Official 19SPX/21SPX/SPX190/SPX210 Thread

[fg3]

Took our boat out for the first time this weekend. Rode really well. Scared the kids a bit with some turns on plane. I love the way this boat cuts into the turns. Way more aggressive than the glastron we had.

FG3 any news on the prop? As we are in our first 10 hours of break in I only had it up to ~3000 rpm and 30 mph.


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Glad to hear you got the boat out! I agree that handling is a blast!

Regarding the prop, I ordered a 19P High Five - should be arriving tomorrow.

Was your speed based on the speedometer or GPS? Also what pitch is your prop and what drive ratio leg do you have? The reason I ask is because with a 19P prop and a 1.81 leg, 3000 RPM and 30MPH is < 0% slip, which is impossible. I'm at 20% slip all out with my 19P Black Max prop (meaning at 4800 RPM, I'm hitting 80% of the 47.7MPH indicated in the chart below).

See the spreadsheet I put together below for theoretical max speeds at various RPMs:

 

[Dizzy]

Glad to hear you got the boat out! I agree that handling is a blast!

Regarding the prop, I ordered a 19P High Five - should be arriving tomorrow.

Was your speed based on the speedometer or GPS? Also what pitch is your prop and what drive ratio leg do you have? The reason I ask is because with a 19P prop and a 1.81 leg, 3000 RPM and 30MPH is < 0% slip, which is impossible. I'm at 20% slip all out with my 19P Black Max prop (meaning at 4800 RPM, I'm hitting 80% of the 47.7MPH indicated in the chart below).

See the spreadsheet I put together below for theoretical max speeds at various RPMs:

Lol. All data is approximate. I did have GPS on and it was 28-30 mph. The numbers I gave were down stream in a strong current with a 10 mph sustained wind at our back. I wasn't watching the RPM too closely. How much does the altitude affect your numbers? I'm at ~700 to 900 feet above sea level.


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[Jeremygavin]

You are correct sir. I ordered the kit today. I can verify most sections except the middle sections of your swim platform. ( I have the OB Version) I can mail you the kit when I'm done if you want to check those. And since Jeremy has the same boat as mine, I'll verify fit for him on the peices he wants. Brian

Brian,
Did you get the Seadek pieces for the hatch and step yet? If so did their template fit well?

 

[Bridog]

Brian,
Did you get the Seadek pieces for the hatch and step yet? If so did their template fit well?

Hi Jeremy. Some of the pcs fit but the 2 that I really wanted (like you) did not. They had to be changed as well as the teak lines so they would match up with the existing section. SeaDek messed up the first dry fit I sent in so it had to be redone. I just got the second revised drawing back and hope to get the new one soon. Long process that started in Feb. I'll keep you updated and post pics when I get it. Take care, Brian

 

[Jeremygavin]

Hi Jeremy. Some of the pcs fit but the 2 that I really wanted (like you) did not. They had to be changed as well as the teak lines so they would match up with the existing section. SeaDek messed up the first dry fit I sent in so it had to be redone. I just got the second revised drawing back and hope to get the new one soon. Long process that started in Feb. I'll keep you updated and post pics when I get it. Take care, Brian

Thanks for the update. Pics when you are done would be great. My 340da is going in on Friday so now I want to focus on the 19spx and get it ready for the season.

 

[fg3]

Lol. All data is approximate. I did have GPS on and it was 28-30 mph. The numbers I gave were down stream in a strong current with a 10 mph sustained wind at our back. I wasn't watching the RPM too closely. How much does the altitude affect your numbers? I'm at ~700 to 900 feet above sea level.


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No doubt. But it's helpful for me at least to see what an Engine/Prop combo. can do and how simple this all really is. Also I'm a geek so the more data the better.

Great question about the altitude - here's my take on it:

HP Loss = (elevation x 0.03 x horsepower @ sea level)/1000

So if our engine is making 200 HP at sea level, it's making 168 HP where I run at 5300'.

Now here's where my understanding/logic may go sideways, so if anyone knows otherwise, let me know:

The engine at 5300' still has enough power to turn a 19P prop at it's max rpm of 4800. So all other things being equal, my speed should be the same as the same boat running a 19P prop at 4800 rpm at sea level (you'd probably be able to overrev however).

Now - having less power across the entire rpm band, I'd guess that I would definitely feel a difference (decrease) in hole shot, acceleration, etc vs. being at sea level. Also, at sea level you could probably move to a 21P prop and have a similar hole shot, acceleration, etc to what I achieve with a 19P at elevation and the added bonus of higher top speed.

