torpedo system

[Slats]

Yes it will be and you can bet that it will be a masterpiece what David turns out.I'll drink to THAT!

The only other question I have for David and Mike relates to price and quantity of warshots - which I am sure won't be too far away. Its worth the wait guys and I hope by years end to have two new boats running this system.

In the meantime its build build build - I'd like to be a position that Rankin (my Collins is completely built (minus the SD set up) and ready for new SD and Torpedo kit.

J:)

[deepseadiver]

Boys can you do me a favour - drop the panty talk (noise) and get back on topic (signal).

Thanks
JohnI'll drink to THAT!

Ok back to torpedo talking , with plenty of gas ill drink to that. I'll drink to THAT! Jim

[Slats]

On the subject of colour - I plan on airbrushing the heads flourescent orange. I have seen some Mk48's on Rankin that have an orange flourescent forward bit and then a green main body. This colour will be easier to find, and an obvious point to finding them easy is to fire them towards the shoreline.

J

[Slats]

Test shot from Collins Class Farncomb of mk48...

http://en.wikipedia.org/wiki/File:Mark_48_Torpedo_testing.jpg

And the reference I made to an orange band -is for test shots (no warhead).
Apparently all mk48s that have a business end are like the one shown here are mainly green. The cap at the front gets removed before firing.
This one is being loaded into Rankin....from the defence.gov.au website



Okay David how about that long list of questions I posted- I'll shut the proverbial up if its too soon.

Best
John

[He Who Shall Not Be Named]

Test shot from Collins Class Farncomb of mk48...

http://en.wikipedia.org/wiki/File:Mark_48_Torpedo_testing.jpg

And the reference I made to an orange band -is for test shots (no warhead).
Apparently all mk48s that have a business end are like the one shown here are mainly green. The cap at the front gets removed before firing.
This one is being loaded into Rankin....from the defence.gov.au website



Okay David how about that long list of questions I posted- I'll shut the proverbial up if its too soon.

Best
John

The previously mentioned 'international orange' nose of that MK48 denoted it as an exercise shot. The gray nose seen in the above picture is a conformal protective 'condom' used to protect the sonar transducer window, and is removed before tube loading the weapon. The yellow band indicates that this unit is configured as a war-shot.

I want to give those carefully crafted torpedo/launcher questions (you pain in the ass, you!) proper answers; I'll address them this afternoon, John. Good stuff, deserved of consideration.

David,

[deepseadiver]

John,
That ship broke in two wow those torpedo have a serious punch that was a think ship and it split it in half like a toy :eek: how much explosives are in one . if i was on board and saw that coming at me praying won't help that's for sure im dead..

http://en.wikipedia.org/wiki/File:Mark_48_Torpedo_testing.jpg

[Slats]

John,
That ship broke in two wow those torpedo have a serious punch that was a think ship and it split it in half like a toy :eek: how much explosives are in one . if i was on board and saw that coming at me praying won't help that's for sure im dead..

http://en.wikipedia.org/wiki/File:Ma...do_testing.jpg

Remember its not contacting the ship, the damage is done by proximity under the hull and by two forces - expanding pressure wave ahead of expanding explosive pressure bubble. This breaks the targets back by updraft initially and then as the upward forces collapses the hull is then back snapped downward.

That damage was done with a Mk48 Mod7. We are in the process of getting an upgrade now for the RAN to some version of the ADCAP.

J

[deepseadiver]

Remember its not contacting the ship, the damage is done by proximity under the hull and by two forces - expanding pressure wave ahead of expanding explosive pressure bubble. This breaks the targets back by updraft initially and then as the upward forces collapses the hull is then back snapped downward.

That damage was done with a Mk48 Mod7. We are in the process of getting an upgrade now for the RAN to some version of the ADCAP.

J

Thanks John,
just explaining that to me is incredible it makes a lot of since using pressure forces. If i am correct creating like you said a huge bubble, underneath the ship, in the middle putting presure lifts the ship up plus having a bubble underneath the keel ,theres is no sapport so the weight of the ship cracks itself in two. What's amazing is taking a huge ship of war and just breaking her back like it was a pretzel, astonishing .

Jim

[toppack]

I found that by removing the insulation-sleeve from AAA rechargable batteries, they fit perfectly inside a 7/16"OD brass tube, so that will be my power-source for my torpedos. :)
I'll only need 1 battery per torpedo so the sleeve removed is no problem, I can use the torpedo's tube as the negative conductor.

