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 Post subject: Re: Re:
PostPosted: Thu Apr 07, 2011 8:30 pm 
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Location: St Pete/Islamorada
2320 pilothouse wrote:
grouperjim wrote:
Finally reached prop nirvana. For a 3 blader that is. I sold my rev 4 17 after installing a permatrim. The rev 4 was definitely the best 4 blader with its great stern lift. However the Permatrim solved the stern lift issue so I wanted to go back to a 3 blade for offshore cruising performance. The Mirage Plus 15.25x 19 was getting the job done but it really stunk down low and midrange which is the rev 4s bread and butter.

Today I tested a Mirage Plus 15 3/8 x 18. All I can say is this thing seems to be perfectly tuned to the 2320/f250. The engine sings like a turbine in the midrange as well as at cruise (4500rpm). The Mirage 15.25 x 19 would make the engine work a little harder than I liked as it ran a little louder and not quite as smooth.

Today's test:

100 gal fuel
2.5 people
200 lbs gear/ice/food

Conditions 5 knts on the nose, seas 1 ft tight chop.

25 mph 3700 rpm 3.1 mpg
30 mph 4100 rpm 3.0 mpg
35 mph 4600 rpm 2.7-2.8 fluctuating

WOT 46 mph 5900 easy - 6000 briefly

The best 3 blade prop I've tested. Engine sounds great with this prop. I'm done testing---out.

Selling the 19. check "For Sale"




hey jim,is the mirage plus a noticeable difference over the stock prop--f250

thanks

dave


i've seen the 2320/f250 come with the 15x19 black stainless and also the 15x17 black stainless. yes there is a big difference in handling and performance. IMO a 15 inch 3 blade with very little cup such as the stocks props, do not provide enough blade surface area and blows out more easily than a bigger 3 bld prop.

FWIW the Mirage 15.25x17 which has a fair amount of cup is a great rough wx heavy load prop if you like to cruise 25-28mph. the mirage 15 3/8x18 works for me because it gets me cruising 30+mph. on the left coast of FL you need to cover a lot of water to get to good offshore spots so this prop works for me. rev4 17 works great too. i run heavy so the 19 pitch rev 4 and mirage don't work well for me.

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 Post subject: Re: Parker hull/prop database
PostPosted: Thu Apr 07, 2011 9:19 pm 
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Location: Ocala, Fla.
Hey Jim,
You got your prop from Propgods, didn't you? Want to put the same on mine.

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 Post subject: Re: Parker hull/prop database
PostPosted: Fri Apr 08, 2011 10:46 am 
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Location: setauket,ny 11733
spending $550.00 for prop to hope its good is a little steep,your information was very informative

thanks you

dave

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 Post subject: Re: Parker hull/prop database
PostPosted: Fri Apr 08, 2011 1:56 pm 
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Location: St Pete/Islamorada
Flaff wrote:
Hey Jim,
You got your prop from Propgods, didn't you? Want to put the same on mine.


i've had a few boats and have purchased many props over the years from Ken. he is always a pleasure to deal with. if you have ANY issues with the prop whatsoever he will work with you.

that being said, i knew exactly what prop i wanted and found a different vendor online who sold me the prop for $385 which is quite a bit cheaper. but once it arrived at my door, it was mine and not going back.

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 Post subject: Re: Parker hull/prop database
PostPosted: Tue Apr 26, 2011 10:51 am 
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Location: setauket,ny 11733
hey jim what flo torq hub kit did you use--would you have the part number

dave

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 Post subject: Re: Parker hull/prop database
PostPosted: Tue Apr 26, 2011 4:22 pm 
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Location: St Pete/Islamorada
don't remember ............. just make sure you get the one for the 4 stroke. the 2 stroke kit is the same except for the thrust washer. while the 2 stroke thrust washer will work on the 4 stroke, the 4 stroke thrust washer is designed with a flange on the front of it.......sort of a tulip look to it.

all i have is a pic of the 2 stroke thrust washer.


