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601XL Near Perfect Flight

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davgray(at)sbcglobal.net
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Posted: Sun Sep 16, 2007 5:02 pm Post subject: 601XL Near Perfect Flight

I just finished a two hour flight of my local area,  landing at small airports that would have been difficult with my previous  aircraft.

 Winds variable at 4 kts, Visibility 50 miles,  Smooth air conditions.  It was very satisfying when everything in my  William Wynne Corvair powered 601XL was working perfectly.

 My last tweak was to eliminate a very small  vibration above 3000 rpm.  I did not experience any vibration  today.  A few strategically placed washers inside my spinner did the  trick so I will attach them permanently.

 I am very happy with this  machine.

 Now showing 55.3 hours Total Time

  

 Over the last year I have been chasing several  small problems.  So what did I learn if I was to do it again?

  

 For me I would have been much better off ordering  an engine from William Wynne and not listen to the local experts.  My  initial ignorance added to my build time and overall cost.  Virtually all  of the initial work had to be redone.

 Thanks to William Wynne I ended up with a very  good Corvair Conversion. 

  

 The Heintz Family is a pleasure to do business  with.  Nice design, good follow-up and building support.   

  

 I would not buy any used avionics.  The ones I  started with ended up weighing more, doing less, or costing more when I had  to replace them plus the time to re-wire the replacement.

  

 Keep it light, simple, documented and  organized.

  

  

 Now I plan on spending a lot more time in the  air.

 Keep building.  The end result is worth  it.

  

 Gary Ray

 Hanger E10 , (at) KPTK  SE Michigan

 davgray(at)sbcglobal.net (davgray(at)sbcglobal.net)

  

  

  

   [quote][b]

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craig(at)craigandjean.com
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Posted: Sun Sep 16, 2007 5:17 pm Post subject: 601XL Near Perfect Flight

Glad to hear you are  in the air and enjoying your plane.

  

 > A few strategically placed washers inside my spinner did the  trick so I will attach them  permanently.

  

 How did  you decide where to place the washers? I'm assuming you didn't have access to  dynamic balancing equipment.

  

 --  Craig

  

   [quote][b]

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davgray(at)sbcglobal.net
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Posted: Mon Sep 17, 2007 3:57 am Post subject: 601XL Near Perfect Flight

The following is how I understand it.  Either  I got lucky or I have it right.

 On the inside of my spinner I found a witness mark  that developed after the first 30 hours.  The mark is a dark powdered  area on the inner spinner near the bulkhead.  This implies that some  motion is occuring.  This forms when the bulkhead is deviating away from  the prop hub.  I reasoned that the side 90 degrees after the mark must  be heavy in order to cause the deflection.  Gyroscopes react 90 degrees  after the point where force is applied.  Since the heavy side can  not move into the prop hub there is no motion at that point.  However  the opposite side can experience a force away from the hub but the actual  movement outward would occur 90 degrees later.  As an example if you spin a  bicycle tire in a forward rotation, then tip the top of the tire to the  left, you will see that the front of the wheel also moves to the left (90  degrees later).  In my case I reasoned that the action of the front of the  wheel represents the point where I was seeing witness marks.  So adding  weight 90 degrees prior made sense.  This line of reasoning was then  confirmed on a static lawn mower balance.  I added duct tape to the inside  of the spinner with washers beneath as a trial and got an immediate  improvement.  

 The witness marks are an indication of dynamic  balance problems so as time goes on I will watch for any return of these  marks.

  

  

 [quote]   ---

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Tue Sep 18, 2007 4:46 pm Post subject: Re: 601XL Near Perfect Flight

 	  davgray(at)sbcglobal.net wrote: 	
		  For me I would have been much better off ordering  an engine from William Wynne and not listen to the local experts.  My  initial ignorance added to my build time and overall cost.  Virtually all of the initial work had to be redone.

	




If I may ask, what were some of the mistakes...?



I'm currently building a Corvair for the first time, so maybe I could learn something here.



Any advice or "gotchas" that can help us new guys out...?



Thanks,  



Patrick

601XL/Corvair

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davgray(at)sbcglobal.net
Guest

Posted: Wed Sep 19, 2007 5:02 am Post subject: 601XL Near Perfect Flight

Here are a few

    Paid for a total rework of the original heads where new valve seats were

secured by staking instead of the interference fit of Falcon.  Result was to

discard the heads and get a set from Falcon.

    Cylinder Honing that I was assured would be done in a compression jig to

avoid out of round condition when the cylinders are compressed during normal

operation after torqueing the heads.  Replaced these also.

    Replaced Crank for Nitrided Crank.  (original was done before it became

standard practice to use Nitrided only.)

    Connecting Rods reworked to unacceptable standards at the bearing

surfaces.

    Should have used the Marvel Schebler MA3-SPA that WW suggests as the

best choice. (would have saved 6 months of experimenting)

    I am not engine savy enough to have reliably discovered items like this

before learning the hard way.



Once again I have to thank William Wynne for everything he has done.

Confidence in my engine is much higher knowing that it has been worked on by

William's team.



Gary Ray



---

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craig(at)craigandjean.com
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Posted: Wed Sep 19, 2007 5:24 am Post subject: 601XL Near Perfect Flight

 	  Quote: 	
		   Should have used the Marvel Schebler MA3-SPA that WW suggests as the best

choice. (would have saved 6 months of experimenting)
	




What carb or carbs did you try before the Marvel?



-- Craig

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Wed Sep 19, 2007 6:16 am Post subject: Re: 601XL Near Perfect Flight

 	  davgray(at)sbcglobal.net wrote: 	
		  Here are a few 	




Thanks for sharing.  



I bet the overall project completion rate is increased considerably by the willingness of so many people on this list to share their experiences like this.  It sure helps me (and probably a whole bunch of other guys who are thinking about the same things).



Which will lead to more of us posting our own stories of Near Perfect Flight in the future...    



Patrick

601XL/Corvair

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