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motor upthrust Monolog 400 ep

Old 01-27-2016, 08:49 AM
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Default motor upthrust Monolog 400 ep

just acquired the above model maiden flight last weekend inverted it wants to head to mother earth checked other pics of the model on the net and looks no different to my model a check with digital meter confirms about 2 degrees of up thrust wing is about 1 degree this does not like flying inverted looks like the motor box will have to have some surgery to correct the upthrust
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Old 01-27-2016, 10:48 AM
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Is it this model :

Then I would expect it to have either zero up / down thrust on motor or just a small 1 - 2deg down. I would not expect to see UP thrust on such a machine.

Couple of washers under mount screws should help ?

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Old 01-27-2016, 11:22 AM
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Up thrust relative to what datum?

Using the wing chord line as your datum is the only sensible option on a model such as this. If the wing is 'about' 1 degree and the motor is 'about' 2 degrees.. then that sounds to me like they are 'about' the same (within a degree or less)? .. so 'about' zero up thrust.

Diving strongly when inverted usually points to your CG being too far forward. If it were mine I'd try moving the battery back, re trimming elevator for level upright flight then repeat the inverted test. Keep repeating until you get the inverted behaviour you are after.

nice looking model by the way......
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Old 01-27-2016, 04:09 PM
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Sounds to me like a CG issue.
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