Steve Thomas wrote:

Jerry,

Thanks for the info. I am building a 4130 PPC frame so th tubing is not open
between the connections. Do you guys drill holes where the tubes are to be
welded so that the air and oil can pass throughout the entire frame?
DEFINITELY

YES.--1/8 TO 3/16" HOLES



--
Have a good one!

Steve
www.americanspiritppc.com
"Jerry Wass" wrote in message
...
YUP, Best thing is Boiled linseed oil--(can't hardly find raw anymore)
Weld a 1/2 collar of 1/8" pipe ftg to lower front cross pc. Weld same to
rudder post near top. put a couple of little valves on each ftg. Borry a
refrig
vacuum pump, attach to top ftg. attach couple ft of plastic hose to lower
valve.

place in bottom of gallon container, pour in couple qts of linseed oil,
CLOSE
BOTTOM VALVE, pull vacuum on fuselage---if you can't pull a good vacuum,
you gotta leak---pressure it up & get a young kid ( that ain't been
listenin to
loud music) & have him listen for leaks---WELD UP LEAKS---tRY AGAIN,
YOU PROBABLY MISSED ONE!
Then pull vacuum, shut vacuum valve( don't want erl in vac pump), open
lower
valve, suck in 2 or 3 qts of oil. shut both valves. leave oil in a day or
so,
rotating fuselage 4 times. If you got a little argon, attach to top ftg,
open
bottom ftg, &
blow out excess oil. The argon keeps oxygen out while oil is draining,
the oil
combines with any remaining oxygen, and turns to paint if it sees any
oxygen,
thereby sealing any teensy weensy holes. DONT WELD ON FRAME ANY
MORE!!

Steve Thomas wrote:

When you guys weld up your 4130 airframes do you use any type of rust
inhibitor in the tubes? I have read about some that you spray in the
tubes
ait crawls up the walls to coat the whole inside, and it is supppose to
leak
out of any weldment that had a pinhole in it. I am just curious if you
use
anything like this or not. Thanks!

--
Have a good one!

Steve
www.americanspiritppc.com