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by sproggy
Mon Sep 17, 2018 11:51 am
Forum: Small outboards
Topic: Smallest motor on Zip?
Replies: 6
Views: 167

Re: Smallest motor on Zip?

Pretty much all inland waterways (rivers and lakes) in the UK are subject to a 4/5/6mph speed limit with the exception of a few small waterski lakes. The only place you can go faster is on the sea or estuaries and the Zip isn't built for speed on rough water. You might get the odd super-calm day on ...
by sproggy
Mon Sep 17, 2018 8:58 am
Forum: Small outboards
Topic: Smallest motor on Zip?
Replies: 6
Views: 167

Re: Smallest motor on Zip?

How big do you go 'just in case'? :lol: I figure 10hp would easily be enough for 6mph but a 15hp would be working less hard.... I don't think many of the boat speed calculations are effective at such low powers/speeds for planing hulls. I was originally going for a Yamaha F25 which is a twin (unusua...
by sproggy
Mon Sep 17, 2018 7:39 am
Forum: Small outboards
Topic: Smallest motor on Zip?
Replies: 6
Views: 167

Smallest motor on Zip?

I know people usually ask "what's the biggest motor I can fit to a.......?". Well this is the opposite. What's the smallest motor anyone's fitted to a Zip? I spent some time wandering around boats last week and a 25hp Yamaha motor, which I was planning around, is physically pretty big. Giv...
by sproggy
Fri Aug 31, 2018 7:35 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 85
Views: 13943

Re: UK Zip Build

The sheerline will be raised 3" in total but the sheer timber itself is raised only 1" at the bow, progressing to 3" up at the transom. The additional 2" at the bow will be achieved with a 2" thick cover board edge (not the entire cover board) which will taper down towards t...
by sproggy
Fri Aug 31, 2018 1:31 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 85
Views: 13943

Re: UK Zip Build

New stem and breasthook fitted. I nearly made the same mistake as the first time with the height of the blocking - I've raised the sheer by an inch (forward) so I raised the blocking an inch to compensate.......except I should have dropped it an inch instead. I wasn't thinking upside down. So the or...
by sproggy
Fri Aug 24, 2018 3:21 am
Forum: New Members, Please Introduce Yourself
Topic: New member kent UK.
Replies: 1
Views: 290

Re: New member kent UK.

Welcome, Stuart - there are a few of us in the UK.

A flying saucer is perhaps an unusual choice for estuary use - you'll need to choose calm days! And you're using jet power? I'll watch your build with interest as I considered jet power for my Zip too.
by sproggy
Mon Aug 20, 2018 6:23 am
Forum: Epoxy
Topic: Epoxi and European Oak?
Replies: 6
Views: 1515

Re: Epoxi and European Oak?

I'm using West epoxy with oak and it seems fine. In fact because of some of the scare stories I tested a few bonded off-cuts - both oak to oak and oak to ply. I even soaked one in water (to allow the oak to expand) for a few days and still the wood failed when I attacked it, not the epoxy. It wasn't...
by sproggy
Thu Aug 16, 2018 8:07 am
Forum: New Members, Please Introduce Yourself
Topic: Hello from Belgium
Replies: 3
Views: 232

Re: Hello from Belgium

Welcome, Folgore!

Are you thinking of building a Glen-L design? Have you any thoughts about which one? I'm building a Zip in the UK.

Ian
by sproggy
Wed Aug 08, 2018 12:56 am
Forum: Small outboards
Topic: Stephens Zip
Replies: 63
Views: 4021

Re: Stephens Zip

Wait on the notches until you are ready to lay in the shears and chines so you can angle them based on the direction that the longitudinals bend. I think he meant the notches in the build form for frames 5 1/2 and 4. I just cut mine with a regular saw, slightly shallower than specified. Then final ...
by sproggy
Thu Aug 02, 2018 7:22 am
Forum: Electric Power
Topic: Electric drive "ED"
Replies: 4
Views: 290

Re: Electric drive "ED"

Ah, if you're getting rid of the belts then that opens up more power options. Watch the gearing, though. The ED design allows you to effectively gear the motor to the outboard leg via different sized pulleys. If you're going for a direct drive via a coupling you won't have that capability. Electric ...
by sproggy
Thu Aug 02, 2018 6:36 am
Forum: Electric Power
Topic: Electric drive "ED"
Replies: 4
Views: 290

Re: Electric drive "ED"

Steering would be more similar to an outboard than to an inboard because you steer by turning the outboard lower leg, directing the thrust where you want it. So you'd have good manoeuvrability at low speed which you don't get with an inboard and separate rudder. On the downside, low speed is the onl...
by sproggy
Thu Jul 26, 2018 11:57 am
Forum: Power Boats
Topic: What do call this type of sheer?
Replies: 15
Views: 888

Re: What do call this type of sheer?

Soloboat wrote:I think it is called a Hogged Sheer.


A hogged sheer is when the forward and aft ends of the sheerline are lower than the centre (or some point between them). Like this (except usually on purpose......):

Image
by sproggy
Wed Jul 25, 2018 7:33 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 85
Views: 13943

Re: UK Zip Build

Well I slept on it another night and decided there were too many things that I'd like to change about the stem and (in particular) breasthook to be able to accept additional bodges. So I performed a 'stemectomy' today: http://boatbuilders.glen-l.com/wp-content/gallery/inboard-zip-by-ian-spring-welwy...
by sproggy
Tue Jul 24, 2018 11:21 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 85
Views: 13943

Re: UK Zip Build

I can't quite picture what you mean by the stem being at least 10 degrees off.... Is it rotated so that the centerline is off? No, it's aligned correctly with the centreline. I mean by having the breasthook too high (with the boat upside down) it has rotated the stem by 10 degrees or so around its ...
by sproggy
Tue Jul 24, 2018 4:30 am
Forum: Small outboards
Topic: UK Zip Build
Replies: 85
Views: 13943

Re: UK Zip Build

Tom, Joshua, thanks for the suggestion. I suppose I have little to lose trying this - as long as I ensure that any cuts I make don't damage the frame itself I keep my options open to either re-use the stem or not. But the stem is at least 10 degrees away from where it should be which means the breas...

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