SMALL - SMALL - Telemetry SMALL - Radio
Thread Tools
Old May 09, 2006, 06:07 PM
Moscow Pennsylvania
Joined Jun 2004
66 Posts
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.
glowfuel is offline Find More Posts by glowfuel
Reply With Quote
Sign up now
to remove ads between posts
Old May 09, 2006, 06:29 PM
Registered User
WhenPigsFly's Avatar
Joined Mar 2006
134 Posts
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
WhenPigsFly is offline Find More Posts by WhenPigsFly
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Great Planes Spectra ARF Sailplane glowfuel Electric Motor Design and Construction 3 Jun 28, 2007 02:03 PM
Discussion Great Planes Spectra ARF Sailplane glowfuel Sailplane Talk 32 Jun 18, 2006 09:58 AM
E-Flite Ascent vs Great Planes Spectra ARF ? Hovertime Electric Sailplanes 6 Apr 22, 2004 12:14 AM
Great Planes FLING ARF SAILPLANE COMING SOON! AMCross Product Announcements 0 Apr 17, 2004 07:04 AM
FS-Great Planes Spectra Sailplane ArtJ Aircraft - Electric - Airplanes (FS/W) 2 Sep 16, 2002 04:07 PM