RV-9A's wing with Rotax 914?

After control system theory in engineering school and designing PID
systems for work I know what stability means, but thanks for the links
anyway. I wasn't talking about the engineering definition, I was
referring to what lay people usually refer to as a feeling they call
"stability". I didn't want to bore people defining terms when we're
really talking about how something feels to a pilot.

"nauga" wrote in message thlink.net...
Kevin Horton wrote...
It is not possible to have a productive discussion
when one party does not understand the terminology used.

My hovercraft is full of eels.
Dave 'tobacconist' Hyde


??? 'tobacconist' think you misspelt 'obfuscationist'?

Sydney

Jay wrote...

I wasn't talking about the engineering definition, I was
referring to what lay people usually refer to as a feeling they call
"stability". I didn't want to bore people defining terms when we're
really talking about how something feels to a pilot.

Regardless of how you intended to refer to it,
more area in front of the CG will reduce both the
stick force per g and the stick force per unit
airspeed deviation. Both of these effects are
detrimental to handling in IMC (for an airplane
that's originally suited for it), and neither
are effected by the mass distribution other than
the effect that distribution has on CG. Inertia
doesn't enter into the picture in these effects.

What _hasn't_ been said here is that if you
add more aerodynamic are in front you can compensate
by moving the CG forward, but (a) that's not always
easy, and (b) you then effectively lengthen the
tail arm, which has a similar effect on handling.

Dave 'TANSTAAFL' Hyde

Kevin

Read where Canada may close Goose Bay, 'Bag' Town and others. Looks
like your Political's will strip you like ours have/did.

Big John

On Fri, 05 Mar 2004 13:24:05 -0800, Jay wrote:

After control system theory in engineering school and designing PID
systems for work I know what stability means, but thanks for the links
anyway. I wasn't talking about the engineering definition, I was
referring to what lay people usually refer to as a feeling they call
"stability". I didn't want to bore people defining terms when we're
really talking about how something feels to a pilot.

OK, if you don't want to talk about stability, try to find some other
words to describe what you want to say. Otherwise if what you are trying
to mean doesn't match the words you use it is like trying to have a
discussion with my wife when she gets in one of those moods. It ends up
with a lot of words being said, but no communication occurring.

There is a very good relationship between quantitative measures of
stability and how the aircraft will "feel" to the pilot. Adding area
forward to accommodate a lighter engine on a longer engine mount will make
the aircraft a worse IFR platform, as there will be less of a tendency
for the aircraft to return to the trimmed condition if it is disturbed in
pitch or yaw. There will also be lower stick force cues if you get off
the trimmed speed, which will increase the workload when trying to fly a
desired speed, like when you are on final approach.

--
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://go.phpwebhosting.com/~khorton/rv8/
e-mail: khorton02(_at_)rogers(_dot_)com

Jay wrote:

After control system theory in engineering school and designing PID
systems for work I know what stability means, but thanks for the links
anyway. I wasn't talking about the engineering definition, I was
referring to what lay people usually refer to as a feeling they call
"stability". I didn't want to bore people defining terms when we're
really talking about how something feels to a pilot.

This IS a fairly technical forum.

What the great unwashed masses think about aerodynamic stability
would probably confuse me badly...

Richard

Kevin

Do you think my wife and yours came from the same family tree?

BJ

On Sat, 06 Mar 2004 03:12:07 GMT, Kevin Horton wrote:

----clip----

----clip---- Otherwise if what you are trying
to mean doesn't match the words you use it is like trying to have a
discussion with my wife when she gets in one of those moods. It ends up
with a lot of words being said, but no communication occurring.

----clip----