-----Original Message-----
From: Ryan [mailto:rr...@san.rr.com]
Sent: Wednesday, August 25, 2021 7:27 PM
To: 'KRnet'
Subject: RE: KR>Re: KR flight characteristics
Larry and group,
I just purchased this KR 2 months ago. It is old with a 2100cc Revmaster with
CDI ignition.
Anyone weighing around 200# or less can get some stick time with me by Texting
me with their name.
I am at KSDM Brown Field airport in San Diego, CA.
I am working on ergonomics now for comfort, seating, controls and CG issues
that have made it more comfortable for me.
Ryan
N81BP KR-2 Tri-Gear
Text me any time 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
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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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