bow bouncing upon throttel up

P

Pat

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Joined
May 31, 2011
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C Dory Year
2007
C Dory Model
19 Angler
Hull Identification Number
cd019115g607
Vessel Name
Snow Day
We are new to the C-Dory, When we throttle up the bow rises and the boat starts to porpoise up and down and gets harder and more violent unless I throttle it back down. Am I doing something wrong?
 
A few questions first:
1) Which C-Dory model do you own?
2) How is it equipped (engine size(s), does it have permatrims installed, does it have trim tabs installed)?
3) What are the conditions in the water in which you are boating (flat calm, swells, waves, wave/swell height)?

With answers to those questions we can tell you if you are doing something wrong or not.
 
Pat, is your engine trimmed WAY up? It sounds like you might be starting out with too much up trim.
 
Just trim the motor all the way down and you should be fine. After you get up on plane start to trim the motor back up, if you start to propose trim it back down.
If you have trim tabs start out full down trim than trim up.

Stay tuned, we'll get you straightened out.
 
Wandering Sagebrush":16p73jbd said:
Pat, is your engine trimmed WAY up? It sounds like you might be starting out with too much up trim.
Click to expand...

Ditto...engine trimmed up too high. Trim it level or down and adjust from that point for desired ride.
 
Also, check to where the engine is adjusted to the mounting bracket. There is a large pin and you can adjust the angle of the engine to the transom. You want the thrust pretty close to parallel to the waterline on the boat and then you can use the power trim to adjust up or down.
 
Engine trim is like the advice you're getting. My 19 at higher power settings would porpoise also. That went away with the addition of a stabilizer on the outboard. I used a stingray brand. Lots of folks use the permatrim to good effect. The 19 needs the extra down force. Trim tabs too are good to have. George
 
George, I have Permatrim on my 22, and at high speeds and a lot of up trim, my boat will start to porpoise. I don't often get up to those kinds of speeds, but did want to know how it would handle.
 
The mono hull C Dories do better with both trim tabs and the Permatrims. (The smaller 16 probably is OK with plastic fins on the anti ventiallation (cavitation) plate. Using these, you can force the bow down, as well as get on a plane faster. Also putting the bow down, will give a better ride into rough water. However, going down wind/waves, and in some cases across large waves, you want the bow up slightly.

All of your problem is related to trim of the engine. Use the up and down trim button first to see how the boat reacts (the same button you use to raise the motor when trailering). You have very good advice from the other posters.
 
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