flyrotary@lancaironline.net Mailing List Archive

Hi Ed, I have removed the blade and replaced it with a spare new one I had from my 3 blade configuration. I'll make another exhaust, but with thicker tube.. Last one was too thin and as you said it vibrated the welds untill they failed. The good news is that I just got a job across the road from my hangar. I'm a desk driver at aircraft exhaust overhaul facility. Buly > > From: "Ed Anderson" <eanderson@carolina.rr.com> > Date: 2006/09/06 Wed AM 07:57:30 EDT > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> > Subject: [FlyRotary] Departed Exhaust > > Hi Buly, great to hear about your flight and happy to hear the missing > exhaust component did not cause damage - however, I would inspect the prop > blade very closely to make certain no small cracks in blade - particularly > near the hub. > > Yes, I have pulverized sufficient metal by trying different exhaust > internals to say that the shock of the exhaust pulse particular with a turbo > block is tremendous. I have destroyed 1/8" thick stainless steel in a > matter of hours. It appears that if a exhaust component is perpendicular to > the front of the shock wave, the impact on the component is such to reduce > its life to almost nil. If the component is at an angle then its life is > much longer. The constant flexing of the metal at 200 times/sec at 6000 rpm > caused by the strong exhaust pulse fatigues the metal extremely rapidly. > > The joke around my airport is "You can hear Ed long before you can see > him!" - my response is that its a safety feature to let others know I am on > my way inbound{:>). > > Ed > Ed Anderson > Rv-6A N494BW Rotary Powered > Matthews, NC > eanderson@carolina.rr.com > http://members.cox.net/rogersda/rotary/configs.htm#N494BW > ----- Original Message ----- > From: "Bulent Aliev" <atlasyts@bellsouth.net> > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> > Sent: Wednesday, September 06, 2006 7:17 AM > Subject: [FlyRotary] Re: OT: Gardenhose as level > > > > Joe, it was a "shake down" alright with an exhaust problem like yours. > > on Sat we did some takeoffs and landings with the CFI Ron Miller. With > > gross weight of 1850 pounds, on takeoff I'm getting 6500-7000 rpm and > > climb rate of about 1000 fpm. Than we went to 1500 ft over the airport > > and i did some steep turns etc for about 40 min. It flies like a dream > > (compared to C-172 :). Transponder did not work again. > > Next day we got a waiver for the transponder and headed to an old > > uncontrolled military field with two huge 5000 ft runways, so i can > > practice landings and takeoffs. So we took off and headed for our > > destination at 3500 ft over alligator country. Pulled back the power to > > 5000 rpm and we were cruising at 140 knots. Nothing spectacular, but i > > kept the prop at low pitch to go easy on the engine. 15 min later, we > > heard a bang and the plane felt like we run over a rock. First reaction > > look for a place to land. But soon everything checked out and the engine > > kept running normal with temps at 185-187F degrees with OAT at 85F. > > Landed OK at our destination and taxied to the FBO. Ron got out first and > > started looking, but can not find anything wrong? I got out and noticed a > > slight scuff like a drag mark 3" wide on one of the Ivo blades starting > > about where the exhaust would be and going to the tip. The las oval piece > > of my shiny new exhaust was missing. Mystery solved. Ivo is a one tough > > prop to survive a 3" long 3" diam. SS pipe going hitting the blade. We > > continued with the training and I was getting good at it but with lots of > > full power takeoffs and not enough time for the engine to cool down, some > > of the coolant boiled out on takeoff and we came down to replace to add > > more coolant and check under the hood. Added some water, cleaned the > > plugs, just in case and took off again. > > By now it was a sweltering heat with jungle like humidity and after few > > landings, we headed home. The trip was uneventful, the engine was running > > fine around 5000 rpm. The biggest surprise later was after I removed the > > SS heat shields from around my new exhaust pipes. one pipe was totaly > > separated at the weld, another was half cracked. > > Sound familiar Joe:) The exhaust pulses must be ferocious? people on the > > ground said they can hear me long before they can see me coming:) > > More later. Got to go to work. > > Bulent "Buly" Aliev > > FXE Ft lauderdale, FL > > http://tinyurl.com/s5xw8 > > > > On Sep 5, 2006, at 11:47 PM, Joe Hull wrote: > > > >> OK - it's supposed to be "Shake down cruise" - don't tell me you broke > >> down > >> somewhere!! > >> > >> But congrats on flying it anyway!! > >> > >> Joe Hull > >> Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA) > >> Redmond (Seattle), Washington > >> > >> > >>> -----Original Message----- > >>> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On > >>> Behalf Of Bulent Aliev > >>> Sent: Tuesday, September 05, 2006 8:20 PM > >>> To: Rotary motors in aircraft > >>> Subject: [FlyRotary] Re: OT: Gardenhose as level > >>> > >>> > >>>> > >>>> Guess I need to buy some expensive clear hose ..... > >>>> Finn > >>> > >>> Finn, if you buy the right size, one day you can used for your fuel > >>> lines on the next airplane. Worked very well on the first one :) > >>> Buly > >>> Finally checked out in my plane. > >>> Did my first 100 mile "cross country". Or should I say "break down > >>> cruise" :), > >>> > >>> -- > >>> Homepage: http://www.flyrotary.com/ > >>> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > >> > >> > >> -- > >> Homepage: http://www.flyrotary.com/ > >> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ >