Awesome video. For whatever reason, comprehension of constant speed props has been challenging for me in A&P School. This really made A LOT of things clear for me. Thank you! Question, will you be doing a video for non-feathering constant speed props and how prop blade flyweights work in those systems?
We repair the nozzle shields and combustion liners for C20 and C30. We replace all the parts; deflector, dome, inner band, outer band, saddle tangs, and one boss to call it a repair. We can replace the Hast X with Haynes 230 with our repair. We do the same with the combustion liners. We keep one part like the fuel nozzle or swirler. We built up the nozzle and swirler with weld and CNC to specifications. As good as new and less expensive.
V.N. jan.70 we had the experimental huey C mod.come in from Bell at the605th. With Bell engineers.dual hyd.H.D.cobra head,masive rotors and canted tail boom.Flight tested it in country.
For gyrocopter blade chord is matter? For gyrobee having 210mm chord and 11ft long blade(per blade) but I have 178mm chord and 12.2ft long (per blade) is it ok to use ? Or chord and all to be match?
Great real-world shot of a complex theory. However how does an engine spinning at 5000rpm engage a rotor that's at standstill and start it spinning up without shredding something?
Great question. The turbine wheel that drives the compressor can turn independently of the turbine that drives the rotor. If you watch some startup videos, the engine will start and reach idle speeds , eventually the rotor catches up.
@@MrSkidkickeryes and I’ve even seen some helos that can have their rotors completely stopped while the turbine is at full idle. Then they release the rotor brake and the rotors slowly start spinning. What I don’t understand is how this can be. How does the turbine exert its effort onto the rotor so gently and slowly. Is it it the exhaust air blowing through the compressor that powers it? Or it is some fancy gear? I don’t understand how it’s able to exert enough force for the rotors to lift a helicopter off the ground, while also allowing that same rotor to come to a full stop. Feels like magic
As an Aircraft mechanic back in the 90's I worked with a helicopter crew chief who was in Vietnam, he said in comparison they had very little trouble with the wooden rotor blades of the Bell 47
Cool to see. FYI (unless I missed it)... the feathered position is generally the default for multiengines. For a single engine, the default position is the opposite for max power.
I had a sprag unit fail on a large radio control helicopter in flight, the engine rpm went through the roof but rotor rpm was dropping quickly, I still managed to pull off one of my greatest autorotations of all time. 😀🇦🇺
Just found this video. So....why do all modern gyrocopters use only a 2 blade, large diameter flappy rotor? I would think a smaller diameter 3 blade rotor would be less drag, less stick shake, and less retreating blade factor. I think autogyros are great except for how slow they are. If you really want to GO SOMEWHERE, rather than just fly around at 70kts, you need a machine that can cruise at....maybe 120kts. Why so slow. Do you know?
Gyrocopters are as cheap as possible, so they usually have simple two-blade teetering rotors; some even tilt the rotor rather than using cyclic pitch control.
I love the design always have… So for that reason I've always flown radio controlled helicopters at the moment but the newest one is fully articulated. Most are. But the people that came together to invent all of these things made something really remarkable
I like that balanced head. So even number of blades it is. No droop. As RPM increases, allow for more flapping. What if you actually want to roll or pitch the helicopter? Maybe we need a second swashplate to govern the flapping. Maybe gyro forces absolutely dominate and the fuselage only needs a small torque.. or it just dangles like cargo on a rope.
question, the AStar spin at approx 390 you said, others spin/operate at more like 245, thats a significant different, for a rotor system, be interesting to hear, understand how a rotor system is designed to gravitate to the one or other end of that rpm range.. can't recall which heli the other was other than it's also a 3 blade design,
What helicopter of the same size (and rotor diameter) turns the main rotor at only 245 RPM? Rotor rotational speed is determined by rotor diameter and desired tip speed (typically roughly Mach 0.8).
