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Old 07-12-2019, 11:01 AM   #1 (permalink)
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RSWORDS Paging RSWORDS... prop?

I have an aluminum 21x14 prop on my 19 ft. Tracker Targa,
I also have a Stainless 21x13 3/4 prop with it,
Which will gain more speed?
Currently runs about 42 mph with the 21x14 aluminum prop.

I just installed the stainless 21x13.75 prop, but haven't had time to take it out yet.

I know it's not going to be a huge difference
but what I have read is that stainless will flex less and should be faster if they're the same size but they're not exactly the same.

Usually I get about 5400 RPM's @WOT before it starts sucking air at the prop while trimming the motor up and then the RPM's go up even more while sucking air.
It might not make any difference in props if it's sucking air at 5400 RPM's
hellifiknow

TIA

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Old 07-12-2019, 11:21 AM   #2 (permalink)
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If you have both then put the other one on and see for yourself
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Old 07-12-2019, 11:26 AM   #3 (permalink)
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We have a few days scheduled off and we're going out of town in 2 weeks,
I'm curious which prop will get me mo faster,
I don't want to work on my boat while we're there
and take a chance of someone stealing my spare prop while we're out on the water or have it cluttering up the boat storage space.
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Old 07-12-2019, 11:31 AM   #4 (permalink)
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Quote:
Originally Posted by jblack View Post
I have an aluminum 21x14 prop on my 19 ft. Tracker Targa,
I also have a Stainless 21x13 3/4 prop with it,
Which will gain more speed?
Currently runs about 42 mph with the 21x14 aluminum prop.

I just installed the stainless 21x13.75 prop, but haven't had time to take it out yet.

I know it's not going to be a huge difference
but what I have read is that stainless will flex less and should be faster if they're the same size but they're not exactly the same.

TIA
the uminum prolly flexes to match the pitch of the stainless
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Old 07-12-2019, 11:35 AM   #5 (permalink)
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the uminum prolly flexes to match the pitch of the stainless
Both are 21 pitch
aluminum is 14 inches and the stainless is 13.75 inches.
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Old 07-12-2019, 11:57 AM   #6 (permalink)
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Maybe the stainless stretches out to 14"
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Old 07-12-2019, 12:09 PM   #7 (permalink)
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Put them both on, one behind the other so it goes twice as fast. Use epoxy if necessary. Take video. Report back.
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Old 07-12-2019, 12:20 PM   #8 (permalink)
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Offer both props outrageous amounts of money to go faster. Whichever one takes the most money will go the fastest.



Isn't that how boats work?
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Old 07-12-2019, 12:24 PM   #9 (permalink)
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There's another piece or 2 of of prop performance you're missing- what are your revs at Wide Open Throttle (WOT). And another factor is the prop blade design/ manufacturer.

Ideally your prop would allow you to hit the rev limiter on flat water with a lightly loaded/ empty boat when trimmed out (optimal trim for speed/resistance).

Theoretically, the smaller diameter prop should allow the motor to spin faster since there is less blade surface area ( assuming like-kind prop design.) { there is less resistance due to smaller 'paddles' pushing less water}.

The smaller diameter may also make a difference in time to plane & speed of acceleration (due also to smaller blade surface area)

I have swapped diameters from 13.25 to 14" both stainless, same OEM manufacturer in the same pitch and knocked a couple hundred RPM's off the top end and improved holeshot/ torque down in the low rpm's.

An optimized prop setup will hit the motors wide open throttle spec or close to it light and return a ~12-15% slip ratio calculation. https://www.mercuryracing.com/prop-slip-calculator/
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Old 07-12-2019, 12:38 PM   #10 (permalink)
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We have a few days scheduled off and we're going out of town in 2 weeks,
I'm curious which prop will get me mo faster,
I don't want to work on my boat while we're there
and take a chance of someone stealing my spare prop while we're out on the water or have it cluttering up the boat storage space.
Huh? Your spare prop should be in the boat along with the tools needed to change it.
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Old 07-12-2019, 12:46 PM   #11 (permalink)
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Huh? Your spare prop should be in the boat along with the tools needed to change it.
If the prop gets busted then my trolling motor will get us to our destination or nearest ramp and I'll call my brother and have him pick up my son who will bring the tow vehicle to the nearest ramp and there's plenty of those,
Lake Cumberland is a big lake with lots of ramps. We use the boat for mostly pleasure but it's pretty much a walleye boat with dual consoles and very deep sides.

