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-   -   21' Scarab Prop Selection (https://www.offshoreonly.com/forums/prop-talk/378697-21-scarab-prop-selection.html)

CheckmateScarab 04-11-2023 03:25 PM


Originally Posted by Brad Christy (Post 4864400)
Checkmate,

It's a solid hob, but it is a cheap test for a 3B prop.

Thanks. Brad.
(937)545-8991

Good find - I find a lightly used 4B B1 28" prop, I am talking with the seller and should hopefully be able to pick it up. You mentioned solid hub, from my understanding, is that not required when you are talking about higher horsepower applications? Ive read that 400hp is the line between rubber and solid hubs. Would love to know more, as the props im looking at are all solid

Brad Christy 04-11-2023 03:50 PM


Originally Posted by CheckmateScarab (Post 4864415)
Good find - I find a lightly used 4B B1 28" prop, I am talking with the seller and should hopefully be able to pick it up. You mentioned solid hub, from my understanding, is that not required when you are talking about higher horsepower applications? Ive read that 400hp is the line between rubber and solid hubs. Would love to know more, as the props im looking at are all solid

Checkmate,

Personally, I prefer the props with a sacrificial hub. It's pretty much just a failsafe to prevent breaking or bending the shaft. Yes, at some point, HP/torque is going to dictate a solid hub. I don't think there's anything wrong with either, aside from overpowering the sacrificial hub.

I posted this Mirage Plus because I think your boat is going to be happier with it than the Bravo. This is merely an opinion based on empirical experience with our Rinker. As I understand it, the Bravos are considered "lifting" props, and I'd bet your hull doesn't need any transom lift, and, in fact, will ride wet like our Rinker did.

Thanks. Brad.
(937)545-8991

CheckmateScarab 04-12-2023 11:05 AM


Originally Posted by Brad Christy (Post 4864418)
Checkmate,

Personally, I prefer the props with a sacrificial hub. It's pretty much just a failsafe to prevent breaking or bending the shaft. Yes, at some point, HP/torque is going to dictate a solid hub. I don't think there's anything wrong with either, aside from overpowering the sacrificial hub.

I posted this Mirage Plus because I think your boat is going to be happier with it than the Bravo. This is merely an opinion based on empirical experience with our Rinker. As I understand it, the Bravos are considered "lifting" props, and I'd bet your hull doesn't need any transom lift, and, in fact, will ride wet like our Rinker did.

Thanks. Brad.
(937)545-8991

Thanks for the info, I figured only solid hubs would be suitable for my power - if I can get away with rubber hubs that helps open the search a bit. I sent that seller a message to see if they would be willing to ship, as it is local pickup only for now. For only $350 its hard to pass that up, and worth trying at a minimum! In addition, Im still going to pick up a 4B as well to compare the two, as it never hurts. Will keep you updated!

xlint89 04-12-2023 04:36 PM

Is it really a rubber hub, or the replaceable type?

I won't ever do rubber hubs again. Every one I bought used, spun. i then had it re-hubbed. Ended up spending more for the used POS old prop than buying new.

Brad Christy 04-12-2023 04:40 PM


Originally Posted by xlint89 (Post 4864509)
Is it really a rubber hub, or the replaceable type?

I won't ever do rubber hubs again. Every one I bought used, spun. i then had it re-hubbed. Ended up spending more for the used POS old prop than buying new.

Xlint,

All of mine have been some sort of hard plastic that pressed into the prop and a brass (?) insert that splined on the shaft and keyed into the plastic sacrificial hub.

While I've never needed any of it, I keep a spare prop, sacrificial hub, brass insert, a couple castle washers and prop nuts on the boat.

Thanks. Brad.
(937)545-8991

CheckmateScarab 04-18-2023 12:19 PM

The 3 blade seller never responded. Ended up buying a standard Bravo 1 28" - figured it's a safe enough point to get me on the water then I can start experimenting. I'll do more research on hubs, but leaning towards solid due to some of the stories I've heard with the non-solids

xlint89 04-18-2023 06:03 PM

Don't sweat the replaceable hubs like the Flo Torq from merc. Those can use a plastic for lower HP or they have a "solid" aluminum one for the higher HP engines. Either one can be installed/replaced into the prop.

https://www.ebay.com/itm/31207122832...3ABFBM_Lmr6fJh

I specifically will not use the "old style" rubber hubs any longer. Those are what i was having problems with.

They look like this. https://www.ebay.com/itm/36413309060...Bk9SR7y6zenyYQ

Team Archer 04-19-2023 12:44 PM

Be very careful with the 4 blade we built a 22 Scarab with a 525 and bravo shorty on ITS and could not run a 4 blade it would pick the back of the boat up and bow steer badly. we ended up with 27 pitch 3 blade mirage

Brad Christy 04-19-2023 12:46 PM


Originally Posted by Team Archer (Post 4865080)
Be very careful with the 4 blade we built a 22 Scarab with a 525 and bravo shorty on ITS and could not run a 4 blade it would pick the back of the boat up and bow steer badly. we ended up with 27 pitch 3 blade mirage

Checkmate,

This is still my thinking, only higher in pitch.

Thanks. Brad.
(937)545-8991

CheckmateScarab 04-19-2023 01:05 PM


Originally Posted by xlint89 (Post 4865012)
Don't sweat the replaceable hubs like the Flo Torq from merc. Those can use a plastic for lower HP or they have a "solid" aluminum one for the higher HP engines. Either one can be installed/replaced into the prop.

https://www.ebay.com/itm/31207122832...3ABFBM_Lmr6fJh

I specifically will not use the "old style" rubber hubs any longer. Those are what i was having problems with.

They look like this. https://www.ebay.com/itm/36413309060...Bk9SR7y6zenyYQ

thanks for the heads up! So you think that hub you linked would be sufficient? If so I will go ahead and send in an order!


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