NEW ABC PROPS

[nitro junky]

Anyone tried the new ABC props on a MAC 45?

 

[Don Ferrette]

Anyone tried the new ABC props on a MAC 45?

In a what? What application, rigger, mono, sport 40???????? :blink:

 

[shoboat]

Boaters,

Most of the new ABC propellers were designed for hydros,but some do work

on other boats as well. We have found that the 2114 and 2116 work the best

for MAC 45's. On the 1714,1716,and 1717 we have found that they either work

well, or they require a different setup on the 21's. For a 21 mono we like the

40 x 52/3 and the twins are liking the 2516's or the 2616's so far from our

testing.

Thanks,

Mark Sholund

 

[nitro junky]

On a rigger, Crapshooter

 

[Don Ferrette]

On a rigger, Crapshooter

2116. B)

 

[BlackJack21]

NJ,

I have been testing with the 2116 and the 2118, both two and three blade versions. The 2116 is so far the better of the two, as it rev's higher, but I have not made any changes (cutting down, Barr-cut, etc...) so the jury is still out on the 2118. The 2216 is also a good choice. I have since gone back to my Octura 1657 until I can make some changes to the ABC props, because it is faster and more predictable.

This info is from a MAC powered (nowhere near stock) Crapshooter45.

Don't bother with the three blade props. It's hard to explain, but on my boats they were unacceptable.

Thanks. Brad.

Titan Racing Components

 

[nitro junky]

Brad, are you reducing the diameter of the 1657. I am currently using a 1655 with 4.5 cup. Modified MAC 45 and it screams.

 

[shoboat]

Billy,

You need more cup in that blade,around 4.7" and watch it really go.

The 2114 and the 2116 would be my choice on the forty boat,they work

quite well around 75 to 80 MPH depending on your setup.

Brad,

I don't quite understand why you think the 1.8 pitch ratio will work well for

heat racing when you are constantly going back to a 1.6 pitch ratio? We have

found the 1.4 and 1.6 pitch ratios to be the best for heat racing. I think the 1.8

pitch ratios are better suited towards the gas boats and Str.Away boats. If you

would play with the cupping on a 1716 or 1714 you would get your boat into the

60's consistantly. We have Bryan Jacuzzi's BlackJack 21 running real well on a

1716 right now. If you have a Nova Rossi 21 the 1717 is working real well also.

Have Fun Testing Fellas,

Mark Sholund

 

[TimD]

Do the new types of ABC props respond well to any particular mod more so than other mods?

 

[shoboat]

Tim,

I think they need to be recupped for better performance. Backcutting has

helped some,but I would grind out some of the cup on the trailing edge and

recup them for your motor and pipe setup. It has worked well for some of

my customers.

Thanks,

Mark Sholund

 

[nitro junky]

Mark, You did the 1655 a while back. It was cooler weather then. We had it on radar 79-81 mph. I might try more cup to see what it will do. Its plenty fast now though.

 

[shoboat]

Billy,

Glad to hear one of my propellers is still working well for you. I think

a lot of 45 riggers would be VERY HAPPY at those kind of speeds, 70's and low

80's are VERY FAST for a 45 rigger. I was at a race last weekend and there were

no 45's that fast up here in District #2 in heat racing setup.

Thanks,

Mark Sholund

 

[Ian Inverarity]

Mark,

In talking to Jim Schaeffer at the Internats he was suggesting an approach of using the 1.4 or 1.6 pitch ratio props but using quite large diameters and grinding the cup out of the trailing edge to unload them until the engine can run with them, for example 3014's and 3016's on twin 90 riggers. Thus using the higher tip speed and large blade area to run with relatively low pitch progression. Have you tried this approach at all?

Ian.

 

[shoboat]

Ian,

I think that would be a good way to go,except I think Paul Stirton is pretty

happy with a pair of 2516's on his Twin 84 SGX. I have a few others that are

liking the 2616's on there twins also. It really comes down to setup and

handling I think for heat racing. I like smaller propellers with more cup vs

big propellers with less cup. It is true though that a bigger blade does throw

more water,but I think our boats are happier with smaller blades and turn more

revs.

Whatever Works For You, B)

Mark Sholund

 

[BlackJack21]

Mark, NJ, others,

We do keep returning to the 1.6 pitch ratio props because they are performing the way we like. The problem with the ABC props is the overly radical cup right at the trailing edge. This is only my opinion based on what I have seen and what I've been told that I agree with. I was told a few years ago by a VERY respected, HIGHLY successful boater that a high pitch progression (increase of pitch from leading edge to trailing edge) is not the best set-up for riggers, because they induce so little load on the prop. This is why the Octura 16xx props work so well on riggers. The have almost no pitch progression.

