hi guys.
well ......deck had 2nd coat of resin , deck rails fixed, fore flag staff and stern flag staff fixed, torpedo racks fixed,
torpedo noses filled and sanded.
all ready for paint now then




regards
don

AWSOME!!!!!!!!!!

hi guys.
well I tried the motor in water today.
two motors I had were not good, so tried the last of the out-runner brush-less...........

I think a gear box is in order as this is a 4200rpm/v motor and got very hot along with the esc and battery after 5 mins of 'playing' in the bath as a 'direct drive' motor. the shaft started slipping in the joint towards the end. 
thinking either 2:1 or 3:1 gearing   . running a 40mm racing style prop.
regards
don

Sir,
You have not mentioned the weight of the boat. I assume 3.5 to 4 kg. max. Looking at the shape of the hull, I think 12,000 rpm (max.) on 3S Lipo (i.e 1000 KV) with a three blade thrust propeller (3.5 ~ 4 cm) will give a good result. At present 4200 KV with 40mm racing prop looks to high for this type of boat. Instead of gearbox arrangement you change the motor, as well as test it on a bigger surface to fine tune the rudder.

If that demo in the bathtub is anything to go by, Donnie me boy, you've built a monster!

hi mate.
I thought it may be too powerful a motor,
I have a RS380 SH Brushed motor..would that be any good? or one that looks like a 580 brushed.
the weight without battery is 1.98kg..quite light .....unless I find I have to put ballast in

Hi VC yes she is a bit big........just around 3ft

regards
don

By 'Monster' I was referring to the power / weight ratio and not the size of the craft.

hi VC,
yes the motor was overpowered and direct drive .......not enough torque for that,
got to sort out a gearbox from some where.cant find any marine boxes only aircraft reduction boxes.
going to try a 380 motor when the esc arrives.
I have decided to build one myself   
regards
don

hi guys.
well I thought I had the gearbox sorted.........
but the motor turns the wrong way so now I need to do it again with an 'idler' gear to revers rotation. 


so will have to find another set of bearing holders now .
and then mount an idler gear next to the shaft out put gear.
the motor will have an11 tooth pinion fitted.
regards
don

hi guys,
as an after thought this is a 'new' SR-380SH motor according to the 'specs' it is out put cw rotation.......... could I run it 'ccw' without any ill affects.......SPECS HERE.....
http://www.mabuchi-motor.co.jp/cgi-bin/catalog/e_catalog.cgi?CAT_ID=rs_380sh
regards
don

I have seen people using two brushed motors as contra rotating, even I have used similarly in Mistal boat. But in the case of aero models some say there is little variation in speed with ccw direction, so they prefer b/l motors. In this case don't think any ill effects with ccw rotation, may be slight various in rpm, but that doesn't matter.

hi mate.
I know with 'brush-less' it makes no difference,
but have never run brushed reverse for any length of time....this is good    
...no need to strip gear box and build in an 'idler gear'.    .
just waiting for an esc and receiver and some more paint now then.
well it may be a 9 or 10 tooth pinion on the motor ...see what I got, and is 22 teeth on the shaft drive, so thats just over half the torque to rotate the prop now.
regards
don

what lubricant is commonly used in stuffing tubes now..
I am just giving it a drop of light oil.it is bushed ends not bearings.
regards
don

I use automotive grease in the stuffing tubes. Not very particular about the grade.

Shreekant

hi guys,
any body that is thinking of doing this model .............
I have just found an exellant site where some one has researched the sister ship MAS 563.
There is incredible detail .engines fittings etc......too late for me now BUT.............
here.........
http://www.scalemodelworld.net/forums/viewtopic.php?t=5709&postdays=0&postorder=asc&start=0
regards
don

Thanks Don. That is an awesome find. Will need this some day, hopefully, soon.

hi mate.
glad some one found it handy..........brilliant site eh?


regards
don

Brilliant site for sure. That modeller is out of this world! Did you notice the rifles stacked on a rack in the below deck quarters? Now that is Master Craftsmanship!

HI MATE.
I think they are a molded rifle..... but he still went to the trouble of fitting out the hull...static model though....far too much detail for a working rc...............
but very nicely done.
regards
don

Hi guys,
well ....just an update pic.
now with depth charges and deck fittings........the deck fittings are too small a scale, I will have to make some

I have ordered a 35mm prop to try with the brushed motor now.
regards
don

hi guys.
well I have the 35mm prop now and the rx..did an indoor range check and it worked ok through 3 walls and a metal water filled heating radiator,it was about 30feet distance but defiantly not line of sight...so I think the rx will be ok. it is set on a bulkhead and stands up into the engine room roof space.
the lake I intend to go is limited as there are wild fowl there....and usualy you can only get to one end or the other for 'clear water'

so just waiting for the esc now and get some paint on.
regards
don

hi guys,
just an update.
I have changed the motor for the 'brushed 380' and reverse-able esc here are the latest 'bath' trials
not so much power but seems ok as direct drive, I will have to sort out some cooling for it :)I have a heat sink fitted but got just over 'warm'  I may put a small fan inside but need to look at intakes etc and maybe open the motor section into the next hull area for more circulation, I have small motors and GWR props from direct tail on a FP heli.      or I have a micro cp tail which is belt driven I could run that off the main motor with small blades.  




regards
don

hi guys,
well I eventually went for the small tail motor and a 2 inch prop for motor cooling running off a 3v nicd pack from a rc motor bike
with an intake in the deck behind the main cabin and opened an engine room deck hatch for escaping air


hatches for air


cooling fan
you can see the battery for the fan the other side of the bulkhead in this pic ...........blue..... a 3v pk made up of 4 x 1/2 size AAA battery
the motor heat sink 'just misses' the openings in motor by the brushes.

regards
don

Don Sir,

In the video - the performance is too convincing
and the desk finishing is excellent.

hi mate.
thanks for the comments............
yes I think the 380 motor will be fine.
sadly still waiting to get paint for the finish.


regards
don