BNF UMX Pitts S-1S User Manual (English)

Questions and Answers:

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mary66Jul 26, 2025
Why is my BNF UMX Pitts S-1S Toy aircraft not responding to throttle?
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  Ray AndersonJul 27, 2025
  If your BNF Toy aircraft isn't responding to the throttle but responds to other controls, it might be due to several reasons. First, ensure that the throttle stick and trim are at their lowest settings by resetting the controls. Another potential cause is a reversed throttle channel, which can be fixed by reversing the throttle channel on the transmitter. Finally, check if the motor is properly connected to the receiver by opening the fuselage and verifying the connection.
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Brandon FranklinJul 31, 2025
What to do if my BNF UMX Pitts S-1S Toy has reduced flight time?
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  Mary AndersonJul 31, 2025
  If your BNF Toy is experiencing reduced flight time or seems underpowered, there are several possible reasons. First, ensure that the flight battery is fully charged. If the battery is low, completely recharge it. Another common issue is the propeller being installed backward; make sure the propeller is installed with the numbers facing forward. Also, a damaged flight battery could be the cause, so replace it if necessary, following the battery instructions. Cold flight conditions or a battery capacity too low for the conditions could also be factors; ensure the battery is warm before use or replace it with a larger capacity battery.
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Sarah JacksonAug 3, 2025
How to fix extra noise or vibration in BNF UMX Pitts S-1S Toy propeller?
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  sean46Aug 4, 2025
  If you notice extra propeller noise or vibration in your BNF Toy, it could be due to a damaged propeller, spinner, or motor, in which case you should replace the damaged parts. A loose prop screw can also cause this issue, so try tightening it. Additionally, an out-of-balance propeller can lead to noise and vibration; remove the propeller and balance it, or replace it with a balanced one.
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Michael HicksAug 8, 2025
What to do if BNF UMX Pitts S-1S Toy model flies inconsistently?
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  Kimberly SantosAug 8, 2025
  If your BNF Toy model flies inconsistently from flight to flight, it could be because the aircraft was not kept immobile for 5 seconds after plugging in the battery; ensure you keep it still for that duration. Another cause might be trims moved too far from the neutral position; neutralize the trims and mechanically adjust the linkages to center the control surfaces.
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Sarah KingAug 12, 2025
How to resolve BNF UMX Pitts S-1S control surfaces not neutral?
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  Jason BeckAug 13, 2025
  If the control surfaces of your BNF Toy are not at the neutral position when the transmitter controls are at neutral, it may be because the control surfaces were not mechanically centered from the factory. To fix this, center the control surfaces mechanically by adjusting the U-bends on the control linkages. Another possible reason is that the aircraft was moved after the flight battery was connected and before the sensors initialized. To resolve this, disconnect and reconnect the flight battery while keeping the aircraft still for 5 seconds.
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John MccoyAug 17, 2025
Why BNF UMX Pitts S-1S controls oscillate in flight?
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  Jennifer LaneAug 17, 2025
  If the controls of your BNF Toy oscillate in flight, causing the model to rapidly jump or move, it could be due to an unbalanced propeller causing excessive vibration. Remove the propeller and rebalance it, or replace it if damaged. Another possible cause is a loose prop screw, which also causes vibration. Try tightening the prop screw.