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Old 07-12-2019, 03:03 PM   #12 (permalink)
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If the prop gets busted then my trolling motor will get us to our destination or nearest ramp and I'll call my brother and have him pick up my son who will bring the tow vehicle to the nearest ramp and there's plenty of those,
Lake Cumberland is a big lake with lots of ramps. We use the boat for mostly pleasure but it's pretty much a walleye boat with dual consoles and very deep sides.
none of these provides a rational reason not to carry the spare prop and wrench so that you could just swap props at the nearest ramp and continue your day on the water.
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Old 07-13-2019, 04:25 AM   #13 (permalink)
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none of these provides a rational reason not to carry the spare prop and wrench so that you could just swap props at the nearest ramp and continue your day on the water.
Probably not but if the prop gets broke then I'm ready for home anyway...
cuz I gots to get a new prop.
But seriously if my prop gets broke, my day on the water is over anyway...
My mood is not going to be for the water after that.
I'll want to get home and see what's the best deal I can get on a prop.
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Old 07-13-2019, 05:20 AM   #14 (permalink)
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Meh, you can change a prop on the water easily enough unless it is an inboard. Then your day on the water can continue.
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Old 07-13-2019, 10:09 AM   #15 (permalink)
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Probably not but if the prop gets broke then I'm ready for home anyway...

cuz I gots to get a new prop.

But seriously if my prop gets broke, my day on the water is over anyway...

My mood is not going to be for the water after that.

I'll want to get home and see what's the best deal I can get on a prop.


So if you get a flat tire out wheelin....
You wanna go home....
Go home....
You wanna go home??????


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Old 07-13-2019, 11:58 AM   #16 (permalink)
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What props are they? Different designs of the same pitch run completely different.

I have 3 different props of the same pitch for my boat and depending on what I am doing I'll put the appropriate one on.

Try em and see. Usually the stainless will have all around better performance then aluminum
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Old 07-13-2019, 12:07 PM   #17 (permalink)
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I don't want to work on my boat while we're there
Good luck with that!

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Old 07-13-2019, 12:18 PM   #18 (permalink)
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Probably not but if the prop gets broke then I'm ready for home anyway...
cuz I gots to get a new prop.
But seriously if my prop gets broke, my day on the water is over anyway...
My mood is not going to be for the water after that.
I'll want to get home and see what's the best deal I can get on a prop.
If swapping a prop ruins you day you need a new hobby. Lol
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Old 07-13-2019, 06:44 PM   #19 (permalink)
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So if you get a flat tire out wheelin....
You wanna go home....
Go home....
You wanna go home??????


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If swapping a prop ruins you day you need a new hobby. Lol
If I break a prop and need to change it,
"meaning I need to buy a new one"...
That will ruin my day.

Plan on trying out the stainless tomorrow...
and taking the aluminum prop as well...


Whether 1 person or 4 people it runs 42/43 mph
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Old 07-13-2019, 07:34 PM   #20 (permalink)
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Whether 1 person or 4 people it runs 42/43 mph
That sounds suspicious.

1) What motor is on your boat and 2) what revs are you turning at Wide open throttle?



This is a similar boat to yours topping out at 47mph with a 16 pitch prop, so you've got something funky going on if you're topping out at 43 both loaded down or light with a 21 pitch.

The similar size & dry weight of this boat would highly suggest you're over propped at 21pitch.

https://yamahaoutboards.com/en-us/ho...xb_5-31-19_wal
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Old 07-13-2019, 08:08 PM   #21 (permalink)
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That sounds suspicious.

1) What motor is on your boat and 2) what revs are you turning at Wide open throttle?



This is a similar boat to yours topping out at 47mph with a 16 pitch prop, so you've got something funky going on if you're topping out at 43 both loaded down or light with a 21 pitch.

The similar size & dry weight of this boat would highly suggest you're over propped at 21pitch.

https://yamahaoutboards.com/en-us/ho...xb_5-31-19_wal
Damn, Can't believe I hadn't posted that

Mercury 150 Optimax

Runs about 42/43 mph at 5400 RPM and while trimming it up then it raises RPM's and starts sucking air at the prop. so I trim it back down until it quits sucking air at the prop.

