All, as I'm sure you are aware, a small percentage of 90mm F-18 had problems without explanation. While this was a small number of planes relative to the number sold, Motion RC and Freewing were very concerned and have been looking into a possible cause. We found two causes: 1) Elevator servo wires with stripped insulation, 2) Not enough glue on the Elevator mounting plate.
In a nutshell, some planes did not have enough glue on the plastic mounting plate which holds the elevator pivot rod and elevator servos. If there is not enough glue on the mounting plate, the mounting plate can pull away from the foam at the elevator pivot rod which in turn throws off the servo geometry. As little as 3mm of movement in the mounting plate can stall the elevator servo, strip it, or bind the elevator. This is very easy to check and add glue if necessary. As I'm sure you can imagine all future planes will have this addressed at the factory. Please check BOTH of your F-18 elevator mounting plates and add a little glue if necessary to make sure the mounting plates are secure. Both pictures below show too much movement.
This is all explained in detail in a TSB written by Motion RC and Freewing which can be found here: https://www.motionrc.com/pages/produ...f-a-18c-hornet
We've also made a video explaining the problem and what to look for:
In a nutshell, some planes did not have enough glue on the plastic mounting plate which holds the elevator pivot rod and elevator servos. If there is not enough glue on the mounting plate, the mounting plate can pull away from the foam at the elevator pivot rod which in turn throws off the servo geometry. As little as 3mm of movement in the mounting plate can stall the elevator servo, strip it, or bind the elevator. This is very easy to check and add glue if necessary. As I'm sure you can imagine all future planes will have this addressed at the factory. Please check BOTH of your F-18 elevator mounting plates and add a little glue if necessary to make sure the mounting plates are secure. Both pictures below show too much movement.
This is all explained in detail in a TSB written by Motion RC and Freewing which can be found here: https://www.motionrc.com/pages/produ...f-a-18c-hornet
We've also made a video explaining the problem and what to look for:
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