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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Sun Jan 25, 2009 6:23 am Post subject: Another flying adventure/"Ski tuck" |
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Well, now I find that the FAA has an official name for what happened
to me yesterday...it is called "ski tuck". I found a reference to ski
tuck in publication "FAA-H-8083-3" It says in part "....when skis
are not rigged properly, or when a pilot exceeds recommended
airspeeds, that a ski will tuck down and give a momentary downward
rotation of the nose of the aircraft. This is generally caused by
spring or bungie (their spelling, not mine) tension not being
sufficient to hold ski tips up. The pitching and yawing will get your
undivided attention." To that last sentence I give a big AMEN!
They go on to say ".....reduce power and reduce the speed of the
aircraft. When the air loads are decreased below the tension of the
spring or bungie, the ski will pitch back up into place and the
control problem will go away. The proper fix is to get a maintenance
shop to correctly adjust the spring or bungie tension and then not
exceed the speed limits on the skis."
That last sentence reminds me that I must get ahold of the dim bulb
that built these skis and slap him about the head a bit and get him
to issue a speed limit for these new skis, and to get him to issue a
new tension tolerance for the "bungies"....damned experimenters, anyway!
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 600.2 hrs
Sensenich 62x46
Electroair direct-fire ignition system
New skis done and flying
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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akflyer
Joined: 07 May 2007
Posts: 574
Location: Soldotna AK
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| Posted: Sun Jan 25, 2009 6:57 am Post subject: Re: Another flying adventure/ |
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You are not going to get you fox going too fast for the skis unless you are in a power dive. Just tighten the bungee and have fun playing in the snow.
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
DO NOT ARCHIVE
Leonard Perry aka SNAKE
Soldotna AK
Avid "C" / Mk IV
582 (147 hrs and counting on the rebuild)
IVO IFA
Full Lotus 1450
#1 snake oil salesman since 1-22-2009
I would rather die trying to live, than to live trying not to die.... |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Sun Jan 25, 2009 9:45 am Post subject: Another flying adventure/"Ski tuck" |
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Earlier I mentioned FAA publication #FAA-H-8083-3. Another source
for more extensive information on ski and float-equipped airplanes
(and choppers) can be found in FAA-H-8083-23, which finally surfaced
when I cleaned up the "publication area"...that area of my floor
where the publications all drop from my hands when I fall asleep
while reading them.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 600.2 hrs
Sensenich 62x46
Electroair direct-fire ignition system
New skis done and flying
On Jan 25, 2009, at 9:21 AM, Lynn Matteson wrote:
| Quote: |
Well, now I find that the FAA has an official name for what
happened to me yesterday...it is called "ski tuck". I found a
reference to ski tuck in publication "FAA-H-8083-3" It says in
part "....when skis are not rigged properly, or when a pilot
exceeds recommended airspeeds, that a ski will tuck down and give a
momentary downward rotation of the nose of the aircraft. This is
generally caused by spring or bungie (their spelling, not mine)
tension not being sufficient to hold ski tips up. The pitching and
yawing will get your undivided attention." To that last
sentence I give a big AMEN!
They go on to say ".....reduce power and reduce the speed of the
aircraft. When the air loads are decreased below the tension of the
spring or bungie, the ski will pitch back up into place and the
control problem will go away. The proper fix is to get a
maintenance shop to correctly adjust the spring or bungie tension
and then not exceed the speed limits on the skis."
That last sentence reminds me that I must get ahold of the dim bulb
that built these skis and slap him about the head a bit and get him
to issue a speed limit for these new skis, and to get him to issue
a new tension tolerance for the "bungies"....damned experimenters,
anyway!
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 600.2 hrs
Sensenich 62x46
Electroair direct-fire ignition system
New skis done and flying
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| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Sun Jan 25, 2009 10:09 am Post subject: Another flying adventure/"Ski tuck" |
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At the risk of annoying those that count posts, I feel I should set
the record straight on two matters. The latest publication of the two
I mentioned, FAA-H-8083-23, published in 2004, says in the Preface:
"This handbook supercedes (sic) Chapters 16 and 17 of FAA_H_8083-3,
Airplane Flying Handbook, dated 1999. This handbook is available for
download from the Flight Standards Service Web site at http://av-
info.faa.gov. This Web site also provides information about
availability of printed copies."
This is important stuff because the latest publication now apparently
accepts the spelling "bungee" as superseding the former spelling of
"bungie," as found in the earlier publication. They still need to
work on "supersedes"
Kidding aside, the newest publication is very informative on matters
pertaining to ski flying, from this rookies' view, and they've got me
reassured that my "ski tuck" was not an unusual happening.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 600.2 hrs
Sensenich 62x46
Electroair direct-fire ignition system
New skis done and flying
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Jan 26, 2009 8:14 am Post subject: Another flying adventure/"Ski tuck" |
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Thanks Lynn I just went to the FAA site and downloaded quite a few
publications... After a quick browse I've seen most of it before but it's
always good to see things presented in a different manner.
Noel
--
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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