Shetland 640 advice

Thoughts, Ideas and General Questions
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bpmurray
Posts: 4
Joined: Mon Dec 02, 2019 1:40 pm

Shetland 640 advice

Post by bpmurray »

I've just joined so please excuse me if this is the wrong forum!

A couple of friends and I are bringing a neglected 640 back to life. It was in a pretty bad condition initially, but we've brought it back to the glass and are rebuilding it from there. One question that we are very unclear about is the engine. We want to use an outboard but we're seeing conflicting information. The boat will be used at sea, not in lakes or rivers, so the engine does need to do more work. Because of distances, we also need it to be reasonably quick, not boy-racer stuff, but being able to travel from mooring to the fish in a reasonable time - basically, she should get up on the plane and skim along to where we're going.

According to the manufacturer's information I was able to find, it seems that they don't recommend anything above 45HP. However, I suspect that to get up on the plane will require something like 12-15 knots, and (I'm guessing here) that probably means upwards of 70HP.

So my question here is: what is the max outboard size we can fit on a Shetland 640?

I would look at the photos on the forums to see what they have but all I get is "You do not have the required permissions to view the files attached to this post." - that may be the subject of a further question unless there's a quick simple answer (it's not in the board FAQ).

vreagh
Posts: 192
Joined: Sat Aug 02, 2014 6:46 pm
Location: Cornwall

Re: Shetland 640 advice

Post by vreagh »

Welcome to the club. You'll find good tips and advice from the members. To gain access to pictures and data you need to be a full member, costs £5 for life membership.

PaulyB
Posts: 2
Joined: Wed Sep 11, 2019 12:50 pm

Re: Shetland 640 advice

Post by PaulyB »

In the 1974 brochure Shetland stated 35hp as maximum, the 1977 brochure stated 75hp and the weight of the boat had increased from 975kg to 1197kg so they must have 'beefed' it up a bit. In 1977 you could also have an OMC 120hp inboard,.... so it depends on the year of manufacture of your boat.
Is it definately a 640 as the 644 looks the same from above the waterline but had a keel. It also had a different layout in the cabin.... a dinette making it 4 birth. This is according to a 1979 brochure.
I hope that is of some help.

bpmurray
Posts: 4
Joined: Mon Dec 02, 2019 1:40 pm

Re: Shetland 640 advice

Post by bpmurray »

Thank you for the replies - I've paid the fiver. I think the site should make it clear that it's needed since we didn't notice anything that indicated it was. Of course that may well be me! 😁

I'm in the process of determining her age and verifying if she's a 640 or 644. Hopefully I'll know for sure tomorrow.i'n really grateful for the info.

bpmurray
Posts: 4
Joined: Mon Dec 02, 2019 1:40 pm

Re: Shetland 640 advice

Post by bpmurray »

Just got some money re info: it apparently has a badge saying "Shetland 640 number 113". Any idea which version that might be?

bpmurray
Posts: 4
Joined: Mon Dec 02, 2019 1:40 pm

Re: Shetland 640 advice

Post by bpmurray »

Sorry about the typos above - the dangers of using a mobile phone!

The badge on the boat is below - any idea which version that is?
IMG-20191211-WA0010.jpg
You do not have the required permissions to view the files attached to this post.

PaulyB
Posts: 2
Joined: Wed Sep 11, 2019 12:50 pm

Re: Shetland 640 advice

Post by PaulyB »

Your boat seems to be 1975 by the number... so more than likely up to 35hp.

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