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Aerobatics(at)aol.com
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 Posted: Tue Oct 03, 2006 2:35 pm Post subject: Adverse yaw my bad explaination... |
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In a message dated 10/3/2006 4:12:37 P.M. Central Daylight Time, michel(at)online.no writes:
| Quote: | --> Kitfox-List message posted by: Michel Verheughe <michel(at)online.no>
On Oct 3, 2006, at 9:43 PM, Aerobatics(at)aol.com wrote:
| Quote: | There is a benefit of the forward aerodynamic center, that makes for a
VERY effective rudder
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This is very interesting, Dave, unfortunately I don't understand what
"forward aerodynamic center" is. Could you explain, please? Thanks in
advance.
Michel
PS: I also have gap-sealed rudder.
do not archive |
An arrow keeps straight because of fins on one end and a weight at another. Center of mass ahead of center of area. There is an optimum position for best flight of an arrow.... with that in mind.... If you were to look at a side view of your plane including wheels spinner etc, there is a center of side area . A very simple, yet very effective way of finding that center is to cut a cardboard outline of your plane and find where it balances and poof.... center of side area.. Now like your CG for your wing the same applies to side area. The CG must be ahead of center of side area .... and by how much determines strongly on your yaw stability.... which has an effect on your planes ability to dampen a yaw displacement.... (which could have been initiated by adverse yaw from ailerons)
Now placing the CG way ahead of center of side area takes away from rudder authority. So we must look at where the CG will be for the wing and design the "side" accordingly. Note that the rudder and the KF2 is small, but VERY effective, because the Center of side area and CG are close... yet in the KF5 the rudder is much larger, but ... well you know the rest!
That' is why moving CG forward on you older model KF helps in Yaw...........
We wont even talk about what happens when you add floats!
Best,
Dave
[quote][b]
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Michel
Joined: 10 Jan 2006
Posts: 966
Location: Norway
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| Posted: Wed Oct 04, 2006 1:18 am Post subject: Adverse yaw my bad explaination... |
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Hello Dave, this is very interesting reading, thank you very much.
On Oct 4, 2006, at 12:35 AM, Aerobatics(at)aol.com wrote:
| Quote: | The CG must be ahead of center of side area ....
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Indeed, it makes sense. And it also reminds me of the yachting design
of the leading of the center of effort (forces by the sails) to the
center of lateral plane (wet surface). A properly balanced sailboat
will be slightly weather helm (turning into the wind) when no rudder is
applied, so that it will eventually come to a stop. The opposite,
turning downwind, would be very dangerous.
| Quote: | Now placing the CG way ahead of center of side area takes away from
rudder authority.
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Aha, I understand! A very yaw-stable plane is ... hard to turn. It
makes sense. Thank you for educating me, Dave. Another day with
something new learnt.
Cheers,
Michel
do not archive
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Kitfox 3 - Jabiru 2200 |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Wed Oct 04, 2006 6:11 am Post subject: Adverse yaw my bad explaination... |
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Please! Talk about what happens when you add floats and a ventral fin.
Noel
Still to fly the 'Fox on wheels or skis [quote]
--
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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MichaelGibbs(at)cox.net
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| Posted: Wed Oct 04, 2006 9:05 am Post subject: Adverse yaw my bad explaination... |
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Dave sez:
| Quote: | The CG must be ahead of center of side area...
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I think you are referring to the "center of pressure". Having the
center of gravity forward of the center of pressure is what produces
aerodynamic stability.
Mike G.
N728KF
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