Champion

Experienced athletes share their insights in answering this question:
If you engage the helicopter and the propeller moves but
stalls, feel the starter solenoid and the battery. If they are cold the battery
is most likely bad but if they are not there could be a problem with corrosion
in the electrical system.

How to Identify and Resolve Common Issues ?

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Description. Retreating blade stall is a hazardous and damaging flight condition in helicopters and other rotary wing aircraft, where the rotor blade on the retreating side of the rotor disc in forward flight and therefore with the smaller resultant relative wind exceeds the critical angle of attack.
Helicopters are equipped with freewheeling units which disengage the engine from the rotor system in the event of an engine failure. Any time the geared engine RPM (revolutions per minute) is lower than that of the rotor RPM, the freewheeling unit disengages. Helicopters also have controllable pitch rotor blades.
Flight performance during a retreating blade stall

Recovery involves lowering the collective pitch, relieving forward pressure on the cyclic or more commonly, both. Either of these control movements should restore the proper attached airflow over the retreating blade thus generating lift again.

As the helicopter falls, the resistance from the air pushes the blades up into a slanted position. In this position, the air under one blade is pushing one way and the air under the other blade is pushing the opposite way. These two forces of air push the blades around and make it spin.
It is therefore possible that the propeller can stall if the resultant angle of attack is too large. In the same way, if the angle of attack is too small the propeller will be operating at a low lift coefficient and won`t be able to efficiently produce the thrust and torque required.
There is only one type of stall in a helicopter which is a blade stall, either main rotor or tail rotor.
It is commonly applied to the phenomenon whereby an engine abruptly ceases operating and stops turning. It might be due to not getting enough air, energy, fuel, or electric spark, fuel starvation, a mechanical failure, or in response to a sudden increase in engine load.
The recovery from a stall is quite straightforward. All a pilot must do is push the nose down and roll the wings level if the aircraft is in a bank. This action reduces the angle of attack and reattaches the airflow over the wing.
A stall occurs when the angle of attack of an aerofoil exceeds the value which creates maximum lift as a consequence of airflow across it. This angle varies very little in response to the cross section of the (clean) aerofoil and is typically around 15°.
Generally, the RPM of helicopter rotors is 500 to 600 RPM.
Light inland helicopter is the most accident-prone sector within commercial aviation.
When a helicopter engine fails, the most important thing is to get the collective down and to do so quickly. Rotor RPM is absolutely critical! Once the RPM has dropped below a certain level, it will be impossible to get it back, and the helicopter will indeed crash and burn.
If a stalled aircraft is subjected to a sufficient yaw rate, it will enter a spin. The yaw can be induced by improper use of the rudder or can be a result of the wing drop characteristics of the aircraft in question. In a spin, both wings are in a stalled condition but one wing will be in a deeper stall than the other.
The propeller works by displacing the air pulling it behind itself (the action), this movement of air then results in the aircraft being pushed forward from the resulting pressure difference (the opposite reaction). The more air that is pulled behind the propeller the more thrust or forward propulsion is generated.
a) At least one of the symptoms of the fully developed stall MUST happen before the aeroplane can spin. b) To revise, these symptoms are: • wing drop (undemanded roll); • nose drop; • inability to maintain level flight; and • buffet. these may be augmented by a mechanical stall warning device.
A compressor stall occurs when there is an imbalance between the air flow supply and the airflow demand; in other words, a pressure ratio that is incompatible with the engine RPM. When this occurs, smooth airflow is interrupted and turbulence and pressure fluctuations are created within the turbine.
The most common sensor which can lead to your car stalling is the manifold absolute pressure sensor (MAP) or the mass air flow sensor (MAF). Most cars typically have one or the other.
Manual cars stall when taking off because the drivers releases the clutch too fast (dumping the clutch) and the engine cannot meet the demand and stalls. Stalling the engine in a manual car is NOT bad for the vehicle, so long as it`s not done 8 or 10 times every day.
How to restart the car quickly and safely. When you stall, press the clutch down, gently press the footbrake, check that it`s in first gear and start the car. Make sure it`s safe and drive on. If the car stalls but hasn`t come to a stop, then press the clutch quickly, start the car and providing it`s safe drive on.
Many modern vehicles are designed with several fail-safes to help protect the engine in adverse conditions. One of this is an automatic shutoff when the oil pressure drops to a certain level, or the oil level drops too low (note that this is not true for all cars). This causes the engine to stall and die.
Faulty spark plugs can cause the car to exhibit starting troubles. Worn out plugs does not produce sufficient sparks, which is needed for starting the engine. This results in the engine to stall and fail to start quickly.
A stick shaker is a mechanical device that shakes the control column to warn of the onset of stall. A stick pusher may be installed in association with a stick shaker system in aircraft which are susceptible to the deep stall phenomenon.
Factors such as total weight, load factor, power, and center of gravity location affect stall speed—sometimes significantly. Stall speed increases as weight increases, since wings need to fly at a higher angle of attack to generate enough lift for a given airspeed.
If you start at a location near sea level, I think 3500 feet above ground level would be about my lower limit for practicing stall recovery. I personally feel much more comfortable at 5500 or 6500 AGL. Maybe the terrain around you is higher. I would add some margin if you are above higher terrain.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

When I start my helicopter the propeller moves but stalls, what could be the reason for that?
ANSWER : If you engage the helicopter and the propeller moves but
stalls, feel the starter solenoid and the battery. If they are cold the battery
is most likely bad but if they are not there could be a problem with corrosion
in the electrical system.

