Talk about stalls

[facthunter]

Done a few C/ME/IFR renewals in the Duchess( B 76.) Cost me many $$$$'s. If you have less than 1 G, the stall speed is lowered and so is the DRAG and also the control effectiveness.. The extra mass of engines on the wings makes spins much More risky. DON'T go there. Nev

Edited February 22 by facthunter
typo

[Thruster88]

5 hours ago, facthunter said:

Why is it better to fly faster if you are Heavy? Nev

No definitive answer yet. The cruise performance chart for my muskeeter shows  maximum range is achieved at the highest altitude in the chart, 10500 and the lowest power setting, 50%. 784nm in 8.6 hours. No wieght is stated so presume this is at MTOW. Higher power at lower levels reduces range by 130 nm. 

[rgmwa]

Perhaps `better' needs to be better defined. 

[facthunter]

Gliders trying for speed carry water to UP the weight. Maintain BEST Lift AoA means faster airspeed needed when heavier than when you are Light. If you are already faster than needed, go higher. It was answered a while back but further  consideration doesn't hurt unless we start wandering away from the essential Principle of wing efficiency . Low wing loaded Planes have too Much wing except when taking of and landing and at Service ceiling which IS ? Lack of Power comes into that as well.   Fixed tri gear  and fairly low cruise speed of the Musketeer means to go higher is better Nev

[rgmwa]

Thanks for the explanation. I see what you're getting at now. Service ceiling is the maximum density altitude at which an aircraft can maintain a minimum practical rate of climb which might be 100 ft/min for a typical GA aircraft. 

Edited February 23 by rgmwa

[facthunter]

Good  work.   It's Not that easy on line. Nev

[Thruster88]

Sure, more weight in a 40,50:1 LD glider will make them go faster, they are powered by potential energy after all. More weight in a powered aircraft = less climb rate, less cruise speed for a given power setting so less effcient.

[BrendAn]

5 hours ago, rgmwa said:

Thanks for the explanation. I see what you're getting at now. Service ceiling is the maximum density altitude at which an aircraft can maintain a minimum practical rate of climb which might be 100 ft/min for a typical GA aircraft. 

thats how sam ganow of rebuild rescue died.  the airport he took off from  was above the maximium ceiling for one engine. as soon as he took off one engine failed and all he could do was fly into the ground .  died from get there itis. one side tank had water in it from a perished fuel cap seal and never did a fuel drain check ..

[facthunter]

You have missed the point entirely . Disappointing   since I've gone to a lot trouble to explain the circumstance where things happen and why. How about reading my posts fully. Powered Planes are there to carry things so by your Logic the Less you carry the More efficient it is . The object is to Move PAYload efficiently to be profitable. Nev

[BrendAn]

2 minutes ago, facthunter said:

 

i am curious. quite often i read about twins that go down on one engine. why would you not make them powerful enough to climb and fly on one.

[Thruster88]

15 minutes ago, BrendAn said:

i am curious. quite often i read about twins that go down on one engine. why would you not make them powerful enough to climb and fly on one.

Twins most often go down because of a thing called Vmc roll over.

[facthunter]

In  earlier times Engines were not capable of being feathered. and  Most  Twins would not maintain Height on one engine. It was just accepted that is the situation. Later it was Made a requirement by Airwothiness Bodies but Many are still Marginal when at Max Wt. for the conditions. You Must also attain and keep at or above the VMC(a) airspeed to maintain Control. or you will have to reduce Power on the good Motor till you do. You have to "Milk the Mouse" to fly a twin at Max Wt on one motor just after Lift off. Stall is Below Vmc(a) in all cases I am aware of.  Naturally any twin that flies ok on one engine goes real good on 2 . Nev

[BrendAn]

 

[djpacro]

Excellent stuff from Phil. He has quite a few videos in this series.

[facthunter]

Showing off a bit. At least you get to see how quickly SOME planes enter a spin. As you well know ALL planes are different and where the C of G is also makes a lot of difference. Unloading a wing will instantly (almost) unstall it. Under one G with fairly quick forward stick. as distinct from the Normal reaction as the nose drops, which is "instinctive" back stick.  Nev

[facthunter]

When you do an intended stall you are ready for it. The stalls that Kill you, you are  not ready for.. Nev

[facthunter]

When you stall , you FALL. There's nothing holding them up otherwise.  For the WING to do it's THING you Must get a reaction to the air passing over the wing sufficient to keep you up there even when pull extra "G" if that's what you are about. Nev