Crash Data

[[email protected]]

This is according to the NTSB database and reflects helicopter crashes
between 1/1/1999 and 5/11/2004 for the helicopter models mentioned
only.

Helicopter Total Accidents Total Fatal Percent Fatal
=========== ================ =========== =============
Mini 500 7 2 28%
Robinson R22 178 30 17%
Brantly B2B 7 1 14%
Rotorway 48 2 4%
Safari 0 0 --
================================================== =======

Note that there are huge numbers of R22s and Rotorway helicopters out
there which account for the larger number of accidents. Not
surprising was the relatively few crashes of Mini500s, Brantlys and
Safaris because these helicopters are rare by comparison. There were
no reported crashes of Safari helicopters during that period and there
was only one prior to 1999. The Rotorway category also includes
Scorpion helicopters.

What this table shows is the percentage of fatalies to the total
number of crashes. From this data, we can conclude that if one is in
a crash, its better to be in a Rotorway. Although there is not enough
data to conclude this, it looks like the Safari may be better at not
having accidents in the first place.

There are two pieces of data that would be nice to have and those are
the mean number of hours between accidents and the mean number of
hours between fatalities. If anybody has this, please post it.

[Gig Giacona]

What this table will also not show are experimentals that, when registered,
were called something other than the name below. If I built a Safari I
could register it as a "Giacona Super Apache."


> wrote in message
...
>
> This is according to the NTSB database and reflects helicopter crashes
> between 1/1/1999 and 5/11/2004 for the helicopter models mentioned
> only.
>
> Helicopter Total Accidents Total Fatal Percent Fatal
> =========== ================ =========== =============
> Mini 500 7 2 28%
> Robinson R22 178 30 17%
> Brantly B2B 7 1 14%
> Rotorway 48 2 4%
> Safari 0 0 --
> ================================================== =======
>
> Note that there are huge numbers of R22s and Rotorway helicopters out
> there which account for the larger number of accidents. Not
> surprising was the relatively few crashes of Mini500s, Brantlys and
> Safaris because these helicopters are rare by comparison. There were
> no reported crashes of Safari helicopters during that period and there
> was only one prior to 1999. The Rotorway category also includes
> Scorpion helicopters.
>
> What this table shows is the percentage of fatalies to the total
> number of crashes. From this data, we can conclude that if one is in
> a crash, its better to be in a Rotorway. Although there is not enough
> data to conclude this, it looks like the Safari may be better at not
> having accidents in the first place.
>
> There are two pieces of data that would be nice to have and those are
> the mean number of hours between accidents and the mean number of
> hours between fatalities. If anybody has this, please post it.
>
>
>
>

[[email protected]]

That is probably true, but most of them put the real name in there
somewhere. There were 57 amateur built accidents in the specified
time frame. Only 2 were unrecognized. They are "Lewis Barnett J4B"
and "Seattle Aerotech Helipower 2500". These two could have been
anything, but are most likely non-kit homebuilts. The rest were
either Mini-500s or Rotorways.

Dennis.


"Gig Giacona" > wrote:

> What this table will also not show are experimentals that, when registered,
> were called something other than the name below. If I built a Safari I
> could register it as a "Giacona Super Apache."

Dennis Hawkins
n4mwd AT amsat DOT org (humans know what to do)

"A RECESSION is when you know somebody who is out of work.
A DEPRESSION is when YOU are out of work.
A RECOVERY is when all the H-1B's are out of work."

To find out what an H-1B is and how Congress is using
them to put Americans out of work, visit the following
web site and click on the "Exporting America" CNN news
video: http://zazona.com/ShameH1B/MediaClips.htm

[me]

wrote:

> This is according to the NTSB database and reflects helicopter crashes
> between 1/1/1999 and 5/11/2004 for the helicopter models mentioned
> only.
>
> Helicopter Total Accidents Total Fatal Percent Fatal
> =========== ================ =========== =============
> Mini 500 7 2 28%
> Robinson R22 178 30 17%
> Brantly B2B 7 1 14%
> Rotorway 48 2 4%
> Safari 0 0 --
> ================================================== =======
>
>

These figures should also show total number of each built then a
percentage of accidents and percentage in which were fatal. Total hours
might also have to be included.

Using the above only shows one point of view and not an overall picture.

Its like saying that there has been one accident with Concord - that's
one fatal so its 100% fatal crash rate. Gee wouldn't travel in that!









