Brodhead Pietenpol Association

Original Posted By: "Glenn Thomas"
Anyone up for a Loop ?----- Forwarded by Hans Vander Voort/GP/US/ALFALAVAL on 01/19/2006 05:23 PM----- "Dan Wilson" To 01/19/2006 05:18 cc PM Subject Re: Loops and rolls Greetings ! HansI just got off the phone with Vi Kapler from Rochester, MN. Vi knows moreabout the Piet than anyone else I have ever talked to. He worked alongside Bernie for many years. I asked him the question about rolls andloops. He stated that the Piet should not be rolled under anycircumstances. It is not stressed for this type of acrobatics. He did sayhowever that the plane can be looped. He has done it. He also said thatthe Ford Model A has plenty enough power to loop the Piet. When I askedabout the barrrel roll he simply stated that he would never attempt it.Please feel free to share this information with the piet family.DanDan WilsonFire ChiefAustin Fire Department________________________________________________________________________________Subject: Pietenpol-List: Corvair Crank

Original Posted By: Ron Franck
I got hooked on the idea of the affordable Corvair motor and bought 2 of them,the William Wynne conversion manual and a couple of WW's videos and I visit hiswebsite a couple times a week. Then last week, he posted new information regardingnitrided crankshafts and I'm trying to find out if anyone knows if thesestress fractures and cracks that he's found are ever found in an engine straightout of a car. I'd like to continue with the Corvair motor but his articlestates that the Embry-Riddle magnaflux machine he used to see the cracks revealeda lot more than the typical automotive magnaflux usually does. ...so myquestion is if I send him the best of my 2 to have the safety shaft installedand grinding, and nitriding, how do I know the shaft I'm sending is free ofcracks, even if I get a clean bill of health from the place that will do my magnafluxon the 2 of them. This is one of those areas I don't know that much aboutand I'm hoping someone else does. If the cracks are something that appearonly as a result of spinning a prop then I'll just have the crank I use nitrided.Anyone ever heard of a Corvair crankshaft failure (nitrided or otherwise?)Thanks,Glenn ThomasRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 19 Jan 2006 22:56:24 -0600

Original Posted By: "Ron Franck"
Daing...It's like "Where's Waldo" but I did see Mike's Piet... Just don't blink.----- Original Message -----

Original Posted By: "Glenn Thomas"
If you want all the scoop on Corvairs, go to their list and sign up:search the CorvAircraft archives at http://www.maddyhome.com/corvairsrch/index.jspto UNsubscribe from CorvAircraft, send a message to CorvAircraft-leave(at)mylist.netOther CorvAircraft list info is at http://www.krnet.org/corvaircraft_inst. ... __________

Original Posted By: Philip Miller
I just read a couple conversations on the crankshaft topic at maddyhome.com. I'mgoing ahead with the Corvair motor I have. I'll call him some time today orMonday and see what his approach to my question is. Thanks for these resources,they are very helpful.Thanks,Glenn ----- Original Message -----

Original Posted By: Kip and Beth Gardner

Original Posted By: Kip and Beth Gardner
Re: Pietenpol-List: Corvair CrankMy only question is how to truly know if the crankyou're sending him is free of stress fractures/cracks. After viewing 2 ofhis videos, I believe he's truly out there for the benefit of all of us tryingto find an affordable way to fly and seems to have amassed more knowledge thanI ever could have on this subject. His ethics were never in question andI, as I'm sure we all do, appreciate that he's a straight shooter. I don't have any more access to a magnaflux machine that I can trust than the yellowpages show me in the machine shop listings. Like everyone, I don't doubtthat nitriding is necessary. But, I do need to know if there is a way to getthe same quality of information about my crank that William had during his testingbefore I spend money preparing mine for flight. ...and I would think thateveryone flying a Corvair would have the same question in mind. I'm hopingto talk to him soon and I'll let you all know what he says. (30 minutes pass)Nevermind that, I just got off the phone with him and this is his advice to me.Do the ring test to see if your crank has any cracks. In his first assemblyvideo he shows a ring test where he hits the crank with a hammer and it ringsfor 20 seconds in a single clear tone. He said the crank he tested that hadthe crack, rings in a very sour note. He went on to say that the ring test islikely to be better than an automotive magnaflux done locally. He's workingon a video to clear up questions about the crankshaft and better educate us onstrategies to manage risk in this area. The video will demonstrate how to doa proper ring test and will show a ring test of a good crank and compare it toa cracked crank and the difference is supposed to be unmistakably clear. Hesaid the ring test was a reliable indicator of a crankshaft's health. He answeredthis and a number of other questions I had and took plenty of time to explainthe reasoning for his answers. We really are lucky to have a resource likethat that is just a phone call away.Glenn----- Original Message -----