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Author Topic: Mas Boat 1/24 Scale.  (Read 14966 times)

gra2

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Mas Boat 1/24 Scale.
« on: February 27, 2014, 05:59:28 AM »

Hi all,
Some photos of my Mas Boat build hull from Christian (cdsc123).


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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #1 on: February 27, 2014, 06:06:09 AM »

More photos I hope.


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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #2 on: February 27, 2014, 06:07:51 AM »

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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #3 on: February 27, 2014, 06:09:14 AM »

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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #4 on: February 27, 2014, 06:12:45 AM »

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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #5 on: February 27, 2014, 06:14:11 AM »

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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #6 on: February 27, 2014, 06:17:00 AM »

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longshanks

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Re: Mas Boat 1/24 Scale.
« Reply #7 on: February 27, 2014, 08:16:38 AM »

Hi Gra2,

That is looking absolutely cracking !!

I'm building the Italeri MAS as a static model

http://www.britmodeller.com/forums/index.php?/topic/234943576-another-mas-boat/

So can fully appreciate what you have achieved, particularly with the wheelhouse and torpedo launch cradle.

I've seen Christians hulls advertised  may I ask what the quality is like and is that a built in flange on the top of the hull?

Cheers longshanks
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #8 on: February 28, 2014, 05:23:41 AM »

Hi Longshanks thanks for comment.
Hull is not to bad will come up okay flange is part of my framework that I installed.
Like your build on Britmodeller.

Gra2
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #9 on: March 04, 2014, 05:57:08 AM »

Hi all,
Second torpedo finished.


Gra2
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #10 on: March 04, 2014, 05:59:41 AM »

Trial steering setup blocks look bigger than they are.


Gra2
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #11 on: March 04, 2014, 06:01:41 AM »

Stern end.


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longshanks

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Re: Mas Boat 1/24 Scale.
« Reply #12 on: March 04, 2014, 07:05:13 AM »

Looking good !
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #13 on: March 05, 2014, 09:20:36 AM »

Hi
Need to make Breda 20mm Cannon can anybody point me in direction of a drawing please.

Thanks Gra2
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #15 on: March 05, 2014, 11:37:00 AM »

Hi Christian,
Thanks for drawing info I hope you like what I am doing to your hull.

Gra2
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cdsc123

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Re: Mas Boat 1/24 Scale.
« Reply #16 on: March 05, 2014, 11:48:28 AM »

I am frankly in awe. Please continue, more pics!
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pompebled

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Re: Mas Boat 1/24 Scale.
« Reply #17 on: March 06, 2014, 10:22:50 PM »

Hi GRA,

Your build looks awesome!
Which plans are you building from?

As I'm terrible with empiric scales, how long is your hull (in inches, or cm)?

I'm working on a 110 cm version and I'm currently a bit stuck on how to realize a large enough hatch without compromising the looks...
http://www.modelboatmayhem.co.uk/forum/index.php/topic,34033.msg336713.html#msg336713
I've got the bare hull running, check out the video in my build thread.(Turn up the sound really high.)

As you can see I've gone the same route regarding the steering, and it works a treat, as long as the tiller arm on the rudder and the arm on the servo are the same length.
You'll need this amount of rudderthrow.

The way you have it in your pictures will result in slack in the lines, hopefully not too bad as it'll make steering at speed quite hazardous...

I've changed from two props to one bigger prop, one reason being the higher efficiency (which isn't really an item with the brushless power available), the other is the hull design.

I've build a smaller prototype and discovered the steps work really well, drawing air under the hull, the point where this happens causes a jolt in the speed; without more throttle the boat accelerates due to the lower drag.
Downside to this phenomenon is the fact the air/water mixture affects the prop and rudder efficiency; as you can read in my thread, small props loose grip above a certain speed and the revs go up, while the speed goes down, until the steps have lost their function and the hull runs fully in the water again.

The prototype rudder was to scale and when I increased the propsize to keep part of the blades in undisturbed water, the speed increased too and the steps drew massive amounts of air under the hull, rendering the small rudderblade useless and the boat uncontrollable until speed was reduced.

The larger 110 cm boat got an enlarged rudderblade and the prop was positioned further forward to eliminate as much 'foaming' as possible, also, as the prop is in line with the rudder, the distance between prop and rudder made the steering less aggressive.

I fear your props (the brass props look good but are not suited) will prove to be too small to keep the boat on the plane; as soon as the steps do their job, the props will stand in the air water mixture...

Regards, Jan.

 
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #18 on: March 07, 2014, 05:52:47 AM »

Hi Jan,
Thanks for comment on my build I have viewed your build log before on this forum.
The plan I have is a Dave Metcalf plan from Model Boat Magazine June 1995 but it appears to be the same as your plan but I am looking at lots of photos and various builds of the Italeri 1/35 scale Mas Boat Kit to help with mine.
Length of my boat is 31" approx.
I did trial my boat before attaching deck and it went okay with my prop setup but steering was not to good.
I intend to increase rudder size when I finish build.
I take your point about tiller arm and servo arm.

Gra2   
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pompebled

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Re: Mas Boat 1/24 Scale.
« Reply #19 on: March 07, 2014, 11:18:13 AM »

Hi Gra2,

Good to hear you didn't have the running issues I had with my 75 cm prototype and the 110 cm version, I guess there must be a slight difference in the hull shape.
Either that, or you didn't run faster than 20 km/h, at which speed the steps don't work as much air under the hull as they do when you go faster.

What motors on which Voltage are you running, if I may ask?

Another question if I may; as my plans are rather simple, I'm not sure how much the deck curve is, I'm presuming 5-6 mm higher than the sides, but that's a guess...

Regards, Jan.
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #20 on: March 11, 2014, 06:06:03 AM »

Hi Jan,
My motors are Turnigy 3648-850 kv powered by one 3s 4600ma Lipo.
I may change to a higher kva when boat is finished.

Camber on deck I would not go below 6mm for your larger hull if you look at photos you may feel you need more.
Hope this helps.

Regards,Gra2
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pompebled

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Re: Mas Boat 1/24 Scale.
« Reply #21 on: March 11, 2014, 04:54:16 PM »

Hi Gra2,

Good lord, you have even more power installed than I have in my MAS (1200W max).

Granted, depending on propsize you'll most likely never draw the full 1800W, but still...
With the right props you should be able to use those 8500 rpm under load to make the boat run at least as fast as my MAS.

I assume it's a typo when you say you want to install even more power (as KVA=Watt) and you mean a higher KV (rpm/Volt) to be able to run (even) faster?

Thanks for the indication of the camber of the deck, I'll take it into account when I make the beams.

Regards, Jan.
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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #22 on: March 27, 2014, 12:01:13 PM »

Hi a bit more work on the Mas and trial fit of torpedoes.



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gra2

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Re: Mas Boat 1/24 Scale.
« Reply #23 on: March 27, 2014, 12:04:13 PM »

One more.



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mark w

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Re: Mas Boat 1/24 Scale.
« Reply #24 on: March 27, 2014, 03:42:10 PM »

Gra2,
 
Looks great  :-)) . Very interesting subject you don't see very often. Keep up the good work.
 
Mark
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