Note that there are huge numbers of R22s and Rotorway helicopters out
> there which account for the larger number of accidents. Not
> surprising was the relatively few crashes of Mini500s, Brantlys and
> Safaris because these helicopters are rare by comparison. There were
> no reported crashes of Safari helicopters during that period and there
> was only one prior to 1999. The Rotorway category also includes
> Scorpion helicopters.
>
> What this table shows is the percentage of fatalies to the total
> number of crashes. From this data, we can conclude that if one is in
> a crash, its better to be in a Rotorway. Although there is not enough
> data to conclude this, it looks like the Safari may be better at not
> having accidents in the first place.
>
> There are two pieces of data that would be nice to have and those are
> the mean number of hours between accidents and the mean number of
> hours between fatalities. If anybody has this, please post it.
>
>
>
>

[Rich]

.....FYI---

Anyone looking at this should be very carefull drawing conclusions.
The main piece of data missing is the total number of hours flown in
each make....without this a "fair" comparison can't be made...this is
basic statistics...can't calculate a batting average without knowing
how many times a player has been at bat...The NTSB website
"normalizes" accident data with hours flown(actually, accidents per x
number of hours). In simple terms..the denominator is missing....this
is a raw count of accidents...

...my 2 cents...have a little practice crunching these kinds of
statistics..
Rich


wrote in message >...
> This is according to the NTSB database and reflects helicopter crashes
> between 1/1/1999 and 5/11/2004 for the helicopter models mentioned
> only.
>
> Helicopter Total Accidents Total Fatal Percent Fatal
> =========== ================ =========== =============
> Mini 500 7 2 28%
> Robinson R22 178 30 17%
> Brantly B2B 7 1 14%
> Rotorway 48 2 4%
> Safari 0 0 --
> ================================================== =======
>
> Note that there are huge numbers of R22s and Rotorway helicopters out
> there which account for the larger number of accidents. Not
> surprising was the relatively few crashes of Mini500s, Brantlys and
> Safaris because these helicopters are rare by comparison. There were
> no reported crashes of Safari helicopters during that period and there
> was only one prior to 1999. The Rotorway category also includes
> Scorpion helicopters.
>
> What this table shows is the percentage of fatalies to the total
> number of crashes. From this data, we can conclude that if one is in
> a crash, its better to be in a Rotorway. Although there is not enough
> data to conclude this, it looks like the Safari may be better at not
> having accidents in the first place.
>
> There are two pieces of data that would be nice to have and those are
> the mean number of hours between accidents and the mean number of
> hours between fatalities. If anybody has this, please post it.

[[email protected]]

(Rich) wrote:

> number of hours). In simple terms..the denominator is missing....this
> is a raw count of accidents...

So where do we get those numbers from? We need the total number hour
hours for each make. This may be hard to come by. Is there any
database with this info?

The only thing the data so far provided says, is that if you are in a
crash in this type of helicopter, this is your statistical chance of
surviving.

Dennis Hawkins
n4mwd AT amsat DOT org (humans know what to do)

"A RECESSION is when you know somebody who is out of work.
A DEPRESSION is when YOU are out of work.
A RECOVERY is when all the H-1B's are out of work."

To find out what an H-1B is and how Congress is using
them to put Americans out of work, visit the following
web site and click on the "Exporting America" CNN news
video: http://zazona.com/ShameH1B/MediaClips.htm

[Rich]

That's the difficult part...from what I have seen..the civil aircraft
data is difficult to determine...kind of like trying to figure out
miles driven for each make and model car...not sure where to get any
of this data. I have searched for it in the past. Sorry to be a wet
blanket...just hate to see the wrong conclusions made on any make and
model.

I'll keep looking..if I find the info I will post...someone has to
have it...!

Rich..


wrote in message >...
> (Rich) wrote:
>
> > number of hours). In simple terms..the denominator is missing....this
> > is a raw count of accidents...
>
> So where do we get those numbers from? We need the total number hour
> hours for each make. This may be hard to come by. Is there any
> database with this info?
>
> The only thing the data so far provided says, is that if you are in a
> crash in this type of helicopter, this is your statistical chance of
> surviving.
>
> Dennis Hawkins
> n4mwd AT amsat DOT org (humans know what to do)
>
> "A RECESSION is when you know somebody who is out of work.
> A DEPRESSION is when YOU are out of work.
> A RECOVERY is when all the H-1B's are out of work."
>
> To find out what an H-1B is and how Congress is using
> them to put Americans out of work, visit the following
> web site and click on the "Exporting America" CNN news
> video: http://zazona.com/ShameH1B/MediaClips.htm