I plan on hitting the lake tomorrow and see what the SS prop does for it.

When I bought the boat the PO said he used SS prop for pulling tubes and skiers. He bought the boat new...

If I give it almost full throttle from idle, it will damn near jump straight out of the water, like a leap frog.

I've owned the boat for just over 2 years and never tried the SS prop that came with it.
The boat get used just about 2 times per month and sometimes every weekend if the weather allows.
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Old 07-13-2019, 08:21 PM   #22 (permalink)
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Damn, Can't believe I hadn't posted that

Mercury 150 Optimax

Runs about 42/43 mph at 5400 RPM and while trimming it up then it raises RPM's and starts sucking air at the prop. so I trim it back down until it quits sucking air at the prop.

I plan on hitting the lake tomorrow and see what the SS prop does for it.

When I bought the boat the PO said he used SS prop for pulling tubes and skiers. He bought the boat new...

If I give it almost full throttle from idle, it will damn near jump straight out of the water, like a leap frog.

I've owned the boat for just over 2 years and never tried the SS prop that came with it.
The boat get used just about 2 times per month and sometimes every weekend if the weather allows.
Hows the engine height? If tour numbers are correct you have stupid ass high calculated slip. Like mid 20s high. You may have a setup issue

You could also gain some wot RPM. I'm curious to see what the stainless does. And what brand/model stainless is it?
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Old 07-14-2019, 06:30 AM   #23 (permalink)
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Hows the engine height? If tour numbers are correct you have stupid ass high calculated slip. Like mid 20s high. You may have a setup issue

You could also gain some wot RPM. I'm curious to see what the stainless does. And what brand/model stainless is it?
The engine looks like it has been raised one set of holes,
it has 5 sets of height adjustment holes and it looks like that it has been raised to the second hole down,
instead of the top hole which would be as far down as possible.

SS Prop was in the box and this is what's on the box
The SS prop is a Mercury Vengeance Part #48-16318A46
(Diameter-13 3/4)
(Pitch-21)
(Blades-rotation 3RH)
(Material SS)


I honestly think the engine is too high and needs to be lowered to what looks like the original position of bottomed out.
The reason I think it's been raised is that looks like scuff marks from where bolts were previously on the engine mount, where it bolts through the transom.

The Al prop looks to be OEM with "832832A45 21P" stamped on it.

It's in the back storage compartment along with a ratchet/socket to switch it out.


Hitting the lake in about 30 minutes to see how the SS prop does.
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Old 07-14-2019, 07:50 AM   #24 (permalink)
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Damn, Can't believe I hadn't posted that

Mercury 150 Optimax

Runs about 42/43 mph at 5400 RPM and while trimming it up then it raises RPM's and starts sucking air at the prop. so I trim it back down until it quits sucking air at the prop.

I plan on hitting the lake tomorrow and see what the SS prop does for it.

When I bought the boat the PO said he used SS prop for pulling tubes and skiers. He bought the boat new...

If I give it almost full throttle from idle, it will damn near jump straight out of the water, like a leap frog.

I've owned the boat for just over 2 years and never tried the SS prop that came with it.
The boat get used just about 2 times per month and sometimes every weekend if the weather allows.
43 mph with a 21 pitch prop is 25% slip, which is pretty bad/ inefficient.

The WOT spec range of that is 5250-5750 so you're in it but have room to go up.

I would think the ss prop should improve the performance with its smaller diameter.

But if not, a step down to a 19 pitch prop may improve performance as well.

Edit:
The al prop appears to be a Mercury black max 14.25x21 pitch

The Mercury prop selector seems to point to a ~15" x 16 pitch prop.
https://www.mercurymarine.com/en/us/...or/#!/step-one
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Last edited by WTF?; 07-14-2019 at 08:06 AM.
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Old 07-14-2019, 08:27 AM   #25 (permalink)
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So I've never touched a prop but part of the reason I read all these threads is to learn about random shit I'll never need to know.

Is slip basically traction loss? So a 25% loss would be a prop/rpm spinning 100mph of thrust and only pushing a boat 75mph? If that's the case 25% loss pushing a giant boat with a tiny prop sounde pretty good.
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