Cold weather pondering-hull design '70's SN |
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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Like when Rob Shirley cut a Nautique in half to widen it and create Mastercraft with smaller wakes? (kidding...sort of)... I appreciate and respect your expertise. I have the resources to fool around a bit with this, plus the help of a retired USN sub 'designer.' Have actually abandoned the sacrificial '82 Nautique and have opted to jack with an '81. Lightweight is the first goal. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Going for this design?? |
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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Gawd!! Oh I hope not....
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FredWSauer
Senior Member Joined: August-28-2015 Location: St. Paul, MN Status: Offline Points: 156 |
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Was that underwater boat on purpose? Also, I'd like to thank this thread for making me think about wake quality and now I am looking for my next SN. Wife will hate me. Finally got the lift in for the first SN (1993). The 93 color matches the trailer house so I can't get ride of it and why would you? - Fred |
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- FWS
1993 Ski Nautique 1978 Glastron T-160 1994 Weeres Pontoon - Wife's Boat |
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75 Tique
Grand Poobah Joined: August-12-2004 Location: Seven Lakes, NC Status: Offline Points: 6121 |
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My neighbor's project. Good Hull design, does not porpoise at WOT, which is nice. |
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_____________
“So, how was your weekend?” “Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.” |
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FredWSauer
Senior Member Joined: August-28-2015 Location: St. Paul, MN Status: Offline Points: 156 |
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Not for me! I am very happy on top of the water.
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- FWS
1993 Ski Nautique 1978 Glastron T-160 1994 Weeres Pontoon - Wife's Boat |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Don't forget he had help too,I believe Art was involved |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Looks like a good way to die.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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Blamey
Gold Member Joined: August-18-2015 Location: White Plains,NY Status: Offline Points: 631 |
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Before I had kids I did a bit of Skydiving. During that time someone showed up on the forums stating he wanted to build his own parachute. Most, including myself poo pooed the idea. Saying he was only likely to fail and probably kill himself.
The kid went a head and did it. Built his own ram air parachute. And jumped it. Last time I looked he was onto his 3rd chute. So while before i would've thought your plan was a bad idea, now I say go for it. Understand the risks, prepare for failure but if you want to modify a hull and learn what these boats do, I say go for it. Just be as safe as you can when testing. |
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96 Super Sport
Previously: 95 Sport Nautique, 1980 Ski Supreme |
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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That's really how this idea for hull-work began.....(bench skiing over a couple beers). A 1964 Dunphy X-55 has an unbelievably shallow, soft wake that would rival many dedicated 3-event boats up through the late '90's. The Dunphy is @ a foot shorter than an '81 SN and with the large steps in the rear of the hull, has much less running surface at ski speeds. Yes it's wood, but the Ford 312 Y-block is no featherweight. However, Interceptor chose to fit aluminum front cover, intake, oil pan, exhaust manifolds, and bell housing. The resulting total weight (dry) is only 1815 lbs. There is an obvious correlation between weight and running surface. Now, I'm not interested in turning an '81 SN into a Dunphy X-55 (I already have one), but I think significant slalom wake improvements can be achieved with some subtle modifications including many lightweight drivetrain components (available over-the-counter), a few custom-fabbed pieces, and maybe the incorporation if an adjustable rear plate (ala Supra ts6m). Will post results as we go.... first up, the engine... |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Orlando76
Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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So the humpty dunphy has a flat wake but how does it track? Hold speed? Better than a 196, pffffffttt. MC has a flat wake, maybe even flatter than SN but it’s as hard as a curb.
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Todd, Have you ever driven a X55? Have you ever skied behind one? |
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Orlando76
Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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Never even seen one in person. That’s why I’m asking. Flat wake is only part of the equation. I’ll take a larger wake that’s like butter over a small hard curb.
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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75 Tique
Grand Poobah Joined: August-12-2004 Location: Seven Lakes, NC Status: Offline Points: 6121 |
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Remember this guy/project?
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=39808&KW=&title=1997-carbon-tsc |
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_____________
“So, how was your weekend?” “Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.” |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Todd, What I can say about the wake is to confirm what Brian stated. It's flat soft and shallow. Since you have never skied behind a X, I don't feel this statement you made is fair:
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Orlando76
Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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May not be fair but I bet it’s fairly accurate. I just can’t imagine a wood boat from the 60’s outperforming the advances and technology put in the 196. When I say 196, I mean a true 196 (TSC +) and not the NWZ. And I can’t imagine it tracking nearly as good with a 190lb skier heavy on the line. I would love to ski and drive one in the course as I’m always wanting to ski different boats especially vintage.. bring yours to Sunnyland and give me a pull so I can eat crow! There were definitely some vintage boats with great wakes but tracked like crap. |
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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So, to summarize, we need a Dunphy/196 ski-off on a course that's 10 ft. away from shore and Larry's neighbor will film underwater hull performance from his sub.
I've never seen a Dunphy either. I think it's ok for me to say that I'm pretty confident a 196 is better to ski behind, just like Todd. Some things just are common sense. A lot more than raw wake height goes into evaluating a slalom boat. |
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'63 American Skier - '98 Sport Nautique
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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One item I find interesting is Dunphy incorporated tracking fins on the X55 hull design and that was years before CC used them.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21169 |
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Pete, are you familiar with our reference section? What was the first year for the x55?
http://correctcraftfan.com/reference/bview.asp?id=52#image2 |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Tim, Wow, thanks for the information. I never knew CCfan had a reference section. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11050 |
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Pete, If you read what he referenced you might notice the tracking fin option on the SN before the x55 ever existed
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Ken, Thanks for the civil response. I now stand corrected that Leo did utilize a tracking fin and CC carried that through as an option when the they started building the 1st generation SN in 61. The X55 was produced between 63 and 65. |
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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I think I limited my performance 'comparison' to specifically wake shape. No claim was made that a Dunphy X-55 would "outperform" a mid-to-late 90's era ski boat in every respect. Just that the wake height, shape, and softness would be on par with, or in some cases, exceed those craft. Let's keep things there. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Excellent idea Todd only one problem, Google Illinois route 176, he doesn't go any further south than that |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Gary, 176?? It's more like Wi. 29!!! |
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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Picked up the '81 on Monday evening. Had a couple other projects (cars) to wrap up, but managed to pop out the motor/trans and teardown.
Some of the Ford industrial engine/PCM marine conversion pieces are HEAVY! I'll post a tally of weights of some of the components I'd like to replace. I think I can get 150+ lbs. out of the drivetrain. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Yea those exhausts and a stock intake are not on the light side, velvet drives are not either. Spend the bucks and get some Hi Tek's to lighten the load
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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Some weights so far:
Intake: 47 lbs. Heads, complete: 50 ea. Ex maniforld (stock PCM): 50 ea. Water pump (iron) 14 Timing cover: 13 Motor mounts (compl): 13 ea Trans mounts: 12.5 ea. Starter: 17 Thermostat hsg: 9 |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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I definitely would and did go to aluminum on at least the first three items..
Water pump housings and timing covers are a little more difficult to scrounge the proper parts in aluminum |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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