Search found 145 matches

by sproggy
Mon Apr 16, 2018 2:47 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

The one step forwards is starting on my build form last night. The realities of building a 15'6" boat in a 16'6" long garage - it's going to be tight: http://boatbuilders.glen-l.com/wp-content/gallery/inboard-zip-by-ian-spring-welwyn-garden-city-uk/Length.JPG Not all that timber is for the...
by sproggy
Tue Apr 10, 2018 7:35 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

OK, Tom, you've convinced me :-) My frame spacing is 26 inches so not very different from yours - an equal lack of space to move around.

Sounds like a job to start this evening before I dismantle my large work table later in the week to make space for the build form.
by sproggy
Tue Apr 10, 2018 6:18 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

Bill, I thought about doing that but there are so many aspects that are subject to change that I wondered whether it was worth doing now. Maybe I'll compromise and encapsulate the forward two frames and stem (where access afterwards is probably most difficult and change is less likely) and then leav...
by sproggy
Tue Apr 10, 2018 1:23 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

The frames are now all epoxied and the chine and sheer notches cut. http://boatbuilders.glen-l.com/wp-content/gallery/inboard-zip-by-ian-spring-welwyn-garden-city-uk/frames_bonded.jpg Frames 5 1/2 and 4 curing in the house because it's cold in the garage. http://boatbuilders.glen-l.com/wp-content/ga...
by sproggy
Fri Apr 06, 2018 10:36 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

The scores are in. An order of mainly utile (sipo) but with some douglas fir for the transom formers and some WRC for a canoe project comes to £863 including tax. The entire order in yellow cedar (slightly more board feet due to different board sizes) comes out at £661. So quite a difference, and I ...
by sproggy
Thu Apr 05, 2018 7:32 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

hoodman wrote:Keep the nails towards the center of the keel so that when you go to fair the keel you won't get into the hardware.


Good tip - I had in mind to just bond the ply to the keel but nailing it probably makes sense.
by sproggy
Thu Apr 05, 2018 5:49 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

I'm not sure whether I read it in the Zip build instructions or in the BBWP book but that's what I intend to do. Around the motor mount (aft of frame 1) the keel will be somewhere between 6" and 8" wide, laminated to double thickness with solid timber. But forward of there I'll laminate wi...
by sproggy
Thu Apr 05, 2018 5:23 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

My concern with scarfing the keel is that my motor will be bolted directly to it. Or at least the 'lower leg' will be. And I don't want to introduce even the slightest weakness anywhere near that point. I know epoxy is supposed to be stronger than the wood but....you know....just in case.
by sproggy
Thu Apr 05, 2018 4:51 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

I'm about to order timber for the keel, chines and sheer. My usual supplier isn't offering me the lengths I need in white oak, particularly for the 13' keel which I really don't want to have to scarf. I've contacted another supplier and they're pushing me towards yellow cedar, suggesting it's a far ...
by sproggy
Mon Apr 02, 2018 1:42 am
Forum: Hankinson designs
Topic: Key Largo build. Tahmoor (nr. Sydney) Australia
Replies: 21
Views: 966

Re: Key Largo build. Tahmoor (nr. Sydney) Australia

Welcome, Rob. Wife + daughter (mine is 2 years old) = very little spare time at all! I spend some evenings and a few 'stolen' weekend hours in my garage but I don't expect my Zip will be done in 3 years. Deadlines are there to be missed! But to my mind it's more important to enjoy the build than to ...
by sproggy
Fri Mar 30, 2018 12:24 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

Thanks for that, Paul - really interesting and very close to what I'm intending to do. The main difference is I want 4-stroke rather than 2-stroke and that usually comes with a through-prop exhaust so I think I can add tricky exhaust routing to tricky cooling routing. Unless I just run an external e...
by sproggy
Thu Mar 29, 2018 6:35 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 56
Views: 2815

Re: UK Zip Build

Well I wrote quite a long post, saved it as a draft while I did some work, then came back, finished it and submitted it and......it's disappeared :( So the brief version: Frames now complete, dry assembled. Gussets are boring! I'm looking at a stretch of 11" to get the motor installed behind th...
by sproggy
Mon Mar 26, 2018 1:51 am
Forum: Design Modifications
Topic: Rudder size for inboard Zip
Replies: 4
Views: 522

Re: Rudder size for inboard Zip

Well those Professional Boatbuilder articles were certainly useful - information that I'd spent hours looking for but hadn't previously found. They reckon for a planing hull, rudder area is 0.018 x LWL x Draft which in the case of the Zip is 148 x 4.5 x 0.018 = 12 sq inches. But that's nowhere near ...
by sproggy
Mon Mar 26, 2018 12:43 am
Forum: Design Modifications
Topic: Rudder size for inboard Zip
Replies: 4
Views: 522

Re: Rudder size for inboard Zip

Bill, Steve, thank you for your replies. The Zip has an LWL of 12'4" and a draft, assuming it sits at the DWL, of only 4". Perhaps closer to 4.5" if you add the thickness of the bottom planking. Prop diameter will be something around or slightly over 11". I'm guessing at this sta...
by sproggy
Fri Mar 23, 2018 7:39 am
Forum: Design Modifications
Topic: Rudder size for inboard Zip
Replies: 4
Views: 522

Rudder size for inboard Zip

As posted elsewhere, I'm building a Zip with an inboard-mounted motor. The mounting position of that motor determines the location (and therefore the shape) of an extra lower frame I'm adding but the position of the motor is influenced by the position of the rudder. And the position of the rudder is...

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