[Car Biz]

VERY cool

 

[wwwTOPDJcom]

so if I have a bravo 26 that I had labbed and its perfect right now you could copy me a spare?

 

[Rock Steady]

Well I know where I am getting my next set of props! For sure....

 

[Throttle Up]

so if I have a bravo 26 that I had labbed and its perfect right now you could copy me a spare?

We are not offering that service yet. We will, in the future, offer a service to make an exact copy of a prop by using a laser 3D scanner and then machining it.

Currently we have a prop we designed from a blank screen which we feel is superior to other props on the market. The rake, pitch distribution, cup, pitch progression, etc is different from the Bravo 1 and any other prop on the market. We have tried to take what we have found to work from working on props and incorporate it into a prop of our own design.

By going the CNC route we are able to make a prop exactly the way we designed it with no compromises. It's very time consuming to manufacture a CNC prop but it really does produce a superior product.

Matt

 

[SuperMan]

Back To A Bent Prop...

So, the damaged prop blade(s) can than be positioned on a CNC produced pitch block & hammered back into shape, then re-CNC'd to perfection? (I know cast props are not heated before being hammered, in most cases.) Details on the repairs please. I'm having a hard time understanding how more material can be CNC'd(removed) from a damaged blade after first getting it "close" on a pitch-block. Thanks, S/M

 

[Throttle Up]

The prop would not be put back in the machine. The problem with that is when a prop is run the tips of the blades bend toward the bow of the boat. The amount the blade bend depends on how thick the blades are, how much horsepower the motors have and how much the boat weights.

Since the props are manufactured to within .001" it will bend more than that after a short period of time so it would be able to go back in the machine.

Repair would be the old fashioned way, with a pitch block, hammer, welder and sander. The advantage is that since the prop was near-perfect when it was made you would know that if it's worked to it's pitch block it would be as close to original as possible.

 

[Thunderman98]

Julie,

Any info yet on the info I sent to you yesterday

 

[born2burn]

Matt and Julie-

Sooooo the cat is out of the bag. :winker: I guess I was right when I guessed a CNC machine when I was there this last Feb with my dad when we went fishing. The secrete room was off limits though when the rep was there showing Matt the new set up.

Glad to here its up and running.

You guys still need a fence around the shop? :winker:

 

[superdave013]

Have you done any testing to compare them to the old skool props yet?

I know there are a few guys making billet 2 blade props on a cnc for the drag boats. Those are the hot item right now. They are very spendy though.

 

[Throttle Up]

OK, guys here you go!

4B CNC Throttle Up Propellers $1300.00
5B CNC Throttle Up Propellers $1900.00
6B CNC Throttle Up Propellers $2300.00

But you guys know I am always good for and Speedwake Special!

Keep and eye out !


Julie

 

[SuperMan]

Nice Prices!

Are these cast propellers heat treated? S/M

 

[Throttle Up]

There are a few guys out there making props on a CNC for specific applications. You can't compare making a 2 blade with a 6 blade. As you add blades the problems start rolling in. The machine to cut a 2 blade prop is completely different than a 5 or 6 blade.

I have seen some "CNC" props right out of the machine made by other guys and they barley resemble a prop. There is a lot of hand finishing that needs to be done.

Look at the picture I posted of our 6 blade prop. That is right out of the machine. It could be run just as it is!. We clean up certain areas of the prop by hand and it's done. It takes a lot more programming and time to finish a prop to the extent we do.

But, from the start we wanted to make the best props possible and we feel this is the way to do it.

We have done testing against other lab finished props. Typically we find you can run one of our props with 1 inch more pitch, which equates to speed, than you can with a typical lab finished prop.

 

[Tinkerer]

Julie-
HI
I am running a 34 SCARAB with twin 509's that put out 650 HP each.
I am currently running 80 Mph at 5400 RPM and 28 stock BRAVO 4 blades.
I was planning on having these props labbed and more cup added for bow lift and better cruise speed - OH I forgot I have 2 inch IMCO shorties.
The props slip on take off but do not blow out.
I rev it to about 5000 rpm and hold it and it comes on plane almost as fast as a normal boat. ( about 3 seconds )
I would like to be at about 5600 - 5700 RPM.
If I went with a 16 inch diameter prop would that get my cruise speed back and help with bow lift?
I really don't want to go to 5 blade props because of better chance of drive breakage.
Thanks Steve

 

[Throttle Up]

Julie-
HI
I am running a 34 SCARAB with twin 509's that put out 650 HP each.
I am currently running 80 Mph at 5400 RPM and 28 stock BRAVO 4 blades.
I was planning on having these props labbed and more cup added for bow lift and better cruise speed - OH I forgot I have 2 inch IMCO shorties.
The props slip on take off but do not blow out.
I rev it to about 5000 rpm and hold it and it comes on plane almost as fast as a normal boat. ( about 3 seconds )
I would like to be at about 5600 - 5700 RPM.
If I went with a 16 inch diameter prop would that get my cruise speed back and help with bow lift?
I really don't want to go to 5 blade props because of better chance of drive breakage.
Thanks Steve

The larger diameter would increase your stern lift and possibly reduce your cruise speed. Maybe a diameter of 15.25 or 15 3/8 would work better for you. The 28 Bravos' are usually about 15" in diameter out of the box.

How does the bow carry now? Do you have to put a lot of drive trim in to get the bow up? Is there a rooster tail when you are at top speed and trimmed for top end speed?

