Luciole, FIXED LEADING EDGE SLAT, reduce stall speed ?
Posted: Wed Sep 21, 2016 10:08 am
Hi All
I know that the Luciole does not make it in to the SSDR class due to the stalling speed being above 35Kt
However could the Luciole wing be manufactured with a FIXED LEADING EDGE SLAT within the current wing plan profile ?
Slats can improve wing lift by *40% but at the cost of slightly extra drag at high speeds.
Are there any other factors other than the stalling speed that would exclude the Luciole from being in the SSDR class ?
Is there anybody up to speed with Xfoil software or similar who could look at this to see if it is really possible to increase the Cl max by adding fixed slats to the Luciole wing to get the stalling speed below 35Kt ?
Julian Mills
* Mechanics of flight (9th edition A C Kermode)
---------------------------------------------------------------------------------------
The stalling speed has been calculated from Lift=1/2* q* V2 *Cl *S
Typical Cl max values have been use for the relative wing config
It looks like sub 35 Kt stall speed could be possible !!!!
MAUW_____Wing area_____Wing Config____Cl max____Stall speed
200 kg_____4.6m2________Clean__________1.2_______47 Kt
200 kg_____4.6m2________Flap___________1.8_______38 Kt
200 kg_____4.6m2________Flap & Slat_____2.25______34 Kt
The table above was added (7 Oct 2016)
Julian Mills
I know that the Luciole does not make it in to the SSDR class due to the stalling speed being above 35Kt
However could the Luciole wing be manufactured with a FIXED LEADING EDGE SLAT within the current wing plan profile ?
Slats can improve wing lift by *40% but at the cost of slightly extra drag at high speeds.
Are there any other factors other than the stalling speed that would exclude the Luciole from being in the SSDR class ?
Is there anybody up to speed with Xfoil software or similar who could look at this to see if it is really possible to increase the Cl max by adding fixed slats to the Luciole wing to get the stalling speed below 35Kt ?
Julian Mills
* Mechanics of flight (9th edition A C Kermode)
---------------------------------------------------------------------------------------
The stalling speed has been calculated from Lift=1/2* q* V2 *Cl *S
Typical Cl max values have been use for the relative wing config
It looks like sub 35 Kt stall speed could be possible !!!!
MAUW_____Wing area_____Wing Config____Cl max____Stall speed
200 kg_____4.6m2________Clean__________1.2_______47 Kt
200 kg_____4.6m2________Flap___________1.8_______38 Kt
200 kg_____4.6m2________Flap & Slat_____2.25______34 Kt
The table above was added (7 Oct 2016)
Julian Mills