Great Planes Spectra ARF Sailplane - RC Groups
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May 09, 2006, 07:07 PM

Great Planes Spectra ARF Sailplane

Put together a GP Spectra ARF.

Placed a MA 3.5:1 gearbox on the nose and 12x8 folding prop as well. Rest of airplane is stock and balanced in the midpoint of the recommended CG.

Question is there appears to be, after mounting the gearbox and prop, an extra degree or two of down thrust, when compared to the angle of the firewall.

Should this be corrected prior to first flight or will be ok?

Am a bit concerned, especially at take-off.

Thanks in advance.
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May 09, 2006, 07:29 PM
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WhenPigsFly's Avatar
I built this plane several years ago and it is a very forgiving plane that still flies pretty well. I would not worry about the extra degree of downthrust. Just make sure you first toss the plane with no power to see how she flies. After that try it with just enough power to maintain altitude and see how it response. Then decide if the down-thrust is too much or not. Bottom line don't give it full throttle at first and go fly

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