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rmurrill(at)cox.net
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 Posted: Thu Aug 16, 2012 5:38 am Post subject: Pulsar weights and engine choices. |
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I recall seeing pictures many years ago purporting to be a 6 g ultimate load test of a Pulsar wing. Believe it was conducted at NAU as part of a student design senior project. I do not remember if it was a wood or glass spar, but I do recall the test went to the full “6g” value....ie sandbags almost to the ceiling, wing tips drooped to the floor. The aviation program at NAU is pretty much gone now, but you might be able to find a report on the web or maybe AIAA archives.
Bob
From: GREGSMI(at)aol.com (GREGSMI(at)aol.com)
Sent: Thursday, August 16, 2012 3:10 AM
To: pulsar-list(at)matronics.com (pulsar-list(at)matronics.com)
Subject: Re: Re: Pulsar weights and engine choices.
The ultimate load is 6G. FAR part 23 requires one and half G safety margin which puts the operating limit load at 4 G. The operating limit is derived from the ultimate load limit. When it says tested, Aerodesigns was stating 6G is the point of failure. On many occasions, Aerodesigns had talked about testing, and in dealing with composites, how any damage would be cumulative. It was always stressed that the Pulsar is not an acrobatic aircraft which is where you might see the higher G loads.
In a message dated 8/16/2012 1:24:37 A.M. Central Daylight Time, mattbrock777(at)gmail.com writes:
| Quote: | --> Pulsar-List message posted by: "mjb777" <mattbrock777(at)gmail.com>
Thanks for your insight Greg and I very much appreciate the following and pride of the Pulsar guys out there. I haven't heard a bad word about the aeroplane other than some of the negative experiences that guys have had with 2 strokes over time.
A quick question with your last comment. I have numerous official Aero Designs pulications that state the "G-Limits (Tested) +6.0/-4.0". There is never a mention in any of these brochures or my construction and operation Manuals, (that I can see anyway), that mentions +4.0G?
Could you provide me with a reference as even if I proceed to the original design specifications then this is very important.
Regards and thanks again for your input.
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381005#381005
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mjb777
Joined: 11 Aug 2012
Posts: 54
Location: Dubai UAE
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| Posted: Thu Aug 16, 2012 6:29 am Post subject: Re: Pulsar weights and engine choices. |
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Interesting and I think I may have come across something similar however, as many have said on this, lets say 'inspirational' post of mine is that they think that at 4G at the design weight, the elastic limit may be exceeded and permanent cumulative damage may start to occur.
That right Greg?
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_________________
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer. |
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paqs345(at)gmail.com
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| Posted: Thu Aug 16, 2012 7:12 am Post subject: Pulsar weights and engine choices. |
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With composite airplanes, there is little fatigue damage accumulating,
unlike with metal airplanes. If you exceed the limit load, it is not
likely to yield or get bent, but if you exceed ultimate load, it will
break all of a sudden.
Sonja
On 8/16/12, mjb777 <mattbrock777(at)gmail.com> wrote:
| Quote: |
Interesting and I think I may have come across something similar however, as
many have said on this, lets say 'inspirational' post of mine is that they
think that at 4G at the design weight, the elastic limit may be exceeded and
permanent cumulative damage may start to occur.
That right Greg?
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381024#381024
|
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bernard.wilder2(at)gmail.
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| Posted: Thu Aug 16, 2012 7:22 am Post subject: Pulsar weights and engine choices. |
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There was also static test done in Europe,,, Germany, I think.
Bernie Wilder
On Thu, Aug 16, 2012 at 9:37 AM, Bob <rmurrill(at)cox.net (rmurrill(at)cox.net)> wrote:
[quote] I recall seeing pictures many years ago purporting to be a 6 g ultimate load test of a Pulsar wing. Believe it was conducted at NAU as part of a student design senior project. I do not remember if it was a wood or glass spar, but I do recall the test went to the full 6g value....ie sandbags almost to the ceiling, wing tips drooped to the floor. The aviation program at NAU is pretty much gone now, but you might be able to find a report on the web or maybe AIAA archives.
Bob
From: GREGSMI(at)aol.com (GREGSMI(at)aol.com)
Sent: Thursday, August 16, 2012 3:10 AM
To: pulsar-list(at)matronics.com (pulsar-list(at)matronics.com)
Subject: Re: Re: Pulsar weights and engine choices.
The ultimate load is 6G. FAR part 23 requires one and half G safety margin which puts the operating limit load at 4 G. The operating limit is derived from the ultimate load limit. When it says tested, Aerodesigns was stating 6G is the point of failure. On many occasions, Aerodesigns had talked about testing, and in dealing with composites, how any damage would be cumulative. It was always stressed that the Pulsar is not an acrobatic aircraft which is where you might see the higher G loads.
In a message dated 8/16/2012 1:24:37 A.M. Central Daylight Time, mattbrock777(at)gmail.com (mattbrock777(at)gmail.com) writes:
| Quote: | --> Pulsar-List message posted by: "mjb777" <mattbrock777(at)gmail.com (mattbrock777(at)gmail.com)>
Thanks for your insight Greg and I very much appreciate the following and pride of the Pulsar guys out there. I haven't heard a bad word about the aeroplane other than some of the negative experiences that guys have had with 2 strokes over time.
A quick question with your last comment. I have numerous official Aero Designs pulications that state the "G-Limits (Tested) +6.0/-4.0". There is never a mention in any of these brochures or my construction and operation Manuals, (that I can see anyway), that mentions +4.0G?
Could you provide me with a reference as even if I proceed to the original design specifications then this is very important.
Regards and thanks again for your input.
Matt.
--------
Pulsar 1 TD Kit.
Captain B777.
Licenced Aircraft Maintenance Engineer.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381005#381005
|
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