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#1
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A friend on mine just bought a used Stratos 20' bass boat with a 250
Yamaha Vmax. He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? I'll admit it - I'm stumped. |
#2
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Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250 Yamaha Vmax. He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? I'll admit it - I'm stumped. Try putting 100 pounds of weight at the bow and see if that helps. |
#3
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On Sun, 26 Jul 2009 21:45:54 -0400, J i m
wrote: Wizard of Woodstock wrote: A friend on mine just bought a used Stratos 20' bass boat with a 250 Yamaha Vmax. He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? I'll admit it - I'm stumped. Try putting 100 pounds of weight at the bow and see if that helps. We did - he's lighter than I am, but we both sat on the front deck - didn't help. |
#4
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![]() "J i m" wrote in message ... Wizard of Woodstock wrote: A friend on mine just bought a used Stratos 20' bass boat with a 250 Yamaha Vmax. He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? I'll admit it - I'm stumped. Try putting 100 pounds of weight at the bow and see if that helps. I had a Robalo that handled like that. No matter how I trimmed it, it porpised and chine walked in turns. I mentioned it to a guy at work who took it and adjusted the mounting height of the engine on the transom. All the porposing and other squirrely handling symptoms disappeared. Eisboch |
#5
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On Jul 26, 9:00*pm, "Eisboch" wrote:
"J i m" wrote in ... Wizard of Woodstock wrote: A friend on mine just bought a used Stratos 20' bass boat with a 250 Yamaha Vmax. *He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. *No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? *I'll admit it - I'm stumped. Try putting 100 pounds of weight at the bow and see if that helps. I had a Robalo that handled like that. *No matter how I trimmed it, it porpised and chine walked in turns. *I mentioned it to a guy at work who took it and adjusted the mounting height of the engine on the transom. *All the porposing and other squirrely handling symptoms disappeared. Eisboch Not an expert in such, but I was going to say . I think the guy needs a jack plate. |
#6
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On Sun, 26 Jul 2009 22:00:22 -0400, "Eisboch"
wrote: "J i m" wrote in message ... Wizard of Woodstock wrote: A friend on mine just bought a used Stratos 20' bass boat with a 250 Yamaha Vmax. He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? I'll admit it - I'm stumped. Try putting 100 pounds of weight at the bow and see if that helps. I had a Robalo that handled like that. No matter how I trimmed it, it porpised and chine walked in turns. I mentioned it to a guy at work who took it and adjusted the mounting height of the engine on the transom. All the porposing and other squirrely handling symptoms disappeared. Yeah - that was a thought. My own experience with jack plates would seem to indicate that it would help more than hurt. And as it happens, I have a mechanical jack plate sitting in the garage. |
#7
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Wizard of Woodstock wrote:
A friend on mine just bought a used Stratos 20' bass boat with a 250 Yamaha Vmax. He called this afternoon and asked me to take a ride with him because he couldn't get his boat to plane right. We met up at Webster Lake and took it for a ride after checking everything over - everything seemed to be working, nothing out of sorts with the hull. Got on the water and it's the oddest thing - no matter what trim position, the boat would porpise (pitch) at speed. Vary the speed and you'd get a yawing action - trim made no difference. No roll to speak of. All the bolts are tight, properly torgued, the prop is symmetrical, the skeg on the outboard is straight, keel is straight - no obvious repairs. Any ideas? I'll admit it - I'm stumped. The engine is mounted in the wrong set of holes, maybe. It's also a lot of engine weight for a 20' boat. -- Whatever moral rules you have proposed, abide by them as they were laws, and as if you would be guilty of impiety by violating any of them, *unless* you are a conservative Republican office holder or minister. If that is your position in life, then anything goes. |
#8
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![]() "Wizard of Woodstock" wrote in message ... On Sun, 26 Jul 2009 22:00:22 -0400, "Eisboch" wrote: I had a Robalo that handled like that. No matter how I trimmed it, it porpised and chine walked in turns. I mentioned it to a guy at work who took it and adjusted the mounting height of the engine on the transom. All the porposing and other squirrely handling symptoms disappeared. Yeah - that was a thought. My own experience with jack plates would seem to indicate that it would help more than hurt. And as it happens, I have a mechanical jack plate sitting in the garage. In my case, a jack plate wasn't required. The bolts holding the engine on the transom were removed with the engine strapped to a fork truck. It was either lowered or raised (can't remember which) by one mounting hole and reattached. It made a huge difference. The chine walking was scary on that boat when making turns at high speeds and the porposing was obviously annoying. The motor height adjustment completely eliminated both. It didn't take much. Eisboch |
#9
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On Mon, 27 Jul 2009 05:48:00 -0400, "Eisboch"
wrote: "Wizard of Woodstock" wrote in message .. . On Sun, 26 Jul 2009 22:00:22 -0400, "Eisboch" wrote: I had a Robalo that handled like that. No matter how I trimmed it, it porpised and chine walked in turns. I mentioned it to a guy at work who took it and adjusted the mounting height of the engine on the transom. All the porposing and other squirrely handling symptoms disappeared. Yeah - that was a thought. My own experience with jack plates would seem to indicate that it would help more than hurt. And as it happens, I have a mechanical jack plate sitting in the garage. In my case, a jack plate wasn't required. The bolts holding the engine on the transom were removed with the engine strapped to a fork truck. It was either lowered or raised (can't remember which) by one mounting hole and reattached. It made a huge difference. The chine walking was scary on that boat when making turns at high speeds and the porposing was obviously annoying. The motor height adjustment completely eliminated both. It didn't take much. I'll have to take a look at where it's mounted on the engine bracket. It's a short shaft, so I imagine there isn't a lot of room to play with. |
#10
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On Mon, 27 Jul 2009 08:46:11 -0400, Gene Kearns
wrote: On Sun, 26 Jul 2009 21:36:46 -0400, Wizard of Woodstock penned the following well considered thoughts to the readers of rec.boats: |A friend on mine just bought a used Stratos 20' bass boat with a 250 |Yamaha Vmax. He called this afternoon and asked me to take a ride |with him because he couldn't get his boat to plane right. | |We met up at Webster Lake and took it for a ride after checking |everything over - everything seemed to be working, nothing out of |sorts with the hull. | |Got on the water and it's the oddest thing - no matter what trim |position, the boat would porpise (pitch) at speed. Vary the speed and |you'd get a yawing action - trim made no difference. No roll to speak |of. | |All the bolts are tight, properly torgued, the prop is symmetrical, |the skeg on the outboard is straight, keel is straight - no obvious |repairs. | |Any ideas? I'll admit it - I'm stumped. Given the available information, the only thing it *could* be is that the motor is mounted too low. Has it ever planed correctly? If so, what changed... Don't know - it's a used boat, low hours Yamaha. We're going to take it out again this morning. He owns a independant car repair place, so we're all set with lifts and such. I know on my Ranger, I had problems with the FICHT short shaft engine on the 620 based hull - it was never quite right and just playing with the fixed height positioning didn't solve the problems - some would go away, others would show up. It wasn't until I put the jack plate and 25" shaft engine that I could really dial in the engine positioning to solve ALL the problems in addition to gaining 6 inches in length which also helped. |
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