50% throttle or 50PSI? Even if 50% that doesn’t seem that unreasonable; pretty sure 50% throttle would still get you above 60kts it would just take longer than 100% throttle.
ok, just checking. It was throttle lever at 50%. Seemed kind of low. The thing is it doesn’t take long to take off even at 50% throttle with full flaps & the headwind.
The full flaps position looks more like a speedbrake than a flap! It’s like close to 90deg!
I think that last notch or two of flaps is designed for steep approaches. IIRC, I read somewhere that most normal approaches are done with 20* flaps.
Now you know why they call them “barn doors.”
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Quite some work you did there. I need to get used to it though. First thing i noticed is the liftoff at 60 knots. Was nearly impossible without this mod with flaps 10.
I also “need to get used” to how sensitive the elevator trim is now, it encourages quick tiny adjustments, which also felt almost non existent without the mod, hence trimming felt before like a long ride on route 66.
Need to make a few rounds with this mod as i did not expect the flight model to be THAT different.
Keep up the good work.
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But not intended for takeoff right? Why would the aircraft take off so easily with the barn doors extended?
Define easily. They’ll slow you down, drag is far greater than lift that that point, but with enough thrust you can still overcome it enough to takeoff.
What’s your takeoff roll with no flaps and full power compared to half power and full flaps? If there’s no change, then I would argue something is wrong, but if the full flaps and half power is substantially longer, that seems legit to me.
I’ve not measured distance for takeoff, but it seemed incredibly short tbh. I’d have to experiment. How do you measure distance of takeoff? Time? It took of in <10sec after 1/2 throttle with full flaps it wasn’t a big long distance. I’m about to go test @CpMoustache 's mod to see how it flies.
I would start from the same point on the runway, same taxiway or threshold marking or something, and then see what taxiway you’re passing as you lift off in both cases.
It won’t be to the foot but it should give you a general idea.
Keep in mind also not being at MTOW will help you get airborne easier.
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Again, why would you drop from the sky? Feathering a prop results in a reduction in drag when compared to a windmilling prop so performance should increase. If you are talking about feathering the prop on a running engine, the of thrust will be zero and hence speed will decrease (still no drop). You should never do this, unless you are flying a free turbine turboprop but then only with power idle.
50 psi? What power indication is that on a turboprop? With propeller feathered it doesn’t matter even if you select 100% power, there won’t be any thrust producedz
Yes all this is conducted with default loads. I’m trying to keep that in mind.
Uh… the manifold pressure? Don’t look at me I don’t work for DeHavilland, I just read the gauges I was given.
And my comment had nothing to do with prop feathering, you’re confusing two conversations in here.
Exactly, serves no purpose. The first few stages of flaps produce a lot if lift with little additional drag. The last few stages produce lots of drag with almost no additional lift.
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MAP on a turboprop?
I’m not actually, the post you were responding to was about 50% power with props feathered.
No, he later clarified when someone pointed out that feathered props produce no thrust that he meant prop levers 100% forward, not feathered at all.
Sorry, you took my comments very literally. Exactly like you said, if you feather the prop thrust will drop and thus airspeed will drop as well. Without airspeed, you’re going to drop out of the sky. I am pretty sure we’re saying the same thing, I just went straight the punchline.
Got it! Thanks.
Weird measurement, torque in pressure. Usually its in percent or ft / lbs. It is often measured by a valve which is moved by twisting of the engine shaft or torque applied to the reduction gearbox metering engine oil pressure. But weird its not converted in some other units.