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Author Topic:   Dauntlass High Bow hole shot

nnkboykin posted 06-22-2009 03:13 PM ET (US)
I have a 2001 16 Dauntlass with a Merc. 90 4 stroke on the back... It has a terrible time getting on plane even with just me on board. So much so that unless the moter is trimmed all the way (Bow down) it will fill the back section of the boat (where the Bilge access is) with water because the stern is so low in the water. Even with the engine trimmed all the way (bow down) I am not so sure that the motor exaust is not under water at take off. thats how far down the stern goes... any remidies for this?
Thanks,
Allen
Feejer posted 06-22-2009 03:47 PM ET (US)
1st Do a search on the subject
2nd contact Rich S I think he has the same combo
3rd your engine might be mounted too low
Filling the back with water? Wow
Maybe switch to a 4 bladed prop will help or adding a hydrofoil
Rich S posted 06-22-2009 04:46 PM ET (US)
Allen:
There is a ton of info here about the 16/160 Dauntless and what people have done to their boats to improve hole shot and the time it takes to come on plane. If you do a search just for the 16 or 160 Dauntless, you'll get lots of advice to read.
I personally have a 2002, no transom notch, and the Merc 90 HP 2 stroke Saltwater with the stock Merc Quicksilver Aluminum 3 blade prop. Both my batteries are located in the center console - and not under the starboard stern seat.
What I did was:
My engine was mounted all the way down on the transom. I moved it up one hole. I also added a hydrofoil.
These two things together changed my boat's ability to come on plane dramatically. I actually could believe the difference.
Now, she still isn't quick to plane with a full tank of gas and 4 large men and loaded with gear. But it isn't bow high for very long.
When I throttle up to get the boat on plane, I generally start with the engine trimmed down fairly far. It's only a few seconds before she jumps and comes on plane. Then I throttle back and trim the engine out to it's optimum position.
Hope all this helps you.

Jefecinco posted 06-22-2009 07:33 PM ET (US)
Allen.
I have a 1999 Dauntless 16. Mine is powered by a 115 HP two stroke engine. IMO your Dauntless is underpowered and will never perform to it's potential with a 90 HP engine.
Realizing that a repower to a 115 HP engine is the last thing you want to do there are probably a couple of things you can do to improve your boat's performance with a 90.
First, you can probably experiment with the engine mounting height. Move it up a hole at a time and see what you think. If you're not happy with the result you can move it back down. Second, I would try mounting a hydrofoil device on the engine's anti-cavitation plate. That, along with a "best" mounting height of the engine may get you where you want to be.
Finally the most expensive and probably the most effective solution is to change your propeller to a better performing one for your application. A good four blade Stiletto could do wonders for your issue. Check with Tom Clark who is a noted propeller guru and also just happens to sell Stiletto Propellers.
Good luck.
Butch
Marlin posted 06-23-2009 12:19 AM ET (US)
I agree with the others -- the first thing you should do is add a hydrofoil. I put on a Sport SE 200, but if I were to do it again, I'd go with the larger 300. Next, a propeller. I got a great improvement going from my old 16" Vengeance to a 17" Trophy Plus 4-blade. I think a 4-blade is the way to go with this boat, but depending on your lower unit gearing, 17" might be too much. Third, adjust engine height. I saw a significant improvement in porpoising by moving from the lowest mounting position to one hole up. A second hole up was okay with the Trophy Plus, but no good for my lower-pitched ski prop. Finally, check how your boat is loaded. It's tempting to store a bunch of stuff below the aft quarter seats, but you should reserve the whole stern storage area for light stuff like fenders. Stow the heavier stuff in the console.
I think you'll be nothing short of amazed at how the boat performs after you put on a foil. And not just for bow rise getting on plane; the boat is much more stable in chop, you can keep the bow down at low planing speeds, and it really seems to cut down on the pounding.
-Bob
dburton posted 06-23-2009 01:28 AM ET (US)
You have a GREAT boat. Keep working with it. You will solve all your problems.
pglein posted 06-23-2009 11:24 AM ET (US)
While your situation is obviously severe, it is worth noting that on ALL boats (with relatively vertical transoms) it is usually necessary to trim the motor all the way down in order to get up on a plane quickly and efficiently. You would then trim it back up to adjust the ride as needed.
My 18' Outrage had a hydrofoil mounted on the engine when I bought it. I found that the boat actually performed better without it.

