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RE: Pen tube torpedoes? Possible!! - 3/26/2006 2:41 PM   
cyclops2


 

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Status: offline 		I did a quick hook up last night and I have the 15 - 20 or 30 second timed motor runs at a 3 amp. load at 14 volts car battery.
I want to have it switch off quicker than it does now. Hopefully a couple of days should have a accurate cool switcher.

What volts and amps. are we looking at right now for the motors ?

Rich

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RE: Pen tube torpedoes? Possible!! - 3/26/2006 3:51 PM   
Cobalt Saber



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Status: offline 		These torps are going to be so cool when they are done!

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RE: Pen tube torpedoes? Possible!! - 3/27/2006 4:31 PM   
cyclops2


 

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Status: offline 		Good news.
I have the timer working using Radio Shack 555 timer parts.
From 10 to 120 seconds.
Too bulky using their capaciators. Will replace with smaller.

Will start work on the power transistor and Automatic Resettable circuit breaker.

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RE: Pen tube torpedoes? Possible!! - 3/27/2006 7:21 PM   
cyclops2


 

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Status: offline 		Reed switches arrived. They are working fine.

Auto C. B. is still left.

Do you guys think it is worth my while to package this into a 1/2" diameter X 5" long, running torpedo ?


What distance should the motor stop running ?

Scale speed of 50 knots is about 1.5 to 2 mph ?

How many are interested in 1/2" diameters
5/8"
3/4"
1"
larger ?

And how many of each ? Send me a PM if interested.

It is understood that they run reasonable straight.

Rich

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RE: Pen tube torpedoes? Possible!! - 3/28/2006 3:27 AM   
cyclops2


 

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Status: offline 		Good day.
Ran the timer up to 60 and 120 seconds at 10 amps of current. No heat, perfect shut off.
Automatic C.B. resets to run condition, only when placed in submarine torpedo tube.
Lucky bonus.
No unexpected starts while being handled.

Working on the torpedo bodies and motors.

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RE: Pen tube torpedoes? Possible!! - 3/28/2006 4:20 PM   
Cobalt Saber



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Status: offline 		cyclops2, Man you are doing good!
looks to me like you have it down.
do you have any instructions?


-Cobalt Saber

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RE: Pen tube torpedoes? Possible!! - 3/28/2006 11:03 PM   
cyclops2


 

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Status: offline 		I ruined 2 ---555 timers due to a solder bridge on the Radio Shack PCB.

I did NASA soldering. 68 years old had to be some of the problem.

The body tubes should arrive shortly. A little blue foam on each end, to a lathe , done.

How about where we can get those smaller than 1/2" diameter motors ?
I am trying to get servo motors or GWS jobs.

I would definately go to a PCB for any reliability.

As usual, this turned into a full blown Engineering project. We are close to a completion.

Stay the course!

Rich

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RE: Pen tube torpedoes? Possible!! - 3/29/2006 2:55 AM   
Cobalt Saber



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Status: offline 		Will they be able to be launched from a sub?



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RE: Pen tube torpedoes? Possible!! - 3/30/2006 12:11 AM   
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ORIGINAL: Cobalt Saber

Will they be able to be launched from a sub?



-Cobalt Saber



I hope...

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RE: Pen tube torpedoes? Possible!! - 4/10/2006 8:29 PM   
Cobalt Saber



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Status: offline 		How are they coming????

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RE: Pen tube torpedoes? Possible!! - 4/13/2006 12:58 AM   
cyclops2


 

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Status: offline 		I have the timer working perfect with a simple cheap reed switch. Electricaly we are good.

Size is a problem. Those pager motors are something else. They scale out to 1/84 scale.
Who is going to cut up some props a 1/4" in diameter, with a driveshaft of .031".
Motor shaft is --31 thousandths of a inch in diameter X 65 thousandths long.

