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GeoB

Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA

Posted: Wed Jul 14, 2010 8:04 pm Post subject: Another newbie question:

I have a United sensitive altimeter sitting on my shelf. It confuses me.

When I use it in my car in the mtns it seems to work right, so I assume the

problem lies with me.



When the weather man says high pressure my altimeter starts reading high

altitude. This last coupla weeks of high pressure has shown the highest

'altitude' I have ever seen on it, while on my shelf. Seems to my pea-brain

that it should have been opposite that! Please someone help me unnerstan

this fee-nom-e-nom.

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GeoB

"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors"

Ralph B

Joined: 14 Apr 2007
Posts: 367
Location: Mound Minnesota

Posted: Thu Jul 15, 2010 6:00 am Post subject: Re: Another newbie question:

The lower the pressure, the higher the altimeter should read. I'm not sure what kind of altimeter you have, but when the pressure is high, it should read lower. Someone please correct me if I'm wrong.



I have seen it vary as much as 500' when a low pressure rolls in.



Ralph

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Ralph B

Kolb Kolbra 912uls
N20386
550 hours

by0ung(at)brigham.net
Guest

Posted: Thu Jul 15, 2010 7:53 am Post subject: Another newbie question:

The lower the pressure, the higher the altimeter should read. I'm not  sure what kind of altimeter you have, but when the pressure is high, it should  read lower.



Someone please correct me if I'm wrong  ..



Ralph



 	  Quote: 	
		  >>>>>>>>>>>>>>>>>>>>>>>>>>>>

  
	


 Ralph you are correct...  with one  possibility.      if there is a altimiter setting  window ( kallsman ) window that is adjusted for the proper barometer  setting...  the altitude should read equal...   if not  adjusting the altimeter for the proper barometric reading.   your  statement is correct.

  

 boyd

   [quote][b]

Ralph B

Joined: 14 Apr 2007
Posts: 367
Location: Mound Minnesota

Posted: Thu Jul 15, 2010 10:26 am Post subject: Re: Another newbie question:

Boyd, isn't adjusting the altimeter for field elevation the same as adjusting the pressure in the Kollsman window?



There were some comments awhile back about setting the altimeter for zero elevation or field elevation. As an ultralight pilot, I didn't go anywhere and would set it to zero at the field I flew from. I did this for many years and got used to it. I continued this habit when I got the Kolbra and justified that I wanted to know exactly how high I was above the ground. All is fine and dandy until I go a few hundred miles to the next airport. Then I'm wondering why the altimeter is reading wrong when I land. Needless to say, I have changed my ways and adjusted my altimeter for field elevation before takeoff. I still zero it out on the Firestar because I don't go anywhere with that.



I also notice airshow pilots do the same thing. They adjust it for MSL field elevation to fly to the airport they are performing at and then zero it out before they perform.



Ralph

_________________
Ralph B

Kolb Kolbra 912uls
N20386
550 hours

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Thu Jul 15, 2010 10:57 am Post subject: Another newbie question:

Ralph, Adjust the Kollsman window for barometric pressure and it should read field elevation, conversely, set field elevation and the Kollsman reads local barometric pressure. Setting field elevation at zero is only good so long as barometric pressure remains the same. It you fly to another field where the barometric pressure is the same, you get the difference between the two field's elevations. If you take your Kolb into class alpha airspace the kollsman window is set to 29.92" regardless of local elevation or barometer reading. 



Rick Girard



On Thu, Jul 15, 2010 at 1:26 PM, Ralph B <ul15(at)juno.com (ul15(at)juno.com)> wrote:

[quote] --> Kolb-List message posted by: "Ralph B" <ul15(at)juno.com (ul15(at)juno.com)>

 

 Boyd, isn't adjusting the altimeter for field elevation the same as adjusting the pressure in the Kollsman window?

 

 There were some comments awhile back about setting the altimeter for zero elevation or field elevation. As an ultralight pilot, I didn't go anywhere and would set it to zero at the field I flew from. I did this for many years and got used to it. I continued this habit when I got the Kolbra and justified that I wanted to know exactly how high I was above the ground. All is fine and dandy until I go a few hundred miles to the next airport. Then I'm wondering why the altimeter is reading wrong when I land. Needless to say, I have changed my ways and adjusted my altimeter for field elevation before takeoff. I still zero it out on the Firestar because I don't go anywhere with that.

  

 I also notice airshow pilots do the same thing. They adjust it for MSL field elevation to fly to the airport they are performing at and then zero it out before they perform.

 

 Ralph

 

 --------

 Ralph B

 Original Firestar 447

 N91493 E-AB

 1000 hours

 23 years flying it

 Kolbra 912UL

 N20386

 2 years flying it

 120 hrs

 

 

 

 

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GeoB

Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA

Posted: Thu Jul 15, 2010 11:12 am Post subject: Re: Another newbie question:

>The lower the pressure, the higher the altimeter should read.



That's what I thought I knew till it looked like it was working backwards.



