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    The Dragonfish revisited.

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    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Tue Feb 19, 2013 4:29 pm

    My rear cone is glued down, Marius...

    I'd do your rear planes exactly the same as mine are. Maybe you could make the rear cone removable, a couple of small self tapping screws would secure it nicely, and wouldn't show if you paint them black.
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    profesorul
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    Re: The Dragonfish revisited.

    Post  profesorul on Tue Feb 19, 2013 5:05 pm

    OK,I got the ideea.

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Wed Feb 20, 2013 10:29 am

    My hands and fingers are telling me that today is a 'day off' day, so it's no modelling for me today.

    Here's the wtc so far...just need to install the linkages later. I'm going to try the repaired and strengthened tray, just to see if it will last, and for how long...in the meantime I can build the new designed one ready to install as and when and if it's needed. New couplings and stub shaft are on order.




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    tattooed
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    Re: The Dragonfish revisited.

    Post  tattooed on Wed Feb 20, 2013 12:43 pm

    rich why dont you glue some half round waste pipe under the motor to support it mate job done and no worries

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Wed Feb 20, 2013 1:26 pm

    Not enough room underneath mate, battery packs fit under the tray.

    Not a problem now though, I've had the new version of the tray explained to me by the designer, and I've just started drawing it up on cardboard. Once it's built properly it will solve everything in one go.

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Wed Feb 20, 2013 1:36 pm

    This is the original cardboard mock up for the new tray, complete with built in motor mount and raised sides. Mine won't need the side pieces, but the basic idea is very similar. This one was built for a totally different boat, but the basic idea is very similar to what mine will look like when it's done.






    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Wed Feb 20, 2013 4:13 pm

    The asute amongst you will have noticed the use of CAD to produce this mock up.

    (CAD...cardboard aided design)
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    tattooed
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    Re: The Dragonfish revisited.

    Post  tattooed on Wed Feb 20, 2013 4:21 pm

    wont it go soggy rich

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Wed Feb 20, 2013 5:20 pm

    It won't be getting wet, son...my wtc's don't leak!
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    acrowot (Geof)
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    Re: The Dragonfish revisited.

    Post  acrowot (Geof) on Thu Feb 21, 2013 9:22 am

    Richard(Admin) wrote:It won't be getting wet, son...my wtc's don't leak!

    famous last words did not leak but you did not say it wont HA HA
    mind you a good idea making a card board mock up i would not of thought of that

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Thu Feb 21, 2013 9:50 am

    Oh, ye of little faith...I was always taught to think positive in any matters adhering to model submarines. If there's a chance of it leaking, then think positively that it will not.

    (It's never worked yet, but I keep trying!)

    The cardboard mock up wasn't my idea, Geoff...but it's a damn good one, and saves a fortune in wasted styrene sheet.
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    profesorul
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    Re: The Dragonfish revisited.

    Post  profesorul on Thu Feb 21, 2013 10:03 am

    I think You are a winner most of the time because "positive thinking means positive bouiancy"...what do You say. (laughing)

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Thu Feb 21, 2013 10:42 am

    Very good, Marius...I'll remember that!

    The couplings arrived this morning, so I've been able to make up and fit the stub shaft. Now all I need is the tail prop shaft to arrive and that's another job done.




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    acrowot (Geof)
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    Re: The Dragonfish revisited.

    Post  acrowot (Geof) on Thu Feb 21, 2013 7:44 pm

    told you richard it will look good when you put all your bits in
    how do you hold the WTC in and stop it from rotating
    it looks like the hands are holding up ok your building faster than me and my hands are ok

    keep it up geof

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Fri Feb 22, 2013 9:33 am

    It's slow but steady, Geoff...I work inbetween painkillers. They knock me out, so I'm limited by how long I can stop awake!

    The wtc sits in the hull on three strips of self adhesive sponge tape, these stick to the hull and the sponge side supports the tube. Either end of the wtc will be a half circle of 3mm styrene glued to the hull bottom, they locate the tube in position and stop any fore/aft movement.
    The tube is then held securely by a good old elastic band hooked to two brass hooks either side of the hull. Easy to locate and easy to remove.

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Fri Feb 22, 2013 5:48 pm

    In between taking pain killers and then taking long naps, I've discovered that the water tight push rods maybe be water tight, but they put far too much load on the servos...the servos actually struggle to move the push rods, so I've ripped them out and ordered a packet of good old rubber bellows. Should have used them in the first place...they should be here in a few days, then I can get the wtc finished off.
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    tattooed
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    Re: The Dragonfish revisited.

    Post  tattooed on Fri Feb 22, 2013 6:27 pm

    who made the push rod mate or don't i need to ask

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Fri Feb 22, 2013 6:34 pm

    Say no more, mate..
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    acrowot (Geof)
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    Re: The Dragonfish revisited.

    Post  acrowot (Geof) on Fri Feb 22, 2013 9:53 pm

    Thanks for the imfo on fitting the WTC it will help when i get that far

    sorry to hear about the push rods it looks like im going to have a rethink
    i could use on for the on of switch i serpose
    take care geof
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    david f
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    Re: The Dragonfish revisited.

    Post  david f on Sat Feb 23, 2013 12:28 pm

    I think bellows are good in that they don't need much servo "grunt."

    Just make sure that you don't overstretch them with the servo travel or you will be sorry!

    Presumably the other seals are based on O rings, Richard?? O rings can be a bit stiff.

    Alfie uses tiny little O rings under shrink wrap very successfully and I think Nigel uses silicone tubing with the push rod sliding underneath. When last I saw Nigel and his seals that is!

    David

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Sat Feb 23, 2013 1:34 pm

    Correct David, these seals are basically a length of alloy tube with a ptfe bearing in each end. After popping one of the bearings out, a stainless steel pushrod is inserted into the tube with a tiny O ring added, then pushed right through and the final bearing inserted into the tube.

    I've tried them with and without the O ring, they work fine without it, but they leak, even with a good drop of grease added. With the O ring, you'd probably need a quarter scale servo to be able to use them. Shame really, they are a nice neat solution to the job..

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Sat Feb 23, 2013 2:44 pm

    Ah...Houston, we have a problem. Just thought I'd hook everything up to check it all fitted ok...and found that push rods foul the prop shaft connector.

    Now we'll see how good at bending brass wire I am...


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    tattooed
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    Re: The Dragonfish revisited.

    Post  tattooed on Sat Feb 23, 2013 2:51 pm

    what a bugger mate but these things happen and i'm sure you'll be able to sort it out it's more annoying than a problem and these things are sent to try us and if your a good boy there's a parcel in the post for you

    Tom(ADMIN)
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    Re: The Dragonfish revisited.

    Post  Tom(ADMIN) on Sat Feb 23, 2013 3:32 pm

    I've been a good boy, son...honest I have!

    And as if by magic...the problem has gone. Turning the pushrods upside down cured it.

    Simples!




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    tattooed
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    Re: The Dragonfish revisited.

    Post  tattooed on Sat Feb 23, 2013 4:27 pm

    had every faith in you rich knew you'd sort the problem right whats the next one to sort out?

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