Topic: Darnell Biber midget sub (Read 12564 times)

Subculture · « **Reply #25 on:** April 09, 2011, 07:58:46 PM »

You're pumping water into a bag and that is constricted by a half round pipe enclosure. The air in the cylinder will be compressed as the bag fills. But this will push water out through the pump until the pressure equalizes.

If you want to do a simple test, grab a mouthful of water a blow it through a tube connected to the pump- you'll see it trickles out through the other side of the pump. Now an average fit person can only develop 1-1.5psi, and I'm asthmatic so my lungs aren't quite tip-top. You don't need to put much effort in BTW.

What's the size of tank in relation to the cylinder?

Patrick Henry · « **Reply #26 on:** April 09, 2011, 08:49:36 PM »

Approx 2/3rds of the cylinder length, and half the diameter.

Subculture · « **Reply #27 on:** April 09, 2011, 08:58:12 PM »

So assuming you are only going to fill up a third of that you're looking at between 1.5-2 psi. If you fill it completely nearer to 5 psi. I would fit a valve, but it's your build.

Patrick Henry · « **Reply #28 on:** April 09, 2011, 09:59:11 PM »

We seem to have wandered off topic...I only wanted a drawing for the Biber!

ACTion · « **Reply #29 on:** April 09, 2011, 11:06:31 PM »

Quote from: U33 on April 08, 2011, 07:58:41 PM

Am I ok to stick the circuit boards into the case bottoms with double sided tape...ie, servo tape?
Rich

Better than nowt, but don't write the word "warranty" large and loud anywhere.......................

(Just joking, Rich)
DM

Patrick Henry · « **Reply #30 on:** April 10, 2011, 06:42:33 AM »

As if I would, chief...

Patrick Henry · « **Reply #31 on:** April 12, 2011, 09:17:03 AM »

It all fits...just.

The space to the rear of the motor is reserved for the two mini servos to actuate the torpedo release mechanisms.

hollowhornbear · « **Reply #32 on:** April 12, 2011, 10:20:39 AM »

hi Rich,
will be hunting out the drawings, latter.
seeing you mention torpedo release, you do know their nearly 3" in diameter and not the 2" mouldings supplied.
putting it mildly their HUGE!!!

Patrick Henry · « **Reply #33 on:** April 12, 2011, 10:24:43 AM »

Mornin' Kev...

Yes mate, Alf Blake is making them for me...they will release and drop, then off they will go in a straight line. They will have a power on/off button mounted in the nose, so when they hit a target it cuts the power off to the motor.

Thanks for helping out with the drawings, much appreciated..

Rich

Subculture · « **Reply #34 on:** April 12, 2011, 10:44:55 AM »

Oh no, not another king size torpedo wielding lunatic! Had enough of that with Dave Wright punching holes with his silicone bronze tipped WMD's (weapons of miniature destruction) at last years Summer Dive-in, and they were half the size. I've heard a whisper that Ramesh is planning counter-measures......

Patrick Henry · « **Reply #35 on:** April 12, 2011, 10:47:15 AM »

These aren't really(?)that dangerous...although with Alfie wielding the lathe, anything can happen. They are only surface running though...

Rich

hollowhornbear · « **Reply #36 on:** April 12, 2011, 10:50:14 AM »

so were Dave Wrights we thought. and they punched a nice hole in ramesh' typhoon!
King Size not the words KONG size more like they'll be close to the size of my elusive disappearing Seawolf! but cool

Patrick Henry · « **Reply #37 on:** April 12, 2011, 10:52:17 AM »

Well, you know what they say..."man with big torpedoes should be kept clear of...."

Rich

hollowhornbear · « **Reply #38 on:** April 12, 2011, 11:00:05 AM »

to help with the detailing, i suggest you get hold of a set of John Lambert's drawing 3 sheets.
http://www.lambert-plans.com/
click warships then submarines scroll down.

Patrick Henry · « **Reply #39 on:** April 12, 2011, 11:02:56 AM »

Got them already Kev....a nice man sent me a set. He's a very nice man.

A very very nice man.

Rich

Subculture · « **Reply #40 on:** April 12, 2011, 11:16:00 AM »

Quote from: U33 on April 12, 2011, 10:52:17 AM

Well, you know what they say..."man with big torpedoes should be kept clear of...."

Rich

That reads a bit like a euphemism.

Patrick Henry · « **Reply #41 on:** April 12, 2011, 11:26:25 AM »

Language, Timothy!

Rich

Patrick Henry · « **Reply #42 on:** April 14, 2011, 09:08:53 AM »

Kevin is right, the torpedoes are big...

The one in the pic is 2.75" in diameter, which is still 0.25" too small. Off to B&Q later today...

hollowhornbear · « **Reply #43 on:** April 14, 2011, 09:32:54 AM »

I know, had some finger slippage earlier scale if i calculated correctly is 1:6.8 or at least measuring my mouldings it is! this makes the torps 75mm or approxiamately 3" in dia.
not sure i'd want one of those running loose. not to mention the trim changes when launched. from the info available on the web, this was a problem as they used to pop to the surface on after launching the torps, were they where then sunk by surface fire from the ships they were attacking.

Patrick Henry · « **Reply #44 on:** April 14, 2011, 09:36:35 AM »

That may well be a problem Kev, but at least I can claim it's a perfectly scale manoeuvre...

Subculture · « **Reply #45 on:** April 14, 2011, 12:42:02 PM »

It'll run a lot better minus the torpedos- it's like strapping a couple of 1/96th scale nukes each side of the hull- lot of drag.

I like the Italeri box art for this boat, looks like an underwater tiger. Not sure how authentic that colour scheme is, but I think it's nicer than boring old grey.

Patrick Henry · « **Reply #46 on:** April 14, 2011, 12:46:17 PM »

It's very authentic...see pic.

hollowhornbear · « **Reply #47 on:** April 14, 2011, 07:42:54 PM »

how about this one?

Patrick Henry · « **Reply #48 on:** April 14, 2011, 07:46:42 PM »

Well, it's certainly....different. I wonder what the rivet counters would make of THAT?

hollowhornbear · « **Reply #49 on:** April 14, 2011, 07:59:42 PM »

What can they say photographic evidence, proves it exists. Would make seeing it submerged easier( before you chip in Andy)

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Author Topic: Darnell Biber midget sub (Read 12564 times)

Patrick Henry

Patrick Henry

ACTion

Patrick Henry

Patrick Henry

hollowhornbear

Patrick Henry

Patrick Henry

hollowhornbear

Patrick Henry

hollowhornbear

Patrick Henry

Patrick Henry

Patrick Henry

hollowhornbear

Patrick Henry

Patrick Henry

hollowhornbear

Patrick Henry

hollowhornbear