Wes, Prop orientation with respect to engine firing order is indeed important. My backing plate is marked so the prop always goes back the way it was removed. My flying buddy taught me to mark everything that you remove and expect to reinstall. David Cross Alon 5600F
---Wes Hays <[EMAIL PROTECTED]> wrote: > > I had the same problem with vibration in the 1900 to 2250 rpm range on my Alon when I first got it. In one of the manuals I received with my Alon, it talked about prop orientation on the engine. Sure enough when I checked, it was not as specified in the manual. My vibration was so bad it had broken the lord mounts on the instrument cluster. > > The manual I have states that with the #1 cylinder on TDC, the #1 blade of the prop should be in the 10:00 postion as viewed sitting in the pilots seat. I could not find out how to determine the #1 blade on the prop so if anyone could help me with that, I would appreciate it. When I asked my A&P about it, he looked at me like I had lost all my marbles. > > After I got home, I made the change and could not believe the difference. Although I had the same vibration @ around 1900 to 2250, it was not nearly as bad, and I could at least do some short term slow flight. (My wife was working on MCA). I still avoid these rpm ranges as a matter of practice because of the vibration. > > I don't know if you have tried this or not, but it did help mine. Please accept apologies if you have already tried this. > > Wes Hays > N6372V > Rotan, TX > > <HR> <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=text/html;charset=iso-8859-1 http-equiv=Content-Type> <META content='"MSHTML 4.72.3110.7"' name=GENERATOR> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#000000 size=2>I had the same problem with vibration in the 1900 to 2250 rpm range on my Alon when I first got it. In one of the manuals I received with my Alon, it talked about prop orientation on the engine. Sure enough when I checked, it was not as specified in the manual. My vibration was so bad it had broken the lord mounts on the instrument cluster.</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>The manual I have states that with the #1 cylinder on TDC, the #1 blade of the prop should be in the 10:00 postion as viewed sitting in the pilots seat. I could not find out how to determine the #1 blade on the prop so if anyone could help me with that, I would appreciate it. When I asked my A&P about it, he looked at me like I had lost all my marbles.</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>After I got home, I made the change and could not believe the difference. Although I had the same vibration @ around 1900 to 2250, it was not nearly as bad, and I could at least do some short term slow flight. (My wife was working on MCA). I still avoid these rpm ranges as a matter of practice because of the vibration.</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>I don't know if you have tried this or not, but it did help mine. Please accept apologies if you have already tried this.</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>Wes Hays</FONT></DIV> <DIV><FONT color=#000000 size=2>N6372V</FONT></DIV> <DIV><FONT color=#000000 size=2>Rotan, TX</FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV></BODY></HTML> _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com
<<attachment: winmail.dat>>
