---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Sun 08/24/08: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:32 AM - Re: Idle fluctuations (Jack B. Hart) 2. 10:47 AM - Kolb time needed W Tennessee. (Thumper) 3. 11:31 AM - Re: Idle fluctuations (herb) 4. 11:58 AM - Re: Idle fluctuations (John Hauck) 5. 12:24 PM - Re: Idle fluctuations (Jack B. Hart) 6. 06:24 PM - ins (Russ RKI Photo) 7. 06:41 PM - Re: Kolb List: Insurance (william sullivan) 8. 06:49 PM - Re: ins (John Hauck) 9. 07:34 PM - Kolb Photos (John Hauck) 10. 09:00 PM - Re: Idle fluctuations (DAquaNut@aol.com) 11. 09:12 PM - Re: B- box (DAquaNut@aol.com) 12. 09:52 PM - Re: B- box (R. Hankins) ________________________________ Message 1 _____________________________________ Time: 10:32:23 AM PST US From: "Jack B. Hart" Subject: Re: Kolb-List: Idle fluctuations >I have a situation with my 447 where after running the engine at 3000 rpm or better, and then closing the throttle, the rpms drop to around 2200 and then slowly come back up to 2500 where I have the idle set. Upon landing it seems like it is going to die when I close the throttle. I would be afraid to close the throttle while flying for fear it would die. Any ideas on what is up? > Ed, If the humidity is high, I would bet on carburetor ice. Jack B. Hart FF004 Winchester, IN ________________________________ Message 2 _____________________________________ Time: 10:47:10 AM PST US Subject: Kolb-List: Kolb time needed W Tennessee. From: "Thumper" Anyone within a half days drive of Memphis consider taking me up in a two seat Kolb? I am just about ready to fly my recently purchased Ultrastar and need re-familiarized with it. I will pay your fuel bill. I have been getting some time is a Cub but everything I have read and remember there are many differences I need briefed on. Just some landings and several hours should be enough. My time 20 years ago was in MXL 2's and MXL amounted to over 40 hours plus several hours in a Zenair Zipper (any of those still around?). Anyone will ing to help. Thanks. -------- Dennis Long Oakland TN Kolb Ultrastar Owner Read this topic online here: http://forums.matronics.com/viewtopic.php?p 0273#200273 Attachments: http://forums.matronics.com//files/100_1356_812.jpg ________________________________ Message 3 _____________________________________ Time: 11:31:48 AM PST US From: herb Subject: Re: Kolb-List: Idle fluctuations I do not claim to be an expert on Carbs...but------:-) With the mechanical idle screw set all the way in...spring compressed completely, usually ....the carb idle circuit is no longer effective...so when you close the throttle...the jet needle may go so low toward the main jet so as to restrict flow? (that is your idle circuit now) Check your needle and drop the clip a notch... These carbs,Mikuni's also, were designed to operate with engines wthat have clutches or variable belt drives that have no load at idle... Herb At 01:28 PM 8/24/2008, you wrote: > > >I have a situation with my 447 where after running the engine at 3000 rpm >or better, and then closing the throttle, the rpms drop to around 2200 and >then slowly come back up to 2500 where I have the idle set. Upon landing it >seems like it is going to die when I close the throttle. I would be afraid >to close the throttle while flying for fear it would die. Any ideas on what >is up? > > > >Ed, > >If the humidity is high, I would bet on carburetor ice. > >Jack B. Hart FF004 >Winchester, IN > > ________________________________ Message 4 _____________________________________ Time: 11:58:59 AM PST US From: "John Hauck" Subject: Re: Kolb-List: Idle fluctuations These carbs,Mikuni's also, were designed to operate > with engines wthat have clutches or variable belt drives that have no > load at idle... Herb Herb: Maybe for ATVs, snow machines, but the carbs for Rotax and Cuyuna engines are set up for props without clutches, I would think. I am no expert either. Trying to use common sense. Ed D's engine is unloaded when he is in landing configuration. No load on prop. I bet if the engine and carb are tuned correctly, he won't have that problem. Just guessing, of course. john h mkIII ________________________________ Message 5 _____________________________________ Time: 12:24:25 PM PST US From: "Jack B. Hart" Subject: Re: Kolb-List: Idle fluctuations At 01:58 PM 8/24/08 -0500, you wrote: > >I bet if the engine and carb are tuned correctly, he won't have that >problem. > John brought up a good point. If your EGT's are running a little lower than normal, it might be caused by a slightly over rich idle setting. Turn the idle air screw out 1/8th of a turn and see what happens. The idle circuit continues to produce a fuel flow no matter what the throttle setting. If your EGT's are running a little higher than normal rotate the idle air screw the opposite direction. Jack B. Hart FF004 Winchester, IN ________________________________ Message 6 _____________________________________ Time: 06:24:53 PM PST US From: Russ RKI Photo Subject: Kolb-List: ins List Who have you found to be a good insurance co? Thanx, Russ Kinne do not archive ________________________________ Message 7 _____________________________________ Time: 06:41:35 PM PST US From: william sullivan Subject: Kolb-List: Re: Kolb List: Insurance - Russ- I believe Dana suggested "First Flight", but you had better confi rm this. - ------------------------- -------------- Bill Sullivan ________________________________ Message 8 _____________________________________ Time: 06:49:34 PM PST US From: "John Hauck" Subject: Re: Kolb-List: ins > Who have you found to be a good insurance co? > Thanx, > Russ Kinne Russ K: I use EAA indorsed aircraft insurance. Global, I think. How good are they? Don't know. Have not had a claim with them since I dropped AVEMCO some years ago. Or was it AVEMCO dropping experimentals??? I think that was the way it was. I pay 1,500.00 dollars for 30,000.00 hull coverage in flight and on the ground with no deductible. That package also includes $1,000,000.00 liability insurance. My insurance covers only me as the pilot. One exception is a authorized flight test pilot. Don't have to worry about that because I do all my own work on Miss P'fer ( P fer plane). Haven't needed to make a claim since I wiped the gear out from under Miss P'fer 1 July 2000, Muncho Lake, BC. Glad I had it then. I had AVEMCO. Got the right adjuster out of Vancouver, BC. He sure was a big help getting the airplane back to Alabama and getting me the money to rebuild. Hope Global will support me the same way should the need arise. Take care, john h mkIII - First flight March 1992. And.............she keeps on flying..... ________________________________ Message 9 _____________________________________ Time: 07:34:09 PM PST US From: "John Hauck" Subject: Kolb-List: Kolb Photos Hi Gang: My MKIII looks right at home, knee deep in fire weed in front of Worthington Glacier, a little bit north of Valdez, Alaska, during my 2004 flight to the Far North. Miss P'fer has been a terrific little airplane. This was her third flight to America's northernmost State. john h N101AB MKIII - 2,800+ hours on the airframe. ________________________________ Message 10 ____________________________________ Time: 09:00:09 PM PST US From: DAquaNut@aol.com Subject: Re: Kolb-List: Idle fluctuations In a message dated 8/24/2008 1:59:20 P.M. Central Daylight Time, jhauck@elmore.rr.com writes: Ed D's engine is unloaded when he is in landing configuration. No load on prop. I bet if the engine and carb are tuned correctly, he won't have that problem. John and Jack, Just so we are on the same page. The 447 seems to run fine when the air temp is above 90 which it is most of the time. I have gone back to stock jets except I have a 40 Idle jet because it seems to load up. my egts are around 1000* below 3600rpm. they go up to 1200* at times when at 4100 - 4500 rpms . At 4900 _ 6300 rpm its around 1000*- 1100* I have it propped at 6300 rpm tied down. I dont recall this problem before I installed the 40 idle jet. I guess I can try the 45 idle jet. We have 75% humidity most of the time. When the weather cools the midrange egt temps go to 1250 or better. Not good according to Rotax. Ed Diebel FF(62) **************It's only a deal if it's where you want to go. Find your travel deal here. (http://information.travel.aol.com/deals?ncid=aoltrv00050000000047) ________________________________ Message 11 ____________________________________ Time: 09:12:01 PM PST US From: DAquaNut@aol.com Subject: Re: Kolb-List: B- box John H, Have you ever adjusted the gearbox spring preload on any of your b-box geardrives? I am at 100 hours and the rotax manual says the springs need to be checked. Do you know what happens if the springs get too loose. It talks of adjusting with the use of shims. I dont want to have to send my gearbox to Miss.,if I dont have to Ed D **************It's only a deal if it's where you want to go. Find your travel deal here. (http://information.travel.aol.com/deals?ncid=aoltrv00050000000047) ________________________________ Message 12 ____________________________________ Time: 09:52:02 PM PST US Subject: Kolb-List: Re: B- box From: "R. Hankins" Ed, I'm not John, but I have checked the pre-load on the spring washers in my b-box twice. Once at 119hrs and again at 452hrs. They were within spec both times. I still have the shims and replacement springs I bought for the first teardown at 119 hrs. One symptom of loose springs is a lot of metal showing up on the magnet in the gearbox drain plug. The dogbone (knuckle) between the big gear and the prop shaft will begin to move and wear more than it should and you'll see the results on the magnet. Hope this helps -------- Roger in Oregon 1992 KXP 503 - N1782C Read this topic online here: http://forums.matronics.com/viewtopic.php?p 0364#200364 ------------------------------------------------------------------------------------- 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.