Sport_Pilot

I stand a bit corrected, but a stall with constricted air flow is not the same as full flow stall. The drag is low at shut off conditions because it is operating in a partial vacuum and thus less drag. Also the stall is only partial and the blades are doing work to keep the outlet pressure up. See the chart on the axial fan link and stalled condition is considered at the right side of the chart.

http://www.comairrotron.com/axial_fan_stall.shtml

Sport_Pilot

Every plane I have seen will pick up RPM in the air, thus the load is decreased. A 10-10 prop has the same pitch as an 18-10 prop and both have less load when there is incoming air.

freakingfast

My Feedback: (3)

An 18X10 isn't "square". You'll just have to believe in your own logic or try it for yourself. Try 9X10, 10X10, 11X11, 11X14(old stock) 16X16, I have.

Nuf said, I'm moving on.

alfredbmor

I believe that it will do it fine, very far from being an acrobatic plane but great for the close pictures.
The following data is taken from the manufacturer manual:

Wingspan 64" (1625 mm)
Wing area: 1440 sq in (93 dm2)
Weight: 12.0 - 13.5 lbs ( 5440 - 6120 g) Mine weights 12 lbs. I have checked three times, the first time was 14.
Wing loading: 19.2 - 21.3 oz/sq ft (59 - 65 g/dm2)
Suggested engines: .61 - 1.20 cu in (10.0 - 19.5 cc) two stroke .91 - 1.20 cu in (15.0 19.5 cc) four stroke

I am using this 4 stroke Magnum 1.20 with a top flite prop 15 x 6 (9,150 rpm), I just ordered from Tower 3 Zinger props Pro series of the same size.

freakingfast

My Feedback: (3)

I'm sure it will too. Some words of advice:

Only fly If you feel good about it, don't force or hurry the day.

Take your time with your fist set-up & pre-flight, politely ask the yappers (distractions) to hold their thoughts till after you land.

Let us know how it goes.
Good Luck!

Sport_Pilot

Not square but not at right angles either. The prop pulls in airflow and the airflow prevents it from stalling. Even the 9-10 above isn't even close to stalling. Axial fans don't stall even with ductwork and with pitch angles much greater than a 9-10.

pe reivers

Many airfoils start the stall at about 15° angle of attack. At that value, and accounting for inflowing air, a square prop does not stall at 3/4 diameter and outward, where the prop does most work, and at rpm that have tipspeeds below mach 0.7.
The prop circle inside 3/4 diameter however may stall, and produce the typical stalled sound, depending on rpm. All in all, I think the stall in props is much talked about, but not an everydays occurrence in most applications. Hotliners and speed flight yes.

Sport_Pilot

Pe,
Because of incoming air I doubt the inner circle is stalled. Perhaps briefly when an engine is reved from idle to full power. The angle of a 9-12 prop at the tip is about 22 degrees, but it is the same angle of a 18-12 prop measured 4.5 inches from the center. So being over square is not the issue. More likely its the higher RPM of a speed engine, not at stall, but closer to stall. The sound is likely the tips being at or close to the speed of sound.

pe reivers

No Sport, The snoring of a stalled prop is very typical, and not at all like the sound of high tip speeds.
You are right in that the stalling is rpm depending, and that it does not occur over the whole blade length. I.e., an 8x8 prop is square at the tips, but oversquare at the inner diameters IF the prop has true pitch over the blade length. Lots of room here to play with prop design.

blw

My Feedback: (3)

The hub area of props and rotor blades is a very inefficient area of an airfoil, and produces almost no lift. The hub area produces a lot of drag. Look at the twist built in most props in that area. Props and rotor blades rarely, if ever, stall all the way along the span. Stalls from high speeds in rotor blades start in an area spreading out from the hub, and inward from the tips. The center section is still producing some lift.

pe reivers

We agree in that one Barry