[rebel-builders]VGs

[Dale Fultz]

Hi Walter,, I am some what new to VG's how did they affect it that you had
to start with no flaps??? Also I am not a float person either,, just
curious.. Dale SR-033 N269DF




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[Walter Klatt]

Besides lowering my stall speed by about 10 mph, the VGs also provide a lot
more lift at the float take-off angle. That was a little unexpected
actually, as I previously thought they only lowered stall speed by
sustaining a higher angle of attack before breaking into the stall. But as
we know, more lift at lower speed also creates more drag which then requires
more power.

So I found that after installing the VGs, my lift without flaps was about
the same as before the VGs and with full flaps. The good news is that when I
did apply flaps after gaining speed on the step, I had more lift with the
VGs than before without them, and it jumped off the water pretty quickly
then. In fact with the VGs, I could take off pretty fast without any flaps
at all on the water, where before I needed flaps, especially if heavily
loaded.

So now, with the extra power, and all that lift, it should get off pretty
fast, I think.

On land, it was still faster taking off with full flaps (and VGs) right from
the start of the roll. I guess not having the extra drag of the water is the
difference. However, I did notice a few times when heavily loaded on land
(and hot out), I would still lift off pretty fast, but I had to do a much
longer run in ground effect before it would reach a safe climb speed. I
really noticed the drag in those situations.

I wonder if you guys with the Angus cuffs also experienced similar results.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Dale
Fultz
Sent: April 15, 2008 5:19 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders]VGs

Hi Walter,, I am some what new to VG's how did they affect it that you had
to start with no flaps??? Also I am not a float person either,, just
curious.. Dale SR-033 N269DF




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[Dale Fultz]

Thanks for the reply Walter,, that is kinda along the line I was thinking
but wanted to double check. I did as much reading as I could and asked
questions on the VG's before buying and installing them. I didn't fly
without them and my first flight is in the near future with them installed.
Dale




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