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Author Topic:   SPORT 15 Center Console: Engine Trim

Whaler888 posted 05-04-2006 02:14 PM ET (US)
I have just recently purchased a 1985 SPORT 15 CENTER CONSOLE with a 2004 Yamaha 60-HP engine. [Give me] suggestions for the engine trim position for maximum performance. With the engine in a lower position, [the helm] seems to pull hard to starboard. I appreciate any suggestions.
Buckda posted 05-04-2006 02:24 PM ET (US)
You should trim the motor out until you cannot get any more speed and then trim it back in a little from that point.
On my 15 with 70 HP motor, I could tell when it was dialed in because the steering, as you mentioned, went "neutral" when it was trimmed well. (this is a benefit - perhaps the only one - to having standard steering and not hydraulic)
It will be difficult for us to give you a specific answer for your rig, since every trim indicator may be different on different boats. If you have a trim indicator, then you should experiment until it feels best and then make mental note of that position.
If you don't have a trim indicator, well, it makes it even more difficult to be specific...but again, you should go by feel and dial it in to that zone where you can't get any more speed by trimming the engine out(up)..and then trimming it in just a "smidge" from there to get good prop grip.
Your trim needs will be continuously variable given specific sea conditions.
The other "rule of thumb" for trim is that the prop should be pushing parallel to the water's surface. This is often best indicated visually by gauging the powerhead cowling's top with the water surface.
Tom W Clark posted 05-04-2006 02:25 PM ET (US)
Trim can be adjusted to account to sea conditions or speed. That is what power trim is all about.
The steering torque can and should be corrected with the trim tab on the motor (vertical fin on the underside on the AV plate, behind the propeller).
Decide what trim angle works best for you under the most common conditions and then adjust the angle of the trim tab to make the steering "neutral" at that trim setting.
Whaler888 posted 05-04-2006 03:21 PM ET (US)
I appreciate the advice. Luckily the water conditions in Sarasota Bay are typically flat if not glassy allowing for ideal testing grounds. I look forward to implementing both suggestions this evening.
The Judge posted 05-04-2006 03:34 PM ET (US)
Bring it to Beercan this weekend, I'll show you how to run it:)
Basically it depends on speed but usually on a 15 they require a decent amount of trim. Never drive with it tucked in unless you have a good reason to. A good place to start is at least a verticle position and then up a few degrees. When running WOT trim that pig to the hills and when it starts to blow out or chine walk too bad, lower it down a smidge. I can also check your engine height as well, etc. Give me a buzz Nick 941-545-3808.
PS...wanna join our new West Coast Whaler club?
zotcha posted 05-04-2006 09:03 PM ET (US)
What up Nick? I am only twenty miles from the Georgia border. Does this "almost" include me in the Fla.-Ga.-Cuba Club? j/k. Did I read in another thread that you still possess a three wheeler? Didn't they try to outlaw those things about the time the quads were introduced? You must have some time logged in the Pines. Maybe Lacey Materials/Exit 74? Twelve consecutive Memorial Day Campouts. Gotta wonder how we're still here sometimes. zot.
runpasthefence posted 05-05-2006 01:41 AM ET (US)
On mostly flat water with no sharp turning involved I trim up as far as to lift the boat off of its lifting strakes. I can tell when this happens because the boats jumps a little to starboard and and there is a small jump in speed.
In my experience, turning while trimmed past the lifting strakes will cause porpoising into the turn. Just before a substantial turns at speed I trim the boat back onto the lifting strakes allowing it cut through a turn with any fuss.
Mick
jimh posted 05-05-2006 08:51 AM ET (US)
You mention two aspects of performance which are adjusted separately. These are covered in the Owner's Manual. The REFERENCE section has a HTML reproduction of the original owner's manul. The engine's trim/tilt is one adjustment. For advice on adjusting the engine's trim/tilt, see:
TILT PIN and POWER TILT & TRIM
http://continuouswave.com/whaler/reference/manual9-17/operations. html#trim
There is also the engine's trim tab on the anti-ventilation plate. For advice on adjusting the trim tab, see:
TRIM TAB ADJUSTMENT
http://continuouswave.com/whaler/reference/manual9-17/operations. html#trimTab

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Author	Topic: SPORT 15 Center Console: Engine Trim
Whaler888	posted 05-04-2006 02:14 PM ET (US) I have just recently purchased a 1985 SPORT 15 CENTER CONSOLE with a 2004 Yamaha 60-HP engine. [Give me] suggestions for the engine trim position for maximum performance. With the engine in a lower position, [the helm] seems to pull hard to starboard. I appreciate any suggestions.
