Today's Message Index:
----------------------
1. 04:36 AM - resonance 912 (Ted Cowan)
2. 05:10 AM - Re: Hurricane Ike/2008 Kolb Homecoming (John Bickham)
3. 05:36 AM - Re: fuel line? (Thom Riddle)
4. 07:17 AM - Re: Hurricane Ike/2008 Kolb Homecoming (John Bickham)
5. 09:18 AM - Re: fuel line? (trader@fotoubuff.com)
6. 10:26 AM - Re: resonance 912 (Steven Green)
7. 11:22 AM - nice flight (pj.ladd)
8. 11:29 AM - Re: Firestar II Center of Gravity? (gary aman)
9. 11:49 AM - Re: Re: fuel line? (gary aman)
10. 12:34 PM - Re: Firestar II Center of Gravity? (lucien)
11. 11:47 PM - Resonance (Richard Girard)
Message 1
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Well, thanks to you all with your wonderful suggestions concerning the hum
hum of my little 912. I want to report that I still have it live and strong
as ever. I built two 60 degree elbows for the exhaust flanges of my titan
exhaust system -- did not help. actually it made the exhaust louder. did
not affect the resonance. I already went from none to four inch spacer and
back to two inch which I have today. I was told it was not the gear box
because there was no scrap in the oil. (I still believe it is the spacers
in the box or an elliptical gear or something that is not actually tearing
it apart. I dont seem to be able to get the 'AUTHORIZED DEALERS AND REPAIR
CENTERS' to care or want to do anything about it. I even offered to pay
them out of my pocket.) I have padded just about everything padable. I
put my windows in - Haucks suggestion - wow, was that hot inside. I like
free air while I am flying. No joy, still there. I was told by a prop
person, Kiev Props that their prop would help in a lot of ways but the prop
was probably not the producer of the sound, just the amplifier. So, there I
am. When we get to the Homecoming, you all can hear it from the ground and
while I am in the air and solve this mystery for me. Looking forward to
seeing you all again. Ted Cowan, Alabama, Slingshot, 912 UL
Message 2
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Subject: | Re: Hurricane Ike/2008 Kolb Homecoming |
Jimmy,
Glad to hear you are good! Good move with the plane. I considered moving my plane
to higher ground for Gustav. The hanger that I would have moved it to came
out worse than the one you showed. A bonanza was totalled in that hanger.
Just lucky and a little blessed.
Wish I could join you at the TNK. Daughter is enroute to Utah right now to meet
her mom. Home from Iraq. They will be home Tuesday.
Hope you get power back by the time you get back from KY. It took 9 days for us
to get power.
Hope to meet up with you guys soon and visit.
Do not archive.
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
"NO FEAR" - If you have no fear you did not go as slow as you could have
!!!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4219#204219
Message 3
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>From Dave Bidelow:
Quote:
Tygothane C210 ESTER is formulated for all type of fuel
Superthane ESTER is supposed to be a near equivalent.
Jack, do you have a source for these two types of fuel line?
Thanks.
Dave,
Both of the Tygon brand lines mentioned in this thread as well as St. Gobain's recommended F4040A Tygon are available from McMaster-Carr at www.mcmaster.com .
They are my preferred supplier because of their excellent customer service, fast
shipping and good prices.
--------
Thom Riddle
CFI-SP
Power Plant Mechanic
N221FA Allegro 2000 912UL
N197BG FS1/447
--------------------
Scratch any cynic, he said, and youll find a disappointed idealist.
George Carlin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4220#204220
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Subject: | Re: Hurricane Ike/2008 Kolb Homecoming |
Just checked on Gary H.
He and his Kolb (kolb related), house, hangar, and all are OK.
Even got power a little while ago.
Do not archive.
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
"NO FEAR" - If you have no fear you did not go as slow as you could have
!!!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4224#204224
Message 5
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Hi Tom and gang
\ the 4040 is better than most other tubing, and is a great choice.
Just so people dont go and use some of the bad blue stuff that was out
there. it looked good, felt good, worked good for about 90 and then
cracked, rotted and gelled and fell apart. if it doesnt say tygon 4040
or Tygothane c210 or Superthane I will no longer use it. although i do
have some NOS 1/8 primer line that was not labeled on the tubing. but
says C210 a on the box of 100 ft.
My data was From both companys
http://www.tygon.com/Data/Element/Node/ProductLine/product_line_edit.asp?ele_ch_id=L0000000000000001506
I have called Saint-Gobain and New age, and many of the technicians
recommendation is the Ester base polyurethane. because of the extra
durability.
although the 4040 A is good the recommendation, and is highly used
for fuel, it is softer.
the c210 is the extra toughness and and durability, again this is
from the manufactures, I have also read misleading or incomplete
descriptions on other websites that sell the stuff. actually
contradictions, that is why I have called both mfgs.
there is always errors even in opinions.
ps> mcmaster carr says not use c210 in water it will crack. ( where did
this come from?) Surely not StGobain.
at this point we all have to do research.!
surely we are not running or keeping water in our tanks, we are not
keeping water around our tubing, and getting it wet in the rain is
not going to deteriorate the line. It may just mean dont use it on a
boat and keeping it submerged in the Hull. with fuel inside it?
I have had Tygothane on my planes for 6+ years (it is probably time to
change) but has little signs of any change(aging etc) whatsoever.
Jackofmosttrades
>Dave,
>Both of the Tygon brand lines mentioned in this thread as well as St. Gobain's recommended F4040A Tygon are available from McMaster-Carr at www.mcmaster.com .
>
>They are my preferred supplier because of their excellent customer service, fast
shipping and good prices.
>
>--------
>Thom Riddle
>CFI-SP
>Power Plant Mechanic
>N221FA Allegro 2000 912UL
>N197BG FS1/447
>--------------------
>
Message 6
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Subject: | Re: resonance 912 |
Ted,
Is the noise cyclicle in amplitude? If so there may be two fundamental
frequencies creating a "beat". Is the wing fabric noticable tighter on one
wing than on the other, in the prop area?
If I remember correctly you said that the noise was independant of engine
speed. What about air speed, does it change with air speed? Does it do it
in a high speed decent with the engine at idle.
Did you say it would do it during a static run up?
Steven Green
Hope to see ya'll in London soon
Message 7
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Part of a post I sent to Russ. Just thought it might interest someone.
My comments about filling etc. applied to the Kolb. My pump is just a
plastic pipe, about 3/4"bore, 3 ft long, straight with a cap to screw
into a barrel (which I have never used) the pump is hand operated,
straight push pull with a stroke of about 5 inches. This drives the fuel
through a flexible plastic hose into the tank.Not very fast I admit but
as a light pump to carry about in the KOlb it works fine.
Just had a pleasant 40 minute flight. No wind but bad viz until mid day,
cleared this afternoon so I grabbed the chance. My field is only about
15 minutes away.
Flew along our valley, which is about 10 miles wide with about 600ft
high hills either side. Very smooth. Pushed her up to 90 mpg at 3000
revs. Solid as a rock. Usually cruise at 70 at 2600 revs.
Flew over Avebury stone circle and Silbury Hill, largest manmade hill in
Europe. No one knows why it was built. Also the remains of a few crop
circles still showing. One romantic farmer had mowed his field in the
shape of a gigantic heart.
Wind has changed today and the sun is almost obliterated with a high
haze. More rain during the night I would expect. Will it never stop?
This summer has been almost wiped out.
Pat
Message 8
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Subject: | Re: Firestar II Center of Gravity? |
My FS-2 with b box and pull start and my 170#s required some ballast to get into
the recommended cg range.I think it could be possible with that combination
of equipment and pilot to have an issue. Mine required 15# in the nose to feel
right, although many on this list have had success aerodynamically trimming
their Kolbs to fly well without the addition of ballast. My 2 cents worth.
----- Original Message ----
From: Goodone <goodone41@verizon.net>
Sent: Saturday, September 13, 2008 4:38:57 PM
Subject: Kolb-List: Firestar II Center of Gravity?
Would there be any Center-of-Gravity (c.g.) concerns with a Firestar II powered
by a Rotax 503+"C" Gear Box+ Rotax Intake Silencer+3 Blade Warp Drive Prop? I
had a good friend that had an accident in a Firestar II that might well be explained
if this rather heavy power plant system would result in an aft c.g. He
was a rather slim fellow probably weighing around 160 lbs. I would appreciate
any information that you might provide.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4144#204144
Message 9
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Have had the pump primer o-ring seal fail on a FS.No leaks of fuel but a solid
string of bubbles entering the fuel line from the primer thru the T fitting.Was
part of the pre flight after that .Pull start then check lines for bubbles.
----- Original Message ----
From: Dana Hague <d-m-hague@comcast.net>
Sent: Saturday, September 13, 2008 8:10:48 PM
Subject: Re: Kolb-List: Re: fuel line?
At 07:55 PM 9/13/2008, John Hauck wrote:
Still looking for valid reasons to look at the little
bubbles in the clear plastic line. ;-) No one has come up
with a good reason yet...
I don't want to look at the little bubbles... I want to look and verify
that there AREN'T any little bubbles!
Almost lost my US on its first flight, when a fuel line blockage cause
either air to be sucked in or cavitation, I don't know... but it was a
steady stream of bubbles that I saw after getting it back down. The
blockage passed enough fuel for anything less than full throttle, and the
carb bowl held just enough to get airborne up to around 100' where things
got exciting... now part of my preflight is to look for bubbles during a
full power runup.
That's a good enough reason for me.
-Dana
--
Grow your own dope! Plant a politician!
Message 10
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Subject: | Re: Firestar II Center of Gravity? |
Goodone wrote:
> Would there be any Center-of-Gravity (c.g.) concerns with a Firestar II powered
by a Rotax 503+"C" Gear Box+ Rotax Intake Silencer+3 Blade Warp Drive Prop?
I had a good friend that had an accident in a Firestar II that might well be
explained if this rather heavy power plant system would result in an aft c.g.
He was a rather slim fellow probably weighing around 160 lbs. I would appreciate
any information that you might provide.
My old FS II was setup exactly like that (well with a clutch but also without silencers
on the engine) and the builder put 10lbs of ballast in the nose to get
the CG to come out right.
He flew it for a while without the ballast; with him (large guy about 210 lbs)
and full gas it was right at the aft limit. He didn't like the way it flew and
put the ballast in to correct it.
Monster performance with that huge prop tho... well worth the additional weight....
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4273#204273
Message 11
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Ted, I went back through all the posts about your resonance problem and the
one thing I can't find mention of under the things you've tried is balancing
the carbs. Before you spend money on tearing your gearbox apart or a new
prop you might want want to consider spending less than $100 on a set of
vacuum gauges. You can buy them all set up and ready to use from suppliers
like Lockwood or buy the gauges and damper valves from someplace like
McMaster Carr. I did the latter and didn't save a dime over Lockwood's
price. :-{ The entire procedure is documented in the Rotax manual ( I'll
look it up in the morning and get you chapter and verse ) and takes less
than an hour. First you do the mechanical synching then the pneumatic with
the gauges. I've documented my experience with my HKS and despite the fact
that I couldn't hear or feel anything wrong, the carbs were 3" vacuum
different at 3000 RPM. When I pneumatically balanced them engine RPM
increased to 3500.In one of your posts you commented that the rum rum was
like a twin with the engines out of synch. Not having your carbs synched is
basically that. Two cylinders are carrying more load than the other two. I
don't know that this is the be all end all of your problem but if you
haven't done it recently I'd recommend you do it or get it done if for no
other reason than it's the cheapest of all the other options you've proposed
doing.
Rick
PS. I also stick to my other recommendation that I sent to you off line. If
you can't kill the resonance directly softer engine mounts will dampen it.
If the good folks at TNK don't carry mounts of varying hardness they might
be able to point you to their supplier so you can contact them and see if
they're available.
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