Classic 16 RPM/ MPH

[dfunde01]

I took the Classic 16 out on Lake Lanier Sunday for her maiden voyage. Following the break in routne is a trip. Don't idle under 1500 or exceed 75% for the first 10 hours. Those that know Lanier know the confused chop and swells that exists off of Holiday Marina on a sunny Sunday. Power is the 4.3 MPI Merc with a Merc 21P Vengeance SS 3 blade prop. Could run dry, a little spray, and fairly comfortably at 2500 40 MPH with moderate porporising and what felt like a little ocassional air.

I am really looking forward to playing on some smooth water.

Is this a reasonable setup?
What should I expect for WOT rpm with this setup?
Should I consider other props?

Dave

[Rootsy]

yes to considering other props...

2500 rpm and 40 mph ... that speedo is pretty optomistic...

WOT will probably be around 4700 - 4900 with speeds in the 55 - 57 mph range...

[Sam]

Ditto to what Jamie said !

[dfunde01]

I though the speedo was a little on the giving side too. But at 2500 she was solidly on plane and riding the chop. I'll get some GPS numbers when I have some smooth water. What other props should I consider and what are the advantages over the Vengenance?

Dave

[Sam]

Try a turbo, better over all performance.

[MOP]

You will find that you speed is not much higher then your tach reading, 2500 about 26-27MPH 5000 52-54MPH give or take with a V6, V8 everything perfect maybe 57 to 60 depending on stock HP. There are a few that violate that EH! Rootsy, Bill Nagy and a few others.

Phil

[Sea Biscuit]

dave
here is my prop set-up on my 2001 v8 240 hp efi 16.
currently run a turbo 24p 14-1/2 dia.that runs 60.2 gps/62-63mph on the speedo with a full tank of gas and 2people 4850rpm. so-so stability, some porposing, some chine walking.
next i tried a 4blade 23p quad4x 15-1/2 dia. hydromotive. 60/61 on (speedo) 1/2 tank of gas and one person 4900rpm. very stable no porposing and no chine walking but it would cavitate coming out of a turn and hard straight line accel.
now i have have a power teck 4 blade 23p 14-1/2 dia.from throttle up(julie 727-531-2255) that i have not tried yet. i'll let you know how it works.

Lee

[dfunde01]

Lee,

If I plan on pulling a skier, wake board, etc. would moving up to a 23P or 24P have enough of a hole shot? I'm surprised that a different prop would eliminate porposing and chine walking. I think I do understand how a four blade prop would cavitate more. Are the four blade props generally more stable and do they all have increased cavitation? In my first run in the nasty chop on Lanier Sunday with the 3 blade Merc Vengance three blade 21P I had no cavatition, but moderate porposing. I've been out of boating for about 20 years and the technology has passed me by. I found the folowing articles on chine walking trying to educate myself. They are probably old hat to you guys, but I thought I'd share.

http://www.bassboatcentral.com/new_page_2.htm

I look forward to attending a function where I might have the opportunity to try some different props. I'll post the results of my first smooth water runs.

Dave


dave
here is my prop set-up on my 2001 v8 240 hp efi 16.
currently run a turbo 24p 14-1/2 dia.that runs 60.2 gps/62-63mph on the speedo with a full tank of gas and 2people 4850rpm. so-so stability, some porposing, some chine walking.
next i tried a 4blade 23p quad4x 15-1/2 dia. hydromotive. 60/61 on (speedo) 1/2 tank of gas and one person 4900rpm. very stable no porposing and no chine walking but it would cavitate coming out of a turn and hard straight line accel.
now i have have a power teck 4 blade 23p 14-1/2 dia.from throttle up(julie 727-531-2255) that i have not tried yet. i'll let you know how it works.

Lee

[Rootsy]

very very mild chinewalk... in a 16... with a short drive (alpha SS) and a 4 blade hydromotive QIV O/T at 72ish mph... st. clair river...

http://my.tdi.net/~jaroot/16classic.wmv

[dfunde01]

Great video clip. I really like your color scheme;>). I could really sense the touch of chine walk and appreciate how nasty it could be if it accelerated. What and who was running with you? Am I safe in assuming that chine walk will not be an issue on a 16 under 60MPH? On my Sunday first run my passengers hand on the grab rail blocked my view of the tach. In the video your tach is on the right with the speedo on the left, the opposite of mine from the factory. Did you switch yours? So much to learn.


very very mild chinewalk... in a 16... with a short drive (alpha SS) and a 4 blade hydromotive QIV O/T at 72ish mph... st. clair river...

http://my.tdi.net/~jaroot/16classic.wmv (http://my.tdi.net/%7Ejaroot/16classic.wmv)

[Rootsy]

gauge layout is as delivered, i replaced the VDO's with Autometers.

