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I have them on the 421 (they were on it when I bought it).
*Seriously* improved low speed handling.
Small gross weight increase.
You need to be aware of the reduced Va (wont find much on this in
writing).
Overall, I dont think Id buy them if I owned a 421 without them.

On 18 Feb 2002 09:47:19 -0700, jim rosinski
wrote:

>Has anyone installed vortex generators on their plane? Do they work? How do
>they compare in performance to STOL conversions? MicroAerodynamics has a kit
>for $1450. Claims are 8% reduction in stall speed, and zero speed penalty in
>cruise. If true, it seems like a good investment for anyone planning short
>field and/or soft field takeoffs and landings. Their web address is
>www.microaero.com. Thanks in advance for advice on this issue.
>
>Jim Rosinski
>N3825Q

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