Rich


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RE: Pen tube torpedoes? Possible!! - 4/13/2006 4:15 PM   
Cobalt Saber



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< Message edited by Cobalt Saber -- 4/13/2006 4:17 PM >

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RE: Pen tube torpedoes? Possible!! - 3/30/2007 12:43 AM   
matt123456


 

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Status: offline 		hey

how do you connect the rubber band to the prop??

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RE: Pen tube torpedoes? Possible!! - 3/30/2007 8:45 PM   
Captain Nemo12



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Status: offline 		If you want to do a test, try superglueing the rubber-band to the prop-shaft if it's hollow (I used the tube from a Q-tip).

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RE: Pen tube torpedoes? Possible!! - 4/3/2007 3:00 PM   
ZoomZoom-RCU



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Status: offline 		Just a thought. And I will add here that I am no submariner, but have played with a few. Has any one ever thought of rocket power. This comes to mind because as kids we used to shoot those little bottle rockets under water all the time just to see how far they would go, just like torpedos. They burn fine under water as long as you can get them started in a dry place(we would shoot them from tubes just above the surface down into the water). So, for simplicities sake, as opposed to little propellors and rubber bands(complicated mehcanisms), why not use a small estes (I believe its called a Mosquito) rocket motor. you simply mount it in a small aluminum or tin torpedo tube with the wire to ignite it running up into the torpedo with a solar igniter etc. Then to launch all you need is an electric switch. To make the torpedo tube airtight, a piece of saran wrap siliconed to the mouth should do the trick. This serves two purposes, makes the launch tube airtight, but is also easily penetratable by the sharp end of the torpedo once it is fired. Also is relatively easily reloadable, that is unless you make the kind with a little warhead.....ahem, but I wont go into that right now.

ZZ.

< Message edited by ZoomZoom-RCU -- 4/3/2007 3:01 PM >

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RE: Pen tube torpedoes? Possible!! - 4/3/2007 5:23 PM   
Jonjoe


 

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Status: offline 		I was thinking y not put a mini co2 cartarage at the end of the torpedo with a about 10bbs in front of it with a pin and when the torpedo hits somthing it will fire the bbs at the target making it usful for r/c combat and 4 fun but this will only be practical on a disposable one any thoughts mabie usefull on a gas powered torpedo
Thanks!

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RE: Pen tube torpedoes? Possible!! - 4/3/2007 7:20 PM   
Cobalt Saber



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Status: offline 		Jonjoe,

That would not work. BB's don't shoot underwater very well. They may go a foot or so but thats it.
And plus, That would be one bulky torpedo....


CS

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RE: Pen tube torpedoes? Possible!! - 4/3/2007 8:45 PM   
Captain Nemo12



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quote:

ORIGINAL: ZoomZoom-RCU

Just a thought. And I will add here that I am no submariner, but have played with a few. Has any one ever thought of rocket power. This comes to mind because as kids we used to shoot those little bottle rockets under water all the time just to see how far they would go, just like torpedos. They burn fine under water as long as you can get them started in a dry place(we would shoot them from tubes just above the surface down into the water). So, for simplicities sake, as opposed to little propellors and rubber bands(complicated mehcanisms), why not use a small estes (I believe its called a Mosquito) rocket motor. you simply mount it in a small aluminum or tin torpedo tube with the wire to ignite it running up into the torpedo with a solar igniter etc. Then to launch all you need is an electric switch. To make the torpedo tube airtight, a piece of saran wrap siliconed to the mouth should do the trick. This serves two purposes, makes the launch tube airtight, but is also easily penetratable by the sharp end of the torpedo once it is fired. Also is relatively easily reloadable, that is unless you make the kind with a little warhead.....ahem, but I wont go into that right now.

ZZ.


Good idea but the Seran wrap would be way too thin to counter the effects of water pressure, I would suggest perhaps an airtight torpedo tube door.

