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How Edwing built their hulls
Posted: Fri Aug 20, 2010 8:18 pm
by Chaps
So I'm re-doing the bottom on my 21 Edwing and I've been reminded as I look up at it that I've always liked how Edwin designed and put this thing together. I really think its a great riding and efficient boat and the build is super strong.
The unique feature of this boat is that one single piece of 1/4" plate is formed to create an entire 1/2 hull from keel to the gunwale rubrail. In other words the chine is bent, no welds. Not only is it a bent chine but it also has a 4" reverse chine that is also bent. To top it off the keel has another bend that creates a delta-conic step that starts about mid-ship as a point and gradually widens as it approaches the transom and the engine bracket.
Check it out:
![P8200007.jpg](./download/file.php?id=2328&sid=717cd8bd0144f931761841c32b7780cf)
- P8200007.jpg (155.06 KiB) Viewed 8545 times
Of course as the run to the bow occurs the plate is relieved and bent inwards to make the pointy end so there is some welding at the chine at that juncture but all the same, i don't believe I've seen this configuration on any other skiff sized alloy boat. Needless to say it took a pretty good sized press brake to form this up.
I believe he only did this on his 21' hulls which he made in several configurations. Mine is the only center console with this hull he ever made as far as I know.
I took these pictures with the gray epoxy barrier coat paint applied over acid etch primer. Next comes 2 coats of Vivid bottom paint in black.
A couple of more views:
![P8200009.jpg](./download/file.php?id=2329&sid=717cd8bd0144f931761841c32b7780cf)
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![P8200017.jpg](./download/file.php?id=2330&sid=717cd8bd0144f931761841c32b7780cf)
- P8200017.jpg (86.82 KiB) Viewed 8545 times
![P8200018.jpg](./download/file.php?id=2331&sid=717cd8bd0144f931761841c32b7780cf)
- P8200018.jpg (328.4 KiB) Viewed 8545 times
Re: How Edwing built their hulls
Posted: Fri Aug 20, 2010 9:57 pm
by MacCTD
Great looking boat, how does it perform with the 90?
Re: How Edwing built their hulls
Posted: Fri Aug 20, 2010 10:14 pm
by AlloyToy
Very nice bottom side....... I know the changes I made to my hull which were minor have offered quite a noticeable performance difference in the slop
Mine is no longer a Pacific....it's a Pacific Alloy built in WA and modified & re-engineered
BETTER in MA
I bet the ride is comfortable
Do they still build boats
![Question :?:](./images/smilies/icon_question.gif)
Re: How Edwing built their hulls
Posted: Fri Aug 20, 2010 10:32 pm
by Chaps
MacCTD wrote:Great looking boat, how does it perform with the 90?
An easy cruise just up on plane is 14 knots, at about 5100 its doing 23 and flat out at 6200 its at about 28. The boat has a 15" pitch workboat prop because its used for towing so top speed is modest but it will pull a 40' trawler at 8 knots without breaking a sweat . . . mpg at 16 knots is about 5.5 in light chop and no load
AT
No, its been a few years since Ed hung it up . . . Sculpin up on Vancouver Island has one of his bigger ones with a cabin but I don't believe the hull is like this.
Re: How Edwing built their hulls
Posted: Sat Aug 21, 2010 8:20 pm
by MacCTD
Love to see some more pictures of the boat, do you have pictures of the deck and cabin? How big of a motor is it rated for?
Re: How Edwing built their hulls
Posted: Sat Aug 21, 2010 10:57 pm
by Chaps
Re: How Edwing built their hulls
Posted: Sun Aug 22, 2010 9:37 am
by Illgotoo
> The unique feature of this boat is that one single piece of 1/4" plate is formed to create an entire 1/2 hull from keel to the gunwale rubrail.
So three pieces of sheet Al are used in the hull? Two sides and a keel. I guess that flat triangle plate makes four.
That does seem unique.
Five piece hulls are common -- or at least not unique. A keel. Two bottom pieces up to the chine. And then two side pieces from the chine to the gunnel.
I'm told that separate pieces need to be welded to get the right hull shape because a single piece cannot be bent to that shape. I guess Edwing figured out a way to bend a single piece.
BTW - Nice clean hull now. Looks great!
Re: How Edwing built their hulls
Posted: Sun Aug 22, 2010 10:30 am
by Chaps
Illgotoo wrote:> The unique feature of this boat is that one single piece of 1/4" plate is formed to create an entire 1/2 hull from keel to the gunwale rubrail.
So three pieces of sheet Al are used in the hull? Two sides and a keel. I guess that flat triangle plate makes four.
