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[MCAT]

Having a go at building HMS Hood  at 350 scale. I need info and a picture if poss on how to connect two of the four props
to one small motor . the other props will be free spinning . only going to sail on the calmest of days so that should be enough.

any other tips if you have built one would be most appreciated .

Mick

[andrewh]

Mick,

Two props, two small motors might be the simplest - the little flat 1.5 to 3v hobby motors would do the job. 
Proops have some very nice mabuchi 180s 13mm dia, long flat case which would be even better.  Insulation from silicone wire as the coupler

My son's Yamato still has the 1 into 4 gearbox installed, but its EVIL and noisy so I have 4 of the 180s lined up for a retrofit  - they fit very low shaft lines, so are good for 1/350 ships and smaller

If you need to go single motor I would suggest pulleys  and a rubber band or o ring to transfer the drive.  I make up my own pulleys from plasticard sides and a balsa or liteply core all cut out with a circle cutter and trued up with sandpaper on a mini-drill.

Good building
please keep us in the picture, with a picture

andrew

[hiapita]

hiya hope you have fun building i hope we have some pics soon 

hannah

[MCAT]

Andrew  thanks for the tips. off to search the Web for the bits you mention

Mick

[Eric65]

Hi MCAT, which model is it your modifying?

I have the Trumpeter 1/350 Hood, still boxed, and would be interested in making her R/C capable, but it is such a narrow hull that it must present some headaches to overcome!

[MCAT]

HELLO Eric 65   yes its the same kit I have . never done it myself so looking for help were ever I can find it

have ordered a couple of small motors from maplins. have stuck the two hull sections together  and see how the motors fit and go from there not spending to much on electrics have most bits already if there any good, we used to have a family who came to black park lake who motorized small kits and did a fantastic job,  were are you i need you guys.

if I get ant tips I wll add them to this thread maybe you could do the same.

Mick

[andrewh]

Mick,

I see you are in Middlesex - there will be droves of Mayhemmers in your vicinity!

The little Maplin motors may well need to be supressed to minimise radio interference - do you know all about this?  I assume its a YG15P (small motor)
Does your kit have moulded-in "troughs" for the propshafts?  if it does you can ignore them (apart from the location of the propshafts ) I would suggest adding a prop shaft (ideally stainless steel) running in a brass tube (ideally with brass or plastic bearings).  Have you got some kit propellors, or some more little ones around 20 to 25 mm dia max?

rgds, andrew

 

[MCAT]

Hi Andrew yep live near Heathrow . the motors i have ordered are YG13  smallest i could see in the catalogue

have taken note on the propshaft materials and will do exactly what you suggest, as for the propellers only those that came with the
kit which of course i will disregard. also have some in a upgrade kit comes with the gun barrels not opened the packet yet but don't look like they are good enough so again will take note of your suggestions, thank you for the info . should you think of anythink
else have have time to post it would be most appreciated.

Mick

[Eric65]

Thanks MCAT, much appreciated.

I've also bought the WEM brass etched set for her, it is amazingly detailed, and looks like a bit of a nightmare to fit!

[MCAT]

YEP  I have  4 or 5 sheets of brass etched fittings  maybe to small for my shaky old hands but will give it a try

I having a go at this kit because I cannot get a sensible size kit for rc .

[Eric65]

If you are going to fit one motor to two props, how well will she steer?
Will you fit an oversized rudder?

I am building the Bismarck just now and am fitting her with two motors and two ESC's so she should have a good turning circle, I hope!



Of course, being 1/200 I have much more room to play with!

[Martin (Admin)]

To aid with steering, you could use independent control for each motor and she'll turn on the spot!  :)

[rem2007]

Hmmm, that kitchen table looks familiar  

[Eric65]

 :)  I thought it might.... ::)

[MCAT]

Eric  I thought about using an oversize rudder as not much room in there.  plus my clumsy fingers.  will have a look around
don't think I will go overboard with kit, with a model of this size sailing will be limited by weather and amount of other boats on the water, just a bit of fun between sailing other models

[andrewh]

Bother - lost the first post.  'ere we go again

Our Yamato with 4 screws and slightly enlarged rudder steers well enough to be safe and seaworthy, if not to do a steering comp.

She is about 1/3rd filled with shaped blue foam blocks; since I remember well my airfix  "ood from the late 1950s which would have performed well as a dynamic diving sub. 
It was that experience that taught me that low voltage electrickery and water are able to do a limited amount of mixing.  The KaKo motor on 4.5 V would run continuously under water, so the ship bumped along the river bed quite fast unless the pointy end got stuck in something.
Pics of Yamato innards available if it would in any way help
Little props - I am using the ones from the Yam kit, my old Hood used a bent and soldered tin sheet/brass tube prop.  The people who supply equipment for "plastic magic" conversions do some sweet little brass props just right for this kind of application. 
Sorry I havn't got any names in mind at the moment
andrew

[MCAT]

Andrew   Would much appreciate a couple of pic's of the inside layout.

and the tips are all noted . Many thanks

Mick

[Eric65]

It would be great to see a build diary of sorts MCAT, hope it all goes well!

[andrewh]

Mick

Finally got me and camera (and Batteries) and Yamato all in the same place

Couple of pics attached - the location of the buggy pack can be seen - it nestles in the foam block that fills the bow

Rudder servo is a small old Futaba - ANY servo would do, however small - the rudder is about 30% bigger that scale and the same shape, so it is quite well balanced

There is a thread going on powering boats with servo drives - it might be helpful to you to on the subject of small props

andrew 

[MCAT]

Andrew   many thanks for the pic's  more glues on how to set it up.  what scale is yours , the Hood is 1/350

Toying with the idea of a mixer unit from Action to control the two outside props  and not use the rudder to steer  ???

[andrewh]

Mick

Have a rudder anyway - you can always apply the mixer as well

Yamato is also 1/350, but a slightly larger ship!

The kit we got was designed for motorised running, and the whole bach half of the deck comes off - retained by two snap catches

In practice we only run it in calm conditions.
andrew

[maninthestreet]

What make is the Kit - Tamiya?

[MCAT]

The Hood is made by Trumpeter.  nice kit but may be a struggle for my fat fingers , at this point I'm making up my mined
what to remove from it and what bits of the upgrades to use so many differant opinions when you read the reports this will take a while . any clues out there how to fix the main superstructure decking for easy access .


Mick

[maninthestreet]

Who makes the Yamato?

[Eric65]

You might want to use magnets to secure the supestrucure Mick, that is what I am using on my Bismarck. Small frigde magnets, not very strong, but strong enough to hold the deck in place.