> I'm not  sure what kind of altimeter you have



No Kallsman window, just a knob to set the altitude. Which I haven't touched for several months, as I watch it fluctuate. It is sensitive enough that when driving down the freeway it moves up and down as I go on overpasses and such.

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GeoB

"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors"

by0ung(at)brigham.net
Guest

Posted: Thu Jul 15, 2010 6:08 pm Post subject: Another newbie question:

Boyd, isn't adjusting the altimeter for field elevation the same as  adjusting the pressure in the Kollsman window?



ralph

  

 >>>>>>>>>>>>>>>>>>>>

 yes that is the same....   and if you  adjust the kollsman window the the proper barometric pressure....    the needle will show the elevation.....   if there is a barometric  pressure change and you don't change the kollsman window.  the as the  barometric pressure rises,  the altitude indicated should  decrease.

  

 I always set the kallsman window to show the  correct barometric pressure....  when talking with other pilots and trying  to remain free and clear of their paint.   all the pilots I know use  altitude readings of msl....  not agl...    I could see a  benefit of using agl if doing aerobatic at an air show.  but that is  usually in a closed airspace environment

  

 Boyd 

  

   [quote][b]

pj.ladd(at)btinternet.com
Guest

Posted: Fri Jul 16, 2010 3:07 am Post subject: Another newbie question:

[quote]     all the pilots I    know use altitude readings of msl....  not agl...    I    could see a benefit of using agl if doing aerobatic at an air show.  but    that is usually in a closed airspace environment           

   Boyd 

    

 	  Quote: 	
		  Hi,not in the UK.QNH is usually used X country above 3000ft. QFE is normally given by the field you are going to land at, together with usual landing info. wind,runway in use, circuit direction etc.You then can fly the circuit on your altimeter without mental arithmetic. Circuit height usually 1000ft for light a/c etc and 800 or 600 for microlights.Not sure if there is a `best` way, probably what you are used to but at that stage of the flight the height above ground is paramount and if you land with zero alt. on the clock it seems simpler to me Cheers Pat



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     -  Release    Date: 07/15/10 11:35:00

[b]

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Fri Jul 16, 2010 4:09 am Post subject: Another newbie question:

There is an FAR that covers altimeter  settings. 

  

   top  

(a) Each person operating an aircraft shall maintain the cruising altitude or  flight level of that aircraft, as the case may be, by reference to an altimeter  that is set, when operating— 

(1) Below 18,000 feet MSL, to— 

(i) The current reported altimeter setting of a station along the route and  within 100 nautical miles of the aircraft; 

(ii) If there is no station within the area prescribed in paragraph (a)(1)(i)  of this section, the current reported altimeter setting of an appropriate  available station; or 

(iii) In the case of an aircraft not equipped with a radio, the elevation of  the departure airport or an appropriate altimeter setting available before  departure; or 

(2) At or above 18,000 feet MSL, to 29.92" Hg 

  

The system is set up to operate per the  FAR.  Terrain and obstacle clearance are set up for MSL, and is  field elevation of each airport. 

  

Setting the altimeter to zero at home field is a bad  habit introduced by ultralight instructors that did not know any better, or  because they were not going to fly much further than the airfield  perimeter. 

  

The ultralight folks at Oshkosh and Lakeland still  hold on to this ultralight policy of setting altimeter to zero while flying  their traffic patterns. 

  

john h 

mkIII 

  

************* 

  

    all the pilots I  know use altitude readings of msl....  not agl...    I could  see a benefit of using agl if doing aerobatic at an air show.  but that is  usually in a closed airspace environment         

  	  Quote: 	
		      	  Quote: 	
		       Boyd

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

mdnanwelch7(at)hotmail.co
Guest

Posted: Fri Jul 16, 2010 4:55 am Post subject: Another newbie question:

John,



 



  Interesting that you point it out that there is a regulation for it.  Excellent point!



 



  It often looks like the "small airplane" crowd asks what others are doing regarding lots flying habits and practices, but we seem to forget that there's a "real" airplane bunch 



that would run us over when we don't adhere to proper flying ettiquete.



 



  Even though the light airplane person may not see himself as part of the "factory" crowd, he is expected to follow the federal rules.  Experimental Catagory aircraft are aircraft, and they share the same air as 737s and Piper Arrows.  Maybe we experimenters should look to the "regs" more often, rather than rely on annecdotal advice.



 



Mike Welch



MkIII 

 

From: jhauck(at)elmore.rr.com

To: kolb-list(at)matronics.com

Subject: Re: Re: Another newbie question:

Date: Fri, 16 Jul 2010 07:08:52 -0500





There is an FAR that covers altimeter settings. 

 

  

§ 91.121   Altimeter settings. top 

(a) Each person operating an aircraft shall maintain the cruising altitude or flight level of that aircraft, as the case may be, by reference to an altimeter that is set, when operating—



(1) Below 18,000 feet MSL, to—



(i) The current reported altimeter setting of a station along the route and within 100 nautical miles of the aircraft;



(ii) If there is no station within the area prescribed in paragraph (a)(1)(i) of this section, the current reported altimeter setting of an appropriate available station; or



(iii) In the case of an aircraft not equipped with a radio, the elevation of the departure airport or an appropriate altimeter setting available before departure; or



(2) At or above 18,000 feet MSL, to 29.92" Hg



 



The system is set up to operate per the FAR.  Terrain and obstacle clearance are set up for MSL, and is field elevation of each airport.



