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Parker 2320 4 blade prop - It's on!

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Parker 2320 4 blade prop - It's on!

Old 12-30-2019, 06:29 PM
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Default Parker 2320 4 blade prop - It's on!

Good evening. I am trying to find one of you fine folks with a perfectly propped (with a 4 blade) 2320 with a 4.2 liter 300.
Mine falls off plane right around 25 mph and rides very bow high.
I hear people love permatrims, but I would love to leave that as a last resort. If the right four blade prop will lower planing speed and add stern lift, that would be ideal.
A run with full fuel, full livewell and 1/2 full(of water) fishbox shows a fairly well propped boat from the factory other than the issues mentioned. It's a Yamaha 15 1/2 x 17 SWSII SDS currently. I had it slightly overtrimmed to get the 5900 rpm. Level trim is at 5800.


Has anyone solved this already? Thanks in advance.



Last edited by SeaPro48; 04-10-2020 at 07:24 PM.
Old 12-30-2019, 07:13 PM
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I have the same hull. with a 4.2 liter F250 and a Yamaha 15 1/2 x 17 black painted stainless prop. My boat falls off plane right around 3300 rpm and the prop gives reasonable performance. I use my trim tabs when needed to keep the bow down.

Parker hulls tend to be stern heavy. Did you use trim tabs in the numbers reported? What is your fuel economy across the rpm range?

I would really like to try a Powertech OFS4 in 16 pitch. Mercury Rev 4 17 pitch is a popular choice for Parker 23 DV hulls and would probably be a good fit to your F300.
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Old 12-31-2019, 05:30 AM
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We own a 2520, but I can give you a little insight as to what we did. Parkerís are very stern heavy as mentioned above. I installed a permatrim. Greatly reduced our planing time, also the responds rapidly to engine trim and tab adjustments. Last year I installed a merc Rev 4 prop. More stern lift when coming up on plane. Better close quarters maneuvering and better fuel exonomy. I would start with at least the permatrim. See how it feels then do the prop. In the mean time, trim engine all the way down, put tabs 1/2 of the way down and trlhrottle up. This will help in the mean time to improve that.
Old 12-31-2019, 06:59 AM
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This is a common issue with Parker boats, and I have seen a number of reports of 4 blade props at least partially solving the issue. Some people also feel the motors are mounted low, and report better handling by raising the motor 1-2 holes. Permatrim would likely help, but personally I am hesitant to have to drill a bunch of holes in my motor for the install. ClassicParker.com has a whole section dedicated to props and tuning. Its kind of an inactive forum now, but there is a lot of good information archived there.
Old 12-31-2019, 08:23 AM
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Most are doing mercy rev 4 15-19p depending on the weight in stern and adding permatrim.

i have a 15p and permatrim and the boat drives entirely different from the yam prop.

the hole shot feels amazing but I loose a bit on the top end.
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Old 12-31-2019, 09:33 AM
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Have a 2008 2320 with a F250, run a very heavy boat and here is my experience.

Everything was stock before I did the following.

- raised motor 2 holes
- added OSI turbo 4 blade prop 15P
- added SE Sport hyrdofoil

My hole shot is 10x better, can plane at lower speeds. MPG cruise went up about .5, lost 2-3 mph on the top end but who cares about that.
Old 12-31-2019, 01:25 PM
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I bet the 4 blade prop will get you what you need. I switched to one on my 25í Parker and my ability to plane at lower speeds went up noticeably. I just called a prop guy and he set me up. Seemed like a very easy process.
Old 12-31-2019, 02:00 PM
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Many guys over at classicparker.com swear by benefits of a Permatrim. And you don’t lose any top speed. Less costly and no playing games with props. C-Dory guys use them a lot too. I’m tempted myself but hate to drill eight holes in each of my lower units.
Old 12-31-2019, 02:29 PM
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I have a 2320 extended cabin with a 225 Honda equipped with a permatrim. Unfortunately I cannot give any before and after reviews because I installed the permatrim immediately after purchase. What I can say is my vessel has very little bow rise(compared to previous vessels Iíve owned) on acceleration and Iím able to plane as low as 15-16 mph. Iím running a solas 14-1/2x15 prop and Iím looking for a better option as well. I am underpowered a bit and when fully loaded with fuel and gear I does take a bit to get on step. When Iím running lighter with a half tank of fuel I have no problem at all. I dream of a 300 on the back someday. When I purchased the vessel the motor was mounted all the way down. I raised it to the middle position and that reduced the bow rise as well. FYI if you do decide to try the permatrim route do not go with the plastic knock offs. In my local area I know a few guys that tried them and had the prop chew them up. Not sure exactly why it happened though. Reach out as well to the guys on classicparker.com, great group of guys there and eager to help.

Last edited by mheltun; 12-31-2019 at 02:45 PM.
Old 12-31-2019, 02:55 PM
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Here is a picture that my buddy took. We were returning from a offshore trip and Iím running about 30 mph.
Old 01-01-2020, 11:39 AM
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There were a few guys on classic Parker and bloodydecks that had prop info posted, but I couldn't do an apple to apple comparison.
The pic posted was with tabs full up.
It wants to fall off plane at 25mph with tabs down and engine trimmed down.
I really didn't want to drill holes in the AV plate, but I have never heard a bad word or regrets about a permatrim install..
I would like to run slower without having to bury everything, and have all that drag.
Old 01-01-2020, 11:42 AM
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Originally Posted by flyhigh123 View Post
Most are doing mercy rev 4 15-19p depending on the weight in stern and adding permatrim.

i have a 15p and permatrim and the boat drives entirely different from the yam prop.

the hole shot feels amazing but I loose a bit on the top end.
Which motor /hull do you have?
It sounds like you have it figured out.

Old 01-02-2020, 12:10 PM
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I have a 2012 F250. I havent tried raising the outboard a hole, but tempted to try that. I'm on the west coast and i have a 60 gallon bait tank. I havent tried the 17p, but will try that sometime, but the 4 blade merc rev will feel good.

I first added a permatrim with the stock yam, it helped plane a bit better, but i was still too heavy. I then switched to a mirage plus 17p and it helped a little, but not too much. Once i went to the 4 blade, the boat feels more like its floating on top of the water as opposed to slicing through.
Old 01-02-2020, 12:20 PM
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Out of curiosity how much did you lose on the top end when you went to the 4 blade?
Old 01-02-2020, 04:26 PM
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Originally Posted by flyhigh123 View Post
Once i went to the 4 blade, the boat feels more like its floating on top of the water as opposed to slicing through.
Thanks, that's exactly what I am looking for.
Old 01-02-2020, 05:42 PM
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Originally Posted by mheltun View Post
Out of curiosity how much did you lose on the top end when you went to the 4 blade?
I think 2-3 mph. I forget. Itís hard for me to go max speed for long times as the Parker pounding slows you down lol
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Old 01-02-2020, 05:53 PM
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Originally Posted by flyhigh123 View Post
I think 2-3 mph. I forget. Itís hard for me to go max speed for long times as the Parker pounding slows you down lol
thx. Iím torn on a direction (staying with a 3 blade or going to a 4) because my max speed is about 37 mph and I cruise about 27 mph. Rarely am at WOT and Iím already at a disadvantage with a 225. Iím worried a 4 blade would drop my speeds too low.
Old 01-02-2020, 07:08 PM
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Most people say that a 4 blade drops top a little but also boosts mid range speed.
Slower at WOT by a couple mph but faster by as much or more at mid range RPM.
If I can gain 2 mph at 4000 rpm by loosing 2 mph at 6000 rpm, it's easy choice between them for me.
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Old 01-03-2020, 11:45 AM
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Bass guys have a little different design serves similar purpose without the huge whale tail look.

No personal experience, just sharing.

http://www.drew-tek.com/parts/product/bailey-hydrofoil/

Chris bailey versus Bryan's hydrofoil

Chris Bailey Hydro Foil hardware question
Old 04-03-2020, 06:43 PM
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Originally Posted by mheltun View Post

Here is a picture that my buddy took. We were returning from a offshore trip and Iím running about 30 mph.
That looks like the boat is running fairly flat.

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