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Maneuvering Speed SAIB

 
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bakerocb



Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

PostPosted: Tue Jan 18, 2011 2:24 pm    Post subject: Maneuvering Speed SAIB Reply with quote

1/18/2011

Hello Fellow Builders and pilots. I found this FAA SPECIAL AIRWORTHINESS
INFORMATION BULLETIN of interest:

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/dc7bd4f27e5f107486257221005f069d/3c00e5aa64a2827e8625781c00744393/$FILE/CE-11-17.pdf

A copy is also attached to this email / posting.

OC


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ftyoder(at)yoderbuilt.com
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PostPosted: Tue Jan 18, 2011 8:01 pm    Post subject: Maneuvering Speed SAIB Reply with quote

Thanks 'OC', a good reminder!

---


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BlueSkyFlier



Joined: 27 Jan 2011
Posts: 74
Location: UK

PostPosted: Fri Feb 11, 2011 12:34 am    Post subject: Re: Maneuvering Speed SAIB Reply with quote

Mmmmmm ... I'm scratching my head here (trying to mis the few hairs I have left Surprised)

With some 30 years of working with these equations I struggle to understand how acceleration in itself can cause damage.

That is why an autumn leave - though structurally flimsy - can execute maneuvers we can only dream of. So if you weigh less you can handle more acceleration ipso facto - no problem.

Problem arises when your weight is unequally distributed (i.e. empty wings and two beefy occupants). That's when you'll break something if your don;t watch your G's. Strap in a most petite pilot and fill up the wings with more weight then she has and she'll be able to throw that plane around like you wouldn't believe - no trouble.

Just my two bits ...

- Alfred


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sstearns2(at)yahoo.com
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PostPosted: Fri Feb 11, 2011 10:42 am    Post subject: Maneuvering Speed SAIB Reply with quote

Careful with pulling G's. It's a lot more than the wings. The engine mount comes to mind. It's still holding up a 200-300 pound engine regardless of the flying wieght of the airplane.

Scott

--- On Fri, 2/11/11, BlueSkyFlier <bleuskyfly(at)teledynamix.com> wrote:

Quote:

From: BlueSkyFlier <bleuskyfly(at)teledynamix.com>
Subject: Re: Maneuvering Speed SAIB
To: kis-list(at)matronics.com
Date: Friday, February 11, 2011, 12:34 AM

--> KIS-List message posted by: "BlueSkyFlier" <bleuskyfly(at)teledynamix.com (bleuskyfly(at)teledynamix.com)>

Mmmmmm ... I'm scratching my head here (trying to mis the few hairs I have left Surprised)

With some 30 years of working with these equations I struggle to understand how acceleration in itself can cause damage.

That is why an autumn leave - though structurally flimsy - can execute maneuvers we can only dream of. So if you weigh less you can handle more acceleration ipso facto - no problem.

Problem arises when your weight is unequally distributed (i.e. empty wings and two beefy occupants). That's when you'll break something if your don;t watch your G's. Strap in a most petite pilot and fill up the wings with more weight then she has and she'll be able to throw that plane around like you wouldn't believe - no trouble.

Just my two bits ..

- Alfred

--------
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http://forums.matronics.com/viewtopic.php?p=330563#330563
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[quote][b]


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BlueSkyFlier



Joined: 27 Jan 2011
Posts: 74
Location: UK

PostPosted: Fri Feb 18, 2011 12:39 pm    Post subject: Re: Maneuvering Speed SAIB Reply with quote

Agreed Sott.

All moment arms come into play - that's why weight distribution (weight as a force) is so important. With the big 360 up front you know about that.

Bottom line - slow down when the air gets turbulent, and then slow down even more if airframe weight distribution is not as good as it could be.

Regards,
Alfred


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Flyinisfun(at)aol.com
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PostPosted: Fri Feb 18, 2011 8:12 pm    Post subject: Maneuvering Speed SAIB Reply with quote

Man do I ever know about maneuvering speed. I have the 0-320 Lyc. in my two place and those little short wings just don't ride the bumps very well. I have hit rough air and cracked my head on the ceiling several times before I could get it slowed down. I have tested my wings several times trying to run my engine wide open and couldn't shut it down fast enough. I can indicate 180 mph full throttle and I believe that is about the limit I want to see. Is anybody else consisently doing more?

Jesse



--> KIS-List message posted by: "BlueSkyFlier" <bleuskyfly(at)teledynamix.com>

Agreed Sott.

All moment arms come into play - that's why weight distribution (weight as a force) is so important. With the big 360 up front you know about that.

Bottom line - slow down when the air gets turbulent, and then slow down even more if airframe weight distribution is not as good as it could be.

Regards,
Alfred
[quote][b]


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ftyoder(at)yoderbuilt.com
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PostPosted: Sun Feb 20, 2011 12:06 pm    Post subject: Maneuvering Speed SAIB Reply with quote

Hi Jesse,

What was your RPM at 180 mph? I think vne is 212 mph, I haven't looked at that no. on the airspeed in a while, so correct me if that isn't right. What altitude were you with the 180 mph indicated?

My max IAS is 195 mph (at) 2800 rpm (at) 3000' msl, my airport is 1400'. I remember you are out of Denver, so I guessing you were a bit higher.

I took a demo ride with Rich at Merced in 93 and he did a low pass down the runway indicating 195/200 mph. I don't know how accurate his indicator was.
[quote] ---


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