I installed the Vesselview mobile module last weekend - so next time I get the boat out I'll get some even more detailed numbers on hole shot, WOT rpm and speed, etc.

 

[SCJeep]

Here is my newest upgrade, bow filler cushion. I made it to the contrast accent color or closest I could get because we couldn't match the primary color at my upholsterer.

 

[Bridog]

Here is my newest upgrade, bow filler cushion. I made it to the contrast accent color or closest I could get because we couldn't match the primary color at my upholsterer.

Nice Upgrade. Looks great.

 

[Dizzy]

Here is my newest upgrade, bow filler cushion. I made it to the contrast accent color or closest I could get because we couldn't match the primary color at my upholsterer.

Looks fantastic! How is it supported underneath?



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[Dizzy]

No doubt. But it's helpful for me at least to see what an Engine/Prop combo. can do and how simple this all really is. Also I'm a geek so the more data the better.

Great question about the altitude - here's my take on it:

HP Loss = (elevation x 0.03 x horsepower @ sea level)/1000

So if our engine is making 200 HP at sea level, it's making 168 HP where I run at 5300'.

Now here's where my understanding/logic may go sideways, so if anyone knows otherwise, let me know:

The engine at 5300' still has enough power to turn a 19P prop at it's max rpm of 4800. So all other things being equal, my speed should be the same as the same boat running a 19P prop at 4800 rpm at sea level (you'd probably be able to overrev however).

Now - having less power across the entire rpm band, I'd guess that I would definitely feel a difference (decrease) in hole shot, acceleration, etc vs. being at sea level. Also, at sea level you could probably move to a 21P prop and have a similar hole shot, acceleration, etc to what I achieve with a 19P at elevation and the added bonus of higher top speed.

I installed the Vesselview mobile module last weekend - so next time I get the boat out I'll get some even more detailed numbers on hole shot, WOT rpm and speed, etc.

Did you have to put in a dongle on your engine to use vesselview? Be interested with the numbers.

I'll pay more attention to our numbers when we get out next.


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[Bridog]

How much does the altitude affect your numbers? I'm at ~700 to 900 feet above sea level.


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fg3, I'm curious as well. I thought that boats sold to high altitude customers also had different gear ratios as well to make up for the drop in power. So dropping prop pitch accomplishes the same results? Brian

 

[SCJeep]

I had a piece of 3/4" Starboard cut to fit in the grooves. This is HEAVY but provides great support.

The cushion was then mounted to the top of the board. This gives it a nice clean look and I didn't have to modify the boat whatsoever. You do have to pop the seat cushions out in order to put the bow cushion in but its only a small inconvenience.

 

[Dizzy]

Did you have to put in a dongle on your engine to use vesselview? Be interested with the numbers.

I'll pay more attention to our numbers when we get out next.


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I was at 28.5 to 28.9 mph (up vs down stream) at 3000 rpm. Some chop. Light wind 3-4 mph


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[Dizzy]

I was at 28.5 to 28.9 mph (up vs down stream) at 3000 rpm. Some chop. Light wind 3-4 mph


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I forgot to mention speed is gps. The speedo lied and said 30 on the nuts. Guess I know my speedo is a few mph off.


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[Dizzy]

You all have me thinking about vesselview now. Anyone consider using an ipad mini (or equivalent) and mounting it on the dash? You could run the vesselview an apps like navionics on it and use it to stream music

 

[MD185SportGuy]

I use VVM on an iPad Mini 4 with Navionics and such in split screen on my 185. It works like a charm.

The VVM app is in its infancy, but the support is top notch. It currently does not support landscape mode, but that is coming from what i have been told.

 

[skibum]

MD185 - Where do you boat? I work in Germantown. You obviously need to drive to the water. Just curious...

 

[Dizzy]

I use VVM on an iPad Mini 4 with Navionics and such in split screen on my 185. It works like a charm.

The VVM app is in its infancy, but the support is top notch. It currently does not support landscape mode, but that is coming from what i have been told.

How do you have it mounted?


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[Dizzy]

So had the boat out a few times. Taking the boat into the dealer for some warranty work. So far a broken snap on the front center cushion, the bemini on the tower isn't level, and there seems to be a pressure leak in the trim hydraulics (engine drops an inch a day). Other than that it has been great!

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[MD185SportGuy]

MD185 - Where do you boat? I work in Germantown. You obviously need to drive to the water. Just curious...

Either Lake Anna, the Potomac (put in at Gravelly Point) or the bay (put in at Sandy Point). I've been to Deep creek a few times but it's not really worth the drive to me.