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MkIII Xtra V speeds

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mdnanwelch7(at)hotmail.co
Guest

Posted: Wed Jan 19, 2011 7:39 am Post subject: MkIII Xtra V speeds

Kolb guys, and especially Travis,

  

   I am in the process of rounding up information for my

 Operator Limitations manual for my plane.  Could I get a few 

 of you Xtra owners to post your "V" speeds below in the list I

 have provided.

  

   Also, Travis, would you be kind enough to post the factory

 recommended speeds for these catagories, please?  

   

 1) Vso--(stall speed, or min. flight speed in 'landing' configuration {flaps down})_________________

 2) Vs--(min. controllable airspeed in steady state flight {flaps up}____________________

 3) Vfe--(maximun 'flap extended' stall speed)____________________________________

 4) Vno--(max speed for 'normal' operations)_________________________________

 5) Vne--(never exceed speed)_____________________________________________

  

   The Kolb factory states that the MkIII Xtra has a 35 mph stall speed, and 26 mph

 stall speed with flaps extended.  Is this pretty close to what you Xtra owners are

 experiencing?

  

   You response is appeciated.  Thanks!!!

  

 Mike Welch

 MkIII

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pj.ladd(at)btinternet.com
Guest

Posted: Wed Jan 19, 2011 9:55 am Post subject: MkIII Xtra V speeds

Hi Mike

 Stats are.

 Mk3xtra with Jab 2200. MAUV 943 lbs

  

 Stall flaps up.engine off 35mph

 Flaps down. 5mph less

 Cruise happily  50 to 80.

 I usually use around 70 to 75mph

 Ticketed at Vne 95mph

 Ticketed. Flaps down  60mph

 Min pilot weight with no ballast.  170  lbs.

  

 I usually take off single stage flap/climb out  around 50mph.

 Land . Flaps  down, engine idle around 50. bleed the speed over the hedge.

  

 Cheers

  

 Pat

   [quote][b]

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Thu Jan 20, 2011 6:34 am Post subject: Re: MkIII Xtra V speeds

Mike,



Using Pat's numbers you can come up with pretty accurate stall speed estimates at different flying weights by using the fact that a change in stall speed varies with the square root of the change in weight.



Baseline

Flying weight of 943 lbs

Stall speeds 35 and 30



Examples:

If flying 10% heavier, 1.1 x 943 = 1,037 lbs...

Stall speeds should be 1.1^.5 = 1.049 ==>> 36.7 and 31.5



If flying 15% lighter, .85 x 943 = 802 lbs...

Stall speeds should be .85^.5 = .922 ==>> 32.3 and 27.7



Vfe and Vne don't vary with flying weight.

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_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

mdnanwelch7(at)hotmail.co
Guest

Posted: Thu Jan 20, 2011 6:58 am Post subject: MkIII Xtra V speeds

> Mike,

 	  Quote: 	
		   

 Using Pat's numbers you can come up with pretty accurate stall speed estimates at different flying weights by using the fact that a change in stall speed varies with the square root of the change in weight.

 Thom Riddle


	


 Thanks Thom!!

  

   You are correct, and I hadn't taken that into account, yet.  Also, thanks to 

 Pat for the V speed numbers.  They do coincide with what I was expecting.

  

 Mike Welch

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