Mark, here's a source of lip seals we used back in through the 70's - 90's.
https://www.bayseal.com/Spring-Energized-(PTFE)-Seals_7.php
Ken
On Thu, Jul 23, 2020 at 4:59 PM <mark.spiegl@xxxxxxxxx> wrote:
Troy Prideaux Wrote:
I’m assuming then we’re talking about a non-vented tank here?
Not exactly.. Im still stubbornly pursing fixed temperature (ie low)
Nitrous..
The tank vents until a predetermined pressure and temperature are reached,
then the vent closes. Since Nitrous rockets are long and thin, the
temperature variations in a 5,6,7,8 foot tank are huge.
Common sense says that high pressure, oxygen safe, dynamic seals are
really hard to make. However, the seal is not connected to a pump. It would
connect to a stirrer.
Is this a reasonable approach?
A small thin axle with paddles, a corkscrew, whatever..
The axle traverses the entire length of the tank, and out the top bulkhead.
Seal the top bulkhead with a standard oring, EPDM Fluorosilicon whatever
Connect the axle to a wimpy battery powered motor.
Run the motor at 10s of rpm.(*)
The dynamic seal wouldn't need to last long.
Another idea is building a static heat pipe. Heat pipes work well in
electronics, but I seriously doubt they scale.
--MCS
(*) Of course I already have a small motor to power Troy's pyroless
ejection system. :-D
Da'yam that one of my favorite ideas from this list!