ceengland(at)bellsouth.ne
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 Posted: Thu Apr 20, 2006 4:15 am Post subject: 6 A is flight level:thread shift: wing AOA |
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Related to the nose varying from 'true': My -7 leading edges, both tank skins & outboard leading edges, actually have a 'dip' both above & below the nose. I've also seen this on other current kits. I called Van's tech guys & they basically didn't care. They just said it's an artifact of the LE forming process & refused to discuss any detrimental aerodynamic effects.
Have any others noticed this?
Has anyone actually tried to do something to correct it?
Is it worth trying to correct (meaning is there a speed penalty for ignoring it)?
If you want to check yours, run your fingers from the leading edge toward the trailing edge & if it's there, you'll feel a significant dip just back of the rolled leading edge.
Charlie
| Quote: |
From: Kevin Horton <khorton01(at)rogers.com>
Date: 2006/04/19 Wed PM 08:24:27 CDT
To: rv-list(at)matronics.com
Subject: Re: 6 A is flight level when?
The AOA will be quite low. If the airfoil was a true 23013.5 series,
and this was a 2D wing (i.e. there were no effects from the fuselage
or wing tip, the AOA at 1600 lb, 212 mph at 8,000 ft would be about
0.3 degrees (value calculated by XFOIL). If we drop the cruise speed
to 189 mph, the AOA would be about 0.6 degrees.
I understand that the leading edge of the RV airfoil differs slightly
from the NACA profile. And, the local AOA is not constant along the
span, due to the effect of the fuselage and wing tip. So the above
values must be considered as approximate.
Kevin Horton
On 19 Apr 2006, at 19:55, Tracy Crook wrote:
>
>
> True, which brings up a related subject.
>
> Anyone know what the AOA of the 230xx airfoil on the RV is at any
> typical cruise speed? I need to make a decision on whether to
> change from stock RV incidence on my "long wing" RV-8. Span is 3
> feet longer than stock which should result in a lower AOA for any
> given condition. I have a program to predict the appropriate
> change but don't know what it is to start with and haven't seen it
> in the plans book.
>
> Tracy Crook
>
>
>>
>> <mjurotich(at)hst.nasa.gov<mailto:mjurotich(at)hst.nasa.gov>>
>>
>> I presume the top longeron is "level" when in straight and
>> level flight.
>
> The pitch attitude in straight and level flight will depend on the
> airspeed, weight and flap angle, and to a less extent, on CG.
>
> Kevin Horton RV-8 (finishing kit)
> Ottawa, Canada
> http://www.kilohotel.com/rv8<http://www.kilohotel.com/rv8>
>
>
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