Attachments:
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Library - 1047.jpg [ 44.87 KiB | Viewed 1102 times ]

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 Post subject: Re: Parker hull/prop database
PostPosted: Fri May 06, 2011 10:33 am 
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Location: setauket,ny 11733
hey jim did you remove any of the plugs on the prop

dave

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 Post subject: Re: Parker hull/prop database
PostPosted: Fri May 06, 2011 11:13 pm 
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played around with it a bit. got a bunch of plugs with the different size holes. in the end i liked the performance best with all the vents completely plugged.

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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Jun 25, 2011 3:58 pm 
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25 SE center console with new F250 (3.3 litre block) running a 15 1/4 x 19 Mercury Mirage wheel WOT 5950rpms at 50 mph. Cruise at 3700 rpms at 30 miles an hour. Anywhere between 3500 and 3700 rpms. is over 4 mpg. with the right seas and wind best was 4.5 mpg.


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 Post subject: Re: Parker hull/prop database
PostPosted: Fri Jul 01, 2011 12:01 pm 
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Jim:

You have clearly done quite a bit of leg work on the prop issues... I am having some problems, and was wondering if you might be able to lend an idea or two...

ALSO, IF ANY OTHER 2820 OWNERS HAVE HAD SIMILAR ISSUES, OR IDEAS, PLEASE LET ME KNOW...

I used to have a 2520, with 2 stroke, Yamaha 200's. Loved the boat, and never a problem.

I recently bought a NEW, 2820. It has twin, 4 stroke, Yamaha 250's. The props are the stainless, Yamaha, 21-T-15. This boat is much faster and much more efficient than my older 25 footer, but I HAVE SPUN PROPS TWICE IN LESS THAN A YEAR.... WITHOUT HITTING ANYTHING.

I am just now learning about props, and starting to think that I might have the wrong props for this application.

I spoke with PARKER, who told me that I have the proper configuration.
I spoke with YAMAHA, who told me that I have the proper configuration.

If everything is right, then why am I spinning props. I frequently travel 50-70 miles offshore. It is very nice to be able to cruise home at 35-40 mph, and get about 1.5 mph... but it sucks to think I can spin my prop out there, and have to come home at 10mph.

What research do you have (I HOPE YOU HAVE SOMETHING) for the 2820, with the Yamaha 250's and the props I have... I am thinking I need to go with a prop that has the Square Hub Technology -- and won't spin.

Thank you very much for any help or advice you can give.

Larry


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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Jul 02, 2011 3:02 pm 
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I just tried the 15 3/8 x 18 Mirage plus in fresh water it didnt work for me. Ran it for about a hour so If anyone would like to buy a one hour use prop. wwdogface@aol.com 8287791997


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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Aug 27, 2011 8:13 am 
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Jim -wanted to know what hole position is that motor ? What you did, testing those prop. was very helpful to all of us.
Thank you
Marty D.


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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Aug 27, 2011 9:08 pm 
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Location: St Pete/Islamorada
Marty D wrote:
Jim -wanted to know what hole position is that motor ?

Thank you
Marty D.


It is bolted in the top hole, deepest position. This is how it came from the factory. Tried raising the engine one hole. This resulted in a ventilated prop in certain following seas, so it I moved back to the top hole........no ventilation. It has been my experience that engines set back on a bracket require a deeper running position for the A/V plate than a non-bracketed boat due to the natural variability/turbulence that occurs between the motor foot and the stern which is a couple of feet fwd.

I will also add that another factor that affects my hole position is that my boat rides more level in the water than a factory hull due to using larger trim tabs (12x20w), and a permatrim which lifts the stern of the boat making up for the loss of hull-planing surface due to engine set back on a bracket. I also load the majority of weight on my boat amidship and further fwd for a better CG. The only thing that rides in the transom are buckets of bait/chum and other lightweight items. I also run with 100+ # of ground tackle in the anchor locker which includes 35 ft of chain, 22# delta anchor, 400ft 1/2 line, and a windlass. Running level gives the boat a better ride in the rough stuff, and improved handling.

