Turning Point Rascal review

[anzomcik]

I got my new Turnign Point Rascal prop in today, and ran to the lake to get some numbers and compair to my old Solas Amita 3. I wanted more rpm so i went down 2" of pitch on the Rascal. Solas 13pitch Turning Point 11pitch

1994 Monark 1400sc. 14'6" 65 inch beam semi Vee.
25hp Mariner 2cyl 2 stroke.
Loaded 250lbs (gas, batterys, fishing gear, kicker, electric motor...)

Speed was from GPS, and rpm from Tiny Tach

Here is what i got.

RPM - Solas mph - Rascal mph
1000 - 2.5 - 2.0
1500 - 4 - 2.9
2000 - 5.2 - 4
2500 - 6 - 4.8
3000 - 7 - 5.8
3500 - 10 - 7
4000 - 13 - 10
4500 - 17 - 13
5000 - 21 - 17
5350 WOT Solas 24.3 26% slip
5840 WOT Rascal 22.8 25% slip


The two props acted so different. When i opened the Rascal from its box i first noticed that it did not have the same super nice finish as the Solas. Not that that makes a difference, but on looks i give the nod to Solas

As i motored aways from the launch i could not tell much difference at super low speed. Then once motor was warm, i steady gave it throttle and noticed i felt a little disconnected right away from the turning point. I knew the prop was spinning, i was watching the tach and it was climing higher but i felt like i had no controll in the middle speed from no wake- climbing on plane.

Once on plane 12mph +- i looked down and seem my tach around 5500 then like all at once the prop caught and it started to connect with more speed. This happened every time i took off. Like it was venting the whole time, i did not like that at all.

Once on my way, i felt liek the boat rode higher in the water, it felt good. I turned super hard either way and the prop held like it was on rails. I was super impressed how well it held. I could never take the turns i did with my Solas with out venting on the exits. It rode much nicer at the upper 25% of throttle range.

Ok i know i changed brand of props and pitch. If i had to choose which prop i would stick with my Solas, i got more speed and better handleing at the bottom 75% of throttle, and the Solas isnt all that bad at top end handling just not as good at the turning point.


Ok my questions now, Why do you think the Rascal was venting when trying to plane the boat? The Solas digs in with no problem and goes, in the same RPM range

Should i try a 13 pitch rascal, or four blade prop... Whats your thoughts Thanks

 

[steelespike]

Re: Turning Point Rascal review

The turning points are agressive and unpredictable.
Don't know what is happening on venting on hole shot.
But something is amiss on your slip numbers,probably a wrong variable.rpm comes to mind.Is the bottom clean nothing to disturb the flow toward the prop.Turbulance could increase slip.Did you play with the trim?
25% is off the scale. The turning point will allow the motor to be mounted higher. You could gain a couple of mph.If no vertical adjustment physically raise it on 1/4" sticks to a point just before venting becomes a problem.Just be sure the clamps have a good grip.

 

[anzomcik]

Re: Turning Point Rascal review

The bottom of my boat is clean, no repairs, never kept in the water. Only thing is rivits, because it is a rivitied aluminum boat.

I had the antivent plate last season level with the bottom. I made my own spacer, and i would have terrible venting with the Solas in corners. Over the winter i had made a new spacer and lowered the motro to have the antivent plate 1.5 inch below the bottom of the boat. It is a real pain to change the motor heigth as i bolted it on, and it does not have different holes to mount higher or lower. With the motor 1.5 inch lower the solas holds much better at top speed but not as good as turning point.

I did not play with trim, i do not have power trim so i would have to to put it on trialer to get to the adjustment.

 

[hwsiii]

Re: Turning Point Rascal review

Anzo, Spike is right as always.

I show your maximum RPM should be 6,000 RPM and that you have a 2.25:1 gear ratio, please verify this. If this is correct I show you have 17% prop slip with the Solas and 16% prop slip with the Rascal.

Prop Slip

Only thing is rivits, because it is a rivitied aluminum boat.

I had the antivent plate last season level with the bottom. I made my own spacer, and i would have terrible venting with the Solas in corners. Over the winter i had made a new spacer and lowered the motro to have the antivent plate 1.5 inch below the bottom of the boat.

In the past I have noticed in my prop analysis that some riveted hulls tend to have much more prop slip than is normal, and I attribute that to the rivets in some hulls disrupting the slip stream and causing excess ventilation at the prop. I have also seen that by lowering the props, in some instances, it gets the prop partially below this disrupted water flow and there is a decrease in ventilation and thus theoretical prop slip.

You will never get the maximum speed that your boat is capable of without having power trim, so we will do the best we can with the way it is.

Buy the Solas Amita 4 blade aluminum prop in an 11" pitch and you will find your RPM and speed will increase over the Solas you have now beause you will be able to raise the motor higher on the transom. BUT do NOT expect more than a couple of MPH



H

 

[anzomcik]

Re: Turning Point Rascal review

I see where my mistake was, i messed up my gear ratio. I mixed up the ratio of my 9.9 which is 2:1, and my 25hp is 2.25. Now everything makes sence Good catch hwsiii. I will post my results when i get my 4 blade. Thanks

 

[hwsiii]

Re: Turning Point Rascal review

You are very welcome Anzo, and I will be here.



H

 

[anzomcik]

Re: Turning Point Rascal review

After messing around with the 4blade solas 11 pitch my impressions are so far i like it. My speed is about the same as the solas 13 pitch, it handles better than the 13 pitch solas at high speeds. I would say the rascal handled better at WOT but this was better all around.

One downfall, i still get the venting in the mid range, not nearly as bad at the turning point but it is still there. It wierd the 13pitch solas vent at high speed in the slightest corner, the turning point vents like a pig in the mid range, and the 4 blade solas vents in mid but almost tolarable. I might be able to work around it.

I do not have the number lay out but my WOT is 5800 at 23.8 mph. Thats about a hair over 12% slip, a very nice number.