Lab finishing your stock props may make them very difficult to get on plane, they would tend to "blow out" more than they do now. Have you experimented with spacers and the 2" shorties?

What year is your Scarab? Does it have steps?

Matt

 

[Throttle Up]

Julie-
HI
I am running a 34 SCARAB with twin 509's that put out 650 HP each.
I am currently running 80 Mph at 5400 RPM and 28 stock BRAVO 4 blades.
I was planning on having these props labbed and more cup added for bow lift and better cruise speed - OH I forgot I have 2 inch IMCO shorties.
The props slip on take off but do not blow out.
I rev it to about 5000 rpm and hold it and it comes on plane almost as fast as a normal boat. ( about 3 seconds )
I would like to be at about 5600 - 5700 RPM.
If I went with a 16 inch diameter prop would that get my cruise speed back and help with bow lift?
I really don't want to go to 5 blade props because of better chance of drive breakage.
Thanks Steve

The larger diameter would increase your stern lift and possibly reduce your cruise speed. Maybe a diameter of 15.25 or 15 3/8 would work better for you. The 28 Bravos' are usually about 15" in diameter out of the box.

How does the bow carry now? Do you have to put a lot of drive trim in to get the bow up? Is there a rooster tail when you are at top speed and trimmed for top end speed?

Lab finishing your stock props may make them very difficult to get on plane, they would tend to "blow out" more than they do now. Have you experimented with spacers and the 2" shorties?

What year is your Scarab? Does it have steps?

Matt

 

[Throttle Up]

Julie-
HI
I am running a 34 SCARAB with twin 509's that put out 650 HP each.
I am currently running 80 Mph at 5400 RPM and 28 stock BRAVO 4 blades.
I was planning on having these props labbed and more cup added for bow lift and better cruise speed - OH I forgot I have 2 inch IMCO shorties.
The props slip on take off but do not blow out.
I rev it to about 5000 rpm and hold it and it comes on plane almost as fast as a normal boat. ( about 3 seconds )
I would like to be at about 5600 - 5700 RPM.
If I went with a 16 inch diameter prop would that get my cruise speed back and help with bow lift?
I really don't want to go to 5 blade props because of better chance of drive breakage.
Thanks Steve

The larger diameter would increase your stern lift and possibly reduce your cruise speed. Maybe a diameter of 15.25 or 15 3/8 would work better for you. The 28 Bravos' are usually about 15" in diameter out of the box.

How does the bow carry now? Do you have to put a lot of drive trim in to get the bow up? Is there a rooster tail when you are at top speed and trimmed for top end speed?

Lab finishing your stock props may make them very difficult to get on plane, they would tend to "blow out" more than they do now. Have you experimented with spacers and the 2" shorties?

What year is your Scarab? Does it have steps?

Matt

 

[Rock Steady]

OK, guys here you go!

4B CNC Throttle Up Propellers $1300.00
5B CNC Throttle Up Propellers $1900.00
6B CNC Throttle Up Propellers $2300.00

But you guys know I am always good for and Speedwake Special!

Keep and eye out !


Julie

oh.... well maybe I won't be gettin a set of these...

 

[Throttle Up]

Julie-
HI
I am running a 34 SCARAB with twin 509's that put out 650 HP each.
I am currently running 80 Mph at 5400 RPM and 28 stock BRAVO 4 blades.
I was planning on having these props labbed and more cup added for bow lift and better cruise speed - OH I forgot I have 2 inch IMCO shorties.
The props slip on take off but do not blow out.
I rev it to about 5000 rpm and hold it and it comes on plane almost as fast as a normal boat. ( about 3 seconds )
I would like to be at about 5600 - 5700 RPM.
If I went with a 16 inch diameter prop would that get my cruise speed back and help with bow lift?
I really don't want to go to 5 blade props because of better chance of drive breakage.
Thanks Steve

The larger diameter would increase your stern lift and possibly reduce your cruise speed. Maybe a diameter of 15.25 or 15 3/8 would work better for you. The 28 Bravos' are usually about 15" in diameter out of the box.

How does the bow carry now? Do you have to put a lot of drive trim in to get the bow up? Is there a rooster tail when you are at top speed and trimmed for top end speed?

Lab finishing your stock props may make them very difficult to get on plane, they would tend to "blow out" more than they do now. Have you experimented with spacers and the 2" shorties?

What year is your Scarab? Does it have steps?

Matt

 

[Tinkerer]

Mat
My boat is a 1992 and does not have steps
I like the drives the height that they are right now.
With stock drives and 4 blade props the boat would take off like a jet boat out of the hole.
It also handled bad at max speed trim setting ( 8 - 9 )
The boat rides much flatter now and is VERY predictable in the rough. Handling improved drastically with the shorter drives.
Neutral drive trim is at 3 on the cable indicaters and trim for max speed is at 7-8.
I don't throw much of a tail.
The boat does carry the bow but it just seems like it could use some more bow lift.
In a couple of years if I still have this boat I plan on installing stand off boxes.
Thanks

 

[Throttle Up]

What were the performance numbers before and after the shorter lowers? RPM@WOT, props and pitch, and speed.

The stand off boxes will effective lower the drive height if they are mounted so the drives are in the same position they are in now. That would help give you a little more bow lift.

When the boat is properly trimmed for max speed there should just be a mist behind the boat. If there is a distinct rooster tail it's possible the drives are too high and that's would account for not having enough bow lift.

Matt