Today's Message Index:
----------------------
1. 03:36 PM - Re: High speed taxi tests: good or bad idea? (ronlee)
2. 05:40 PM - Re: Re: High speed taxi tests: good or bad idea? (rayj)
3. 06:33 PM - Re: Re: High speed taxi tests: good or bad idea? (n801bh@netzero.com)
4. 07:53 PM - Re: Re: High speed taxi tests: good or bad idea? (fritz)
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| Subject: | Re: High speed taxi tests: good or bad idea? |
I guess I didn't make my message clear about taxing with the nose wheel up. As
someone else noted the nose will come up VERY easily and at a low speed, if not
careful one can even scrape the tail tie down. It seems at some point it (the
tail) just wants to keep going down. My experience is coming down from such
a nose high taxi is touchy to bring it down gently. My thoughts are that once
the air starts going through the slats (nose high) the tail just wants to keep
going down. Now here is my point, if you get airborne with the nose high and
you don't want to fly, but bring it back down to the runway gently is where the
problem can be. It's easy to come down much faster then you want and easy to
thump it , especially if the end of the runway is approaching.
I've taxied both ways, slats on and slats off with VGs and can definitely state
that taxing with the nose wheel an EVEN distance (6 inches, 10 inches etc) off
the ground is way easier done without the slats on. I can only theorize why
this is so. Maybe someone has right answer.
--------
Ron Lee
Tucson, Arizona
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=314426#314426
Message 2
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| Subject: | Re: High speed taxi tests: good or bad idea? |
It seems to me that the location of the center of gravity relative to
the wheel axles would be a significant factor. Perhaps the CG moves
from in front of the axles to behind at some point while the nose is
moving up. If the CG moved across the fulcrum, the tail would want to
go all the way to the ground.
Just a thought.
Raymond Julian
Kettle River, MN
On 10/02/2010 05:34 PM, ronlee wrote:
> --> Zenith701801-List message posted by: "ronlee"<rlee468@comcast.net>
>
> I guess I didn't make my message clear about taxing with the nose wheel up. As
someone else noted the nose will come up VERY easily and at a low speed, if
not careful one can even scrape the tail tie down. It seems at some point it (the
tail) just wants to keep going down. My experience is coming down from such
a nose high taxi is touchy to bring it down gently. My thoughts are that once
the air starts going through the slats (nose high) the tail just wants to keep
going down. Now here is my point, if you get airborne with the nose high and
you don't want to fly, but bring it back down to the runway gently is where
the problem can be. It's easy to come down much faster then you want and easy
to thump it , especially if the end of the runway is approaching.
> I've taxied both ways, slats on and slats off with VGs and can definitely state
that taxing with the nose wheel an EVEN distance (6 inches, 10 inches etc)
off the ground is way easier done without the slats on. I can only theorize why
this is so. Maybe someone has right answer.
>
> --------
> Ron Lee
> Tucson, Arizona
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=314426#314426
>
>
Message 3
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| Subject: | Re: High speed taxi tests: good or bad idea? |
Here is may take on the 701/801 flying habits.
A slatted wing will behave predictably till you hit the critical angle o
f attack. Then the slats start to 'breath' and funnel air over the top s
urface of the wing. At that point the plane gets twitchy and wants to fl
y at an accellerated rate and pitch movements through the controls will
be laser precise. If you over correct and get the plane leveled off too
quickly the reverse happens and the wing quits flying and the nose will
drop. This all happens in a very narrow speed range which just happens t
o present itself when fast taxiing at just under flying speed. The 701/
801 design is different then in any other plane in that at rotation it
either wants to jump in the air with a positive rate of climb or linger
at a wings level attitude if you don't rotate properly. It is not danger
ous,,,,,, just real different then any other plane you will ever fly.
Just my humble opinion after flying my 801 for 400 hours...... I LOVE my
801 !!!!!!!!!!!!!!
Ben.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
---------- Original Message ----------
From: rayj <raymondj@frontiernet.net>
Subject: Re: Zenith701801-List: Re: High speed taxi tests: good or bad i
dea?
It seems to me that the location of the center of gravity relative to
the wheel axles would be a significant factor. Perhaps the CG moves
from in front of the axles to behind at some point while the nose is
moving up. If the CG moved across the fulcrum, the tail would want to
go all the way to the ground.
Just a thought.
