I'M WANTING TO BUILD A WTC. I HAVE NOTICED THAT ON ALL THE WTC I'VE SEEN, THERE IS A BRASS ROD HOLDING THE PUSHRODS IN PLACE. WHAT IS THE SEAL TO KEEP WATER OUT? CAN SOMEONE PLEASE GIVE A DETAILED DISCRIPTION OF HOW THESE SEALS WORK?.....ALSO.....WHAT IS THE COMMON OPINION OF THE DUBRO PUSHROD SEALS AS A SUBSTITUTE?

THANKS
CHRIS

What your seeing is not a brass rod it is a cup style seal in a brass base. They work alot like the seals in an automatic transmission and seal tighter the more pressure they feel. You can find these at www.mikesubworks.com
Another option is offered by www.caswellplating.com They offer an oring style seal that is encapsulated in alumilite.
Also you could use an aircraft serco boot and just silicone it in. These are great if you need some slop in your throw and they are very cheap. You can et these at mikes subworks aswell.
Lastly you can try the same style the Dumas Akula comes with. It is simply a silicone hose glued to the bulk head and a tight fitting brass rod going through it. I dont recomend this for deeper dives.

Any more questions?

DO YOU HAVE ANY OPINION ON THE DUBRO BOAT PUSHROD SEALS?

Your caps lock key seems to be stuck down.

nope havent heard of those before sorry. You have a picture or link. Ive prob seen them before.

http://www3.towerhobbies.com/cgi-bin...&I=LXD589&P=ML

that should help

chris

ah yes.. i dont know anyone that uses them but they look similar to the servo boot i use on my akulas fwd servo. Try them out and let me know if they work at depth

Ahh ...those are bellows, they work fine. They will tolerate a bit of misalignment too.

These are much cheaper: http://www3.towerhobbies.com/cgi-bin...?&I=LXGBJ5&P=M

Also, does anyone know local stores or places (hardware stores, bike shops?) where one might find rubber bellows? Seems kinda ridiculous to me to ship something worth 2$ over from the States...

Graupner bellows are part #3356 used in all Engel sub kits. Robbe bellows as per their U47 is #1400. I imagine your LHS should be able to order them for you.

you can use the ones that rc airplanes have just aswell and your LHS should carry them aswelll