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02-18-2014, 03:33 AM #16
I think that air bleeding is my problem. It compresses at speed and has no where to go but out the back. Because of the engine being heavy and setback the air escape route is very limited. I have tried a 4-blade to give me more stern lift, but it only helps just so much and the porpoising continues.
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02-18-2014, 03:34 AM #17
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02-18-2014, 11:25 AM #186000 RPM
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I forgot to ask how fast the oscillation was. Also might try Bimini up vs down. I would hope it was as simple as more cup in the prop to hold the bite. Another one is are the strands full length or stop before the stern it possible if their short your losing their lift once their out, and bouncing from the transition. Slow oscillation would be the air fast this other stuff.
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02-18-2014, 02:58 PM #19
I would try a few different props and if no better running attitude is attainable I would consider adding a ballast tank in the bow that you can fine tune with pumps, similar to a wakeboat setup!
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02-18-2014, 04:46 PM #20
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02-18-2014, 04:47 PM #21
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02-18-2014, 05:32 PM #22Screaming And Flying!
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More negative trim using alum motor wedges should fix it. Neg. trim would lift the stern and push the bow dn
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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02-18-2014, 08:00 PM #23
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02-18-2014, 08:04 PM #24
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02-19-2014, 07:41 AM #25
first of all, I'd like to comment on the post of finding a prop that will carry the bow! there were many cats or tunnels built that never solved this issue!
It would be a combination of sandbagging the bow with different weight and loads in the boat to figure out how much weight is needed and best location while trying different props. finding possible locations for a tank,tanks or water bags!if you don't do this kind of work yourself, I'd be finding the local custom boat shop and letting them put there brains on the idea!
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02-19-2014, 11:21 AM #266000 RPM
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Sounds mechanical then. The only real answer I have is going back down 1/4 by 1/4 till it goes away. Non pad hulls tend to have a max bow angle. Once past the current fulcrum stability goes out the door and porpoising happens. So prop and weight distribution. Choosing more in the stern or bow is trial and err.
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02-19-2014, 02:42 PM #27
After many 300hp Verados on Playcraft Xtremes I can tell you that the porpoising issue can be controlled with trim. The best I've seen out of these boats was 53mph.- not bad for a 27' 6" pontoon. Tempest props have been the fastest setup but they seem to lead to porpoising much quicker than the Mirage props.
Phil has a new design step hull 2700 Xtreme, it was produced for Midwest Boats and developed at their request-I know of maybe three to five produced nationally.
We have a new model Playcraft Daytona 21' hull -standard Playcraft tritoon. It's powered by a 225hp Mercury Optimax ProXS, Bob's Jackplate. After running many props this past week we ran over 58mph with the Tempest 21" and over 54mph with a 19" Mirage. The Mirage was a way better all around prop but the top end wasn't close. Nor was as trim sensitive as with the Tempest.
Phil-did you try a Mirage yet?
Performance Pontoon & Deckboats LLC
Tritoon Performance Specialists
Volusia, Florida
Phone 386-490-3666
fasttoons@gmail.com
www.fasttoons.com
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02-20-2014, 04:30 AM #28
BTW - the step hull was originally produced for Midwest Boats at their request. I was told that Terry at Midwest went through over 25 different set ups to arrive at the set up he has. It had to take many hours, first to convince Playcraft to build the hull for him and then to do the setup work. Playcraft is a custom builder building what the customer wants.The dealer that Phil bought from gave him a lower price for the boat and had zero set up time on the hull.
Why would Terry, after spending all those hours developing the hull and setup return Phil's calls?
BTW- Terry won the first closed course sanctioned pontoon race with the set up at the LOTO races last June.
Performance Pontoon & Deckboats LLC
Tritoon Performance Specialists
Volusia, Florida
Phone 386-490-3666
fasttoons@gmail.com
www.fasttoons.com
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02-20-2014, 08:05 AM #29
I have always felt that setback and porpoising are closely related! I would be curious how much speed is lost and how the drivability improves with reduced setback! I would happily lose a couple mph for a hull that doesn't porpoise!
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02-20-2014, 09:13 AM #30
jmho.
that 19p tempest (STOCK) will never work on that rig. the higher ya go with a prop that has tips that lay back will make it worse.
try a mirage with good cupping and wrap it around the tips. or better yet.. get that tempest worked on. straighten out the tips and work the cupping.
you'll be amazed at the difference.
and btw.. sending that prop to mercury to make it labbed won't fix your problem either. they will thin the prop down and not work the blades for your rig. that's been my experiences over the last 21 years.
just my opinion.98 XR2001 Drag w/pro stock mota