I had the battery mounted on the aft side of the seatback. I have put it back 
in its original position on the forward face of the firewall and it is more 
stable in pitch now.
I have moved the main gear axels forward 2 1/2" to reduce the load on the nose 
gear strut that had been overloaded in the past. That improved the static CG 
ground handling.

I am now offering stick time to KR enthusiast  and Young Eagles here at KSDM 
San Diego, CA.
Text me if would like to go for a free flight. Not over 180# or 5'11" tall.

N12KR , this is my new N number for the same KR2.

-----Original Message-----
From: Ryan [mailto:rr...@san.rr.com] 
Sent: Wednesday, August 25, 2021 7:54 PM
To: 'KRnet'
Subject: KR>Re: KR flight characteristics & W&B


I used a set of aircraft scales to do my Static W&B.
I made an aluminum plate bolted to the main gear leg with notches so I could 
adjust the location of the main axels forward 1/2" at a time until I got 15% 
the total aircraft and pilot weight on the nose wheel. All of this is with the 
longerons level.
The 12# battery was on the firewall in the engine compartment. Relocating it 
behind the seat improved the aerodynamic CG. My goal was to be at 25% chord or 
12" aft of the wing leading edge. My plans indicate that the firewall is at 
f.s. 30".

N81BP KR-2
Text 858-229-4875

-----Original Message-----
From: Flesner [mailto:fles...@frontier.com] 
Sent: Tuesday, August 24, 2021 4:31 PM
To: krnet@list.krnet.org
Subject: KR>Re: KR flight characteristics

On 8/24/2021 5:14 PM, Ryan wrote:
> My standard KR2 with Tri-Gear was pitch sensitive at 25% chord. I moved the 
> 12# battery behind the seatback to get 22% chord and now it is not pitch 
> sensitive with 1 person aboard. I have flown with 160# of ballast with a 
> similar result.
> Text me if you are in my area for some stick time. Copilot should be under 
> 200#.
> Ryan



Thanks for your post.  With your permission I will attempt to add some 
clarity to what you posted.

The plans call for a CG range of 15%-35% of chord, 8-16 inches aft of 
the wing center section lead edge.  You stated you were at 25% (12") and 
"move the battery behind behind the back seat".  We can only assume you 
meant "from behind the back set forward" and that put you at 22% 
(10.56").  Moving the CG forward would certainly improve pitch stability 
but it seems 1.44" is not significant enough to make a major 
improvement.  Can you give us an idea of how accurately your scales were 
and how close your measurements were?  What was the distance forward you 
moved the battery?  Is it again pitch sensitive with a passenger?  It 
seems a passenger would have moved the CG back at least to the 25% where 
it was once pitch sensitive.

Don't take my questions as disbelief in your results but as a means to 
determine accuracy so that others may benefit from your findings.  I 
know it has been stated hundreds of times but I'll repeat once more.  
For standard KR2's, stay out of the last 2" of the published CG range.

Ryan and others.  If you have info to share, my all means do so. Just 
try to be as thorough and as detailed as possible.  We'd like to hear 
from you.

For those attending the Gathering I'm scheduled to give a Power Point 
presentation on W&B.  We'll cover "what it is", "all the factors" , "why 
we care", and "how to determine the CG on YOUR airplane".

How many more days?

Larry Flesner
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