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All propellers spin but it flips over when trying to fly?
This would be clockwise and/or counter clockwise propellers on the wrong motor(s). For copters with an even number of propellers, each propeller turns the opposite direction from the ones on either side of it. The reason for this is so the combined engine torque is in equilibrium. Unbalancing this equilibrium is what allows the craft to turn left or right without a rudder or tail rotor.
Regardless of spin direction all propellers must blow air downwards.
Leave aside all the puffery about 3-1 and such, you described a front wheel drive (pull) walk-behind (FWD), but are asking why the rear wheels won't propel. When you push down the hand grip the front wheels should spin free. Whan you lower from wheels by releasing pressure on hand grips, turning wheels lowered to ground should propel the mower along with its unpowered rear wheels now turning be ground contact. Reminder, never, ever lift rear drive wheels of any mower off the ground while walking behind with engine running:
You could be struck by blade propelled object.
You could pull mower and spinning blade backward onto your feet.
You could lose balance and be pulled forward in a fall.
Contemporary FWD mowers are recognized by a black chain housing on deck top leading from engine to left front of deck. RWD propelling chains are situated underneath deck so cannot be seen from above.
All propellers spin but it flips over when trying to fly?
This would be clockwise and/or counter clockwise propellers on the wrong motor(s). For copters with an even number of propellers, each propeller turns the opposite direction from the ones on either side of it. The reason for this is so the combined engine torque is in equilibrium. Unbalancing this equilibrium is what allows the craft to turn left or right without a rudder or tail rotor.
Regardless of spin direction all propellers must blow air downwards.
Those propellors have individual drives. They both have to spin at the same speed also.. So if one spins and the other does not, that is what you are having problems with. Check the shaft on the top propeller where it connects to the gear at the motor.
The mower's drive shaft may need to be lubricated. If you turn the mower over and try to move the blade by hand (with the mower off, of course) does it move, or is it hard to move? If it's hard to move or it won't move at all, lubricate the shaft by squirting some WD-40, 3-In-1, or other lubricating oil onto the drive shaft where it meets the chassis of the mower. Squirt enough oil to cover the circumference of the drive shaft, then try to spin the blade again. It should at least spin a little bit now. Squirt some more oil and spin the blade again, until the blade spins easily. Then turn the mower back over and try to pull the start cord -- it should pull normally now.
Please check the connection of the axle of the upper propeller. Turn the heli upside down and spin the upper propeller manually, try to see if the gear turns if not there is a loose connection. You will find 2 small screws near the gear, unscrew one of them and push the axle then back in place, tighten the loosened screws. Turn the upper proppeller manualy, a few turns will do ansd see if the gear turns simultaneously with the propeller. If it still does not turn, apply a permanent glue to the gear and the axle. This will sure have your heli on flight.
Spinning is caused by one of the main propellers rotating faster than the other. If both propellers are secured tightly to their drive shafts, the spin control knob on the remote control can be used to stop the spin. However, if one prop is slipping with respect to the other, the spin control knob will not fix the problem.
I've found that the set screws holding the propellers to the drive shafts tend to loosen after a while. If one prop is a bit loose and the other is tight, the relative slippage will cause the helicopter to spin.
To check, turn off helicopter power and manually rotate each propeller separately, watching the nylon gears in the body. If the propeller is moving and its drive shaft gear isn't, the propeller is slipping because its set screws are not applying enough pressure on the propeller's drive shaft.
Carefully tighten the set screw and the problem should be fixed. DON'T OVERTIGHTEN, or the plastic threads for the set screw will be stripped and the propeller assembly will be ruined.
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