Vosper rttl

[Ray Wood 3Participant @raywood3]

Hi Micheal,

Here is a mock up of your rttl over the drawing with a 4mm shaft 6mm OD 10" stern tube with an X35 prop, Huco coupling and 600 brushed motor. The rudder is the traced shape of the Perkins medium size. The bracket shown on the drawing is of the full-size boats shaft support, which you don't need but a little fillet between the keel and the tube will give it support.

Regards Ray

Sorry the photo's vertical my tablet had a funny turn 😀

Edited By Ray Wood 2 on 16/01/2020 20:04:14

[Michael Cole 8Participant @michaelcole8]

Hi Ray,

Thank you for the information. I would like to fit 2 props and 2 Rudders would I be right to duplicate the assembly you have shown.

Kind regards

Michael

[Ray Wood 3Participant @raywood3]

Hi Micheal,

That option will be twice as good you may want to double the ply skin with a patch where the tubes go through the bottom of the hull, here's the same set-up on my Huntsman 31, which is 34" long. you could go brushless but I think it would make Mach 2 easily

Regards Ray

[John W EParticipant @johnwe]

Hi ya Michael

it is good practice to reinforce where the prop tubes go through the skin of the hull. I have put a photograph on of how I did this on the RTTL which I myself built.

just out of curiosity, is it not worth sticking to one prop shaft through the keel – this would make life a lot easier for you as you will only have one motor and coupling to line up – whereas if you have 2 prop shafts and motors – you then have to ensure that both prop shafts line up on the outside of the hull of equal distance from the hull skin – and – also that the 2 prop shafts are parallel to the keel. Just food for thought before diving in

Also, if you require the correct shaped rudder as is on the plan – one of the ways I have done it in the past is purchase a rudder from 'off the shelf model shop' and cut it and file it to the shape required.

If I can, I will try and put a link on of when I ran my RTTL on the local lake last summer.

John

Edited By John W E on 17/01/2020 18:25:29

[Michael Cole 8Participant @michaelcole8]

Hi Ray and John,

Thank you for the information and photos.

The drawing I am working to requires the stern to have additional 3/4 X1/8 inch strips running through two compartments for twin Rudders. I think stern tubes will pass through these as there is mention of using twin props as an alternative to a single prop.

The thickness becomes 3/16 inch in old money.

Kind regards

Michael.

[Michael Cole 8Participant @michaelcole8]

Hi,

Correction to the above the 3/4 inch should read 1/2 X 1/8 inch running from bulkhead B4 through to B6 on the drawing.

The overall thickness is still 3/16 inch.

Michael.

[Michael Cole 8Participant @michaelcole8]

Hi Ray,

Your drawing looks different to mine, I think mine is older as the layout is slightly different.

Kind regards

Michael.

Edited By Michael Cole 7 on 19/01/2020 17:32:09

[Michael Cole 8Participant @michaelcole8]

Hi or Help,

Is there any difference between tissue paper and modelling tissue?

My rttl calls for heavy weight tissue or silk to be applied to the hull.

What is the opinion of the community with regard to the use of the above please?

Kind regards

Michael.

[Michael Cole 8Participant @michaelcole8]

I should add that I have given the hull two coats of shellac sanding sealer.

Thanks

Michael.

[ashley needhamParticipant @ashleyneedham69188]

Michael. There is no single opinion regards hull finishing. There are loads of different methods, and to be honest all of them are valid.

As you have used sanding sealer (which can crack over time) then the easiest method might be tissue paper (heavyweight present wrapping tissue) and dope, or EzeKote. Better still, glass tissue or cloth. You can get really fine glass cloth, like silk. EzeKote is easy to use as water based, or some favour resin of some sort…Z-poxy is a favourite.

there is a forum post on hull finishing, and DM has written a very good expose on the subject. Look on right hand side column, scroll down to….Article database….hints and tips…wooden hull finishing.

Ashley

Edited By ashley needham on 21/01/2020 15:25:13

Edited By ashley needham on 21/01/2020 15:27:36

[Ray Wood 3Participant @raywood3]

Hi Micheal,

Heavy weight tissue is much more robust, I use wallpaper paste which can be brushed through the heavy weight tissue to keep it in place, and once dry a couple of coats of shrinking dope, then primer.

Having said that your plywood hull and hardwood bow blocks don't actually need the extra strength of glass cloth and epoxy resin, granted it doesn't add that much weight. I have 40 year old ply boats just painted and they are fine

Balsa and liteply is another thing and do benefit from glass cloth and resin to make them ding proof.

Regards Ray

[Michael Cole 8Participant @michaelcole8]

Hi both,

Thank you for your prompt reply, I appreciate your guidance.

Kind regards

Michael.

[Michael Cole 8Participant @michaelcole8]

Hi,

Can someone tell me what width to allow for the deck planking on the rttl please.

I was thinking of 5 mm.

Kind regards

Michael.

[Dave Cooper 6Participant @davecooper6]

Hi Michael

I think mine varies at about 2-3mm depending on whether it's on a 'straight run' or a 'tapered' bit. That's at 1/48 scale (ish).

Are you at 1/2" to 1 foot (1/24) ? If so, I should think 5-7mm will look about right.

Dave

[Michael Cole 8Participant @michaelcole8]

Hi Dave,

Yes you are right 1/2 to 1 foot.

Thank you very much.

Kind regards

Michael.

[Michael Cole 8Participant @michaelcole8]

Hi,

Gunwales call for 3 X 1.5 mm ply could someone suggest an alternative please also should these be glued in place before applying tissue or can they be added after tissue.

Thank you

Michael.

[Ray Wood 3Participant @raywood3]

Hi Micheal,

I find obeche very good for gunwales and spray rails as it bends easily and takes temporary pins if your careful, I would put them on before the tissue covering.

Regards Ray

Edited By Ray Wood 2 on 24/01/2020 16:24:40

[Michael Cole 8Participant @michaelcole8]

Hi Ray,

Looks like the horse has bolted, I have tissue covered the hull.

Will the obeche adhere to tissue. I am using cascamite resin wood glue.

Kind regards

Michael.

[Ray Wood 3Participant @raywood3]

Hi Micheal,

Oooops ! Poundland superglue works well and will do the job 😀 I use loads of it ! Keep well ventilated.

Regards Ray

[Michael Cole 8Participant @michaelcole8]

Hi Ray,

Thank you for your prompt reply and advice.

I have just ordered a pack of obeche, super glue next.

Kind regards

Michael.

[Colin BishopModerator @colinbishop34627]

Perrsonally I would prefer to use epoxy glue.

Colin

[Dave Cooper 6Participant @davecooper6]

At this time of year I find my 2-pack gets rather 'gloopy' – have to warm it up on the workshop heater first.

It must be getting old (just like the boat builder !)…

[Michael Cole 8Participant @michaelcole8]

Hi all,

Just an update on my build, Obeche received and super glue used. Bit of a messy business. Photo to follow.

Michael.

[Ray Wood 3Participant @raywood3]

Hi Micheal,

Looks good in the photo, the trick is to pin the obeche in place and just run the superglue in with a capillary tube just where you need it. But I have been practicing 😀

Regards Ray

[John W EParticipant @johnwe]

HELP – I know I have lost part of me sight but I cannot see any photographs I am so sorry – I would really like to see this built though and have you managed to put 2 motors and 2 shafts in?

john

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