Vic Smeed’s HMS Cossack MM500

[Ray Wood 3Participant @raywood3]

Hi John,

I'm not sure we actually need the extra depth these days with lighter gear, but will keep to the drawing. My HMS Diamond has no problem built lightly from balsa with ballast in the bilges, Cossack's going to be powered by twin 400's and 6 cell sub C nicad pack.

Regards Ray. (Diamond photos in my album)

[Colin BishopModerator @colinbishop34627]

Stability depends on two things. Firstly the intrinsic stability of the model in still water (e.g. the bath!) and secondly the ability to withstand wind resistance which is where a lot of models come a cropper.

Colin

[Eddie LancasterParticipant @eddielancaster]

Hi. All, there appears to be a lot of experience and information out there and being shared, I'm pleased to hear,

I will need all the help I can get with this one.

Eddie.

[Ray Wood 3Participant @raywood3]

Hi Eddie,

That was a good call regarding Inwoods Models, I pass there every week to visit my site in Holbeach, will be popping in there tomorrow for some wood 😀

Regards Ray

[John W EParticipant @johnwe]

hi ya Ray

when I built HMS Daring (World War 2 one) I seem to recall two NiCads of 7.2 volt – either side of the keel – amidships and a tiny bit lead in the bow seemed to be sufficient to ballast this model. This model was built at 1:72 scale, plank on frame from the Norman Ough plans – and it was a bit 'tender' on turning. No doubt if I had added a bit more lead, it may have cured its wobbliness (shall we say ) I never bothered – which reminds me as well – I am sure Norman Ough did a set of drawings for the same class as the Cossack – will do a bit of investigating

John

[Ray Wood 3Participant @raywood3]

Good evening Cossack's

Picked up some lumber from Inwoods today, it's a start anyway 😀

Regards Ray

[Eddie LancasterParticipant @eddielancaster]

Put a post on the other thread before I read this one, is there any balsa left for me at inwoods?

Eddie.

[Roger ClarkParticipant @rogerclark]

I went down town to get the plans enlarged today and found the last remaining copiers couldn't copy that size so the planning dept. is already slipping behind schedule! typical!

Roger

[Ray Wood 3Participant @raywood3]

Hi Roger,

Cut the drawing in half length wise and they will be able to print on 2 pieces of A1 size paper

Regards Ray

Edited By Ray Wood 2 on 10/07/2019 22:44:00

[Roger ClarkParticipant @rogerclark]

Um yes, they can only print A3! woopy doo we have real pros here

I'll have to search Hereford when I get a chance to get there.

Roger

[Ray Wood 3Participant @raywood3]

Hi All,

As Cossack will need a lucky ships mascot, here is Swowy on the bridge of HMS Diamond advising the skipper.

All my boats & barges will not put to sea without one 😀I

Regards Ray

[Ray Wood 3Participant @raywood3]

Good evening Cossack's

6 sheets of 1/2" x 3" x 36" balsa is just enough for the 48" hull with some slicing and Gorila glue the next stage is tracing the base shape and transfer to sheet and 5 minutes with my ancient Burgess band saw. I like this form of construction 😀

regards Ray

[Eddie LancasterParticipant @eddielancaster]

Hi.Ray, nice to see a start being made, I had a sheet of 1/8" balsa in the stores so I have the frames cut and sanded to size, i will be over to Huntingdon next week to get the rest of the materials then i can start the build whilst waiting for paint to dry on the dumb barges, keep us posted on your build please.

Regards.

Eddie.

[Ray Wood 3Participant @raywood3]

Hi Eddie

The Chantry mbc @ Bluewater had our open day today, hundreds of boats on display and busy on the water !

Returned home in time to see the Grand Prix , all good 😀

The 2 halves of the hull base here waiting for the glue to dry, I will be build this up with 1/8th sheet to make it 5/8tv's to suit the enlarged drawing.

