The only advantage that I can see to make the changes suggested is if the
airplane was going to be a dedicated high altitude flyer. This suggested set
up would eliminate the situation Mark L is describing of having his plane
nose up at high altitude.
The problem is that based on what I am hearing
Well, the new airfoil series, designed by Dr. Michael Selig and Dr.
Ashok Gopalaratham with consulting assistance by Dr. Richard Mole and
Mark Lougheed and many other contributors around the world was
extensively modeled and then real time wind tunnel tested. I still have
the thousands of
et-bounces+markwegmet=charter@mylist.net
[mailto:krnet-bounces+markwegmet=charter@mylist.net] On Behalf Of Mark
Jones
Sent: Tuesday, February 06, 2007 8:12 AM
To: KRnet
Subject: RE: KR> Wing incidence and washout
-Original Message-
>Behalf Of Myron (Dan) Freeman
>Sent: Tuesday
Hi Guy's;
I made a discovery today that many of you may already be aware of. I'm planning
on using the AS-5046 airfoil on my new wings (I'm replacing the RAF- 48
airfoil) and I noticed that with an incidence of +1.75 degrees on the root wing
airfoil and a washout of 3 degrees on the outer wing
Myron (Dan) Freeman wrote:
>> I made a discovery today that many of you may already be aware of. I'm
planning on using the AS-5046 airfoil on my new wings (I'm replacing the
RAF- 48 airfoil) and I noticed that with an incidence of +1.75 degrees on
the root wing airfoil and a washout of 3 degrees
I wrote:
> Also, if you reduce the washout by 1 degree, you're probably
> going to go nose up about a half a degree. Personally, if I changed
> anything it'd be to LOWER the incidence by a half a degree at both root
and
> tip, because I find myself cruising at high altitudes in a nose up
...@optusnet.com.au
web: www.members.optusnet.com.au/johnjanet/Martindale.htm
- Original Message -
From: "Mark Langford" <n5...@knology.net>
To: "KRnet" <kr...@mylist.net>
Sent: Tuesday, February 06, 2007 3:03 PM
Subject: Re: KR> Wing incidence and washout
Hi Mark;
OK, I'll try increasing the root wing incidence from 3-1/2 degrees as per
plans, to 4 degrees but keep the 3 degree washout and see what happens to
the lift.
Posted - Tuesday, 02/06/07 7:17 am
Regards
Myron (Dan) Freeman
Indpls, Ind. 46203 USA
mfreem...@indy.rr.com
Myron (Dan) Freeman wrote:
> OK, I'll try increasing the root wing incidence from 3-1/2 degrees as per
> plans, to 4 degrees but keep the 3 degree washout and see what happens to
> the lift.
I didn't say I'd go back to the plans' 3.5 degrees, and certainly didn't
imply that I'd go even further
I wrote:
> The wind tunnel results output shown at
> http://www.krnet.org/as504x/repeat_1m.gif shows that at zero incidence,
> the
> AS5045 (which is what the airfoil templates use at the tip) still has a
> lift
> coefficient of .3,...
Now that I look at it closer, it's closer to .2, but still
I'm sorry, yes, I realized I had said 3-1/2 degrees after I sent the e-mail
and that was wrong. Starting over again, I went back to 3 degrees washout
but increased the root wing incidence to 2-1/2 degrees which helps forward
veiwing. The result is that the wing does well up to 150 mph, there is
-Original Message-
>Behalf Of Myron (Dan) Freeman
>Sent: Tuesday, February 06, 2007 6:59 AM
>I went back to 3 degrees washout but increased the root wing incidence
to 2-1/2 degrees which helps forward
>veiwing.
Myron,
I was the third person to fly the new airfoil. Troy Petteway being
Mark Jones wrote:
> I followed the instructions of the designers of
> the airfoil and set the incidence at 1? at the root and set the washout
> per their specs.
1.75 degrees at the root, -1.25 degrees at the tip, for a total of 3 degrees
of washout. I'd include a link to the drawings, but it
:16 AM
To: KRnet
Subject: Re: KR> Wing incidence and washout
Mark Jones wrote:
> I followed the instructions of the designers of
> the airfoil and set the incidence at 1? at the root and set the
washout
> per their specs.
1.75 degrees at the root, -1.25 degrees at the tip, for
Thanks Guy's I appreciate your input. Before I start tearing down my plane
and cutting new wood, I want to be absolutely certain that I know where I'm
going and why.
Posted - Tuesday, 02/06/07 10:25 am
Regards
Myron (Dan) Freeman
Indpls, Ind. 46203 USA
mfreem...@indy.rr.com
According to my Compufoil2000 program, the zero lift angle of attack for
the AS series airfoils is -2.13 degrees. Quite a difference from what
everyone is saying. With a 2.5 degree AOA at the root there would have
to be over 4-1/2 degrees washout (4.63 to be exact) to get the tip at a
zero lift
Hi Fred;
The problem that got me into this is that as speed increases, the wing angle
of attack into the airflow lessens to the point that at 180 - 190 mph the
wing tip area is showing negitive lift and not just a little. But the bottom
line I believe is that few KR's cruise at this speed
Dan,
I'm not sure I completely understand why at higher speeds your wing
angle of attack will be less. If you are trimmed for level flight at
150MPH going to 180MPH should only require a small amount of trim
adjustment (less than 1 degree I think)
I truly believe that an AOA of 2.5 degrees at
Hi Fred;
>I'm not sure I completely understand why at higher speeds >your wing
>angle of attack will be less.
Yeah, I know what you mean. That's where this model is a big help because
you can see the results. As speed increases, so does lift. Therefore you
have to add down trim to stay level,
So what model are you using?
Fred Johnson
Reno, NV
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On
Behalf Of Myron (Dan) Freeman
Sent: Tuesday, February 06, 2007 11:24 AM
To: KRnet
Subject: Re: KR> Wing incidence and washout
Hi Fred;
>I'm no
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