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Reduce float on landing

Messages
65
Country
us-washington
So I've got this FSX plane I'm working on that flies nearly perfectly, which I'm sure of because I used to own one in real life: 39 hours in a Culver Cadet taildragger. It's a flap-less plane btw. Using Airwrench I've got every thing surprisingly close to how I remember it (I flew it during the late 1980's). The one thing that is off is I'm getting a longer float after flaring, despite nailing the approach speed I used to use (80 mph). I've tried 75 and 70 and still the float is too long. I'd like to reduce that float without messing with most of the existing parameters: gross weight, wing span and area, cruise speed, climb rate, engine HP. All of those things are right on. Any suggestions?
 

Roy Holmes

Resource contributor
Messages
1,720
Country
us-virginia
Since you are using AirWrench, what is the stalling speed given on the airfoils page?.
You should make the approach speed for a taildragger something like 20% to 30% higher than the stall. Your float should end when you are at or just above stall speed.
It almost certainly will carry on below the normal stall speed in the sim because the standard air file Record 400 give a 1.25 scalar to CL due to ground effect.
If your stall speed seems low you can reduce CL max in record 404, if it is about right you can change 400 to read something less than 1.25 in the first line. You can edit this record in the XY page of AirWrench.
It is just possible than your engine idle speed is a bit high. Should be about 700 RPM.
Roy
 
Messages
65
Country
us-washington
Those are great ideas, thanks. I hadn't thought of the stall speed. I plugged in 45 for stall speed. I think I'll try changing that to 55-58 and see if that does the trick. Thanks again.
 
Messages
22
Country
germany
You can check and adjust V-speeds and engine(and more)without starting the sim with AJPC http://www.aero.sors.fr/designer_pilot_utilities.html

Just in case you are not aware of this free software, i'm using it to save time. I had a similar floating problem this days - my idle thrust was too high. Of course i tried to adjust ground effect, flaps, lift, drag, even to move wing aerodynamic center before i checked the engine :)
 
Messages
65
Country
us-washington
Thanks guys. It's now perfect! Took a little trial and error, but I've got it all dialed in now. :)

I also found a "mph" instead of "knots" airspeed indicator, which is also more realistic for this old 1941 antique.
 
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