle shouldn't swamp the boat unless you're in serious chop. My Challenger has only been swamped once that was from another boat's wake while idling at no wake speed w/ people sitting up front, since that day I constantly watch for "in-coming" and simply blip the throttle to lift the bow over the wake. Especially helpful when you are circling back to pick up a downed skier and have to cross your own wake...
 
xintersecty said:
I love that turbo and your video of it running had a great sounding engine.
Click to expand...

i have revert back to stock super charger (i have to repost in the modify section "re-modify" lol.
i still have the straight through exhaust, you either love a engine note or you dont!! i had a buell before so i love a nice sounding engine.
the turbo, yeah fast......
but so much money for maintaining, two turbo rebuilds, 3 waste gates, head gasket, coolant sensor, scored cyclinder.
a turbo in a enclosed engine bay is asking for problems....etc.

i cant say it wast fun blowing away modified jet ski's, there always a price for fun!! its fun cruising at 55- 60 but over 60 you cant see much and things appear in front of you very fast, these boats don't steer very good when there is little jet thrust and you have speed.
the faster i went was 73mph with a 13/18 skat trac, with turbo still winding up, the problem was the impeller and low pressure building up (lifting the stern) scary!!

thats why i dont really like big mods on standard boats, small mods are good but dont be fooled by big gains, your will better off building a customized boat from the start.
now i happy with a nearly stock config and just enjoy cruising around.
 
Prior post talked about going fast with the Bimini up. I'm always nervous about that. Wind pressure at 40mph+ puts a lot of stress on it. Mine has warnings about not going fast. Would think it could pull out the hinges or snaps.
 
With just myself and about half a tank of gas, my speedster does about 55 MPH. I have done it with the bimini up plenty of times. No problems

With the wife and my 8 year old son and a cooler with snacks in it i can hit 51 MPH. Bimini has never been a problem. Its the factory Seadoo dealer installed one.
 
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pete63 said:
the faster i went was 73mph with a 13/18 skat trac, with turbo still winding up, the problem was the impeller and low pressure building up (lifting the stern) scary!!

i happy with a nearly stock config and just enjoy cruising around.
Click to expand...

Yet the turbo did look pretty cool siting there. :) Was wondering which impeller you fitted.
 
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