 



Setting the altimeter to zero at home field is a bad habit introduced by ultralight instructors that did not know any better, or because they were not going to fly much further than the airfield perimeter.



 



The ultralight folks at Oshkosh and Lakeland still hold on to this ultralight policy of setting altimeter to zero while flying their traffic patterns.



 



john h



mkIII



 



************* 



 

   all the pilots I know use altitude readings of msl....  not agl...    I could see a benefit of using agl if doing aerobatic at an air show.  but that is usually in a closed airspace environment        

Boyd 

  		 	   		  

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Fri Jul 16, 2010 5:07 am Post subject: Another newbie question:

How else would you regulate VFR and IFR cruising  altitudes, terrain, and obtacle clearance?

  

 john h

 mkIII

 [quote]    

 

  Interesting that you    point it out that there is a regulation for it.  Excellent    point!

 

  

Mike  Welch

 

[b]

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

by0ung(at)brigham.net
Guest

Posted: Fri Jul 16, 2010 5:44 am Post subject: Another newbie question:

Circuit height usually 1000ft for light a/c etc and  800 or 600 for microlights.Not sure if there is a `best` way, probably what you  are used to but at that stage of the flight the height above ground is paramount  and if you land with zero alt. on the clock it seems simpler to  me[quote] Cheers Pat

 	  Quote: 	
		  >>>>>>>>>>>>>>>>>>>>. landing may be easier,,,  but if you encounter another aircraft in route  are looking for him in the air in an effort of not trading paint...   altitude above sea level should be more consistent way of knowing where to look. boyd Cheers 	
0

    	  Quote: 	
		  [b]

lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Fri Jul 16, 2010 12:54 pm Post subject: Another newbie question:

Not to mention that the entire island is small enough that  there is probably only one setting you need to make to have your altimeter read  the right altitude no matter where you are. Not sure if there is any terrain  much above flood stage anyway? Keep in mind that the above is not intended to  insult, although the likelihood is probable, allow me to apologize  beforehand.

 Larry

  

 Note: If you forward this email, please delete the forwarding history,  which includes my email address.

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pj.ladd(at)btinternet.com
Guest

Posted: Thu Jul 29, 2010 3:04 am Post subject: Another newbie question:

Hi larry,

 i could tell straight away that it was not intended  to be insulting from the way you apologised in case it was.

  

 Actually I think we have 3 altimeter setting areas  to cover the country. Close attention to these enables us to look out of the  cockpit and avoid Ben Nevis and Scafell Pike (978 metres). Snowdon pokes up a  little way as well. The lowest point is 4metres (about 13ft to you) below sea  level.Miles away. Probably a200 miles or more (just)

 I still think that it a bit wacky to have to engage  in mental arithmetic by flying on sea level pressure to calculate a landing  height at some arbitrary figure instead of everyone flying the circuit at the  same height and landing at zero on the clock

 Pat

 [quote]   ---

GeoB

Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA

Posted: Sun Aug 15, 2010 11:14 pm Post subject: Re: Another newbie question: covering under the seat

I have been staring at my FS-I (when I am not sitting in it making engine noises). It has no fabric on the fuse. The PO took it off and I know not how much of the frame was covered. There is a short piece of aluminum sheet from the pod back, it ends in front of the stick a few inches. What do most Kolbers use under the seat? Do you folks use fabric or metal or?



Thanks!

GeoB

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GeoB

"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors"

GeoB

Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA

Posted: Sun Aug 15, 2010 11:17 pm Post subject: Re: Another newbie question: Inspect wing swivel bolt?

I will be studying all the Kolb material I can find on the FS. But so far I don't know about inspecting parts. I was looking it over and the bolt that extends into the frame that the wing hangs on looks like it is kinda hard to get to. How often should it be inspected? This is the bolt the universal joint for the folding wing attaches with.



Thanks!

GeoB

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GeoB

"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors"

Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Mon Aug 16, 2010 4:35 pm Post subject: Re: Another newbie question:

Geo.



I suppose I'm being a bit snide here with my remark, but I'd say you should take that joint apart to  inspect it every time you trash your wing, or whenever  you detect any evidence of excessive up and down, or lateral  movement at that location.

If I understand you correctly you are talking about the bolt that is actually a welded in part of the cage.  I've never had one, or heard of one that needed to be replaced, but then again I seldom fold my plane.

ces308

Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi

Posted: Wed Aug 18, 2010 7:35 pm Post subject: Re: Another newbie question:

...I was taught in ground school that when you fly from a HIGH to a Low ,to look out below.....



chris ambrose

M3X/Jabiru A-2200   143.8 hrs

n327CS

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