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C of G range

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sprocket(at)vx-aviation.c
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Posted: Fri Jun 21, 2013 6:25 pm Post subject: C of G range

What is the official c of g range for the  HR-II?

 The RV-4 range is 15 to 30 percent of MAC  (8.7 to 17.4 inches aft of leading edge), but I have seen other numbers for the  HR-II.

  

 Thanks,  Vern

   [quote][b]

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viperpilot

Joined: 28 Aug 2012
Posts: 11
Location: Peachtree City, GA

Posted: Sun Jun 23, 2013 8:05 am Post subject: Re: C of G range

The latest information I have is a CG range of 86.7 inches to 97.4 inches aft of the "Datum".  The "Datum" is 80.0 inches forward of the wing leading edge.  Source of the information is John Harmon at harmonrocket(at)aol.com .  Hope that helps.  Feel free to email me at viperplt(at)comcast.net if you have any further questions.



Tailwinds,

Randy Sage

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sprocket(at)vx-aviation.c
Guest

Posted: Sun Jun 23, 2013 10:16 am Post subject: C of G range

Hi Randy, thanks for this.

My research has shown that the RV-4 wing uses 15-30 percent MAC which is 

88.7 to 97.4 inches aft of datum.

I've seen the 86.7 and 87.7 forward limit in some F1 cases (larger tail), 

but this is quite an outlier.  Virtually all loading cases can fit within 

the 88.7 limit (155 lb pilot, zero fuel is at the limit in my case).  Note 

that fuel moment arm is AFT of the forward limit, so the C of G moves 

forward as fuel is burned in this scenario!



The only traceable engineering source is the RV-4 manual and I'm happy with 

the choice off 88.7 for the forward limit.  Everyone agrees on the aft 

limit!



Thanks again for the feedback,

Vern



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nrsage86(at)comcast.net
Guest

Posted: Mon Jun 24, 2013 6:23 am Post subject: C of G range

Vern,



Glad to help.  Good luck on getting her airborne.  Fly Safe!



Randy

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sprocket(at)vx-aviation.c
Guest

Posted: Mon Jun 24, 2013 4:10 pm Post subject: C of G range

First engine start was today, no problem except for the prop governor 

working in reverse (sigh).



Thanks, V



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rktman64(at)gmail.com
Guest

Posted: Mon Jun 24, 2013 6:10 pm Post subject: C of G range

Congratulations Vern!



Thanks,



Kevin



On Jun 24, 2013, at 5:13 PM, "Vern Little" <sprocket(at)vx-aviation.com> wrote:



[quote] 

 

 First engine start was today, no problem except for the prop governor working in reverse (sigh).

 

 Thanks, V

 

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