P40 Boat speed

[Alex Butler]

Hi everyone, 

I posted the same question on the facebook group, apologies for double post..

Alex Butler on 1986 P40 Blue Moon. I am wondering what kind of real world speeds other owners are seeing and any suggestions. I'm 1-2 kts behind the polars, and the boat "feels" like it should be faster. For example, I'm doing around 5 - 5.5 kts with 13-15 kts on the beam.

I'm running a new 135 RF Genoa and main. I have a cutter rig & stay which I haven't tried yet, my theory being the boat wasn't sold as a cutter and the polars are without the stay. I have a fixed 3 blade prop.

I recently had a diver clean the bottom (questionable job) and that didn't seem to help any. I'm now considering:

• Hauling and pressure wash
• Hauling and bottom paint
• Max Prop (This Is outside my budget right now)

Any and all thoughts, comments, advice welcome!

Thank you

[John Baudendistel]

5 -5.5 kts.  That's about right for a P40 + or - with 13kts of wind.  All depends on how heavily the boat is loaded, bottom, sail condition trim and a host of other items.  Any current?  Boat speed or GPS?   Cutter would only make maybe 1/2 kt. difference and only going beam reach and up to 35 degrees into the wind pointing up wind.  The P40 was designed as a Sloop as you likely know.   

Same Beam reach same sails with 18-20 knots of wind do your reach 6-7kts of boat speed.  That would be hull speed.  

John

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[Rob Raymond]

Seems slow to me at 13 knots true. Our P40 will keep up with most boats on a beam reach. Switch out the fixed prop for a Maxprop and you'll add a knot to those speeds.

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[Rob Raymond]

I've only had feathering props, so I couldn't say which is better. We put a Kiwi Prop on our last boat, and while we saw a speed increase under sail, we also lost a half a knot while motoring.

On Fri., Aug. 20, 2021, 09:13 Alex Butler, <alexbu...@gmail.com> wrote:

@Rob, thanks for the validation on the max prop. You like that better than a folding prop? I’ll put it on my Xmas wish list.

@John, this is an average corrected for current, it’s about what I’ve observed through the water. To be fair the boat is heavily loaded, but other cruisers seem to be getting faster speeds, and the polars show 7.4 in 12 kts 90 deg apparent. I guess I’m wondering what I should try next of those variables you mentioned…is hauling and painting the bottom the most logical? 

[Michael Moradzadeh]

We put a Max Prop on Cayenne.  Worked great in forward and reverse, and good performance under sail.

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[Marty McOmber]

In 13 to 15 knots true wind on a beam reach we would be doing around 6.5 to 7  on our 1984 Passport 40. 

120 Genoa and a max prop. 

Perhaps a good rig tune would help?

Sent from my iPhone

On Aug 20, 2021, at 9:35 AM, Michael Moradzadeh <mic...@yachtpc.com> wrote:



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[Alex Butler]

@Rob, thanks for the validation on the max prop. You like that better than a folding prop? I’ll put it on my Xmas wish list.

@John, this is an average corrected for current, it’s about what I’ve observed through the water. To be fair the boat is heavily loaded, but other cruisers seem to be getting faster speeds, and the polars show 7.4 in 12 kts 90 deg apparent. I guess I’m wondering what I should try next of those variables you mentioned…is hauling and painting the bottom the most logical? 

On Fri, Aug 20, 2021 at 12:03 PM Rob Raymond <wind...@gmail.com> wrote:

[Jeff Beller]

One thing I don't think anyone has mentioned is:   New sails.

They are the engine of your boat.  Unless you have relatively new sails, your's probably aren't performing well anymore.  There's a reason the race boats use the best sails and replace them on a regular basis.  It makes all the difference, and polars are generally based on optimum sails.  

We recently replaced our 14 year old Ulman blue water sails.  They were structurally sound but didn't have the correct shape anymore and we were suffering the same, especially with any point of sail forward of the beam.  We were motoring a lot when we should have been sailing. 

The new sails are North 3DI nordac, which are probably the best cruising sails you can buy (and breathtakingly expensive!).  They are built using North's 3DI one piece membrane technology that all their racing sails have been using for the last 5-7 years.  They hold their shape much better and for longer than any panel built sail.  We are ecstatic with the improvement it made in our boat's performance.  We do sail to those polar performance numbers.  We are regularly sailing in 8 knots of wind, when we used to wait until we had 10-12 knots before rolling out the sails.

The point of this is not to push the North sails, but show that new sails can make a big difference.  There are a number of other quality sail offerings out there that will improve the sailing performance of any boat.  If the bottom is clean and you have a folding or feathering prop (we have a Max prop), then sails are the next thing to consider.

Jeff

S/V Journey

Ventura, CA

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