Glastron CVX16 and 150 V6

[Old Ironmaker]

Excellent. You have a way with words. Typical west coast weather you describe too. Slightly
further to the north, still on west is where the beauty spots begin.

Thanks for the kudo. Publishers don't agree. The Scot Grand Father, Jock McCulloch, had stories of caddying for the rich golfers there, he was born in 1899. He was 8 when he started caddying the courses in Troon. The birthplace of golf, just ask anyone there.

 

[Texasmark]

All due respect, but a V-6 on the back of a 16' boat? Seems like an incredible amount of weight being placed on the transom. Keep us posted though. I'm interested in hearing how it turns out. -Al

It's a deep V with lifting strakes to the stern with something like 20+* of deadrise at the stern.

First off that hull will eat up some of your pitch. Second need to know your gear ratio. Third temperature-air density.....cool foggy morning vs hot and dry afternoon.....in the UK????? I was there, never had one. Seems the 150 could come with 2:1 or 1.87:1; RPM range 5 to 5.6k. Bam Go Fast PSC says:

24P (and we're talking about a decked out SS) at rated max rpms, figuring 15% slip with that hull (lot of boat in the water if not with setback and a pad...which I didn't see in your picture even though it has lifting strakes..... 2.0 gearbox will get you 54 actual and a 1.87 58.....Son had a Pro craft 18 fish and ski and with 3 of us 54 was tops on a cool spring morning. Don't remember RPMs, prop pitch nor gear ratio....but that's a number.

26P if the engine could pull 5600 would up you to 59 or 63.

 

[QBhoy]

It's a deep V with lifting strakes to the stern with something like 20+* of deadrise at the stern.

First off that hull will eat up some of your pitch. Second need to know your gear ratio. Third temperature-air density.....cool foggy morning vs hot and dry afternoon.....in the UK????? I was there, never had one. Seems the 150 could come with 2:1 or 1.87:1; RPM range 5 to 5.6k. Bam Go Fast PSC says:

24P (and we're talking about a decked out SS) at rated max rpms, figuring 15% slip with that hull (lot of boat in the water if not with setback and a pad...which I didn't see in your picture even though it has lifting strakes..... 2.0 gearbox will get you 54 actual and a 1.87 58.....Son had a Pro craft 18 fish and ski and with 3 of us 54 was tops on a cool spring morning. Don't remember RPMs, prop pitch nor gear ratio....but that's a number.

26P if the engine could pull 5600 would up you to 59 or 63.

Love an answer with real maths behind it.

I don’t know the gear ratio to be honest, but to be honest I would expect 60 out it anyway.
I’ll need to go check prop slip calculators once I get it running.
All I know currently is that the engine was on another quite standard glastron ssv167 hull which I bought just for this engine.
On a quick test...the boat got to 54mph gps on that. Tach wasn’t working but I pulled back really quickly as it was in my opinion over revving to my ear. That was with a 21” laser 2...in bad shape but also looked tampered with. Leading edges looked much thinner than any other out the box laser 2 I’ve seen. Couldn’t say for sire it was a 21” still. Wouldn’t be far off it though. It got out the hole like a rocket ship. At 54 mph, the boat became really unstable and started chine walking badly.

there are guys running 26” rakers on the us version with same engine. I’ve been in touch with a few of them. They seem to suggest late 60’s is easy for them. 70 is a thing with jack plate.
I imagine, like most of these old merc v6...they are pushing the rpm towards or over the 6000 area.

 

[Texasmark]

The PSC will answer that question for you. When you plug in other parameters and have low single digit slip on a deep V, and slip moves into the negative region when you back into it like would be the case here, you can figure somebody is feeding you or their instruments are feeding them!

You can answer the gear ration question yourself with the prop and flywheel. 2:1 is obvious. For 1.87 use a compass and measure how far you are behind in degrees on the second revolution and do the fraction and percentage with the angle ratios.

So playing with numbers, 1.87 was shy of the full 2nd rev by only completing......87% of the full 360 or 314 degrees.....easy to guesstimate a 45 degree angle with no instruments. As we all know, on the compass rose it's right at NW.

 

[QBhoy]

The PSC will answer that question for you. When you plug in other parameters and have low single digit slip on a deep V, and slip moves into the negative region when you back into it like would be the case here, you can figure somebody is feeding you or their instruments are feeding them!

I don’t know what psc is I’m afraid.
it’s not a deep v, or at least comparable to the deep v I’ve ever had and currently have on other boats.
single figure slip is achievable for sure. I achieve this on my fletcher and campion. Proven without doubt. Campion has a pad to be fair, but fletcher doesn’t.
I’d think the glastron would not be considered a deep v

 

[Texasmark]

I don’t know what psc is I’m afraid.
it’s not a deep v, or at least comparable to the deep v I’ve ever had and currently have on other boats.
single figure slip is achievable for sure. I achieve this on my fletcher and campion. Proven without doubt. Campion has a pad to be fair, but fletcher doesn’t.
I’d think the glastron would not be considered a deep v

PSC = Prop Slip Calculator. The stern picture you posted surely was a deep V with lifting strakes. The stern on my recently purchased Crestliner is 12 degrees at the transom and your boat is a whole lot more than that and maybe more than 20 I guesstimated.

 

[QBhoy]

PSC = Prop Slip Calculator. The stern picture you posted surely was a deep V with lifting strakes. The stern on my recently purchased Crestliner is 12 degrees at the transom and your boat is a whole lot more than that and maybe more than 20 I guesstimated.

You may be right. But it’s a shallow hull for sure.
just checked there. It has a pad too.

 

[QBhoy]

PSC = Prop Slip Calculator. The stern picture you posted surely was a deep V with lifting strakes. The stern on my recently purchased Crestliner is 12 degrees at the transom and your boat is a whole lot more than that and maybe more than 20 I guesstimated.

You may be right. But it’s a shallow hull for sure.
just checked there. It has a pad too.

 

[Texasmark]

You may be right. But it’s a shallow hull for sure.
just checked there. It has a pad too.

Well the pad is your salvation. All bets are off with that....you may see your aspirations!

Big guns on here used to flaunt 1" jack for every 6" of setback, not from the transom per se, but the aft extent of the wet hull, like some BB and other boats are offset (cut back) 6" in the hull before you put a jack plate on it.

My first bow lifting experience, where the boat left the water was a new 1989 17'6 Ranger Fisherman which was a Ranger style Bass Boat hull, but narrower, with a deeper V and the pad, rigged out for Back Trolling like they do here up North for Walleye and maybe Pike and Muskies, even Striped Bass, or crappie fighing brush piles down here. Bought it from a big dealer in Dallas.

Had an original Laser SS on a 115 "Tower of Power" and she was a 50+ boat On my shake down cruise, she started chine walking at 55 and I backed off the throttle. Didn't look at the tach as I was busy wondering "wondering where do I go from here). As I recall the Laser was a 24P which makes sense since that's what he put on his popular 150 HP Bass Boats and had them in stock....sold very few 115s. I took the prop back to him and he ordered and got in a Laser 19P for me as I recall, which I never took off and that engine had no problem seeing 6k with it and loved it. Being ported (ports were round and ⅜" recollecting, on the original Laser) I could hammer down on it in the hole and get a good, fast, shot, then up at a good speed as I was trimming out, the prop would lock in, the boat jolted when it did it and I took off.......grinning all the way.

I used to love to hear it singing and the blades of the prop hitting the water making a humming noise when I was hooked up and on the sweet spot. Trim sweet spot was out till RPMs started rising and speed started dropping off.....tucked back in slightly till the numbers went back to max.

Rangers had a pretty much zero tilt transom angle and had the 6" hull offset....inset really, so they could take the angle out of the transom which most mfgrs. have to get the LU out from the transom for less ventilation I guess. With the shallow transom angle you could get higher trim angles without running out of trim (the 20 degrees on Mercs). The other thing, as I see it, by having a deep V and the pad, once on the pad, the spray is clear to exit under the boat (out the sides) as there wasn't any hull in the way to deflect it helping to maximize MPH. That was my first boat that I felt lift off the water and had fun with it....didn't need to do any fishing, just play with it.

This wasn't a hot dog Cigarette go-fast boat or any of that....just a middle aged guy (at the time) with a new, stock, fishing boat experiencing things never experienced, having a great time.

 

[ahicks]

Just getting old I guess. Pretty familiar with what 70mph+ looks like behind the wheel of a boat going that fast. If I were going to be running a boat at speeds over 50mph, and certainly those over 60 or so, I would want a bigger boat, like a 19 or 20'. I think they would be much more forgiving when "stuff" happens. Not saying those speeds can't be done in a smaller (16') boat. Just questioning the safety (wisdom) of doing that....

