Today's Message Index:
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1. 09:59 AM - Re: FireFly Weight and Balance (Eugene Zimmerman)
2. 10:57 AM - Re: Re: FireFly Weight and Balance (John Hauck)
Message 1
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Subject: | Re: FireFly Weight and Balance |
Concern about CG limits on any Kolb aircraft is for all practical purposes unnecessary
unless there is a significant deviation from, or modification of, the
airframe from the original Kolb design plans.
The best way to optimize the CG on any Kolb airplane is to test fly the airplane
and trim the control surfaces to fly hands off straight and level. Modifying
a Kolb aircraft's CG is beneficial only for the purposes of minimizing significant
control surface deflection necessary for neutral-hands off straight and
level flight.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491047#491047
Message 2
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Subject: | Re: FireFly Weight and Balance |
I agree with Gene Zimmerman. I've built 3 Kolbs, US, FS, and MKIII. Never did
a weight and balance on the US and FS. Test flew it, added a trim tab to aileron,
elevator, and rudder. Trimmed and test flew for best cruise flight.
My MKIII has aft CG on paper. Flies neutral with no pitch trim at glide, idle
rpm. Bring up the power and it takes a lot of nose up pitch trim to fly neutral.
That doesn't sound like aft cg.
Pushers with high thrust line like the FS and MKIII have significant pitch change
from idle to cruise power or full power. Lots of Kolbers don't recognize this,
thinking something is wrong with their airplanes.
Build it according to plans and it will be within cg limits.
I have made significant modifications to all my Kolbs and never experienced a cg
problem, never had to add 40 lbs of lead to the nose cone, etc.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@matronics.com] On Behalf Of Eugene Zimmerman
Sent: Sunday, August 25, 2019 11:59 AM
Subject: Kolb-List: Re: FireFly Weight and Balance
Concern about CG limits on any Kolb aircraft is for all practical purposes unnecessary
unless there is a significant deviation from, or modification of, the
airframe from the original Kolb design plans.
The best way to optimize the CG on any Kolb airplane is to test fly the airplane
and trim the control surfaces to fly hands off straight and level. Modifying
a Kolb aircraft's CG is beneficial only for the purposes of minimizing significant
control surface deflection necessary for neutral-hands off straight and
level flight.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491047#491047
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