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V speeds

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Sbennett3(at)aol.com
Guest

Posted: Wed Oct 31, 2007 2:11 pm Post subject: V speeds

Guys, My plane was to originally be constructed  as a model 4 1050 long wing. The builder of the plane built it to be a speedwing  version. I'm new to the whole kitfox thing and my book shows the v speeds for  the longwing version. Can anybody point me in the direction of a site where I  can copy them ??? Steve Bennett



  [quote][b]

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MichaelGibbs(at)cox.net
Guest

Posted: Wed Oct 31, 2007 7:38 pm Post subject: V speeds

Steve sez:



 	  Quote: 	
		  I'm new to the whole kitfox thing and my book shows the v speeds for 

the longwing version. Can anybody point me in the direction of a 

site where I can copy them ?


	


I think you would be better off figuring out what they are for your 

airplane yourself.  Because they are not coming off an assembly line, 

every Kitfox will be a little bit different from every other and 

there will also be idiosyncrasies in the pitot/static system and 

airspeed indicator.  I could tell you my numbers but they may or may 

not apply to your airplane.  If you measure your own you'll be sure 

that they are numbers you can count on.



Vso and Vsi are pretty easy to determine, just do some stalls with 

and without flaps deployed.  Vy will require measuring climb rates at 

several speeds to determine where the maximum rate happens (it's best 

to measure the rate with the altimeter and a stopwatch rather than 

relying on the VSI).  Vx will require a little math to determine the 

point at which the highest climb per distance traveled occurs (take a 

bunch of measurements and do the calculations back at the hangar). 

Best glide speed can be determined in the same way as Vy, by 

measuring sink rate at several speeds.  Vy is a reasonable place to 

start looking for glide speed.



Mike G.

N728KF

Phoenix, AZ

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Thu Nov 01, 2007 12:29 am Post subject: Re: V speeds

Steve, this is likely the same data that you have for your IV  1050  model but if not I got the info here    http://www.cfisher.com/IVspecs.html

Dave

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Thu Nov 01, 2007 7:24 am Post subject: Re: V speeds

Steve,  I agree you need to test your plane to determine the V speeds for it.  Here is a link to the FAA's advisory circular AC-90-89A. http://www.faa.gov/library/manuals/aircraft/media/ac90-89a.pdf  The procedure to determine best rate and best angle starts on page 47.  It explains and shows how to make a graph to determine best angle.  It is kind of fun and satisfying to do.

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503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

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