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RE: Pen tube torpedoes? Possible!! - 4/4/2007 1:14 AM   
Jonjoe


 

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Status: offline 		Wouldnt a rocket motor just plunge streight to the bottom or go on a upredictable path how would you make it run flat!
Thanks
JJ

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RE: Pen tube torpedoes? Possible!! - 4/4/2007 1:58 PM   
ZoomZoom-RCU



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Status: offline 		Thats a good question Jonjoe. All of the rockets I have ever fired under water went very straight with only occaisional erratic tracking. I believe this is due to the long shaft or tail that hangs off the back of all bottle rockets that acts as a stabiliser. It works in the air, so it also works in the water....which basically acts just like air only a bit thicker. So, this is easily solved on a more compact torpedo type basis by adding a circular stabilizer to the tapered rear of the torpedo, you know like you've seen on those old WWII bombs. They stabilize the bombs in flight, they will do the same for the torpedo. The rocket projects out from the middle of this circular sleeve. As long as the torpedo isnt made extremely long, the stabiliser shouldnt ned to be too large.
Thats a good point about the waterproof doors Nemo, but that seems a pretty difficult construction project. And synchronising them to the firing of the torpedo in the tube would be tough. The nice thing about a breakaway (film type) covering is it allows the actual pressure from the firing of the the rocket in the tube assist in the "breaking free" of the lit torpedo from its chamber. Almost an auto ejector, and it fires the rocket when dry, before the tubes are open. If there was some sort of watertight breakaway film or mechanism that you think would hold up to the pressure, I think its viable. Any ideas? Interesting discussion.

ZZ.

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RE: Pen tube torpedoes? Possible!! - 4/4/2007 7:03 PM   
forklift


 

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Status: offline 		*sigh* people people! PLEASE give us a video of these little rubber band torpedos and battery powered torpedos so we can see some speed on them and how well they work!

Don't make a grown man beg!

< Message edited by forklift -- 4/4/2007 7:04 PM >

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RE: Pen tube torpedoes? Possible!! - 4/5/2007 1:43 AM   
Captain Nemo12



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ORIGINAL: forklift

*sigh* people people! PLEASE give us a video of these little rubber band torpedos and battery powered torpedos so we can see some speed on them and how well they work!

Don't make a grown man beg!


Have faith!!!

At the moment I'm still trying to get my U-boat finished before building these torps, I'd like to see other people attempt a build.

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RE: Pen tube torpedoes? Possible!! - 4/5/2007 4:07 AM   
forklift


 

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Status: offline 		Well, you asked for it! :P I'll gut a pen right now and see what happens!

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RE: Pen tube torpedoes? Possible!! - 4/5/2007 9:21 PM   
forklift


 

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Status: offline 		Well, here she is!



The nose has been stapled and the rubber band hooked into it.



The tail assembly is the rubber band tightly taped to a toothpick (where my fingers are pinching it) The toothpick has both points clipped off. The toothpick is then run through the 'pointed' conical part of the pen, and then a 1:72 propeller from my S-100 model is the prop used, fitted to the toothpick.



Notes: I threaded the rubber band through the pen by first taking the ink cartridge and taping one end of the band to it, running it through so I could get the band without using tweezers to try and reach inside the tube. Also, I bet this thing won't go very far. I doubt it would cross my sink if it were possible for me to wind it up tight enough without popping it. The thing barely squeals for a second before coming to a complete stop. Water friction included into the equasion, it probably won't spin any longer. I'll add a post confirming this after I test it.

All in all, it's a good way to waste 10 minutes with standard stuff you find around the office: 1 pen (with removeable nose cone and end cap), 1 small pieces of tape, 1 staple, 1 rubberband, and the odd prop from a model.

But I don't see it replacing any scale battery powered torpedoes any time sooon.

< Message edited by forklift -- 4/5/2007 10:22 PM >

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RE: Pen tube torpedoes? Possible!! - 6/13/2007 2:15 AM   
GreenAce92



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Status: offline 		Hi,

I got a question about these torps. Are they waterproof? And they do float on to right?

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