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SV: SV: Picture of fillet

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hans-chr.erstad(at)c2i.ne
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Posted: Wed Jul 14, 2010 12:43 pm Post subject: SV: SV: Picture of fillet

Mark



My KIS is a nose gear version.  It could be that the tail dragger behave

differently.   



I don't think an improved fuselage junction will lower the stall speed, but

it will maybe improve the handeling at 10 kts above stall speed?  I feel I

always am a bit fast on the final approach, as I don't like to fly in the

speed where the pre-stall warning wobbliness occurs.  But, in ground

effect/flare I don't experience the wobbling/unsteadyness.



Last weekend I went to the Duxford airshow in the UK.  All old airplanes

with round fuselages have wing-fuselage fairings that start off with a short

radius at the leading edge and ends with a quite large radius at the rear.  



Regards

Hans Christian



-----Opprinnelig melding-----

Fra: owner-kis-list-server(at)matronics.com

[mailto:owner-kis-list-server(at)matronics.com] På vegne av Mark Kettering

Sendt: 14. juli 2010 16:52

Til: kis-list(at)matronics.com

Emne: Re: SV: Picture of fillet






Sounds like just about a perfect stall warning to me.  I am not saying that

a larger root fillet would not help reduce stall speed.  It may.  But a good

prestall warning is a very important thing to have.



If your aircraft is a tail dragger do you have fairings on the gear leg to

fuselage junctions?



I really like the look of the larger aft wing root fairing.  Not really a

big fan of the big fairing at the forward part of the wing root.



Mark

 	  Quote: 	
		   At stall speed there are noticable pitch buffeting, and if the stick 

is kept in the aft position, the aircraft will sharply drop a wing 

(feels like 90 deg), and I have never attempted to see what hapens 

after this if do not recover from the stall.

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mantafs(at)earthlink.net
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Posted: Fri Jul 16, 2010 8:02 am Post subject: SV: SV: Picture of fillet

Hello Hans,



I also don't like to fly in the prestall buffeting or wallowing.  I think this gives me a warning that helps keep me at a safe margin above stall speed.



I also do not know if better wing root fairings will help reduce this.  At times these sort of detail things are very hard to predict.  If you do not mind spending the time and effort, give them a try.  They do look good!  I think they could slightly reduce cruise drag.  If they reduce or eliminate the prestall buffeting I think that would not be a good thing but then you can add stall strips if needed.



If you are trying to reduced landing distance I would try some other things first.  I think the flaps would be more effective if deflected up to 45 degrees.  Not only will this increase the lift but it will also increase drag and slightly lower angle of attack.  This should allow slight better approaches at a slightly lower speed.  Next I would try to improve the brakes if they are not perfectly effective.



If you are really into changing things a much larger change would be the addition of a belly flap under the fuselage that extends from the flap on one side to the flap on the other side.  If you are really up for a big change I would think about replacing the flaps with split flaps.  Split flaps actually are more effective providing lift and higher lift to drag than plain (like we have) flaps and single slotted flaps.  Split (or maybe even zap) flaps would have been my choice if I designed a plane like this.



Mark



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