REFLECTOR: Weight & Balance

[nmflyer1 at aol.com]

John, 

I have 2 owner's manuals.(one came with the kit from Velocity, The other smaller version I purchased speerately, from velocity). .. There is only a one page 173 graph in each of them, There is a weight difference in them but no CG difference whatsoever, and no aimoints for the 173. 
There is no W&B on the 173 online manuals at all. 

Kurt 




-----Original Message-----
From: John Abraham <john at velocityaircraft.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Sun, Mar 23, 2014 7:06 pm
Subject: Re: REFLECTOR: Weight & Balance



The 173 is in the back of the owners manuals of the SE's. The 173 is about an inch farther back than the SE. Sumps would be the same though since they are the same fuselage. 


Farther aft you get the more pitch sensitive the plane will be. 

On Mar 23, 2014, at 8:47 PM, John Dibble <aminetech at bluefrog.com> wrote:



Through careful testing I determined that I could go a bit behind the recommended aft cg limit and still have the canard stall.

John

On 3/23/2014 3:55 PM, nmflyer1 at aol.com wrote:


What would be really nice is if there was something in print that stated what the real CG envelope is for the 173 FGE. Like I said, I could find no W&B info at all in the on line builder's manuals. All my manuals have examples/figures from the Standard. I think they are different. I do trust that Larry got the correct info from Scott, and would like to have it. 
 
I did notice that Larry's numbers and mine are really not very far off, Except: His shows an arm of the sump as 135" (which is in the book as an example of the standard. I noticed he subtracted it out of his empty CG numbers.) 
I weighed mine empty, then with just the sump tank full. It is 5 Gallons with a CG of 126.19. It is in the stock location. Pretty big difference there. 
 
One other wrench for my set-up is that My Pitot Tube sticks straight out of the nose. so the tip of the nose is no longer there. I kind of wagged on where it used to be, but I could be off by a bit. If this is so, my numbers get even closer to Larry's except for the sump. This would "buy" me back about 1/2" of CG to the good side. 

I already have 2 Batteries in the nose, but they are pretty lightweight. No room for another, but I am pretty sure I can get some more weight up there if I need to. How much does beer weigh? 
 
Wim is right on the fuel load effect on CG. I did a detailed fill & weigh process on mine and the basic arm of the fuel was within an inch the whole way, but that arm averaged about 123". This is important if the 173 numbers were really revised from 120.75" to 123. 
Would be nice to know what I am aiming for:0 
 
Thanks for the input all!  This is getting so close!
 
Kurt 








 

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