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Boat getting on plane problems! Help

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Boat getting on plane problems! Help

Old 03-14-2019, 04:20 PM
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Default Boat getting on plane problems! Help

I bought a used 1990 14 ft fiberglass bomber bas boat, and I'm having problems getting on plane. The outboard is a 1989 35 hp mercury. After I bought it I noticed they didn't have a thrust washer and it has tore the prop and gear housing up. I have purchased a thrust washer and new prop I haven't put it in the water yet after the new prop, but do you think I'm having problems because of the gear housing being tore up?
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Old 03-14-2019, 06:40 PM
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Probably
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Old 03-14-2019, 07:02 PM
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Pictures
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Old 03-14-2019, 07:03 PM
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Try it out.
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Old 03-14-2019, 10:53 PM
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Originally Posted by 757saltwater View Post
Pictures
how do I post pics, it keeps telling me I need 10 post before I can post a url, every time I try to upload pics.
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Old 03-15-2019, 02:52 AM
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Originally Posted by Kerber863 View Post
how do I post pics, it keeps telling me I need 10 post before I can post a url, every time I try to upload pics.
well, you have 2 posts...only 8 more to go and then you can post pictures
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Old 03-15-2019, 02:58 AM
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The merc prop has a sleeve that fits maybe 3/8" into the housing so unless the old prop ground up that much of the housing (unlikely) there's no worry of exhaust gasses coming out in front of the prop causing cavitation.

The 35 is a little shy for a 14' fiberglass. I ran a 50 merc on a 13.5' fiberglass runabout. I'd install a hydrofoil on the cavitation plate. If it's heavily weighted in the stern thrown on set of SmartTabs SX too. That'll bring it up on plane at much lower RPMs for better fuel economy.
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Old 03-15-2019, 05:24 AM
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Originally Posted by Scupperz View Post
The merc prop has a sleeve that fits maybe 3/8" into the housing so unless the old prop ground up that much of the housing (unlikely) there's no worry of exhaust gasses coming out in front of the prop causing cavitation.

The 35 is a little shy for a 14' fiberglass. I ran a 50 merc on a 13.5' fiberglass runabout. I'd install a hydrofoil on the cavitation plate. If it's heavily weighted in the stern thrown on set of SmartTabs SX too. That'll bring it up on plane at much lower RPMs for better fuel economy.
it does have a hydrofoil, but no smarttabs. I bought a new prop for it, but with the thrust washer on it doesn't go into the gear housing at all. There is a gap from the end of the prop to the housing.
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Old 03-15-2019, 05:25 AM
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Originally Posted by captbone View Post
Try it out.
I am going to try it out tomorrow, hopefully there is a difference
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Old 03-15-2019, 05:44 AM
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Originally Posted by Scupperz View Post
The 35 is a little shy for a 14' fiberglass. I ran a 50 merc on a 13.5' fiberglass runabout. I'd install a hydrofoil on the cavitation plate. If it's heavily weighted in the stern thrown on set of SmartTabs SX too. That'll bring it up on plane at much lower RPMs for better fuel economy.
35 should be fine in terms of power - when I was a kid, our family boat was 17'6" with a cabin and even with the whole family onboard (5 of us) 35hp (also a two cylinder Merc) would get it on the plane OK, no smart tabs or doel fin - no ball of fire of course, but it didn't have a problem getting on the plane.
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Old 03-15-2019, 05:49 AM
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Originally Posted by Kerber863 View Post
it does have a hydrofoil, but no smarttabs. I bought a new prop for it, but with the thrust washer on it doesn't go into the gear housing at all. There is a gap from the end of the prop to the housing.
Whelp, that gap is going to allow exhaust gas out in front of the prop causing cavitation (prop turning air). Could be the reason it's having issues getting on plane. You might be able to rig something to the housing to take up the gap otherwise it'll need a new lower unit to restore the exhaust seal.
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Old 03-15-2019, 05:49 AM
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Originally Posted by Clinker View Post
35 should be fine in terms of power - when I was a kid, our family boat was 17'6" with a cabin and even with the whole family onboard (5 of us) 35hp (also a two cylinder Merc) would get it on the plane OK, no smart tabs or doel fin - no ball of fire of course, but it didn't have a problem getting on the plane.
yea I feel it should be able to get on plane. The back of the boat seems to bog down with it trimmed all the way down.
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Old 03-15-2019, 06:01 AM
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Originally Posted by Kerber863 View Post
how do I post pics, it keeps telling me I need 10 post before I can post a url, every time I try to upload pics.
Must be a clue no ?
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Old 03-15-2019, 06:23 AM
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I am very familiar with Bomber Bass boats.The early models had no stringer system they filled space between the floor and the deck with foam .The foam they used at that time absorbed water.They became known as two ton bombers.
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Old 03-17-2019, 07:44 AM
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Originally Posted by captbone View Post
Try it out.
tried it and it still doesn't get on plane, I think I have a other issue then the prop.
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Old 03-17-2019, 07:47 AM
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Originally Posted by TNBuras View Post
I am very familiar with Bomber Bass boats.The early models had no stringer system they filled space between the floor and the deck with foam .The foam they used at that time absorbed water.They became known as two ton bombers.
how would I be able to find out if the foam has absorbed with water? Just try to pick up on it? The boat sits kind weird on the water also, it looks like a trihull at the front but it goes to a v bottom towards the back
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Old 03-17-2019, 07:49 AM
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What pitch prop are you running? Not sure which is right, but guessing about 15". Much above that and engine can bog.

Also, does engine rev high when trying to plane or is it stuck at a lower rpm?
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Old 03-17-2019, 07:56 AM
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Originally Posted by Corndog38 View Post
What pitch prop are you running? Not sure which is right, but guessing about 15". Much above that and engine can bog.

Also, does engine rev high when trying to plane or is it stuck at a lower rpm?
the prop that was on it when I bought it was a 16 pitch and I just bought a new one at 13 pitch. I feel it rev high, but I don't have anything to tell the rpms
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Old 03-17-2019, 08:36 AM
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Post a picture of the engine on the transom and of the lower unit.

We can help.
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