Go here to see the boat running on plane 18-20mph in a verified 2-4 with and occasional 5 footer jumping up.

http://www.youtube.com/watch?v=fi768KVNa-U

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2016 2801


Last edited by grouperjim on Sun Nov 06, 2011 10:45 pm, edited 1 time in total.

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 Post subject: Re: Parker hull/prop database
PostPosted: Fri Oct 07, 2011 11:55 am 
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Posts: 450
Location: Santa Barbara, CA
Hey guys, I have another thread of my own going about my current prop issues, but I wanted to make a suggestion for this thread, since it is intended to be a "database" of sorts.

As we all know, posting a single number for MPH, GPH, and SOG can be pretty misleading - the numbers tend to jump around a lot, and single numbers don't really tell the whole story. What I'd find incredibly useful is to see other's performance numbers laid out in chart form (or just PM me the numbers and I'll create the charts for you). To collect the data, I run around looking at the gauges while my "assistant" writes numbers down on a clipboard. What I end up with is a sheet that looks like this:
RPM MPH GPH
3800 12.9 13
4300 18.1 16
4400 25.0 15

And so on with at least 50 or 60 data points at various RPMS. I make it a point to collect a bunch of data (even at the same rpm) because it helps create a good scatterplot diagram where you can begin to see a "picture" of the performance like these:

Image Image

(yes, I have a terrible problem with my prop slipping, I know - and I can't figure out why). What I'd love to see is more data on prop slippage from other 2320 owners (with bracket-mounted motors) to see how far I am from the "mean". It would also be very interesting to see what sort of difference (in terms of empirical data) the Rev 4 makes versus the Mirage Plus. Anecdotal evidence is great ("handles much better!") but I'm a data hound... :D

By the way, the prop slippage can be calculated with the following formula:
(((pitch x RPM)/(gear ratio x 1056))-mph)/((pitch x rpm)/(ratio x 1056))

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 Post subject: Re: Parker hull/prop database
PostPosted: Wed Sep 12, 2012 1:59 pm 
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1996 2320

Repowered with a Etec 250 transom mount.

With Full Tank and 6 people, and 100 lbs of gea, 47 mph at 5800 WOT


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 Post subject: Re:
PostPosted: Sat Dec 29, 2012 12:45 pm 
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Location: Pensacola, Fl.
Megabyte wrote:
I did a ton of prop testing in `05 and `06. Three blade, four blade, aluminum and stainless...

Right now my motor is wearing a Mercury Mirage Plus (17p) that I bought used. The previous owner had it tweeked with a little more cup, which I really didn't need... but so far it does pretty well.

The 'cruise sweet spot' for my 1997 Yamaha 225 OX66 is 4200 to 4400 rpms (when the Bay chop allows it). At 4400 she is running 27 kts with full fuel and 3 people aboard and burning 13 gph. I think that is pretty good for as much gear as I carry. :shock:


What is the dia. on that prop Kev?

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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Jan 12, 2013 7:11 pm 
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Location: Pensacola, Fl.
Black Painted Stainless..... I think it is a factory Yamaha Prop. 3 X 14 X 17

'95 2530..... 1/2 full of fuel [75gal] 4 people onboard and no extra weight.

'95 VX 250 Yamaha Carbed 2 stroke.

Maxed out
5400 RPM = 35MPH burning 23.3GPH = 1.6MPG

5000 RPM = 31MPH burning 20.4GPH = 1.6MPG

4600 RPM =27.5MPH burning 14.6GPH = 1.9MPG

4200 RPM = 24MPH burning 12.8GPH = 2.0MPG

4000 RPM =20MPH burning 11.4GPH = 1.8MPG




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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Jan 19, 2013 7:26 am 
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I raised the motor 2 holes from being all the way down. I didn't get all my data numbers yet. But it brought the RPM up 100 to 150 RPM. It now holds 5500 and bounces on 5600. It does not blow out when turned hard over in a turn.

I still think it needs a prop change.