That does seem unique.
Five piece hulls are common -- or at least not unique. A keel. Two bottom pieces up to the chine. And then two side pieces from the chine to the gunnel.
I'm told that separate pieces need to be welded to get the right hull shape because a single piece cannot be bent to that shape. I guess Edwing figured out a way to bend a single piece.
BTW - Nice clean hull now. Looks great!
Tom, sorry, its one piece from the middle of the triangle plate to the top of the gunwale. See the weld down the middle at the keel line? That's the only weld in the main portion of the hull. Each hull side and bottom (to the keel) are all from one 10' x 20' sheet of 1/4" 5086 bent in three places.
Re: How Edwing built their hulls
Posted: Sun Aug 22, 2010 11:05 am
by Illgotoo
Thanks, Chaps, I see it now. The triangle is not a separate piece.
Is the keel a separate piece? Or is it the line made by the weld of the two side pieces?
Re: How Edwing built their hulls
Posted: Mon Aug 23, 2010 12:39 pm
by Sobie2
Chaps,
That homemade boat lift you built is pretty sweet. Lots of uses too.
Sobie2
Re: How Edwing built their hulls
Posted: Mon Aug 23, 2010 1:33 pm
by JETTYWOLF
Yep, Similar to a Pacific, as the bottom of the Pacific hulls are one piece with breaks for the chines.
I have mine so there is no hull penatrations up under it.
Chap's is that saddle tanks along the insides under the gunnel area??
Re: How Edwing built their hulls
Posted: Mon Aug 23, 2010 2:04 pm
by AlloyToy
Pacific doesn't have a true reverse chine like the under side of this boat....Pacific uses a chine molding where the bottom meets the sides
They do however cold form those strakes into the bottom of the hull...
When my boat was at Winninghoff it was neat to see how the builders build that reverse chine into the hull design
Re: How Edwing built their hulls
Posted: Mon Aug 23, 2010 8:01 pm
by Chaps
JETTYWOLF wrote:
Chap's is that saddle tanks along the insides under the gunnel area??
Yeah, 20 gallons a side. Whats nice is I can unbolt them and clean them out easily which is handy at times.
Re: How Edwing built their hulls
Posted: Tue Aug 24, 2010 7:27 pm
by JETTYWOLF
I gotz me some HAWK-EYES.
Re: How Edwing built their hulls
Posted: Fri Aug 27, 2010 7:59 am
by JETTYWOLF
AlloyToy wrote:Pacific doesn't have a true reverse chine like the under side of this boat....Pacific uses a chine molding where the bottom meets the sides
They do however cold form those strakes into the bottom of the hull...
When my boat was at Winninghoff it was neat to see how the builders build that reverse chine into the hull design
That's what I meant ALLOY.
Chines....molded in to a all one piece bottom, Illgotoo. Can be done quite nicely.
Re: How Edwing built their hulls
Posted: Fri Aug 27, 2010 6:49 pm
by AlloyToy
10-4 good buddy
![right-on! :thumbsup:](./images/smilies/thumbsup.gif)
OH
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
And I like that photo of the Alloy Jettycraft
![beer :beer:](./images/smilies/beer_cheer.gif)
Re: How Edwing built their hulls
Posted: Tue Jun 21, 2011 12:00 am
by Sculpin
Chaps wrote:
. . . Sculpin up on Vancouver Island has one of his bigger ones with a cabin but I don't believe the hull is like this.
Sorry for the holiday away from the site. My hull is identical build wise to yours just a bit bigger. Great hull really. I think Ed has great designs and it is too bad his computer crashed and he losts all the files. If someone was to pick up where he started and make a nicer finished boat they would be really nice IMHO.
Re: How Edwing built their hulls
Posted: Tue Jun 21, 2011 12:37 pm
by pjay9
Been reading thru this and the pics of the bottom with the flat triangle at the stern was employed by the Tacoma boat builder of BellBouy (fake lap-streak sides) and Sabercraft (smooth sides) with same interiors back in the 70-80's...forgot what they called it back them...but it really helped to plane it out in a hurry. Capt PJ
Re: How Edwing built their hulls
Posted: Tue Jun 21, 2011 2:48 pm
by Sculpin
pjay9 wrote:Been reading thru this and the pics of the bottom with the flat triangle at the stern was employed by the Tacoma boat builder of BellBouy (fake lap-streak sides) and Sabercraft (smooth sides) with same interiors back in the 70-80's...forgot what they called it back them...but it really helped to plane it out in a hurry. Capt PJ
Delta planing pad is a pretty commonly used term.