Express Pullman passing 😁

Regards Ray

[Eddie LancasterParticipant @eddielancaster]

Hi Ray, Nice to see your build, I had thought of making the base 1/4" thick with two pairs of 1/2" thick side pieces and then extending the bottom of the frames by 1/2" to reach the bottom, this will enable me to put any ballast required low down on the inside of the hull, what do you think?

Will you be increasing the width of the frames to compensate for the extra thickness of planking, around 1/64"? or let the resin and glass fibre make up the difference?

Rgards.

Eddie.

[Ray Wood 3Participant @raywood3]

Hi Eddie,

That sounds feasible, I'm going for the full thickness make up so I can achieve the right underwater shape, as I can't bear flat bottom boats !! Even if they look ok in the water, I will finish the hull, I may use 3/16" planking to give me more scope for sanding the bow flare, and water test the hull wrapped in cling film with the waterline marked on and with motors/batteries roughly in place see how much ballast is required? then externally cut out the bottom plank and insert lead within it and glass the whole thing.

Regards Ray

[Eddie LancasterParticipant @eddielancaster]

Hi.Ray,thanks for that, I have already cut the hull sections from thick card ready to shape the hull, I will then make up a small section of the hull to see if I can get the full shape. I am still finishing the dumb barges so I am in no hurry.

Regards.

Eddie.

[Roger ClarkParticipant @rogerclark]

No hurry!!!! I'll tell you what no hurry is, I haven't even got the plans enlarged yet. You to will have your Cossacks in the water and sunk before I have laid the keel!

I have to clear some jobs out of the way and have a holiday before I make a start on this tub. I'm modifying my mini lathe with a stronger and larger crosslide so to take 6mm 'T' slots to improve it's versatility and also complete a quick change toolpost for my other lathe. Need to do these so that I can push forward with my steam engines, two of which will be for boats.

I've also got a big box trailer that is now surplus to requirements to finish tidying up ready for sale and to give me my drive back.

So watching with interest and planning my own slant on the build, probably involving extreme abuse to plasticard and other materials.

Roger

[Eddie LancasterParticipant @eddielancaster]

Hi. again, I have made a small section of the hull, from frame 1/2 to frame 1 and there appears to be enough wood to get the correct hull form.

This at No.1 frame

I might go to 5/16" for the bottom plank just to be sure.

Eddie.

[Eddie LancasterParticipant @eddielancaster]

Frames and hull profiles, the bottom of the frames are extended by 1/2".

36" planks of 1/2"and 5/16" balsa scarf joined to get the length required for the hull bottom section, back to the barges now until the glue has dried.

Eddie.

[Colin BishopModerator @colinbishop34627]

The problem with thick bottom planks is that it raises the internal ballast, whether weights or batteries. An alternative which I have previously used successfully on models of this type is to have a thin outer bottom plank and build up the forward and aft sections in appropriate thickness bread and butter laminations. For the middle bit where the hull is essentially parallelI, I have used square section balsa thick enough to accommodate the turn of the bilge with sheet balsa above. This gives a useful extra internal depth to the hull, essential for a destroyer model. Every little helps.

Colin

Edited By Colin Bishop on 16/07/2019 18:16:15

[Eddie LancasterParticipant @eddielancaster]

Hi. Colin, I have gone with your method of a thin'ish 5/16" bottom plank to finish at 1/4" thick then two layers of 1/2" to round the bilge, as per the plan,with the top up to deck level plank on frame as shown on the plans, the hull can then be finished, the internals fitted and then ballast fitted allowing an amount for the top works.

Regards.

Eddie.

[Ray Wood 3Participant @raywood3]

Hi Eddie,

I think I may have over done the ballast 😀 but at least it will be nice and flat !!

Regards Ray

[Colin BishopModerator @colinbishop34627]

Sorry Ashley, I deleted your post by mistake when removing Ray's duplicate!

Colin

[Ray Wood 3Participant @raywood3]

Hi Ashley

Are you going to join us happy balsa bashers and build a Cossack, go on you know you want to ? 😀I

Regards Ray

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