What I have seen with the ABC props, is alot more load on the engine with little or no increase in speed. They launch better because the pitch progression helps with the increased wetted surface during launch, but when the boat unloads and takes off, the trailing edge cup continues to load the engine throughout the RPM range. If you look at the working face of the blade, where it attaches to the hub, right at the trailing edge, the blade is cupped past parallel with the shaft, causing the blade to have to push through the water like a paddlewheel. This is particularly noticable on the 1.8 pitch ratio props. Eliminate this and you're alot better off.

With the Octura 16xx props, there is very little pitch progression, making them a tougher launch, but once the boat planes out, the engine unloads much better and the throttle response is alot smoother.

With all this said, I think the 1.8 pitch ratio ABC props will be very good with the right modifications. A significant Barr-cut and a fair amount of back-cutting will allow the prop to unload alot more, producing better RPM's, but leaving the reduced rake at the blade tips, which will produce better "shaft torque". We have seen this with the 1718 on our BlackJacks, although we are not ready to start racing with it yet (I have gone back to my 1650 until I can get the 1718 right). I have ran the 2118 on my 45 with limited success. It is just about as fast as the 2116, but is several thousand short on the RPM. If I can get the prop to unload and produce the same RPM as the 2116, the 2118 will be a much faster prop, with less load on the engine.

Don't get me wrong, I'm not knocking the new ABC props. They are very good, especially considering they have only really been on the market for one season. With some refinements, Jim Shaeffer is going to put the screws to Octura. If they don't pay attention, Octura is going to lose alot of business to Jim.

Thanks. Brad.

Titan Racing Components

 

[BlackJack21]

Billy,

I cut down the diameter on the 1657 to 55mm when I first switched for the 55 to the 57, but I now run it at full diameter. I do however "Barr-cut" it to reduce the load on the engine.

Do not cup the 16xx props. If you can pull a cupped 1655, you should switch to the 1657. You can pitch them up a bit at a time (a couple thousandths/rev), but a cup will drag the engine down. With riggers, the less pitch progression, the better. I started cupping the 1655's and started taking out plugs. Yes, I was going faster, but it was not worth the expense of the plugs or the damage to the engine. Stu Barr told me to try the 1657 instead of cupping the 1655. I did and the boat went faster and the engine quite cooking the plugs. Less load, more speed.

Again, just what I have experienced.

Thanks. Brad.

Titan Racing Components

 

[carlnoki]

What woul dbe a good replacement for a cupped up 1667? presently used on my CMB (EVO/Black case) powered rigger, MAC pipe, 60% fuel.

the boat runs in the low 70's at present.

also would like a recommendation for a 21 prop for my Hawk. CMB green head, OPS pipe set at 3" along side the engine, 60% fuel.

thanks

carl

 

[BlackJack21]

Carl,

Try the H667 from Octura. Same size and pitch (theoretically) as the 1667, but it is a MUCH more aggressive prop.

As for the 21 Hawk, you can't go wrong with the ABC 1716. The 1714 and 1814 are also good starting points. Also try the Octura 1445 (pitched up), 1450 and the 1650 cut down to no more that 45mm (my personal favorite at the moment).

After "scrapping" a 1716 while thinning the blades out, I decided to rebalance it and ended up with a 1716 with a diameter of roughly 1.5" (38mm). I'll be darned if it doesn't work like a charm. With my standard set-up it is just as fast as the stock 1716, but launches much easier and goes from a milling idle to full throttle almost as fast as it does on the stand. I'm thinking about seeing how short I can run the pipe, looking for more RPM. Just goes to show you that a prop is not junk until it doesn't work for you.

Hope this helps. Brad.

Titan Racing Components

 

[shoboat]

Carl,

An ABC 2616 should do it for the first boat and a 50 x 69 cut to 46mm for

the twenty boat. Have you ever tried a H-7 on the Hawk? It is another

GREAT PROPELLER from ABC.

Have Fun,

Mark Sholund

 

[gil sonsino]

Hi Mark

Last saturday went to water for a first trial with my new GR 21 saw rigger and just to share with you some data.

I tried different 1450 props

1450 50mm cup 3.3 launches well,good lift but need more cupping

1450 diam 46mm cup 3.4 launches well and speed is reasonable

1450 diam 46mm cup 3.5 launches well and boat is faster

1450 diam 45mm cup 3.7 lauches well and speed is great

H7 repiched(dont remember numbers ) not good

1950 diam 45mm cup 3.7 speed increased

2047 diam 45mm really fast here !

Next weekend we will do more tests and bring the Stalker to see the speed!.

Thanks and regards

Gill