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Jun 21, 2019, 12:25 PM
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Quote:
Originally Posted by birdofplay
IS the Prop on BACKWARDS ?

very low efficiency from backward facing props.

A Pic would help in our quest for a solution here.
I'm pretty sure the prop is on the right way, it does pull forward slightly and I've measured the thrust with scales.
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Jun 21, 2019, 12:27 PM
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Thread OP
Quote:
Originally Posted by EvanM
Here is a quick test to verify the low trust, when you hold the wing nose up and run the throttle up to a point where it is weightless, that is the 1:1 thrust ratio (hopefully about 3/4 throttle). If you get to full throttle before it is weightless, that will confirm the low thrust value.

Also, please confirm that the prop is 6 inches from tip to tip. I agree a picture or two at this point would help.
I've just posted some pictures, I also put the wing nose down on some scales, zerod them and then put it to full thrust. That's where I got the 200 grams figure. That method should be somewhat accurate.
Jun 21, 2019, 12:43 PM
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Prop is backwards.
Jun 21, 2019, 12:57 PM
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Thread OP
Quote:
Originally Posted by EvanM
Prop is backwards.

I think you are right, I thought the writing was meant to face away from the motor?
Jun 21, 2019, 02:31 PM
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Markings go in the direction of flight. A common mistake that I have made myself on multiple occasions. How is the thrust now?
Jun 21, 2019, 02:54 PM
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birdofplay's Avatar
Obviously WRONG prop direction, sorry !
13K posts vs 9 wins every time ! ;>}

You will be amazed at the difference !
Last edited by birdofplay; Jun 21, 2019 at 03:07 PM.
Jun 21, 2019, 04:49 PM
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Thread OP
Quote:
Originally Posted by birdofplay
Obviously WRONG prop direction, sorry !
13K posts vs 9 wins every time ! ;>}

You will be amazed at the difference !
The only reason I didn't check is because I thought it would reverse the thrust for some reason. Newb error.
Jun 21, 2019, 04:53 PM
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Thread OP
Quote:
Originally Posted by EvanM
Markings go in the direction of flight. A common mistake that I have made myself on multiple occasions. How is the thrust now?
It's almost too powerful. Thanks for your help anyhow.
Apr 17, 2021, 06:19 AM
Registered User

AR Wing 900 - correct CG??


Hi all,

I also have an AR Wing 900 and am currently balancing the CG. Must say that this is very tricky: move a millimeter inside the CG mark and the plane tilts immediately - with the good old finger method I do not get along here! How did you manage it? Slightly nose-heavy or rather tail-heavy?
Apr 17, 2021, 10:38 AM
Registered User
I weighted mine so it is slightly nose heavy. I do this for all my wings.


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