Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Bemused by W & B results

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Europa-List
View previous topic :: View next topic  
Author Message
JonathanMilbank



Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area

PostPosted: Fri Mar 10, 2017 3:08 pm    Post subject: Bemused by W & B results Reply with quote

Having just converted my Classic installation to Nev Eyre's improved version of the XS firewall forward and retaining the same 912ULS engine, I was nevertheless expecting a little weight increase and a noticeable forward movement of C of G. However my expectations were wrong (again) on both counts.

Exactly the same set of scales were used as for the previous weighing and as before the scales were accurately calibrated with weights made for the purpose. Also as before the fuselage was levelled by reference to the left door sill. The outcome is that the weight hasn't changed at all and the aircraft empty C of G has moved forward by only .03". Very strange!

How to account for this? These are the significant factors to my simple mind:

1) The cowls are about the same weight as before and Nev's extended and simplified engine bearer frame is not much heavier than the Classic's.

2) The longer starter motor which I have installed is certainly a couple of pounds heavier.

3) The new spinner and its backing plate are somewhat lighter.

4) No longer are the radiators and oil cooler with their fluids hanging at the front of the cowl, but are now beneath the engine and closer to the firewall.

5) Although I never weighed them, the Classic exhaust system was quite a lot heavier than the XS system.

6) The new 8.33 KHz radio is a little lighter FWIW.

7) No longer is there an air box plenum attached to the carburettors.

Having spelled out all of the above, I would really have expected the aircraft empty C of G to have moved forward by maybe 0.5". But I'm not complaining; just putting my observations out there for interest.


- The Matronics Europa-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?Europa-List
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Europa-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


Powered by phpBB © 2001, 2005 phpBB Group