Goatee from the board was shooting the video from my passenger seat.

the boat on the right that i am passing :biggrin.: is doug lovins (DOUGL on the board) in his 87 18 classic... with nearly identical power and drive setup... we run pretty much even but the 18 is an entirely different animal when ti comes to stability...

my boat chinewalked like a MOFO in stock form with a 19P merc vengence... at 54 mph... a merc vengence is basically an aluminum prop made of stainless from what i've been told.

JR

[Sea Biscuit]

dave

- my turbo 24p jumps right up with a 200 pound skier, the turbo does have vents though.
- the turbo does chinewalk 50 and up
- i guess i expected a 4 blade to cavitate less not more, throttle-up claims this new powerteck 4 blade might correct that issue.

lee

[dfunde01]

Lee,

My thought was that a four blade prop has more blade surface churning the same amount of water and would therefore be more prone to cavitate. With the porposing and chine walking issues that appear to be inherient in the 16 I am surprised that Donzi doesn't do a better job of matching the prop to the engine set up at the factory. Rootsy said that his was delivered with a 19P and mine came with a 21P SS Merc Vengenance. I would expect Donzi to be more concerned about delivering the most stable package. Getting into chine walk at 50 MPH concerns me as I have been told that you can't accelerate through it safely.

Dave



dave

- my turbo 24p jumps right up with a 200 pound skier, the turbo does have vents though.
- the turbo does chinewalk 50 and up
- i guess i expected a 4 blade to cavitate less not more, throttle-up claims this new powerteck 4 blade might correct that issue.

lee

[Sea Biscuit]

Dave
I've found the best way to settle down chinewalking is a slight turn to the right and it would go away. Others like Sam and Jamie may have other teckniques but this seems to work on my stock 16.
Lee

[dfunde01]

Lee,

Thanks for the tip. A little pressure on the steering would stabilize the outdrive. Is chine walking only and issue with out drives or can it also be a problem with a V drive?

Dave

[tmdog]

Do you have a V-drive? I have a few parts for one.

[Doug L.]

the boat on the right that i am passing is doug lovins (DOUGL on the board) in his 87 18 classic... with nearly identical power and drive setup... we run pretty much even but the 18 is an entirely different animal when ti comes to stability...




Jamie,
You need to come to KY and try that again!!!!
Doug :wavey:

[Sam]

I'll pay to see that one :biggrin.:

Sam

[Rootsy]

hell, no problem you two... if we run long enough you'll both slow down from all of those leaks and probably sink. :eek:

JR

[Ranman]

hell, no problem you two... if we run long enough you'll both slow down from all of those leaks and probably sink.

If they're not dragging you in with a busted gearset. :biggrin.: :biggrin.:

[Rootsy]

If they're not dragging you in with a busted gearset. :biggrin.: :biggrin.:

at least i don't have some lame ass excuse like "I RAN OUT OF GAS" :wink:

seems like you had a case of the drizzlies once too... :stan:

JR

[Sam]

Rough crowd here :uzi: I'm going back to my gilrly drink :beer: .

Sam

[Ranman]

at least i don't have some lame ass excuse like "I RAN OUT OF GAS"

Yup. Happens to the best of us. If you boat long enough, you will break down... :D :D

[Sam]

Randy, I love your drinking mates (LOL).

[sweet 16 1966]

I have a 66, 16' with a stock 302 4bbl running a 19 pitch X 13 1/2" old quicksilver prop. Great pulling power, no cavitation runs 4800-5100 rpm's depending on fuel and passengers. Not sure of top end - likely low to mid 50's. Would like to increase speed but do not want to sacrifice the boats skiing abilities or the boys would protest! Would like to try a 21 but the 14 1/2" props rerquire removal of the trim tab which allows me to trip wide open and have zero play on the steering wheel. I also control chine walk with slight steering.

[mattyboy]

I have a 14 1/2 X 21 spinelli that is great for skiing, depending how big the boys are I pull large out of shape people right up sometimes even pull shoulders out of the socket of people with too much surface tension ;)

the 21 pitch should not effect hole shot that much

I have since moved to a 22 ultra and worked out some steering issues hole shot is still there top end has not been gps yet but I would say solid 55 and have not tested a 25 pitch chopper should get me high 50's

no chine walk with the spinelli just gunwale jumping you'll see that on the video has I get on her the ultra is like it is on rails

67 16 351 w 310 hp volvo 250 1.61:1

here's a link to the video of my hole shot with the spinelli
http://www.donzi.net/video/summer04_0001.wmv

[BigGrizzly]

dFun, Drop by my lake house by Warhill parlk on Taylor creek and we will go for a Gps ride. and we can prop your boat and put you at ease with the boat. I have had a 16 since 1966 and at the lahe we have the Corsican and the Criterion. Stop by and chat.