Minimum Planing Speed & tabs

Ekea

Ekea

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what is your minimum planing speed...

1. with engines trimmed all the way down and tabs fully up (not used)?
2. with engines trimmed all the way down and tabs fully down?
 
I can barely plane at about 15.7 knots, no tabs, twin 4-blade props.

It was 20 knots before the prop change.

new prop

So, many years ago I had a power tec OS4. It gave my boat better stern lift, hole shot, mid range cruising performance,better following sea performance and reverse at the dock. I repowered in 17 and had it on it. Then some thiefs decided they wanted the prop and took the motor too. My new...
www.greatgrady.com www.greatgrady.com
 
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Too many variables to give a simple answer. In addition, do you want to know the speed stay on plane or the time to get on plane?
 
With a light load and no tabs 8-9 mph. Never tried with full tabs. Naturally I would expect anyone to call BS, so here is the photo:
20230709_133501.jpg

Edit: Looks like I didn't have the engines tucked all the way in. I'll try to grab another photo next time out with engines all the way down.
 
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family affair said:
With a light load and no tabs 8-9 mph. Never tried with full tabs. Naturally I would expect anyone to call BS, so here is the photo:
View attachment 34757

Edit: Looks like I didn't have the engines tucked all the way in. I'll try to grab another photo next time out with engines all the way down.
Click to expand...

The speed to stay on plane is a function of the thrust as compared to the drag. The hull speed that relates to that thrust is a different variable. So all else being equal a four bladed prop would create more thrust at lower speed and the minimum speed to stay on plane would be lower

For the record, what is the source for the speed display? GPS data or pitot?
 
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seasick said:
So all else being equal a four bladed prop would create more thrust at lower speed and the minimum speed to stay on plane would be lower

For the record, what is the source for the speed display? GPS data or pitot?
Click to expand...
Yep, i was surprised when reading that a GW (or any other planing hull boat) can plane at 6-7 knots.
Well it is possible having a overpowered boat who can turn high pitch 4 blades but that is very uncommon.
Chris
 
Speed is coming from the GPS.
To support seasick's point, the Eco Enertia prop lifts the entire hull reducing drag. That and the 2005 270 only has an 18⁰ dead rise.
The combination makes it easy to plane and gives really good economy. My only struggle is to get the props to hook up consistently in confused chop. Hopefully a little cup will fix that, but I need to go down 1 pitch.
 
seasick said:
Too many variables to give a simple answer. In addition, do you want to know the speed stay on plane or the time to get on plane?
Click to expand...
speed to stay on plane. how slow can you plane with tabs up? then how slow can you plane with tabs down?
 
family affair said:
With a light load and no tabs 8-9 mph. Never tried with full tabs. Naturally I would expect anyone to call BS, so here is the photo:
View attachment 34757

Edit: Looks like I didn't have the engines tucked all the way in. I'll try to grab another photo next time out with engines all the way down.
Click to expand...
wow, thats really impressive. i fall off plane around 20 mph with 3 blade props
 
Ekea said:
wow, thats really impressive. i fall off plane around 20 mph with 3 blade props
Click to expand...
Yep, same with my Canyon and all other of mine or others boats i was on, planing speed was between 16 and 20 knots.
Slowest I could plane was my 30ft RIB at about 14 knots, but thats another hull and weight.

Chris
 
With the old f150s and SWS props, my minimum planing speed was similar to what you all are posting.
The port I frequent has an outer break wall speed limit of 10 mph. With the factory set up, I'd need to come off plane in the harbor, otherwise I was kicking up a huge wake and sucking gas. Now I can tuck the engines and stay on plane without the boat cops coming after me!
 
family affair said:
With a light load and no tabs 8-9 mph. Never tried with full tabs. Naturally I would expect anyone to call BS, so here is the photo:
View attachment 34757

Edit: Looks like I didn't have the engines tucked all the way in. I'll try to grab another photo next time out with engines all the way down.
Click to expand...
I had to do a double take on this pic; my Zukes had 93 hours yesterday!
 
family affair said:
Speed is coming from the GPS.
To support seasick's point, the Eco Enertia prop lifts the entire hull reducing drag. That and the 2005 270 only has an 18⁰ dead rise.
The combination makes it easy to plane and gives really good economy. My only struggle is to get the props to hook up consistently in confused chop. Hopefully a little cup will fix that, but I need to go down 1 pitch.
Click to expand...
Based on my readings, cup doesn't really help at low speeds ( actually revs). hmmmmm I think I should look that up again. I may be incorrect....
 
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seasick said:
Based on my readings, cup doesn't really help at low speeds ( actually revs). hmmmmm I think I should look that up again. I may be incorrect....
Click to expand...
I'm open to feedback. Coming out of the hole I can't trim up more than a ¼ without slip. I can't raise the bow much either. As stated before, certain chop conditions causes loss of traction up to about 30 mph. The prop gurus have advised to try cup and have been successful with other Zukes with Ecos having the same issue.
 
family affair said:
I'm open to feedback. Coming out of the hole I can't trim up more than a ¼ without slip. I can't raise the bow much either. As stated before, certain chop conditions causes loss of traction up to about 30 mph. The prop gurus have advised to try cup and have been successful with other Zukes with Ecos having the same issue.
Click to expand...
Can you explain exactly what you mean by 'can't tri, up more than a 1/4 without slip"? Are you experiencing ventilation , blow out, or actual slip? If slip, how do you know that?
Is trim up referring to the motor or the trim tabs? Does trim up mean what I like to call trim OUT?

What model zukes do you have?
Sorry for all the questions. I am having a hard time understanding your issue:(
 
seasick said:
Can you explain exactly what you mean by 'can't tri, up more than a 1/4 without slip"? Are you experiencing ventilation , blow out, or actual slip? If slip, how do you know that?
Is trim up referring to the motor or the trim tabs? Does trim up mean what I like to call trim OUT?

What model zukes do you have?
Sorry for all the questions. I am having a hard time understanding your issue:(
Click to expand...
Trimming the engines up/out - I can't go more than a ¼ up the scale without an issue. As far as what the prop is specifically doing, I don't know exactly other than I lose "traction." I don't know how to determine the difference between blow out and ventilation.
Df200 4 cylinders.
 
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