Strakes on a zip

Questions about modifying a design

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Dave goes fast
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Joined: Sun Aug 30, 2020 12:00 pm
Location: Lago Vista, TX

Strakes on a zip

Post by Dave goes fast »

I'm looking for thoughts and opinions on whether its a good Idea to add strakes or makes no difference. I plan on being able to hit 45-50 mph top speed and cruise speed about 30-35 mph. My thought was maybe they would give a little better control since I will run at a bit higher speed than most. The hull is in the glassing right now so I have to decide soon . Also wondering about skeg length and what is what most do. I have decided 6' , 2' forward of the transom. Just checking since the instructions just say it should end about half way between frame 4 and 5. I think mine is a bit short but sits nice at 6'.

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vupilot
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Re: Strakes on a zip

Post by vupilot »

I think 6ft is plenty for the skeg. I think mine was less and I liked the way the boat turned and tracked well.

My thoughts on strakes are you may not notice them much. I'm a minimalist, if its not a clear benefit, why spend the time on it. I don't see the clear benefit in this case.

Hercdrvr
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Location: McKinney TX

Re: Strakes on a zip

Post by Hercdrvr »

Agreed, 6ft of skeg is plenty. Getting a Zip through the water at 50mph will take some muscle, what’s your plan for power?
Matt B

Dave goes fast
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Joined: Sun Aug 30, 2020 12:00 pm
Location: Lago Vista, TX

Re: Strakes on a zip

Post by Dave goes fast »

65 hp merc. Prop 11x 17 but I need to keep the weight below about 850lbs and I'm not sure I can do that. I'm probably dreaming at 50 but 45 might be more realistic. I'm already adding more wood and glass than the original plans. Hopefully flipping the hull in a couple weeks.

Hercdrvr
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Re: Strakes on a zip

Post by Hercdrvr »

I would really like to ride in a Zip at 50 mph, that would be an exhilarating experience ! I’m guessing an 850 lb Zip with 65 hp will run about 40. It takes so much more muscle to get past 40, it’s hardly worth it. Keep us posted on your progress.
Matt B

AdamNMel
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Location: Lake Alfred, Florida

Re: Strakes on a zip

Post by AdamNMel »

I have Roberta’s old Zip it was built on the heavy side and has a lighter 2 stroke Mercury 50 HP, the little boat tops out at 29-30 MPH no matter how we load it.

It only has the Skeg which I think is about 6’

Hope to hear if you actually get it about 35-40.

You will need trim tabs and weight in the Bow, before I did that it would Porpoise with any chop on the water.

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Roberta
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Location: East Troy, Wisconsin

Re: Strakes on a zip

Post by Roberta »

I had a friend who had a Zip built by a racing boat builder in California. They built it extremely light and stepped the hull kinda like a hydro. He powered it with a Merc 850XS, which is a racing engine. I don't think he ever hit 50mph and I don't think it was much fun at speed.

Here is a link to the boat:

http://www.antiqueboatamerica.com/Boat/31776

Roberta
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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Roberta
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Re: Strakes on a zip

Post by Roberta »

Here is another link to a thread in the forum.

https://www.glen-l.com/phpBB2/viewtopic.php?t=16273

Roberta
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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