Has everyone been happy stretching the extra 10%?

Questions about modifying a design

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BillJ
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Has everyone been happy stretching the extra 10%?

Post by BillJ » Sat Jun 23, 2018 12:12 pm

On my upcoming Celerity build, in my mind, I believe the pros of having a slightly longer boat is worth the effort. Have any of you increased the length of the hull then regretted it later? Is the performance penalty worth worrying about? I could easily get away with building the Celerity the standard 14.5 foot length and be very pleased with it. 95% of the time I will be alone in it anyway. Engine wise I am considering an Etec 50 horse Evenrude. Should I consider the far heavier 75 horse if I stretch it out to 16 foot? I'd really like to keep the engine size down to the 50 if at all possible.

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mrintense
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Re: Has everyone been happy stretching the extra 10%?

Post by mrintense » Sat Jun 23, 2018 12:18 pm

I can't speak for the handling or the power requirements, but these boats were designed in a time when the average person was a bit shorter. Furthermore, what looks like plenty of room when first flipped starts looking a bit cramped when you start putting in the interior. Finally, there is no special difficulty in stretching the design if the plans allow it. Main thing is to remember to measure twice or even three times before committing to anything permanent.

I would have loved to stretch my Vera Cruise the extra 10%, however it's 21 feet just barely fits in my garage.
Carl
a.k.a. Clipper

Crafting a classically styled Vera Cruise

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Bill Edmundson
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Re: Has everyone been happy stretching the extra 10%?

Post by Bill Edmundson » Sat Jun 23, 2018 1:24 pm

I recommend the stretch for the reason Carl said!

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
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hoodman
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Re: Has everyone been happy stretching the extra 10%?

Post by hoodman » Sat Jun 23, 2018 2:53 pm

The stretch is no big deal to do but definitely a good idea in most cases. I don't think the boat will be significantly heavier to where you'll need a bigger motor. I believe on the Etecs the 60hp is the same weight as the 50. The weight jump comes with going up to the 75 as you say. I'm sure you'd be more than happy with 50-60 hp.
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

TomB
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Re: Has everyone been happy stretching the extra 10%?

Post by TomB » Sat Jun 23, 2018 3:06 pm

Stretch it. All the added length is in the cockpit.

If the boat weighs 600 lbs. as planned, the stretch would add less than 60 lbs since all the stretch happens between frames. If I'm wrong you will have to go with a smaller cooler. :D :D :D

Tom

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Bill Edmundson
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Re: Has everyone been happy stretching the extra 10%?

Post by Bill Edmundson » Sat Jun 23, 2018 3:13 pm

Bill

I would stretch the boat. The 50hp will push it nicely. The 75hp might give you 5 mph more and always use more gas.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

BillJ
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Re: Has everyone been happy stretching the extra 10%?

Post by BillJ » Sat Jun 23, 2018 3:15 pm

Matt,

I was born in New Orleans, grew up fishing with my dad at night on the Mississippi, but I swear you look way more like your from Nawlins than I do!

Glad I got that out of the way.

Anyway, yeah an additional 18" of just mainly hull shouldn't be much in weight for sure. Probably the any additional drag at the slow speeds I'll be going will not matter much either. 16' it will be then along with either the 50 or 60 Evenrude. Happy about getting these decisions made early and out of the way. Now I'll have extra time to dream about Craig's spaghetti!


BillJ

BillJ
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Re: Has everyone been happy stretching the extra 10%?

Post by BillJ » Sat Jun 23, 2018 3:17 pm

TomB wrote:Stretch it. All the added length is in the cockpit.

If the boat weighs 600 lbs. as planned, the stretch would add less than 60 lbs since all the stretch happens between frames. If I'm wrong you will have to go with a smaller cooler. :D :D :D

Tom
Noooooooooo, no smaller cooler, ill throw out one of the seats before doing that!

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kens
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Re: Has everyone been happy stretching the extra 10%?

Post by kens » Sat Jun 23, 2018 6:05 pm

" Is the performance penalty worth worrying about? "

there is no performance penalty.
remember, it takes more power to push beam, than, length.
length on the waterline adds to performance (if all other weights/volumes are equal)
also, the stretch adds buoyancy.
OH!, I stretched and I'm happy.
Oak is over rated, everything about it takes extra time; then it warps, splits or checks !!! :roll:

TomB
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Re: Has everyone been happy stretching the extra 10%?

Post by TomB » Sat Jun 23, 2018 6:27 pm

What was I thinking, coolers make great seats!

hoodman
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Re: Has everyone been happy stretching the extra 10%?

Post by hoodman » Sat Jun 23, 2018 6:33 pm

Bill, maybe I'll play "When the Saints..." at the gathering
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

BillJ
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Re: Has everyone been happy stretching the extra 10%?

Post by BillJ » Sat Jun 23, 2018 7:05 pm

kens wrote:" Is the performance penalty worth worrying about? "

there is no performance penalty.
remember, it takes more power to push beam, than, length.
length on the waterline adds to performance (if all other weights/volumes are equal)
also, the stretch adds buoyancy.
OH!, I stretched and I'm happy.
Ahhhhhhhhhh, hence in rowing competition, they rowboats are 8" wide and 40' long. I've done the land and air thing, behind on my sea.

BillJ
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Re: Has everyone been happy stretching the extra 10%?

Post by BillJ » Sat Jun 23, 2018 7:06 pm

hoodman wrote:Bill, maybe I'll play "When the Saints..." at the gathering
That would be awesome Matt!!!!!!! Love my New Orleans!

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