How to Troubleshoot Rotor Blade Problems With Your Micro Mosquito or Firefly Indoor RC Helicopter

If the Micro Mosquito or Firefly will not fly there may be a problem with the rotor blades. Use the simple steps below to troubleshoot possible causes. We hope you can find the solution. If your rotor blades are broken we sell replacement Micro Mosquito & Firefly rotor blades. Order online or by phone: 1-800-979-9794 / 306-955-9907.

1. Ensure that when the rotor blades spin they are rotating in opposite directions. If they both rotate in the same direction, it won’t fly. If this is the case, make sure that the upper large gear only meshes with the upper small motor gear, and that the lower large gear only meshes lower small motor gear.
2. Check that the lower rotor is the one with the two notches in the bottom of its stem, and that those two notches interlock fully with the notches on the top of the large gear.
3. Ensure that the blades are on the right way, and that the trailing edge of the blades curve down. If the trailing edge of the blades curve up remove the rotor, flip it over, and re-install.
4. Check for excessive free play in the main shaft by gently tugging up and down on the top of the shaft while holding the body of the mosquito. If it moves up and down more than 1/32″ (0.8mm) then press the large lower gear down on the shaft while pushing up on the cap on the bottom of the shaft until this free play is reduced, but do not eliminate it entirely. If there is no free play at all, or the shaft does not spin freely, increase the free play by pulling up on the large lower gear.
5. Check for free play in the spacer between the two blades by gently sliding it up and down while holding the shaft. If there is more than 1/32″ (0.8mm) of free play, press the transparent retainer at the top of the shaft down until this free play is reduced, but do not eliminate it entirely. If there is no free play at all, or the spacer can not be rotated with out resistance while the shaft is held stationary, increase the free play by pulling up on the transparent retainer at the top of the shaft.
6. The trailing edge of the blades normally curve down. If they have flattened out over time, they may need to be gently re-curved by hand, in order for them to provide enough lift.
7. Over time, friction may cause the build up of powdered plastic where the main shaft goes through the large upper gear, the lower rotor, and the spacer. Removing these parts and cleaning them by passing a small pipe cleaner or a very small rolled up strip of paper towel can improve flight performance.
8. If the helicopter will fly but is not stable, ensure that the four metal pins that make up the pivot points of the universal joint at the center hub of each of the two rotors are all present. If any of the pins are missing, replace the rotor.

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