Raymond Julian
Kettle River, MN
On 10/02/2010 05:34 PM, ronlee wrote:
> --> Zenith701801-List message posted by: "ronlee"<rlee468@comcast.net
>
>
> I guess I didn't make my message clear about taxing with the nose whee
l up. As someone else noted the nose will come up VERY easily and at a l
ow speed, if not careful one can even scrape the tail tie down. It seems
at some point it (the tail) just wants to keep going down. My experienc
e is coming down from such a nose high taxi is touchy to bring it down g
ently. My thoughts are that once the air starts going through the slats
(nose high) the tail just wants to keep going down. Now here is my point
, if you get airborne with the nose high and you don't want to fly, but
bring it back down to the runway gently is where the problem can be. It'
s easy to come down much faster then you want and easy to thump it , esp
ecially if the end of the runway is approaching.
> I've taxied both ways, slats on and slats off with VGs and can definit
ely state that taxing with the nose wheel an EVEN distance (6 inches, 1
0 inches etc) off the ground is way easier done without the slats on. I
can only theorize why this is so. Maybe someone has right answer.
>
> --------
> Ron Lee
> Tucson, Arizona
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=314426#314426
>
>
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Message 4
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| Subject: | Re: High speed taxi tests: good or bad idea? |
we must also remember that the 701, 750, 801 horiz. tail airfoil is a
lot different than most other airplanes, the airflow over the tail
helps to keep the nose high angle. too much power and oops, not
enough power oops.
Fritz----- do not archive
----- Original Message -----
From: n801bh@netzero.com
To: zenith701801-list@matronics.com
Sent: Saturday, October 02, 2010 9:24 PM
Subject: Re: Zenith701801-List: Re: High speed taxi tests: good or bad
idea?
Here is may take on the 701/801 flying habits.
A slatted wing will behave predictably till you hit the critical angle
of attack. Then the slats start to 'breath' and funnel air over the top
surface of the wing. At that point the plane gets twitchy and wants to
fly at an accellerated rate and pitch movements through the controls
will be laser precise. If you over correct and get the plane leveled off
too quickly the reverse happens and the wing quits flying and the nose
will drop. This all happens in a very narrow speed range which just
happens to present itself when fast taxiing at just under flying speed.
The 701/801 design is different then in any other plane in that at
rotation it either wants to jump in the air with a positive rate of
climb or linger at a wings level attitude if you don't rotate properly.
It is not dangerous,,,,,, just real different then any other plane you
will ever fly.
Just my humble opinion after flying my 801 for 400 hours...... I LOVE
my 801 !!!!!!!!!!!!!!
Ben.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
---------- Original Message ----------
From: rayj <raymondj@frontiernet.net>
To: zenith701801-list@matronics.com
Subject: Re: Zenith701801-List: Re: High speed taxi tests: good or bad
idea?
Date: Sat, 02 Oct 2010 19:37:09 -0500
<raymondj@frontiernet.net>
It seems to me that the location of the center of gravity relative to
the wheel axles would be a significant factor. Perhaps the CG moves
from in front of the axles to behind at some point while the nose is
moving up. If the CG moved across the fulcrum, the tail would want to
go all the way to the ground.
Just a thought.
Raymond Julian
Kettle River, MN
On 10/02/2010 05:34 PM, ronlee wrote:
> --> Zenith701801-List message posted by:
"ronlee"<rlee468@comcast.net>
>
> I guess I didn't make my message clear about taxing with the nose
wheel up. As someone else noted the nose will come up VERY easily and at
a low speed, if not careful one can even scrape the tail tie down. It
seems at some point it (the tail) just wants to keep going down. My
experience is coming down from such a nose high taxi is touchy to bring
it down gently. My thoughts are that once the air starts going through
the slats (nose high) the tail just wants to keep going down. Now here
is my point, if you get airborne with the nose high and you don't want
to fly, but bring it back down to the runway gently is where the problem
can be. It's easy to come down much faster then you want and easy to
thump it , especially if the end of the runway is approaching.
> I've taxied both ways, slats on and slats off with VGs and can
definitely state that taxing with the nose wheel an EVEN distance (6
inches, 10 inches etc) off the ground is way easier done without the
slats on. I can only theorize why this is so. Maybe someone has right
answer.
>
> --------
> Ron Lee
> Tucson, Arizona
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=314426#314426
>
>
>
>
>
>
>
____________________________________________________________
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Online site promises to sell 1,000 46" LED TV's for only $98.76 each!
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