3.5" Cylinder Assist

[wlambing]

I am getting close on getting my 1/72 Skipjack trimmed. Standard process; submerge, try stuff, pull apart, glue in foam/weight, repeat. Each session, I have about 1/3 cup of water in the battery compartment and a good 1/2 cup in the engineroom. The last one had a drop of water on top of the safety float valve, and all sessions have shown droplets inside the clear PVC tubing. Stuck valve? How to fix? Blowing into the submerged cylinder does not show any other leaks, although the MBT vent pushrod could be in cahoots!

TIA,

Bill

[biggsgolf]

What subdriver?

[He Who Shall Not Be Named]

I am getting close on getting my 1/72 Skipjack trimmed. Standard process; submerge, try stuff, pull apart, glue in foam/weight, repeat. Each session, I have about 1/3 cup of water in the battery compartment and a good 1/2 cup in the engineroom. The last one had a drop of water on top of the safety float valve, and all sessions have shown droplets inside the clear PVC tubing. Stuck valve? How to fix? Blowing into the submerged cylinder does not show any other leaks, although the MBT vent pushrod could be in cahoots!

TIA,

Bill

That's major-league flooding.

Look at the LPB pump housing -- is there any water in there that should not be there? Anywho... bring it along this weekend and I'll give the entire system the hairy-eyeball, Bill.

One more thing: any cracks from bulkhead retaining screws that have migrated over the internal bulkhead O-rings?





David

[SubSteve]

Man I'd drive a long-ass distance to take Dave up on that offer!

[wlambing]

I'll eyeball the cylinder today. I recognize the cracks in the pictures! :) That's my 2.5" cylinder. Tub trials will continue today. Yes, it will be at the base.

David and I have a unique relationship. I have known of him since the 70s and he of me since the 90s. He does the driving, and I feed him. It all works out!!

[He Who Shall Not Be Named]

I'll eyeball the cylinder today. I recognize the cracks in the pictures! :) That's my 2.5" cylinder. Tub trials will continue today. Yes, it will be at the base.

David and I have a unique relationship. I have known of him since the 70s and he of me since the 90s. He does the driving, and I feed him. It all works out!!

The perfect symbiotic relationship (still not clear who's the host and who's the parasite... **** it, just as long as I get fed, who cares!)

[wlambing]

An old crack reawakens! There's an existing crack across the bottom bulkhead bolt hole, running from the MBT flood port and extending aft into the engineroom a distance of perhaps 1 1/4". It had been mitigated years ago, but seems to have tried an end-around with 3 branches of about 1/4" total. I drilled, filled and used catalyzed CA and solvent for acrylics, covered with a healthy dose of RTV and capped with good, old fashioned electrical tape. Todays water intrusion was: Fwd- 1/3 thimble, Aft- 1/3 cup. I'm skeptical on that one, as the o-ring the crack transverses still appears to have a nice squish band at that location. We'll see what tomorrow brings

[He Who Shall Not Be Named]

An old crack reawakens! There's an existing crack across the bottom bulkhead bolt hole, running from the MBT flood port and extending aft into the engineroom a distance of perhaps 1 1/4". It had been mitigated years ago, but seems to have tried an end-around with 3 branches of about 1/4" total. I drilled, filled and used catalyzed CA and solvent for acrylics, covered with a healthy dose of RTV and capped with good, old fashioned electrical tape. Todays water intrusion was: Fwd- 1/3 thimble, Aft- 1/3 cup. I'm skeptical on that one, as the o-ring the crack transverses still appears to have a nice squish band at that location. We'll see what tomorrow brings

Enough. I'll take it back home with me, work up a new cylinder and populate it with the gear from the cracked unit. You've ****ed that old dog enough, Bill.

[wlambing]

Thank you, sir. I shall enough it then and consult with you this weekend. See you Friday! Safe traveling,

Bill

[wlambing]

HWSNBN,

I got to wondering yesterday about the possible need to replace some o-rings in the future, so, I thought I would ask if you would publish the specs for 2.5", 3.0", and 3.5" o-rings used in D&E Subdrivers?? The rings in my cylinder for the 1/72 Gato are not present in the stern end cap. I suspect some grumpy old, curmudgeonly, too, old o-ring-thiever has perhaps made off with them!

[He Who Shall Not Be Named]

HWSNBN,

I got to wondering yesterday about the possible need to replace some o-rings in the future, so, I thought I would ask if you would publish the specs for 2.5", 3.0", and 3.5" o-rings used in D&E Subdrivers?? The rings in my cylinder for the 1/72 Gato are not present in the stern end cap. I suspect some grumpy old, curmudgeonly, too, old o-ring-thiever has perhaps made off with them!

I can't give you a straight answer, Bill, as I custom size the O-ring to the cylinder.

This owing to the fact that all extruded cylinders are of inconsistent I.D. dimension's. This coupled with variance's in bulkhead O-ring groove depth and width means each situation demands a specific diameter O-ring to achieve a tight seating between O-ring-bulkhead-cylinder. It varies from bulkhead-cylinder to bulkhead-cylinder.







Get one of those large-size O-ring kits (you're looking for 1/16" wall O-rings) and mix and match as required.

David
Master of Chaos

[wlambing]

Got it! Appreciate the explanation, and I understand from the years of worshiping the NSTM!!