[AR] Re: Continuation of small hybrid motor design
- From: "Troy Prideaux" <troy@xxxxxxxxxxxxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Fri, 24 Jul 2020 11:49:41 +1000
Ken, that was for Mark (no me), nevertheless the link/reference will certainly
be recorded into my list of valuable component links, ta :)
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of roxanna Mason
Sent: Friday, 24 July 2020 11:36 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Continuation of small hybrid motor design
Troy, here's one source of spring energized lip seals that we at Truax
Engineering obtained some of our LOx seals.
https://www.bayseal.com/Spring-Energized-(PTFE)-Seals_7.php
K
On Thu, Jul 23, 2020 at 4:59 PM <mark.spiegl@xxxxxxxxx
<mailto: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!
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