|Mar 23, 2012, 10:52 PM|
ST Cessna 350 Engine Mount Failure.
After several flights over the last few weeks without any problems then last week the cheap plastic engine mounting supplied by the manufacturer failed in flight. This caused the motor and propeller to depart the aircraft. With only the three wires from the ESC holding the motor to the model. (see picture)
After the emergency landing the damaged caused by the propeller to the front of the model was very obvious. The spinning prop had just carved away at the foam. There was no way I could fix this at the field so the 350 was retired to the back of the car.
Inspection of the damage and the twisted cables showed lots of breaks in the continuity and insulation of the wires from the ESC to the motor. Testing the motor proved that it was no longer a reliable option as a power plant.
I ordered a Turnigy Park 480 1320KV motor from HobbyKing.com and in just three days it was in my mail box. I teamed this up with the 45 Amp speed controller and a new 9 x 6 two blade propeller.
Slight modifications were needed to the metal engine mount to make the Park 480 fit. The cowling closed over the new motor without any issues. The damaged to the airframe was repaired with some CA, scrap foam and carbon rods.
The next day the weather was perfect so out to the field at Barden Ridge for the test flight. After the pre-flight inspections and checks a fully charged 3S 1800mAh 40C battery loaded and connected. The 350 was placed on the grass runway into the wind. With full power the little Cessna travelled about 6 metres and leaped into the sky climbing out like a rocket ship!
With the Park 480, ESC & Prop combination the 350 has been transformed from a slow potter about the sky model in to a real sports flyer. It will climb vertically until it is just a dot in the sky, Rolls and loops, is very fast at ¾ throttle and will slow to a walking pace for landing.
I have flown the model every day this week and it has not missed a beat of had any other issues to date.
Obviously the motor supplied with the model is not anywhere near the rated 1320Kv stated by the manufacturer. The plastic parts in the mounting fail very quickly after just a few flights. This little Cessna has a great airframe and is a great flyer. It is a shame that ST Models use cheap rubbish parts to complete what is otherwise a great model.
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