---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Sun 09/14/08: 11 ---------------------------------------------------------- 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 _____________________________________ Time: 04:36:39 AM PST US From: "Ted Cowan" Subject: Kolb-List: resonance 912 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 _____________________________________ Time: 05:10:08 AM PST US Subject: Kolb-List: Re: Hurricane Ike/2008 Kolb Homecoming From: "John Bickham" 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 _____________________________________ Time: 05:36:12 AM PST US Subject: Kolb-List: Re: fuel line? From: "Thom Riddle" >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 ________________________________ Message 4 _____________________________________ Time: 07:17:29 AM PST US Subject: Kolb-List: Re: Hurricane Ike/2008 Kolb Homecoming From: "John Bickham" 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 _____________________________________ Time: 09:18:37 AM PST US From: "trader@fotoubuff.com" Subject: Kolb-List: Re: fuel line? 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 _____________________________________ Time: 10:26:51 AM PST US From: "Steven Green" Subject: Re: Kolb-List: 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 _____________________________________ Time: 11:22:08 AM PST US From: "pj.ladd" Subject: Kolb-List: nice flight 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 _____________________________________ Time: 11:29:37 AM PST US From: gary aman Subject: Re: Kolb-List: 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 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 _____________________________________ Time: 11:49:38 AM PST US From: gary aman Subject: Re: Kolb-List: Re: fuel line? 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 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 ____________________________________ Time: 12:34:39 PM PST US Subject: Kolb-List: Re: Firestar II Center of Gravity? From: "lucien" 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 ____________________________________ Time: 11:47:10 PM PST US From: "Richard Girard" Subject: Kolb-List: Resonance 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.