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BRUTUS MK 11

Axe Head ship of the future

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Bob Abell06/06/2020 17:42:02
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8899 forum posts
2781 photos

Tracing the keel onto the plywood is a bit tricky

The keel is shown in two pieces and on different sheets

The solution is to refer to the drawing border, to line up the two pieces

See photo....I`ve cut the border off the LH sheet

ie.... The drawing borders need to be parallel

Bob

joint info.jpg

Paul T06/06/2020 18:41:30
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7140 forum posts
1204 photos
2 articles

Captain Bob

Putting the rudder in a forward location does have some design merit as it can help with manoeuvrability however the downside is that rudders are most effective when positioned behind the propellers.

Paul

Ray Wood 206/06/2020 19:07:49
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1979 forum posts
705 photos

Hi All,

A rudder anywhere near the sharp end will act as a brake, the flatter hull at the stern is much easier for a rudder to push sideways ??

Regards Ray

Bob Abell07/06/2020 08:32:53
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8899 forum posts
2781 photos

Here's an interesting thought, chaps

Imagine one rudder between twin props, with the rudder blade being extra long, so that a single prop could act on the blade

What would be the effect?

One prop would steer the craft and the other prop would drive the craft forward

Just a thought

Bob

Ray Wood 207/06/2020 09:02:32
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1979 forum posts
705 photos

Hi Bob,

How about the other way round ? 1 prop & 2 rudders 😎

My new toy, I just sit looking at it !! Scary or what 😯

Regards Rayimg_20200607_085623.jpg

Bob Abell07/06/2020 09:59:16
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8899 forum posts
2781 photos

Hi Ray...…...You`ve taken the plunge into the inknown there, old chap!

It will still work, but with reservations

Have you tried it out yet?

It is the reverse of what I hinted about, especially should the rudders have extensions on the inside to be more effective with the prop

Keep us informed

Bob

Bob Abell07/06/2020 10:06:59
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8899 forum posts
2781 photos

What I was saying about the borders being parallel, hasn`t worked out?

See below...…..

The two pieces are easy to match up anyway...….No harm done

Bob

keel 2.jpg

keel 1.jpg

Bob Abell07/06/2020 11:16:57
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8899 forum posts
2781 photos

Having no suitable plywood, the keel is being made up from, two outer layers of 1/8 " hardboard and one central core of 1/8" plywood off cuts.....ie a composite material...….Very stiff and strong...….Hopefully

This is what makes the build at the moment more interesting...…..Scratching about for suitable materials!

Bob

keel 3.jpg

Chris Fellows07/06/2020 13:10:51
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695 forum posts
405 photos

Ashley will be happy at the use of hardboard! smiley

Chris

Edited By Chris Fellows on 07/06/2020 13:11:17

Bob Abell07/06/2020 13:14:33
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8899 forum posts
2781 photos

Thanks Chris

Hardboard can be a life saver at times.....Especially....This time!

Bob

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