[Subculture]

Will that give you enough poke? Most motors need 3 volts at least to produce reasonable power and torque.

[toppack]

Will that give you enough poke? Most motors need 3 volts at least to produce reasonable power and torque.

I think so, these 7.mm motors I'm trying are turning a very high RPM at 1. volt with no load. If I can keep the prop-shaft-seal friction low (going to try 2 O-rings, with silicone-grease between them, first), that 1.2V battery should do the job.

[Slats]

Rick been there done that,
and it flopped. Thumbs Down

My electric torpedoes had one big problem - flotation
You will find you need as Andy put it - around 3 volts for enough torque transfer to the prop in the water. This is where the weight problem creeps in, along with torque roll which in my scale was too little to have counter-rotating props (which I countered to some degree with weight distribution and fin set up.

Back in the 90s there was a couple of great large scale (1/24 and 1/32 i think) electric torpedo kits you could buy - no more of these around - these were works of great craftsmanship, counterrotating props etc etc, the real deal.

Why do I like gas-
Its simple.
There is no flotation problem
There is no battery requirements
There is no bearing
There is nothing on each shot to water proof
There is no kill switch requried
There is likely (awaiting confirmation from David) no or very little ballast impact on the boat.

The latter problem is potentionally huge with a battery (weighty torpedo).
Don't believe me do this test:

Take a sub that you operate regularly. Take her down in to PD. (Tank should be full of water.

Take one AAA battery plant it via rubber band on the nose - what happens to your trimmed out boat? Its now a little nose heavy - ok multiply that by say a factor of say 8 to represent 4 medium to small type 3 v powered electric torpedoes - you now have a boat that when "armed" is in a completely different ballasted state to when not loaded with torpedoes.
To over come this you need some way of equalising the weight of the loaded tubes when the tubes are unloaded. Its not impossible but the only way I did this was by making the torpedo overscale in length and made each torpedo positive. I had a separate tank on board to pump in /out water to counteract the release of each torpedo.

In short the system was complicated and craptacular; and was uninstalled from my Permit PDQ.

Rick, stop flogging this dead horse mate - IMO you are wasting your time and resources.

Just wait for the system - David will answer my question list (he is kind of busy):) and you will be blown away as to just how good the system is.

Best
J

[Slats]

Forgot to mention another reason why I like Gas...

wake trail left by bubbles very realistic.I'll drink to THAT!

J

[toppack]

I really appreciate the suggestions, But I've seen battery powered, single-prop, torpedos that work and operate the way I want mine to. So I know it can be done.
Now wheather I'll be able to construct them with one good hand is another concern but i want to try for several reasons. The biggest ones being that I like to create my own designs and fabricate them and the other being that I know I'll not be able to afford David's creation, since he's going to be very proud of it, and rightfully so. :D LOL
Thanks,

[Slats]

I really appreciate the suggestions, But I've seen battery powered, single-prop, torpedos that work and operate the way I want mine to. So I know it can be done.
Now wheather I'll be able to construct them with one good hand is another concern but i want to try for several reasons. The biggest ones being that I like to create my own designs and fabricate them and the other being that I know I'll not be able to afford David's creation, since he's going to be very proud of it, and rightfully so. :D LOL
Thanks,

Rick - have you got a link to the torpedoes you mention?

Next - I only call it a deadhorse as I have been in this game a long long time.
In fact the Australian Subregatta (every 2 years) is a torpedo fest - all are gas and for the reasons I have spelled out. That regatta brings several hundred years experience to it.

I am not knocking innovation or discovery - you do what you want - but a lot have tried what you have and are attempting, some following the route you are documenting and have got it wrong more for the reasons of physics than lack of effort or resources.

Remember here, the problem is not just simply building the torpedo, it’s the release system, the integration with the boat etc etc.

I'll be happy to give you congratulations for your efforts and success. It takes guts to keep going especially with just the one hand. Indeed well done that you are in this hobby!

As far as affordability goes mate – lets see what the price is first. Indeed how do you know you can’t afford it unless you know the prices, which I understand have not been released? All too often in this RC sub game, I see people (particularly the new guy) thinking that they will build their own boat and WTC to save money. For most, in the end, the duplication of costly errors of inexperience add much more cost than buying off the shelf. Been there done that too.

Best

John:)