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BNF UMX Pitts S-1S - User Manual

BNF UMX Pitts S-1S
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Instruction Manual
UMX
™
Pitts
®
S-1S

Table of Contents

Questions and Answers

  • M
    mary66Jul 26, 2025
    Why is my BNF UMX Pitts S-1S Toy aircraft not responding to throttle?
    • R
      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.
  • B
    Brandon FranklinJul 31, 2025
    What to do if my BNF UMX Pitts S-1S Toy has reduced flight time?
    • M
      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.
  • S
    Sarah JacksonAug 3, 2025
    How to fix extra noise or vibration in BNF UMX Pitts S-1S Toy propeller?
    • S
      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.
  • M
    Michael HicksAug 8, 2025
    What to do if BNF UMX Pitts S-1S Toy model flies inconsistently?
    • K
      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.
  • S
    Sarah KingAug 12, 2025
    How to resolve BNF UMX Pitts S-1S control surfaces not neutral?
    • J
      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.
  • J
    John MccoyAug 17, 2025
    Why BNF UMX Pitts S-1S controls oscillate in flight?
    • J
      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.
  • N
    Natasha PerryNov 20, 2025
    What to do if LED flashes on BNF Toy receiver?
    • R
      Rick Carey Jr.Nov 20, 2025
      If the LED on the receiver of your BNF Toy flashes and the aircraft will not bind to the transmitter during binding, it could be because the transmitter is too near the aircraft during the binding process. Power off the transmitter, move it further away from the aircraft, disconnect and reconnect the flight battery to the aircraft, and then follow the binding instructions. Another cause could be that the bind switch or button was not held long enough during the bind process. Power off the transmitter and repeat the bind process, holding the transmitter bind button or switch until the receiver is bound. Finally, the aircraft or transmitter might be too close to a large metal object, wireless source, or another transmitter. Move the aircraft and transmitter to another location and attempt bi...

Summary

Preflight Setup and Operation

Preflight Checklist

List of checks to perform before flying the aircraft.

AS3 X Stabilization System

Explanation of the AS3X system's performance benefits for flight control.

Low Voltage Cutoff (LVC)

Details on the LVC feature protecting the flight battery from over-discharge.

Transmitter and Receiver Binding

Aircraft Arming and Configuration

ESC;Receiver Arming

Procedure for arming the ESC/receiver after binding.

Battery Installation

Steps for installing the flight battery correctly.

Center of Gravity (CG)

Guidance on measuring and setting the aircraft's center of gravity.

Control Surfaces and Tuning

Control Direction Test

Procedure to verify correct control surface movement and direction.

Control Centering

Ensuring flight control surfaces are centered for optimal performance.

Control Horn Settings

Factory settings for control horns and adjustment options for desired response.

Dual Rates

Recommended dual rate settings for flight performance tuning.

Flight Procedures and Maintenance

Flying Tips and Repairs

Guidance on safe flying locations, takeoff, landing, and basic repairs.

Post Flight Checklist

Essential steps to follow after completing a flight for safety and battery care.

Power Components Service

Troubleshooting Guide

Warranty and Support

Limited Warranty

Details on what the product warranty covers and does not cover.

Warranty Services

Information on obtaining warranty support, assistance, and service.

Compliance Information

Declaration of Conformity

Declaration of Conformity according to ISO/IEC 17050-1 for product EFLU5250.

Instructions for WEEE Disposal

Guidance for users in the EU on proper disposal of waste electrical equipment.

Parts and Accessories

Replacement Parts

List of available replacement parts for the aircraft.

Optional Parts and Accessories

List of optional parts and accessories for customization.

BNF UMX Pitts S-1S Specifications

General IconGeneral
Motor Size8.5mm Coreless
Approximate Assembly TimeLess than 1 Hour
Experience LevelIntermediate
Is Assembly RequiredNo
Channels4
Skill LevelIntermediate
Recommended Battery1S 3.7V 150mAh LiPo
Recommended EnvironmentOutdoor
Power SystemElectric
Servos4x linear long throw servos

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