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Starting my Mojave 250
ANSWER : I’m having the same problem I guess it popular in mojave I changed the plug and I still get Orange spark is there any ideas it won’t kick start when cold but once warm she runs great and will kick start

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We have a 1967 2 strok mercury 65 outboard motor. wont start cold
ANSWER : Wow.It sounds like some people I know.Late starters.Don,t get out of bed ’till 10 am.With all you have written, a check on the operation of the choke (cold start) would be worth looking at.As you crank the motor,squeeze the fuel bulb at the same time and see if that also may help.Hope this helps

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I have a problem with my machine, on occasion, not recognizing when I’m starting, and the display will not start. I have to remove one of the batteries or it will stay on forever. When it starts up, it works fine, no complaints whatsoever. But lately, I’ve not been able to use it due to the start-up problem. I put the batteries in, the display comes on, but it will not start up when I begin motion. The control buttons will not work, either. Please inform me what it is I can do to fix this problem. Thank You
ANSWER : Troubleshooting on this model is very limited to anyone but the vendor. I would recommend sharing the symptoms with a representative from fitnessquest here.
Good luck

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Mule 610 will not start. Was running fine, plowing snow and it starting acting like it was running out of gas and stalled. Put gas in put it won’t start and acts like it is not getting gas. Could the gas line have frozen due to the depth of the snow?
ANSWER : Did you ever find the fix for your mule?

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Engine stalls out
ANSWER : Sounds like a dirty carb or need to rebuild the carb, adj valves, new plug, do a tune up

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The Bike Technicians Tactic Phase1 An electrical inspection on the bike should produce results. First, the bike battery powers the entire lightening systems mentionable as ignition, meter readings, head lamps, signal indicators. However, the battery provides the power supply to several entities though also significant is the fuse box containing circuit protection coils. Inserting the bike key into the ignition to perform start mode displays the capacity power circuits. A charged battery should display an indication in the meter reading area also known as bike dashboard grading. A malfunctioning start mode on inserting key in ignition may be traceable several locations on the electrical circuits. Attempting to repair the electrical power of the bike usually requires batter power power test kit. The test kit ascertains the battery power making possible progress to the remaining electrical circuits. Test kit also ascertains the fuse box circuit functionality either with fuses still intact or extracted allowing for the next progress level. An observation tour of the bikes electrical wiring kits from battery hold through fuse box compartments to each lightening display area either headlamps, indicators, and meter reading should produce results of any visible damages that may require repairs after the electrical inspection has been performed. Once any faults were observed on the electrical channels, repair mode is the next level. A dull battery either may have been depleted completely of durational capacity requiring another for replacement. Alternately, a depleted power supply due to prolonged storage may require charge functionalities. Usually, a device capacapble of restoring a battery of electrolytes is resorted for charger ability. The type of battery may require constuents either liquid cathode replenishment in the battery entrapment area prior to charging feature is assumed with electrolyte machine. Once the battery has regained full functionality makes way the next repair task. The fuse box may have simply required replacement fuses either as missing or burnt out. A fuse box usually contains additional spare for replacement functionalities. An alternate arrangement at acquiring fuses on the auto mart may replace the burnt devices. The next electrical task is wiring fixtures achievable by mending broken cords with appropriate electrician’s tapes else malfunctions may remain. Alternately, a worn-out electrical wire is replaceable by acquiring the entire extension lengthwise between significant areas. The last remaining electrical units are lightening indicators consisting of bulbs or luminescent displays reflectors. Observe the blub areas either by loosening covers to inspect for observable burnouts else the entire electrical circuitry is ready for functionality observations with separate entities. Engine Technicians Tactic PHASE 2 A bike engine inspection includes observation for indications of malfunction. Any fluid residue is indication of problem areas. Where oil leaks usually requires engine block inspections. A bike engine consists of an entrapment compartment where mechanical combustion takes place. First, the entire observable block consists of an external coating known as engine bloc housing internal component of pistons, rings, and fastens known as cylinder heads. A bike engine has every component embedded within requiring technical expertise to achieve an inspection. Once deciding on the engine task requirements, acquire a tool box with the appropriate componements as first requirement before engine works is commence able. Second, the bike may require an area environment as workshop requirement to attain engine inspections. Third, bike engine are least bulky compared with vehicle engines however assistance would complement the inspection phase. Prior to inspecting the bike engine, a strap mechanism has to be assumed to achieve expert maneuverability also as safe precaution. Unless parts hinder maneuverability at engine locations, the only removable components should be the engine. First, start with disjointing the spark plug cables to acquire accessibility to plugs imbedded on the cylinder heads. The plugs require tools to loosen thereby exposing the combustible area. Once the spark plugs are exposed, two alternatives are likely. First, a spark plug may have gathered rust residue only requiring cleaning to attain regular capacity. The pin area of the spark plug may have been twisted due to overheating and slight melting dislocation. Usually cleaning the residue from old plugs may simply expose the ignitable capacities. However, an observation of twisted plug pin may require twisting back in place to achieve full ignitability once bike engine starts. A bike engine bloc has the pistons as combustibles or blasters of fuel gasoline. The rings perform as strap fasteners whenever the pistons move about combustibility. Usually, the engine entrapment components would have collected residue requiring clearing. Also, pistons together with rings may require replacements either as worn-out due to prolongs tasks or overexerted biker features.
ANSWER : Get to the manufacturer

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