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Author Topic: Hamina Class Missile Boat 1:28 Scale  (Read 54205 times)

Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #125 on: January 07, 2010, 09:51:54 AM »

I have not managed to get a great deal over Christmas and New Year, it has been mostly work done on the remote control.

As I didn't want a clunky on/off switch I connected the enable pin of the regulator to the microcontroller and the key pad so that it can be switched off by the micro and on by holding down the middle keypad button, I've also started to add icons to the display for the menu.

As things like brightness, volume and other stuff I have not thought about yet need to be adjusted there needs to be a menu to do it.

I'm hoping to get more of the hull done this week/weekend and do a test fire of the gun on multiple targets.
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reefrich

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #126 on: January 07, 2010, 06:04:40 PM »

This is fantastic...you will have to incorporate this technology in a ship like the Hood!!!

Can't wait for the next installment.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #127 on: January 07, 2010, 06:55:10 PM »

I am happy to share the knowledge.

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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #128 on: January 08, 2010, 09:12:13 PM »

Here is a video of the first multi position test fire.

http://www.youtube.com/watch?v=ynbmfJPnOLU
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #129 on: January 09, 2010, 01:48:39 PM »

I've decided to get a bit more hull work done this weekend.

As Graupner weren't very forthcoming with design files for their jet drive units I've started to model them, as this build is 'glue free' I need to make sure that everything fits together with machine screws perfectly, I expect another 2 hours and I'll have the whole thing modelled and ready to float in to the virtual hull.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #130 on: January 10, 2010, 12:11:58 PM »

I don't know if anyone else lost thier sky due to snowy dishes, I had to fill a bucket with hot water and use the jetwash to melt it off. Extreme conditions require extreme measures!

In and around all the sledging I've managed to model the rear nozzle, I had overlooked the 5 degree down andgle of the prop and shaft which I have also sorted.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #131 on: January 10, 2010, 12:13:27 PM »

Just the bucket left to do, it shouldn't be too hard as its all easy to measure with the caliper. I should have it done at some point after lunch.. Hopefully.
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reefrich

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #132 on: January 10, 2010, 04:09:47 PM »

What software are you using for the CAD work?
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #133 on: January 10, 2010, 05:51:48 PM »

Hi reefrich,

It's Solidworks
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #134 on: January 10, 2010, 10:51:34 PM »

I've just finished the Igloo, more pictures tomorrow when the light is better... Oh yeah and that drive thingy
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #135 on: January 11, 2010, 10:46:38 AM »

I've just floated the drives in to the hull, I still need to hollow out the rest of the bulkheads which I'll do next.

Both drives are now 1.5 degrees rotated inwards at the top, I'm not sure exactly how this will effect the handling. It does seem like it will help rotate the boat when going in to a turn which I think will be a good thing.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #136 on: January 11, 2010, 12:23:33 PM »

Unfortunately I've left the Hacker A50 at work and as there is still quite a bit of snow blocking my car I'm not going to be able to design the motor mounts, I will however have a go at the couples.

I've seen on something in the past a coupling which uses two steel parts (Motor and Drive) which were connected by a flat spiral like disk, it didn't give the flexibility of a universal joint but I expect to have the motor pretty well in line so I'm only looking to reduce the noise and compensate for any small tolerances.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #137 on: January 11, 2010, 02:52:17 PM »

I'm pretty confident about the coupling design, it will use 0.5mm copper. I think I have some laying about the workshop, it's pretty easy to CNC cut.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #138 on: January 11, 2010, 02:55:34 PM »

Now I just need a motor or two.
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steve pickstock

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #139 on: January 11, 2010, 03:57:13 PM »

A pair of big grunty muthas - to shove that beast across the water. YEAH!


Ooops sorry, did I type that?
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andyn

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #140 on: January 11, 2010, 03:58:46 PM »

Those types of coupling are horrendous, they used to be used for IC.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #141 on: January 11, 2010, 04:00:21 PM »

I've left plenty of space for alternative methods, I wanted to avoid stuff like rubber
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #142 on: January 11, 2010, 04:03:41 PM »

There isn't going to be movement like an IC so hopefully they should be OK, I guess I'll find out after some testing. What other methods do you know of that I might be able to use or improve on?
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Martin [Admin]

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #143 on: January 11, 2010, 04:20:46 PM »

I don't like that type of coupling either, they are prone to imbalance, wear, noise and loosening up.

Have a look here for a few more designs:  http://www.huco.com/products.asp?cat=46

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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #144 on: January 11, 2010, 04:23:41 PM »

These are great, thanks. I expect a of these are cheaper that machining 6 custom parts.
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andyn

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #145 on: January 11, 2010, 04:35:16 PM »

The best coupling I've seen uses a round piece of rubber encased within the two halves of the coupling. I think they were made by Kalistratove. I don't think you'd be able to buy one anymore but they look like this:

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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #146 on: January 11, 2010, 04:44:57 PM »

I expect a cross in place of channel would allow movement in all directions, it could be encased in rubber like those.
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Harrison

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #147 on: January 12, 2010, 08:15:28 AM »

I would have liked to purchase 2 couplings from Huco but they don't seem to do a 7mm coupling, as this is the diameter of my shaft I would like it to be a snug fit with set screw on the shaft flat.

Perhaps one solid piece and a few minutes on the band saw?
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HS93 (RIP)

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #148 on: January 12, 2010, 08:23:29 AM »

how about some of these they can be bored out easy.

http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Oldham-Couplings

Peter
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HS93 (RIP)

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Re: Hamina Class Missile Boat 1:28 Scale
« Reply #149 on: January 12, 2010, 08:30:59 AM »

these is also these metal ones from

http://www.prop-shop.co.uk/index.php?id=26&section=store&sub_section=products&product_type=26

what are you using for props in your jet units ?

Peter
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