Skipjack 1/72

[crazygary]

And yet another "job well done" from the "denizen of the cave"!

Rock on, M!!!

crazygary

[He Who Shall Not Be Named]

Thanks Mate I wasn't sure !! Off to grindy them down a touch....

Go get 'em, Bruce.

M

[HvyCGN9]

Thanks Mate I wasn't sure !! Off to grindy them down a touch....

[He Who Shall Not Be Named]

A Question! How many of these hull locating pins as seen in the pic are ground off??
[ATTACH=CONFIG]26247[/ATTACH]


Cheers Bruce

I grind back the male portion of the pin only enough to permit axial motion (needed as you push the upper hull down onto the lower hull), but enough male-female pin left to engage to register the hull halve against lateral motion when the hull halves are assembled.

M

[HvyCGN9]

A Question! How many of these hull locating pins as seen in the pic are ground off??



Cheers Bruce

[HvyCGN9]

email sent mate!!

I know alot about Surface warship stuff.....I also know that I know Sweet F@#$ all about sub techie stuff!! Which is why I like these forums havin two or three others building same hull gives great insight into setting one of these little monsters up.

Cheers Bruce

[He Who Shall Not Be Named]

Doh!! John pipped my comment at the post... David you're right about mentioning stuff like that. Often I just get on with tweaking and don't even consider it being someone else's issue.

... and use the sharp knife. I need to know all the gory details!

Tom, Al and Andy are masters at critique writing, So's John. Mark's learning how. The rest of you pussies -- what's the deal?! ... you must be scared I'll jump out of your monitor and choke you if you hit me with some constructive criticism. Loosen up, guys: you see something wrong, say so!

M

[alad61]

You guys who want the up-grade: e-mail me with your address and needs. But, only if you've bought the SD that uses this thing -- this ain't a frig'n charity!

M

email sent...

[alad61]

Doh!! John pipped my comment at the post... David you're right about mentioning stuff like that. Often I just get on with tweaking and don't even consider it being someone else's issue.

[He Who Shall Not Be Named]

Ooh...ahh that looks nice. It also looks like it gives a bit more open head room around the induction nipple too :) David will it be available as parts so we can retro fit?

You guys who want the up-grade: e-mail me with your address and needs. But, only if you've bought the SD that uses this thing -- this ain't a frig'n charity!

M

[alad61]

Ooh...ahh that looks nice. It also looks like it gives a bit more open head room around the induction nipple too :) David will it be available as parts so we can retro fit?

[He Who Shall Not Be Named]

Excellent and it kicks in much higher up the sail too.

J

Good catch, John. I forgot to mention that the lower aspect ratio float (same displacement as the original) will open with less sail out of the water, venting the SD's interior before too much vacuum is created.

I count on you bum's to catch stuff that is not working right -- Mark's comments about the old 1/72 SKIPJACK snorkel float is a fine example. This is how the product is improved.

M

[Slats]

Excellent and it kicks in much higher up the sail too.

J

[He Who Shall Not Be Named]

And here's what I came up with: the 'new' 1/72 SKIPJACK snorkel mechanism.



The original snorkel mechanism to the left, the new one to the right. Note that, as Mark suggested, the narrow loose fitting foam float can rotate too much resulting in misalignment between the induction nipple and rubber element -- a flooded induction line would result. Bad Ju-Ju!

The new snorkel float is a much lower aspect ratio. It's extended length meaning that there will be very little rotation between the float and induction nipple -- no flooding!



Note that the sides of the new float are in very close proximity to the inside of the sail, this coupled with the increased length of the float insures very slight rotational offset between induction nipple and rubber element -- no chance of flooding because the float wandered a bit within the sail.



Production of the new type 1/72 SKIPJACK snorkel mechanism.

M

[He Who Shall Not Be Named]

What if the float was a cylinder instead of a recatgular shape? Put a washer shaped rubber
seal pad on the top. If it rotates it always has a sealing surface and should be the same
distance from the wall. Use a plastic straw for the sliding surface in the middle of the float????

I investigated that but wound up with a ring-shaped rubber element production problem, specifically: labor intensive. Time is money.

The solution is to tighten up the gap tolerance between square sided float and inside surfaces of the sail. And a switch from closed-cell polystyrene to a slightly denser closed cell polyurethane (Renshape) float. I've also gone to a larger diameter rubber element disc size to cover what little torsional displacement presented by the float in relation to the induction nipple.

How timely. I'm making another production run of 1/72 SKIPJACK snorkel mechanisms today -- these changes in effect from now on.

Good stuff, Scott.

M