That said, the baby (16') Donzi's with I/O's powered by crazy hp small block V-8s have been doing this sort of thing for years. Just not my cup of tea........

 

[QBhoy]

Just getting old I guess. Pretty familiar with what 70mph+ looks like behind the wheel of a boat going that fast. If I were going to be running a boat at speeds over 50mph, and certainly those over 60 or so, I would want a bigger boat, like a 19 or 20'. I think they would be much more forgiving when "stuff" happens. Not saying those speeds can't be done in a smaller (16') boat. Just questioning the safety (wisdom) of doing that....

That said, the baby (16') Donzi's with I/O's powered by crazy hp small block V-8s have been doing this sort of thing for years. Just not my cup of tea........

Agree. It will require more attention than the campion Chase I have at those speeds. Had a few quick boats similar though. Ring 18 was about the wildest. U.K. bred race boat.
I have the motor mounted fairly sensibly at only about 1-2” high on the transom. Nothing too silly.

 

[QBhoy]

Well the pad is your salvation. All bets are off with that....you may see your aspirations!

Big guns on here used to flaunt 1" jack for every 6" of setback, not from the transom per se, but the aft extent of the wet hull, like some BB and other boats are offset (cut back) 6" in the hull before you put a jack plate on it.

My first bow lifting experience, where the boat left the water was a new 1989 17'6 Ranger Fisherman which was a Ranger style Bass Boat hull, but narrower, with a deeper V and the pad, rigged out for Back Trolling like they do here up North for Walleye and maybe Pike and Muskies, even Striped Bass, or crappie fighing brush piles down here. Bought it from a big dealer in Dallas.

Had an original Laser SS on a 115 "Tower of Power" and she was a 50+ boat On my shake down cruise, she started chine walking at 55 and I backed off the throttle. Didn't look at the tach as I was busy wondering "wondering where do I go from here). As I recall the Laser was a 24P which makes sense since that's what he put on his popular 150 HP Bass Boats and had them in stock....sold very few 115s. I took the prop back to him and he ordered and got in a Laser 19P for me as I recall, which I never took off and that engine had no problem seeing 6k with it and loved it. Being ported (ports were round and ⅜" recollecting, on the original Laser) I could hammer down on it in the hole and get a good, fast, shot, then up at a good speed as I was trimming out, the prop would lock in, the boat jolted when it did it and I took off.......grinning all the way.

I used to love to hear it singing and the blades of the prop hitting the water making a humming noise when I was hooked up and on the sweet spot. Trim sweet spot was out till RPMs started rising and speed started dropping off.....tucked back in slightly till the numbers went back to max.

Rangers had a pretty much zero tilt transom angle and had the 6" hull offset....inset really, so they could take the angle out of the transom which most mfgrs. have to get the LU out from the transom for less ventilation I guess. With the shallow transom angle you could get higher trim angles without running out of trim (the 20 degrees on Mercs). The other thing, as I see it, by having a deep V and the pad, once on the pad, the spray is clear to exit under the boat (out the sides) as there wasn't any hull in the way to deflect it helping to maximize MPH. That was my first boat that I felt lift off the water and had fun with it....didn't need to do any fishing, just play with it.

This wasn't a hot dog Cigarette go-fast boat or any of that....just a middle aged guy (at the time) with a new, stock, fishing boat experiencing things never experienced, having a great time.

Great account. I’ll go easy with her I think. She’s an old lady now. I’ll see how she runs with a 23/25” laser 2 for starters.
thanks again.

 

[JASinIL2006]

I have seen the "white light" as in " Go towards the light" twice in my life and don't want to see it again until it's my time. I don't want to go towards the light doing 120 MPH on the water.

I love the classic go fast boats, I just don't want to die in one. I forgot you are north of L'Engla Terre. Been once to Scotland, Troon, the hometown of my former wife's family for a big Family Wedding in the 80's. It rained so much that week we couldn't golf not even once. Kinda' like a randy teen invited to The Playboy Mansion and made to stand outside the front door. If I even smell Scotch today I get deathly ill. I think they served the new stuff.

[h=1]Nae wind, nae rain, it's nae golf[/h]

 

[Old Ironmaker]

[h=1]Nae wind, nae rain, it's nae golf[/h]

I always golfed in the rain, not when I need to wear SCUBA though. Yea wind, yea rain nae golf.

 

[JASinIL2006]

I always golfed in the rain, not when I need to wear SCUBA though. Yea wind, yea rain nae golf.

:lol::lol::lol: