---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Fri 06/18/21: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:03 PM - Tailwheel (K I) 2. 01:52 PM - Re: Tailwheel (1957grnchev@bluemarble.net) 3. 04:24 PM - Re: Going to a 72" prop (Charlie Mike) 4. 05:19 PM - Re: Tailwheel (Salvador Sahagun) ________________________________ Message 1 _____________________________________ Time: 01:03:58 PM PST US From: K I Subject: Kolb-List: Tailwheel Hi List, I have a Mark III classic with a Rotax 912 UL. I want to put on an Aviation Products 6" tailwheel on because some of my takeoffs and landings are off runway, gravel, dirt & grass. I currently have a 4" tailwheel made by Aviat ion Products that weighs 2 lbs. 12.3oz. The new 6" tailwheel weighs 4 lbs. 8.1 oz. Have any Mark III Classic owners changed to the larger / softer tailwheel? If so, has it been an improvement over the 4-inch wheel? Is there a reason NOT to make the change? Kurt Kolb Mark III Classic Rotax 912UL ________________________________ Message 2 _____________________________________ Time: 01:52:17 PM PST US From: 1957grnchev@bluemarble.net Subject: Re: Kolb-List: Tailwheel Two extra pounds hanging that far back will likely change your weight and balance significantly. Tail heavy is never good! Or as they say, "if at first you don't succeed.. tail heavy is not for you.." On 2021-06-18 4:03 pm, K I wrote: > Hi List, > > I have a Mark III classic with a Rotax 912 UL. I want to put on an > Aviation Products 6" tailwheel on because some of my takeoffs and > landings are off runway, gravel, dirt & grass. I currently have a 4" > tailwheel made by Aviation Products that weighs 2 lbs. 12.3oz. The > new 6" tailwheel weighs 4 lbs. 8.1 oz. > > Have any Mark III Classic owners changed to the larger / softer > tailwheel? If so, has it been an improvement over the 4-inch wheel? > Is there a reason NOT to make the change? > > Kurt > Kolb Mark III Classic > Rotax 912UL ________________________________ Message 3 _____________________________________ Time: 04:24:44 PM PST US Subject: Kolb-List: Re: Going to a 72" prop From: "Charlie Mike" Richard Pike wrote: > All done and flying great. Had a few teething issues: > > Initially started out with an extra 3/8" motor mount spacer at the rear, giving it a bit of downthrust to counteract any possible pitch over tendencies. Flew it four times that way, evaluating handling while trying to get the Warp Drive prop pitched properly. (Made me really appreciate the Ivo's ultra simple prop adjustment method!) > > Short version: the airplane simply felt wrong. Constantly fighting it as it kept trying to nose up at most every throttle setting, plus on final with minimal power, it just did not feel right. > Removed most of the rear spacer, now it handles just like it always did, deviation from stock thrust angle is two extra 1/16" washers on top of the rear Lord mounts. > Spent one afternoon playing with brass shim stock between the prop hub and the gearbox prop flange, finally got all three blades tracking within 1/16" of each other. > Spent several days trying to get the prop pitched for a 6300 rpm climb and a 6500 rpm max in level flight. Finally got within 50 rpm and called it quits. > Plugs look good, EGT gauges were lying to me. The new dual EGT gauge arrived today, no hurry putting it in, wx is rainy today, uber windy tomorrow. > > Anyway, everything is now as it ought to be, it runs smoother than it ever has, and the climb rate is typically right at 1,000'/min solo. Looks like normal cruise is going to be about 53-5400 rpm at 65 mph. And boy is it quiet! > > Now I need a pretty day so I can take some pictures of that old 2-seater trike, it's 582/w electric start, B box, BRS, and my 68" Ivo, get that thing sold and out of the hangar. $3k if you guys know anybody looking for such. > > Thanks for the suggestions & advice along the way. Richard, is this setting with the lord mounts flipped? Or standard orientation and just spacers at the rear? -------- Kolb Slingshot 582, C gearbox. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502441#502441 ________________________________ Message 4 _____________________________________ Time: 05:19:56 PM PST US From: Salvador Sahagun Subject: Re: Kolb-List: Tailwheel I did something like that on my firestar 1. I had to take it off after one flight and it only weighed like 3lbs Very dangerous Salvador Sent from my iPhone > On Jun 18, 2021, at 3:52 PM, 1957grnchev@bluemarble.net wrote: > > > Two extra pounds hanging that far back will likely change your weight and balance significantly. Tail heavy is never good! Or as they say, "if at first you don't succeed.. tail heavy is not for you.." > >> On 2021-06-18 4:03 pm, K I wrote: >> Hi List, >> I have a Mark III classic with a Rotax 912 UL. I want to put on an >> Aviation Products 6" tailwheel on because some of my takeoffs and >> landings are off runway, gravel, dirt & grass. I currently have a 4" >> tailwheel made by Aviation Products that weighs 2 lbs. 12.3oz. The >> new 6" tailwheel weighs 4 lbs. 8.1 oz. >> Have any Mark III Classic owners changed to the larger / softer >> tailwheel? If so, has it been an improvement over the 4-inch wheel? >> Is there a reason NOT to make the change? >> Kurt >> Kolb Mark III Classic >> Rotax 912UL > > > ------------------------------------------------------------------------------------- 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.