Buckda	posted 05-04-2006 02:24 PM ET (US) You should trim the motor out until you cannot get any more speed and then trim it back in a little from that point. On my 15 with 70 HP motor, I could tell when it was dialed in because the steering, as you mentioned, went "neutral" when it was trimmed well. (this is a benefit - perhaps the only one - to having standard steering and not hydraulic) It will be difficult for us to give you a specific answer for your rig, since every trim indicator may be different on different boats. If you have a trim indicator, then you should experiment until it feels best and then make mental note of that position. If you don't have a trim indicator, well, it makes it even more difficult to be specific...but again, you should go by feel and dial it in to that zone where you can't get any more speed by trimming the engine out(up)..and then trimming it in just a "smidge" from there to get good prop grip. Your trim needs will be continuously variable given specific sea conditions. The other "rule of thumb" for trim is that the prop should be pushing parallel to the water's surface. This is often best indicated visually by gauging the powerhead cowling's top with the water surface.
Tom W Clark	posted 05-04-2006 02:25 PM ET (US) Trim can be adjusted to account to sea conditions or speed. That is what power trim is all about. The steering torque can and should be corrected with the trim tab on the motor (vertical fin on the underside on the AV plate, behind the propeller). Decide what trim angle works best for you under the most common conditions and then adjust the angle of the trim tab to make the steering "neutral" at that trim setting.
Whaler888	posted 05-04-2006 03:21 PM ET (US) I appreciate the advice. Luckily the water conditions in Sarasota Bay are typically flat if not glassy allowing for ideal testing grounds. I look forward to implementing both suggestions this evening.
The Judge	posted 05-04-2006 03:34 PM ET (US) Bring it to Beercan this weekend, I'll show you how to run it:) Basically it depends on speed but usually on a 15 they require a decent amount of trim. Never drive with it tucked in unless you have a good reason to. A good place to start is at least a verticle position and then up a few degrees. When running WOT trim that pig to the hills and when it starts to blow out or chine walk too bad, lower it down a smidge. I can also check your engine height as well, etc. Give me a buzz Nick 941-545-3808. PS...wanna join our new West Coast Whaler club?
zotcha	posted 05-04-2006 09:03 PM ET (US) What up Nick? I am only twenty miles from the Georgia border. Does this "almost" include me in the Fla.-Ga.-Cuba Club? j/k. Did I read in another thread that you still possess a three wheeler? Didn't they try to outlaw those things about the time the quads were introduced? You must have some time logged in the Pines. Maybe Lacey Materials/Exit 74? Twelve consecutive Memorial Day Campouts. Gotta wonder how we're still here sometimes. zot.
runpasthefence	posted 05-05-2006 01:41 AM ET (US) On mostly flat water with no sharp turning involved I trim up as far as to lift the boat off of its lifting strakes. I can tell when this happens because the boats jumps a little to starboard and and there is a small jump in speed. In my experience, turning while trimmed past the lifting strakes will cause porpoising into the turn. Just before a substantial turns at speed I trim the boat back onto the lifting strakes allowing it cut through a turn with any fuss. Mick
jimh	posted 05-05-2006 08:51 AM ET (US) You mention two aspects of performance which are adjusted separately. These are covered in the Owner's Manual. The REFERENCE section has a HTML reproduction of the original owner's manul. The engine's trim/tilt is one adjustment. For advice on adjusting the engine's trim/tilt, see: TILT PIN and POWER TILT & TRIM http://continuouswave.com/whaler/reference/manual9-17/operations. html#trim There is also the engine's trim tab on the anti-ventilation plate. For advice on adjusting the trim tab, see: TRIM TAB ADJUSTMENT http://continuouswave.com/whaler/reference/manual9-17/operations. html#trimTab