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Elevator Limits (Cessna 172)

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dougsnash(at)yahoo.com
Guest

Posted: Fri Mar 28, 2008 5:37 pm Post subject: Elevator Limits (Cessna 172)

Tim, while this is a little off topic, I think there

was something about a Gross Weight increase on the 172

if the controls and flaps were limited.  



When I did my 172 check ride last year (up from 152s)

I was surprised that the flaps would not come all the

way down, the GWT increase was the reason I was given.



Do not archive



Doug MacDonald

CH-701 Scratch builder

NW Ontario, Canada'



--- Tim Juhl <juhl(at)avci.net> wrote:



 	  Quote: 	
		   

 <juhl(at)avci.net>

 

 I read CH's letter with great interest.  At least a

 little light has been shown on the issue of

 structural failure and a "fix" that may help reduce

 such tragedies.

 

 The discussion of adding elevator stops brought

 something to mind that I thought I would share.  I

 have instructed in Cessna 172's varying in vintage

 from 1956 to 1985.  I owned a 1968 model for 23

 years.  I was surprised to find in the 1985 models

 that the max flap extension had been reduced to 30Â°

 and both aileron and elevator deflections had been

 limited.  Indeed, I found that the older aircraft

 had greater ability to get in and out of short

 strips and deal with strong, gusty crosswinds. 

 True, the later models were a little faster and for

 the most part I never noticed the control limits,

 but I can imagine situations where the extra travel

 might have been useful.


	


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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Sat Mar 29, 2008 4:30 am Post subject: Re: Elevator Limits (Cessna 172)

The increase in gross weight was one of the reasons cited.  Another was the problem some pilots experienced if they initiated a go-around with full flaps extended.  There was also the long standing concern about full flaps blanking the tail in a forward slip although I've intentionally tried to make that happen with no success.  



One of the things that surprised me was in checking aileron control movement was that you used to be able to turn the wheel 90Â° to either side while on the 1985 model you were hitting the stops at maybe 50Â°.  Now - I will admit I did not take a protractor and measure actual aileron deflections so maybe the change wasn't that extreme.  Anyone who has flown a very early 172 and a 1985 or later model knows that they are two very different machines.



Tim

do not archive

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ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Mon Mar 31, 2008 8:55 am Post subject: Re: Elevator Limits (Cessna 172)

I've rented various 152s of which some of them had 40 degrees of flap and others were only 30 degrees. Neither were aerobats or anything. I figured it was just some design change that had occurred from one year to the next.



 	  Tim Juhl wrote: 	
		  The increase in gross weight was one of the reasons cited.  Another was the problem some pilots experienced if they initiated a go-around with full flaps extended.  There was also the long standing concern about full flaps blanking the tail in a forward slip although I've intentionally tried to make that happen with no success.  



One of the things that surprised me was in checking aileron control movement was that you used to be able to turn the wheel 90Â° to either side while on the 1985 model you were hitting the stops at maybe 50Â°.  Now - I will admit I did not take a protractor and measure actual aileron deflections so maybe the change wasn't that extreme.  Anyone who has flown a very early 172 and a 1985 or later model knows that they are two very different machines.



Tim

do not archive

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planecrazydld(at)yahoo.co
Guest

Posted: Thu Apr 03, 2008 4:50 pm Post subject: Elevator Limits (Cessna 172)

all the 150s I flew were 40° while all the 152s were 30°. May have to do with the model?



ashontz <ashontz(at)nbme.org> wrote:[quote] --> Zenith-List message posted by: "ashontz" 



I've rented various 152s of which some of them had 40 degrees of flap and others were only 30 degrees. Neither were aerobats or anything. I figured it was just some design change that had occurred from one year to the next.

Tim Juhl wrote:

[quote] The increase in gross weight was one of the reasons cited.  Another was the problem some pilots experienced if they initiated a go-around with full flaps extended.  There was also the long standing concern about full flaps blanking the tail in a forward slip although I've intentionally tried to make that happen with no success.  

 

 One of the things that surprised me was in   [quote][b]

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