15hp getting low speeds

[evansjoem]

So I have my 1985 15hp Evinrude.  It is a long shaft motor on a short transom.  Is this the reason I'm only getting 10mph.


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[Princeton_Man]

On what kind and size boat?

[evansjoem]

14 semi-v Gregor


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[Princeton_Man]

14 semi-v Gregor


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I'm not familiar with the boat but I searched it out a little. The 14 foot H and U series weigh in around 900 lbs and they appeaar to have a relatively wide beam at 60" and  63". I'm leaning towards 10mph not being too bad. The long shaft could be slowing you down a little.

[evansjoem]

Ya I'm gonna put a jack plate on it to see if that helps


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[Princeton_Man]

That's a lot of boat for 15 ponies. Is there a max hp rating on it?

[Capt. BassinLou]

How fast were you expecting to go on a 15 horse? There are several factors contributing to the speed of your rig. Size, weight, fuel, gear, batteries, etc. Lastly, how many people are on the boat?

[Oldfart9999]

Raise the motor til the cavitation plate is level with the bottom of the hull and then play with the trim settings. Takes some time but I think you'll notice a big change.
Rodney

[evansjoem]

Thank you


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[evansjoem]

Thank you


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Building a side console


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[Oldfart9999]

Interesting, keep us posted on the work. I noticed one thing, it looks like a corner of the windshield is covering part of a hatch.?
Rodney

[evansjoem]

Interesting, keep us posted on the work. I noticed one thing, it looks like a corner of the windshield is covering part of a hatch.?
Rodney

No that is a seat pedestal mount that will be removed


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[LgMouthGambler]

You may just have a heavy boat. I have a 13ft V hull jon with a 5hp 4 stroke Mercury(Tihatsu) on it. Boat, deck, batteries, trolling motor, and gear probably bring the thing to a total of 500lbs. And I can do 15mph

[evansjoem]

You may just have a heavy boat. I have a 13ft V hull jon with a 5hp 4 stroke Mercury(Tihatsu) on it. Boat, deck, batteries, trolling motor, and gear probably bring the thing to a total of 500lbs. And I can do 15mph

I will play with it when I get the jack plate


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[evansjoem]

Now to clean it up and polish the face


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[evansjoem]

She is done


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[evansjoem]

Boat did awesome after months of building and testing


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[Princeton_Man]

Looks like you did pretty good yourself! Nice fish!

[Lipripper]

Great looking fish 

[evansjoem]

Thank u all


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[West6550]

Nice fish man, great job!

[evansjoem]

Thank you


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[icuOklaCity]

Not sure if the OP is still active in the fourms, but if you are what was the speed before you installed the Jack Plate and after what type of mph gain did you see..

I have a 1978 12' Deep V Gregor (U model)Conversion power by a 2016 Suzuki DF15 . with me and gear along with the added weight of both the decks I've add I still get 21.7 mph (gps). I've built a Jack Plate with 4-1/2" of setback and 4" of lift but have yet to install it . Hoping to gain 5-7 mph once installed...

[Lipripper]

Not sure if the OP is still active in the fourms, but if you are what was the speed before you installed the Jack Plate and after what type of mph gain did you see..

I have a 1978 12' Deep V Gregor (U model)Conversion power by a 2016 Suzuki DF15 . with me and gear along with the added weight of both the decks I've add I still get 21.7 mph (gps). I've built a Jack Plate with 4-1/2" of setback and 4" of lift but have yet to install it . Hoping to gain 5-7 mph once installed...

I see that he stopped by a few days ago even though he didn't post. Send him a PM and ask him your question he might answer his PM's