Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

RV-9A CG change

Matronics Email Lists Forum Index -> RV-List

View previous topic :: View next topic

Author Message

dcr(at)fdltownhomes.com
Guest

Posted: Sun Dec 30, 2007 6:35 pm Post subject: RV-9A CG change

Guys:  Today I begin the ugly task of moving my 10 pound battery from the firewall to behind the baggage compartment.  I have an 0-360A4M with a Van’s fixed pitched Sensenich prop and a nose wheel empty weight of 288 pounds.  After reading Van’s info indicating 315 is the maximum allowable, I decided to bite the bullet and move the battery aft.  My figuring indicates that the battery movement will take 25 pounds off the nose wheel and move the empty CG aft 11/2 inches.  My empty CG now is 76.05 at 1146 pounds and my most aft min fuel CG is 82.04 at max gross of 1750.  Anyone see something I don’t see.  Dan,  N65XX with 130 hours.  

        [quote][b]

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

ronlee(at)pcisys.net
Guest

Posted: Sun Dec 30, 2007 8:54 pm Post subject: RV-9A CG change

First...you are already 27 pounds under the max.  Are you certain that  you have a problem

 that requires moving the battery aft?

  

  

 [quote]   ---

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

Jim Ellis

Joined: 26 Jan 2006
Posts: 11

Posted: Mon Dec 31, 2007 8:22 pm Post subject: Re: RV-9A CG change

Dan,

I just went through a similar exercise with my 9A.  The best place to start is to weigh the plane with full fuel tanks.  In my case the nose wheel weight was 361 pounds with full fuel.  I have an O-360 and the same prop you are using.  If I read it correctly Vans info shows that the maximum nose gear weight is 325 pounds, not 315.



I thought about moving the battery from the firewall to behind the baggage compartment but the weight of the battery (16 pounds) and the moment arm (about 160 inches) didn't bring the nose gear weight down to 325 pounds.  I had to add 20 pounds of ballast under the empennage fairing (arm 208 inches).  This produced a measured nose wheel weight of 322 pounds, again with full fuel.  The final empty C.G. with ballast ended up at 79.11 inches.



Hope this helps.



Jim Ellis

RV-9A, flying

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV-List

Display posts from previous:

	Matronics Email Lists Forum Index -> RV-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum