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subaru6
Joined: 11 Oct 2013
Posts: 2
Location: Peace River
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 Posted: Fri Oct 11, 2013 2:09 pm Post subject: 2008 thunderjet N.E envoy |
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| i changed my impellar form a AA to A on my SD309 because my impellar needed to replaced. On the advice from a guy that works on boats, he said it would not make much of a difference, but now my boat is porpoising. Does anyone know if the impellar change would cause this ? |
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mountainman
Joined: 15 Jan 2006
Posts: 131
Location: Grande Prairie, Alberta
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| Posted: Sat Oct 12, 2013 10:30 am Post subject: |
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Porpoising is caused by improper weight distribution for the most part, try moving more weight to the front of the boat, if you have trim tabs set them lower to bring the front down.
I'm guessing you gained a bit of top end with the impeller switch. |
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blen
Joined: 31 Oct 2006
Posts: 53
Location: Vancouver
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| Posted: Sat Oct 12, 2013 5:40 pm Post subject: |
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| Your going faster. |
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subaru6
Joined: 11 Oct 2013
Posts: 2
Location: Peace River
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| Posted: Tue Oct 15, 2013 11:34 am Post subject: 2008 thunderjet N.E envoy |
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| I have no trim tabs to adjust. Going at 32 mph and 3400 rpm it starts tp porpoise |
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