RCU Forums - View Single Post - Plane Measurements (neg Gs / down elevator loop part trois)
Old 09-06-2014 | 01:45 PM
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learn2turn
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From: Medfield, MA
Default Plane Measurements (neg Gs / down elevator loop part trois)

One of the suggestions in the other threads is to check set up. Did some measurements on my plane. This was simply with a metric ruler and a CG stand as I don't have an incidence meter (but I can do trigonometry.)

Span: 1470mm
Wing Area; 0.35535m
Weight: 2.934Kg (6 lbs 7 1/2 oz)

I don't know if that's heavy for a plane that size or not. It does feel heavy at times even though I have enough power for unlimited vertical.

CG: near as I can tell, I've been flying it at about 29% of MAC. If I move the lipo pack back 1cm, I should be able to get it to 30% and if I move it 2cm, it should be about 31%. More than that and I'd have to reroute some stuff. I may try those settings next time I fly and see if it feels different. (It took me a huge amount of measuring what I hope is close to an accurate measurement. I thought I had all the calculations done on a wing panel and started using that but then realized that the taper in the fuse increased the sweep and I had to take that into account and redo all the calculations.)

Wing Incidence: +1.85degrees. I calculated that by taking the inverse sign of an 11mm height difference over a 341mmm chord. The plane does not have adjusters so changing that would involve surgery to the alignment tab slots.

The motor box I did not measure but I know it came stock with 2-3degrees of right and maybe 1 degree of down. I'd have to look it up.


If any one cares to comment on how that setup would affect flight characteristics, have it at, I'm all ears.

-l2t aka Ken