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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Jan 19, 2013 8:06 am 
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It is this one Bobby...

viewtopic.php?p=88126#p88126

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 Post subject: Re: Parker hull/prop database
PostPosted: Mon Jan 28, 2013 10:14 am 
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Location: Pensacola, Fl.
We got some new numbers yesterday with a new prop to try.

'95 VX 250 2 stroke. 5 people onboard and tanks full [150gal]

Prop = Powertech 4 X 15 X 15

The boat came out of the hole better.
The prop gave the boat more stern lift and put the cavitation plate where it needed to run.

Top speed was

35.6MPH @ 5500RPM = 23.3GPH - 1.4MPG

28.5MPH @ 4500RPM = 15GPH - 1.9MPG

26.5MPH @ 4200RPM = 13.3 - 1.9MPG

23MPH @ 4000RPM =13.5GPH -1.8MPG


We had problems right after that. I believe there is a lot of trash in the fuel tanks and causing problems. The tanks are fixing to be emptied and cleaned.

Glad that at least the boat got these numbers, as I would have condemned the prop for poor performance.

The dependability can't be trusted in this boat so far.

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 Post subject: Re: Parker hull/prop database
PostPosted: Mon Jan 28, 2013 10:41 am 
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Will you use a tank cleaning service, or will you pull them and do it yourself?

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 Post subject: Re: Parker hull/prop database
PostPosted: Mon Jan 28, 2013 12:56 pm 
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I'm not going to pull them or use a service. I'll do it myself.

First we suck all the fuel out and into 5gal cans. I have a buddy that has a LOT of them. It will be run thru a Fuel filter funnel....then into the cans.

Next the tanks will be filled with water and sucked out over and over again.

Then a air will be blown into the tanks under extremely low pressure just to move some air and cause drying.

This is how a buddy of mine did it to another boat with the same problem. Dry Gas was added to the fuel for safe measure.

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 Post subject: Re: Parker hull/prop database
PostPosted: Mon Feb 25, 2013 4:05 pm 
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The numbers I posted above have fallen away. These boats are weight sensitive.

We got the motor running better than ever. It's of my opinion that we just ran out of motor. Boat is full of fuel. 148gal [usable] That is aprox 962lbs

I have a 3 X 15 X 16 to try.

It does me no good to get great mileage and then load the boat down like it was going offshore and it becomes a Pig.

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 Post subject: Re: Parker hull/prop database
PostPosted: Sat Mar 02, 2013 6:24 pm 
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Well it's better, but....nothing to really brag about.

This was a good day to test a boat. It was nasty out White caps all over the bay...wind blowing. Water blown up on the windshield many times. Center consoles should have stayed home. I know I wouldn't do it. But there was 3 out there in the 22ft range.

3 X 15 X 16

Boat full of fuel....[well close enough] 2 adults and 4 kids....[kids added together =225lbs]

The boat on slick water barely would hit 5000RPM.
It still stumbled out of the hole, but not near as bad.

The best was 4000RPM -1.8MPG- 25MPH That was it's average....It did change with the current which was out going tide and moving pretty strong. The MPG dropped as low as 1.4MHG

This seems to be the best prop that we have tried so far, but I'm not satisfied.

It did give me the stern lift again that we lost with the 3 X 14 X 17.

The cavitation plate was even with the surface.......Right where you want it.

This boat differently needs a trim gauge, so I don't have to keep turning my head and looking at the motor.

The 24 X 9 Bennett's had 20% flaps in them for the most part.


I would Love to try a Rev 4 - 14 5/8 or 14 1/2 X 15.

I think the smaller diameter would allow the motor to rev up, but the 4 blade would give the ass end the lift it needs.

All in all we learned some things and had a nice afternoon....The temps are dropping fast now. Supposed to go into the high 20's.

The granddaughters played house while we were dragging some Mann's Stretch 30's for some Redfish. Saw them on the screen, but no bite.

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 Post subject: Re: Parker hull/prop database
PostPosted: Sun Mar 03, 2013 11:49 pm 
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Location: Greenwood, Indiana & Charlotte Harbor, Florida
Are you considering using 2 props? One for loaded boat and off shore use and another one for daily use?

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