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Author	Topic: Dauntlass High Bow hole shot
nnkboykin	posted 06-22-2009 03:13 PM ET (US) I have a 2001 16 Dauntlass with a Merc. 90 4 stroke on the back... It has a terrible time getting on plane even with just me on board. So much so that unless the moter is trimmed all the way (Bow down) it will fill the back section of the boat (where the Bilge access is) with water because the stern is so low in the water. Even with the engine trimmed all the way (bow down) I am not so sure that the motor exaust is not under water at take off. thats how far down the stern goes... any remidies for this? Thanks, Allen
Feejer	posted 06-22-2009 03:47 PM ET (US) 1st Do a search on the subject 2nd contact Rich S I think he has the same combo 3rd your engine might be mounted too low Filling the back with water? Wow Maybe switch to a 4 bladed prop will help or adding a hydrofoil
Rich S	posted 06-22-2009 04:46 PM ET (US) Allen: There is a ton of info here about the 16/160 Dauntless and what people have done to their boats to improve hole shot and the time it takes to come on plane. If you do a search just for the 16 or 160 Dauntless, you'll get lots of advice to read. I personally have a 2002, no transom notch, and the Merc 90 HP 2 stroke Saltwater with the stock Merc Quicksilver Aluminum 3 blade prop. Both my batteries are located in the center console - and not under the starboard stern seat. What I did was: My engine was mounted all the way down on the transom. I moved it up one hole. I also added a hydrofoil. These two things together changed my boat's ability to come on plane dramatically. I actually could believe the difference. Now, she still isn't quick to plane with a full tank of gas and 4 large men and loaded with gear. But it isn't bow high for very long. When I throttle up to get the boat on plane, I generally start with the engine trimmed down fairly far. It's only a few seconds before she jumps and comes on plane. Then I throttle back and trim the engine out to it's optimum position. Hope all this helps you.
Jefecinco	posted 06-22-2009 07:33 PM ET (US) Allen. I have a 1999 Dauntless 16. Mine is powered by a 115 HP two stroke engine. IMO your Dauntless is underpowered and will never perform to it's potential with a 90 HP engine. Realizing that a repower to a 115 HP engine is the last thing you want to do there are probably a couple of things you can do to improve your boat's performance with a 90. First, you can probably experiment with the engine mounting height. Move it up a hole at a time and see what you think. If you're not happy with the result you can move it back down. Second, I would try mounting a hydrofoil device on the engine's anti-cavitation plate. That, along with a "best" mounting height of the engine may get you where you want to be. Finally the most expensive and probably the most effective solution is to change your propeller to a better performing one for your application. A good four blade Stiletto could do wonders for your issue. Check with Tom Clark who is a noted propeller guru and also just happens to sell Stiletto Propellers. Good luck. Butch
Marlin	posted 06-23-2009 12:19 AM ET (US) I agree with the others -- the first thing you should do is add a hydrofoil. I put on a Sport SE 200, but if I were to do it again, I'd go with the larger 300. Next, a propeller. I got a great improvement going from my old 16" Vengeance to a 17" Trophy Plus 4-blade. I think a 4-blade is the way to go with this boat, but depending on your lower unit gearing, 17" might be too much. Third, adjust engine height. I saw a significant improvement in porpoising by moving from the lowest mounting position to one hole up. A second hole up was okay with the Trophy Plus, but no good for my lower-pitched ski prop. Finally, check how your boat is loaded. It's tempting to store a bunch of stuff below the aft quarter seats, but you should reserve the whole stern storage area for light stuff like fenders. Stow the heavier stuff in the console. I think you'll be nothing short of amazed at how the boat performs after you put on a foil. And not just for bow rise getting on plane; the boat is much more stable in chop, you can keep the bow down at low planing speeds, and it really seems to cut down on the pounding. -Bob
dburton	posted 06-23-2009 01:28 AM ET (US) You have a GREAT boat. Keep working with it. You will solve all your problems.
pglein	posted 06-23-2009 11:24 AM ET (US) While your situation is obviously severe, it is worth noting that on ALL boats (with relatively vertical transoms) it is usually necessary to trim the motor all the way down in order to get up on a plane quickly and efficiently. You would then trim it back up to adjust the ride as needed. My 18' Outrage had a hydrofoil mounted on the engine when I bought it. I found that the boat actually performed better without it.