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V speeds for MK III

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grantr

Joined: 12 Sep 2007
Posts: 217

Posted: Fri Mar 21, 2008 5:00 pm Post subject: V speeds for MK III

Does anyone know the max speed the flaps can be deployed?



How do you determine your normal approach speed? 1.3 X stall? So stall at 45 approach at  about 60? We have been using 65



Also what is the VNE with out aileron counter weights?



Thanks

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Dave Bigelow

Joined: 29 Jan 2006
Posts: 103
Location: Kamuela, Hawaii

Posted: Sat Mar 22, 2008 1:21 am Post subject: Re: V speeds for MK III

Generally, for ultralights, I use 1.5 times the stall speed for approach.  That would be 45 mph approach for 30 mph stall.  In the case of a 45 mph stall speed, that works out to about 67.



Slow high drag aircraft are more affected by gusts and gradient than their larger cousins who use 1.3 x stall speed for approach.  Also, you end up with more flare energy and can avoid the dreaded "Kolb Kwit"!

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_________________
Dave Bigelow
Kamuela, Hawaii
FS2, HKS 700E

rlaird

Joined: 10 Jan 2006
Posts: 373
Location: Houston

Posted: Sat Mar 22, 2008 5:39 am Post subject: V speeds for MK III

My MkIIIC stalls at about 42mph, and I've always used 60mph as my

approach speed... which is close to the 1.5 x formula (which would be

63mph).  If I feel the need for added authority, I'll approach at 65.

When I practice engine-out landing, I'll approach at 60, which is

close to best-glide, but when I'm at about 200 feet, I'll point the

nose down radically so that I get at least 65mph, so my flare (which

bleeds off a lot of speed) won't slow me down below stall by the time

I let the planet come up and kiss my wheels.  



On Sat, Mar 22, 2008 at 4:21 AM, Dave Bigelow <up_country(at)hotmail.com> wrote:

 	  Quote: 	
		   



  Generally, for ultralights, I use 1.5 times the stall speed for approach.  That would be 45 mph approach for 30 mph stall.  In the case of a 45 mph stall speed, that works out to about 67.



  Slow high drag aircraft are more affected by gusts and gradient than their larger cousins who use 1.3 x stall speed for approach.  Also, you end up with more flare energy and can avoid the dreaded "Kolb Kwit"! [Twisted Evil]



  --------

  Dave Bigelow

  Kamuela, Hawaii

  FS2, HKS 700E





  Read this topic online here:



  http://forums.matronics.com/viewtopic.php?p=171671#171671

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_________________
~~~~~~~~~~~~~~~~~~~
Robert Laird
formerly: MkIIIc w/ 912ULS & Gyrobee
current: Autogyro Cavalon w/ 914ULS
Houston, TX area
http://www.Texas-Flyer.com

by0ung(at)brigham.net
Guest

Posted: Sat Mar 22, 2008 6:34 am Post subject: V speeds for MK III

Does anyone know the max speed the flaps can be deployed?



How do you determine your normal approach speed? 1.3 X stall? So stall at 45

approach at  about 60? We have been using 65



Also what is the VNE with out aileron counter weights?



Thanks



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


	


I asked kolb the same question years back and was told that if you can pull

the handle you are ok....   I don't know what others have done but I started

the white arch at 70. According to kolb the early mkIII did not have a

gusset welded to the actuating arm and the flap torque tube.  Without this

gusset the joint was much weaker and could fail with higher loads.



VNE with out aileron counter weights----  I have never seen any data showing

different vne with or without counter weights.  The only thing I have seen

published is a vne of 100.  (my .02 cents worth,,,  if you have ever

experienced any flutter,,, keep it 15 to 20 below that speed,,,  cancel

that,,,  install the counter weights.)

Approach speeds..  I use 65 solo  and 70 with a passenger.

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