Today's Message Index:
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1. 03:51 AM - Re: Altitude/speed control on approach (Ducati SS)
2. 08:29 AM - Re: FireFly Wing Brace Repair (Jack B. Hart)
3. 08:37 AM - Re: Firefly wing brace repair. (william sullivan)
4. 08:55 AM - Re: FireFly Wing Brace Repair (John Hauck)
5. 11:42 AM - Re: Looking for MKIIIC cage; airworthy or not. (Kirkds)
6. 08:00 PM - Re: FireFly Wing Brace Repair (Ron @ KFHU)
Message 1
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Subject: | Re: Altitude/speed control on approach |
The technique described is not really reversing anything, the airplane does not
know if it is at 500 or 5000 ft. If you are flying along in a Cessna trimmed
for hands off at 2000 rpm and 90mph and increase rpm to 2400 you will not go any
faster, you will climb at 90mph. If you pull the power to idle ( again without
touching the yoke ) you will descend at 90mph.With the same 2,000 rpm 90mph
trim you can pull back on the yoke and climb but you will lose airspeed. The
problem with using pitch to control alt. on final is the constant change in airspeed,
not so good when you are all ready close to stall speed. Trimming for
approach speed and using power to control decent keeps the airspeed stable. Of
course bumpy air or changes in lift/drag ( such as lowering flaps) may very
well require pitch changes. Hard to prove in a Firefly with no pitch trim and
the resulting unintentional pitch changes.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366182#366182
Message 2
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Subject: | FireFly Wing Brace Repair |
At 02:11 PM 2/12/12 -0600, you wrote:
>
>Jack H/Kolbers:
>
>Believe that is a fabric brace that does its job in tension. As the fabric
>is shrunk it prevents the outboard aft corner of the rear wing spar in line
>and not pushed backwards.
>
John,
I am confused. If shrinking the fabric tries to pull the rear spar forward
toward the wing leading edge, anything that prevents this is in compression.
It would seem logical that if the shrunk fabric is pulling the rear spar
forward and inward from the wing end bow. To prevent this from happening
something has to push back at the corner to prevent this from happening.
What am I missing here?
Your concept is not supported by what I found.
Jack B. Hart FF004
Winchester, IN
Message 3
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Subject: | Re: Firefly wing brace repair. |
- On my original Firestar, the original wings had been damaged in a storm
rollover.- When I opened them up, there was no sign of damage in that ar
ea.- Where the braces crossed, the builder had placed a small block of st
yrofoam and cross wired it in place.- Whoever built it, the construction
seemed to be very meticulous.
-------------------------
----------------------- Bill
Sullivan
-------------------------
----------------------- Winds
or Locks, Ct.
-------------------------
----------------------- FS 44
7
Message 4
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Subject: | FireFly Wing Brace Repair |
I am confused. If shrinking the fabric tries to pull the rear spar forward
toward the wing leading edge, anything that prevents this is in compression.
It would seem logical that if the shrunk fabric is pulling the rear spar
forward and inward from the wing end bow. To prevent this from happening
something has to push back at the corner to prevent this from happening.
What am I missing here?
Your concept is not supported by what I found.
Jack B. Hart FF004
Winchester, IN
Perhaps Dennis Souder can explain this much better than I can. He or Homer
Kolb explained it to me.
I think the fabric is actually trying to squeeze the bow tip area of the
wing into an oblong shape since the sides of the bow tip area are not
equidistant.
It is the rounded curve of the bow tip that encourages the aft outboard
corner of the wing to be push backwards as fabric is shrunk. If there was a
strong compression brace installed at a 45 degree angle from the center of
the bow tip curve back to the main spar, this would help prevent the
problem. I have those 45 degree bow tip braces installed on my MKIII.
The problem may not be as pronounced with the small curve of the FF and SS
bow tip as it is with the US, FS, MKIII, and Kolbra, which uses a much
larger curve.
This very small 5/16" tube brace was never intended for compression. If it
was, it would have been a much larger, more substantial brace.
This little 5/6" brace may also act as a drag brace, since there is no other
bracing in the bow tip to prevent the wind stream from pushing aft on it.
Figuring out how to sequentially shrink the bow tip fabric to reduce this
tendency may help. My primary concern when I shrink wing fabric is to get
that fabric as tight as I can without distorting the wing, not necessarily
what is happening out on the bow tip. I build for performance.
Sorry if this explanation doesn't do the job. This is day 5 of the dreaded
virus. That's my excuse and I'm sticking to it. ;-)
Maybe someone else that understands what is happening can explain the
situation better than I can.
john h
mkIII
Titus, Alabama
Message 5
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Subject: | Re: Looking for MKIIIC cage; airworthy or not. |
Who called me on the Mark 3 kit I'm selling?
--------
Kirk Smith
Columbiaville, MI
Firestar II
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366226#366226
Message 6
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From: | "Ron @ KFHU" <captainron1@cox.net> |
Subject: | Re: FireFly Wing Brace Repair |
Jack this is an excellent post, and a good repair. Appreciate it.
Ron Mason
KFHU
M3X
============================
---- "Jack B. Hart" <jbhart@onlyinternet.net> wrote:
============
FireFlyers,
This is a little late but it may still be of some use especially to those
who are in the building process. Back on November 9, 2010 I was cleaning
the wings when I discovered a rattle in the outboard portion of the wings.
I was in the process of mounting the MZ 34 and so I didn't put the knife to
the wing fabric until March 17, 2011.
What I found was that the long diagonal brace from the outboard rear corner
to the main spar had failed in each wing. I do not believe these to be
really critical because the load that the outer wing panel carries is quite
small. But because it is there, I repaired it. Finished the repairs on
July 13, 2011.
I took quite a few photos, and I put them up with some description of how I
fixed the problem. It can be seen at:
http://jackbhart.com/firefly/firefly164.html
For those of you who have a FireFly under construction, it may be helpful to
add a small aluminum angle to this brace to prevent the tube from going out
of column when you shrink the wing fabric.
Jack B. Hart FF004
Winchester, IN
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