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Your Recommendations Please

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n1cxo320(at)salidaco.com
Guest

Posted: Fri Sep 29, 2006 8:26 am Post subject: Your Recommendations Please

Recently I posted a querry re calibrating my  airspeed indicator. After testing and verification there is no doubt my  

 ASI is simply in error (Its a United 8125 TAS from  Van's) so I have decided to replace it.

  

 Now, I would like a digital TAS, but can't find one  that is reasonably priced and that would fit in a 3 1/8-inch hole. I can find a  MGL digital but it is only an 'indicated' ASI.

  

 I could simply replace the present United with  another, but I really like digital.

  

 I also has some hesitation (don't really know why)  about using a non-TAS unit.

  

 Fire away..I need fodder to support a  decision.

  

   [quote][b]

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Doug Gray

Joined: 10 Jan 2006
Posts: 112
Location: Sydney, Australia

Posted: Fri Sep 29, 2006 2:07 pm Post subject: Your Recommendations Please

Do you appreciate that the primary ASI must show IAS or better CAS?  



If it didn't then the colour speed markings would need to be adjustable

for pressure and density altitude. 



TAS is a useful figure for other purposes but does not help in doing the

job of piloting the aircraft. It is also a tricky number to determine

accurately.



Queue Kevin H for complete & more accurate answer....



Doug Gray



On Fri, 2006-09-29 at 10:25 -0600, John Fasching wrote:

 	  Quote: 	
		   Recently I posted a querry re calibrating my airspeed indicator. After

 testing and verification there is no doubt my 

 ASI is simply in error (Its a United 8125 TAS from Van's) so I have

 decided to replace it.

  

 Now, I would like a digital TAS, but can't find one that is reasonably

 priced and that would fit in a 3 1/8-inch hole. I can find a MGL

 digital but it is only an 'indicated' ASI.

  

 I could simply replace the present United with another, but I really

 like digital.

  

 I also has some hesitation (don't really know why) about using a

 non-TAS unit.

  

 Fire away..I need fodder to support a decision.

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av.8(at)bigpond.com
Guest

Posted: Fri Sep 29, 2006 11:30 pm Post subject: Your Recommendations Please

Hi Bert,



I also don't have any increase in rpm prior to engine cutting out using the

mixture control. My O-320 runs sweet and idles smoothly at 600 rpm with

metal FP Sensenich prop.  But you have to be sure that pulling the throttle

back when landing that the engine doesn't die.  In setting the mixture

screw, I simply adjusted it in and out until the engine idled smoothly,

erring if anything on the lean side. If I had of adjusted it on the rich

side then I may have got the rpm increase Lycoming suggest, but it is not a

problem.  Obviously doesn't seem to be one for you either..



Cheers



Martin in Oz

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