rooster tail

[procraft]

should all boats make a rooster tail at ful speed and what will cause one to turn hard right as soon as you let go of the wheel emoThanks in advance</p>

 

[TnSabre]

if a boat is set up properly it should not have a rooster tail any higher then the top of the motor when running wide open.

 

[Liveliner]

Sounds as if you may be running trimmed in too far at full throttle and may be missing the trim tab behind your prop or it is adjusted very wrong. You did not say if YOU were making a rooster-tail or wondering why you are not making one. I assume you are not by the hard right turn you described. Also how is the weight distributed in your boat. If you have all your batteries on the right side and you are sitting on the right side, that will make your boat pull right. Tell me more details as I mentioned.

 

[procraft]

it will not make a tail no mater what the weight is distributed ok but i am a very big guy but my sons boat dont do that when i drive it if you let go of it atany speed even very slow the moter will turn to the right super fast if you was going fast and let go some one is hurt it will do that super fast

 

[wrechin2]

Not all boats will throw a rooster tail. When you see a tail,it is because the engine is very high on the jack plateor the engine trim angle is very high or a combination of the two.Having a tail is not always effcient.If your engine is bolted to the transom and not a jack plate, it will be very difficult to throw a rooster tail as the prop will be very deep in the water. I will link you to 2 videos of Wes' boat (my helper) thatwhen you watch will let you better understand what is rooster tail is from. You can see the engine is very high on the jack plate and runs good at this height due to a surface piercing prop (chopper) and a low water pick up.If you notice the propshaft is running almost level with the surface. The "pull" you feel is called torque steer. When you look and understand what the prop is is doing and how it "bites" you will understand how trimming up too high will cause excessive torque steer. There are "add ons" that can lessen torque steer and different props will have different amounts of torque steer. A torque "tamer" will counter the effects of torque steer. It attaches to the skeg because the trim tab on the cavitation plate will be out of the water and basicly useless. </p>

Here are 2 videos of my helpersbullet that we run the engine very high on. These will help you understand a little better what a tail is and why they are formed. </p>

Please note at 2:10 you can actually see the prop is 1/2 way out of the water! These are designed to run this high and still maintain "bite" You can see basicly the water is being slung off the blades coming out of the water causing the tail. Please also note the faster the boat runs, the less of a tail. This is due to the angle changing as the boat speeds up and the bow lifts from speed and not only from the engine angle. </p>

<font color="#00008b">http://www.youtube.com/watch?v=QJ0ZRt_isN4&playnext=1&videos=HvYRKtMZPJA&feature=mfu_in_order</font></p>

Here is the video from the top. If you notice it throws a long rooster tail and the engine is hardly trimmed up. This is from the engine being very high on the transom. This is a chopper along with a low water pick up. DON"T try this on yours. The prop is pushing the water straight out causing a rooster tail.</p>

<font color="#00008b">http://www.youtube.com/watch?v=2feiij8fCMU&feature=related</font></p>

 

[Liveliner]

This info I wrote a while back. It isdefinitelynot Hi- tech. Hopefully it is helpful to you in understanding what your boat is doing.</p>

http://www.chattanoogafishingforum.com/forums/thread-view.asp?tid=3742&posts=17</p>

 

[Liveliner]

Wrenchin2, Those videos you posted are awesome. Thanks

 

[wrechin2]

Thanks! They are neat and educational. Give you a good sense of what is going on that you can't see.</p>

On the props......You are 100% correct! The best thing to do is run a prop. There is so much to a prop choice and there is no "magic" prop that will cover all areas. Sometimes the best source is the boat manufacture. You would be surprised at what information they can give you on a particular boat set up. Wes is running my uncut 26 chopper in the videos and it comes out at 6500 and has a very short hole shot as you see. We have tried my 26 chopper with a Allision cut (recently got) and it lowered the hole shot RPMs to 5100 and now takes a little longer (few feet) and at 4500 RPMs will GPS 60-61 MPH cruising and will make the GPS jump by 8's when taking off. Still in the set up stages and having the trim leak down doesn't help and in the process of converting to a single ram system like the HP offshore uses. When we finally get it set up correctly, it should run in the high 80's to low 90's with no problem. Both are the same props just one has been modified and reacts totally different than the other. Just my experiences. </p>

 

[brushhog]

how'bout that,pretty cool,looks like the tranasducer could use some relocation,

 

[Auburnwes]

Thats one of them fancy transducers that see through air!.

 

[Liveliner]

Transducer ... What are you going to see on the bottom at 80 MPH? -

 

[wrechin2]

Liveliner - 10/7/2010 8:45 PM Transducer ... What are you going to see on the bottom at 80 MPH? -

</p>

Plus at 80, you only need about 10" of water to run as well. emoBigsmile </p>

 

[TheFisherman]

You may only need 10 inches of water but I wouldn't dare run those speeds in any water shallow enough for a stump to surprise you (sure that didn't really need to be said but some unknowledgeable person reading this might decide to rip across some bar to shortcut into a creek one day ...). I agree with you on all you've said on props. You just have to try several and you might hit on a great one. I had a favorite Hoss cut chopper that ran my boat over 85. My boat ran a little faster with some other props but that one didn't cost as much so I ran it most of the time until I broke a prop shaft and lost it to Richland Creek.

 

[wrechin2]

TheFisherman - 10/17/2010 4:12 PM You may only need 10 inches of water but I wouldn't dare run those speeds in any water shallow enough for a stump to surprise you (sure that didn't really need to be said but some unknowledgeable person reading this might decide to rip across some bar to shortcut into a creek one day ...). I agree with you on all you've said on props. You just have to try several and you might hit on a great one. I had a favorite Hoss cut chopper that ran my boat over 85. My boat ran a little faster with some other props but that one didn't cost as much so I ran it most of the time until I broke a prop shaft and lost it to Richland Creek.

I was simply stating a fact. I would hope that most people would realize we are talking about a high performance boat where the propshaft is running withe surface of the water as seen in the video. If they have a boat that will run 80MPH they are not a unknowledgable boat owner. So I will clear it up.......

WHEN RUNNING 80 MPH IN A BULLET AND THE ENGINE IS AS HIGH AS THE ONE YOU SEE IN THE VIDEO, PLEASE UNDERSTAND IT ONLY REQUIRES ABOUT 10" OF WATER. I DO NOT ADVISE YOU RUN IN SHALLOW WATER WITH STUMPS OR ROCKS WITH ANY BOAT.