Author: johncclarkva@... Time: Sun Aug 21, 2005 4:37 am PDT Link
Hi Bruce, good question. It would also be interesting to know how many were
near the gross weight and with a forward CG. I would think that even within
the CG envelope, the mass above the nose gear could be important.
Of the 3 9As, two had subies and one had an O320
Of the 3 7As, two had subies and one had an O360
of the 3 8As, one had an O360, one a chevy, and one an O320
4 subies or 5 subies, see below
2 O360s
2 O320s
1 Chevy
The latest -7A at Beaumont KS was also a subie. I did not pick this one up
in the query.
The 8A numbers don't match my earlier posts, 3 instead of 5, I suspect that
the key words showed up twice in two of the files.
Regards, John.
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~-
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/RV-9A/
<*> To unsubscribe from this group, send an email to:
RV-9A-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: johncclarkva@... Time: Sun Aug 21, 2005 4:37 am PDT Link
Ok folks, more time to spare - too hot to work in the hangar. Besides, I
have just finished working off the FAA squawks on my -9A, made the cowl much
easier to remove and install, and will call the FAA Monday to hopefully get an
airworthiness certificate.
What we have been missing in this discussion is the exposure to accidents,
that is, how may RV taildraggers are there, how many A models, how long has
each model been in service?
For example, IF most of the 7s and 9s are A models, then anything that ends
up inverted is likely going to be an A model. Here are the numbers I found.
The data below with "Airplanes" in service, and those "inverted", flipped, or
nosed over, "ground loop" includes loss of directional control. I took out
the fatal because you can crash inverted, which is not the issue here. All of
these most likely had substantial damage or they don't get into the NTSB data
base.
For -6, 672 airplanes and 34 inverted, flipped, or nosed over, 16 ground loop
-6A, 642 airplanes and 33 inverted, 5 ground loop
About even for both
For -7, 57 airplanes and 0 inverted 0 ground loop
-7A, 98 airplanes and 3 inverted 0 ground loop
not a significant difference, one or two either way can even it up
For -8, 298 airplanes and 7 inverted, 5 ground loop
-8A, 84 airplanes and 5 inverted, 0 ground loop
may show some significance, not much though, again, one or two out of the -8A
and numbers would even up
For -9, 15 airplanes and 0 inverted, 0 ground loop
-9A, 107 airplanes and 3 inverted, 0 ground loop
the first -9 that goes inverted, and we can wait for 7 more -9As to even the
score, just kidding.
Also, the 6 and 6A have been around much longer so with 33 hits each, on
average 3 "inverted" a year (for 10 years, just a WAG by me, suggest a better
number of years if you will).
To me, it does not seem that 7, 8 and 9As are on pace to match the 6As.
Ground loops that cause substantial damage are a factor to consider, although it
may not be as significant as being inverted.
Too bad we can't get the number of hours flown, or number of flights, etc.
Also, I have no idea if the 6A gear is significantly different that the 7, 8
or 9A.
Right now, I don't see a significant difference between the models. Of
course, the situation may become much clearer as the number of RVs come into
service and the years add up.
Clearly, ditches and soft ground are a menace to the A models,as they are for
many of the certified airplanes. Also, engine problems, fuel starvation,
fuel exhaustion, etc are a significant factor that can be better controlled.
This was a very quick look, so there may be some glaring mistakes. Also,
there are some double counts in some cases where, for example, "flip" and
"inverted" both are in a file. Let me know if there are other ways to parse out the
numbers. Also, I would encourage you to go to the NTSB web site and use the
query system, read some of the reports (www.ntsb.gov, select AVIATION at the
top, select ACCIDENT DATA BASE at the top, select QUERY at the top) . The FAA
data base has the registration data, that is, the number of RVs registered.
With that said, practice the slow flight, spot landings, stick all the way
back, at least for the A models (I have minimum taildragger time).
I should have stayed at the hangar and finished my flight test cards.
Regards, John.
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~-
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/RV-9A/
<*> To unsubscribe from this group, send an email to:
RV-9A-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: bobdeva@... Time: Sun Aug 21, 2005 6:20 pm PDT Link
John
My opinion is that your next to the last sentence says it all. KEEP THE STICK
BACK! I've seen collapsed nose gears on almost every plane flown and other
than a few where a bolt in a downlock link was lost, they were caused by pilot
error. Ask any flight school owner. Made to be used, but not abused!
Nose draggers are designed to be landed on the mains and taxied with the
wheel/stick back when on anything other than a smooth taxiway. I personally think
it's a good idea to keep it back all the time. Less chance of getting a stone
nick on your prop. Good practice. (The above does not apply to carrier
landings/arrivals)
Bob D
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~-
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/RV-9A/
<*> To unsubscribe from this group, send an email to:
RV-9A-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/