Today's Message Index:
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1. 03:13 PM - smoke on! (Oscar Zuniga)
2. 05:09 PM - Stitts covering (Scott Schreiber)
3. 07:32 PM - Re: smoke on! (Rcaprd@aol.com)
Message 1
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Well, 41CC may have a new habit soon. Smoking. I got the test apparatus
hooked up securely enough to allow ground testing. Consisted of an
automotive windshield washer reservoir and pump bungee'd to the side of the
airplane with a small 12V motorcycle battery sitting on that and also lashed
on. Flex hose to the exhaust stack with the last few inches a piece of
copper tubing, to a brass fitting threaded into a boss welded to the stack
just where Mike Cuy said to put it. Two small holes drilled through the
stack wall, again as per Mike's specs for size and location.
One large bottle of baby oil went in the reservoir, engine was started and
warmed up (tail tied to my car's trailer hitch and wheels chocked), then
1500 RPM and I gave it a blip of smoke. Wowza!!!!! She makee smokee! Let
that one waft past the hangar behind me and blipped it again. And again.
And againnnnnn!!!!!!!! Looked back and the hangar was full of smoke, and a
nice trail downwind about an eighth of a mile in the light breeze. Decided
to call it good before the volunteer fire department showed up, since my
apparatus had proven itself.
Couple of things I noticed right away. One: the grass beneath and behind my
airplane was all oily, so was my car parked downwind (tail of the airplane
was tied to it, remember?). So were the gear legs. Maybe when the smoke is
on with the airplane is flying it doesn't oil everything up so bad, but it
consumed 3/4 of the bottle of baby oil and it looked like a good deal of it
was unburned or maybe the smoke condenses.
Second, when I would apply smoke the engine would start to stutter a bit on
that side. It was definitely the smoke doing it. Not sure why, but again-
maybe with higher power settings such as used in flight, it won't do that.
Kind of strange.
It will be nice to get the system complete and operational, but at least I
know that my components will work and the smoke volume should be about right
when the airplane is in flight. I don't know how Chuck "the master of baby
oil" Gantzer does it, pirouetting his airplane in a cloud of smoke. He must
get out of the airplane covered in oil!
Took my brother up for a flight after that and made a pretty decent x-wind
landing. Pietenpols forever!
Oscar Zuniga
NX41CC
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
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Message 2
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Looks like I am going stitts for my covering. I have some great folks
who will help me learn the job. Can anyone here give me an approximate
idea of what I need to order for fabric, adheasive etc. ?
-Scott Schreiber
Message 3
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Hey Oscar,
I figured you would be picking up the habit of Smoking !!
Caution: It is very habit forming !!
The way I originally set up my system, was with an automotive after-market
windshield washer tank & pump.
Here are the original problems & solution that I came up with:
1) The location I placed the plastic tank on the left side of the engine
mount was a little too high - just a little above the point where it enters the
exhaust stack. Gravity caused the oil to dribble out into the exhaust when the
pump was NOT on.
2) Another problem I had originally, was that I ran the line down, then back
up to the 'Tee' in the center, where it split and goes to each side, and when
the tank would run dry, and I would refill the tank with Baby Oil, the pump
would cavitate, and I would have give the system 'Mouth to Mouth
Resuscitation', by blowing into the filler hole with the pump on, in order to bleed
the air
out of the pump.
3) The tank was not big enough, which limited the 'Smoke On' time.
I cured all three problems by building a larger fiberglass tank (holds
about a gallon) with a nipple glassed in the bottom of the tank, and locating
the tank down low in the center of the firewall, and located the pump separately
at the lowest point in the system.
The lines going to the exhaust should be long enough so heat will not
travel down the metal, and affect the plastic tubing attached to it. I ran the
two brass (should have been copper) lines from the exhaust pipes all the way to
the Tee, using compression fittings, then a clear tygon tubing from the pump
to the Tee.
I cut a steel union in half, radiused them to the exhaust pipe, welded
one on each of the aft pipes about 1 1/2" down from the flange, and drilled
ONE # 60 hole down low through the exhaust pipe after it was welded. I located
the hole down low in the fitting, so it would drain all the oil out into the
exhaust and would not collect and harden up in the fitting, after the pump was
turned off.
The system has been trouble free ever since, and even when I do the
'Smoke Dance' on the ground, I only get a little oily dirt on the landing gear
legs, and maybe a little bit on the leading edge of the stabilizer. I've never
had any engine stutter with the smoke on, even at the lower power settings.
Here is the page on my web site: _http://nx770cg.com/SmokeSystem.html_
(http://nx770cg.com/SmokeSystem.html)
Chuck 'Baby Oil' Gantzer
NX770CG
SMOKE 'EM IF YA GOT 'EM !!!
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