Get it up pretty high, reduce throttle and add elevator. When the ailerons begin to lose effectiveness you are about as slow as you want to go. A little more elevator and you will have an opportunity to also evaluate the stall and stall recovery characteristics of your plane.
I'm guesssing that you are thinking of buy one. The GWS C130 is a very gentle flier. It hand launches very easily at full throttle and level to slightly down toss. Toss it like you are trying to toss a tennis ball about 15 feet.
It can fly very slow, almost like a Slow Stick meaning close to a slow jog speed, but without the sudden up/down of the Slow Stick. During stalls, mine just drops its nose gently. It will loop and roll....but certainly does not look anything like scale doing that
Built mine completely stock and by the book. It WILL NOT take off from even very short grass, but a paved driveway is perfect. If I was building mine over though, I'd leave the landing gear off and just keep hand launching it.
I used the throws in the book and they were spot on for good handling.
elevator - up/down 12mm
ailerons - up/down 10mm
rudder - left/right 20mm
My CG was at 50mm from the leading edge at the wing root.
The only difficult part of the building was the mounting of the prop savers. They are VERY tiny and delicate. When it comes time to mount the motors and prop savers, have a steady, gentle hand....or find someone who does.
If you know the weight and wing area and it can be worked out, near enough.
V = √( 2 W g / ρ S Clmax ) where: V = Stallspeed M/s ρ (rho) = air density KG/M^3 (about 1.2 kg/m3) g = 9.81 m s^-2 S = wing area M^2 Cl_max = Max Coefficient of Lift W = mass KG
Or, a simplified approximate calculation in ‘old units’ =
stallspeed = 5.25 * √wing loading
speed in mph
wing loading in oz/sqft
I'm impressed...but what Maybe when I was in school 50 years ago my friend Anyhow, even if I could work that out into actual mph or kph, what would that look like in the air? Let's just go with the fact that I can do a very fast walk, or a slow jog, and still keep up with my GWS Cargrtrans at its slowest airspeed.
I finally finished modifying it to brushless, power wise. Weight came out at 22 oz. with no battery. Used a Nano Tech 2200 mahr for thrust testing & rpms. RTF weight is now 23 oz.
Thrust @ takeoff is 38 oz ....prop speed @ T O is 44 mph.
I am winding the GWS HD 5 x 3 x 3 blades pretty high at about 14,000 rpm.
It will pull vertically out of my hand. 22 amps at WOT.