Primus Build Page
This is a build of a Home & Hobby Solutions Primus
The Primus is an updated version of Ed Kazmirski's Taurus
I was so impressed with the build of the Qwic Fly III that I ordered one of Jeff's Primus full kits. Like the Qwic Fly III kit the Primus comes with laser cut parts. As with the Qwic Fly III this will not be a step by step article but will contain supplementary information that may help you with your build.
The first item normally started is the tail. The fin and rudder are solid 1/4" laser cut parts. The parts are cut slightly different than the plans show, but the outline is the same. There is only one joint to glue. The horizontal stab is an all built up structure. Using 3/8" stock the leading edge and trailing edges along with the tips are constructed first then the 3/32 X 3/8 ribs are cut from straight stock and glued into place. The stab is a bit different in that it has a diamond shape when completed. Included are two sets of elevators, a 3/8" set and a 1/4" set if you profile the trailing edge of the horizontal stab.
3-8-07
Sorry, I have not posted anything new for a few weeks. Actually, the Primus went together so fast I didn't want to stop to take photos. I also didn't see any need to suppliment the Primus build write up done by Skip at RC Universe.
http://www.rcuniverse.com/forum/m_4435982/mpage_1/key_PRIMUS/tm.htm
The only change I made was to the wing. I did not like the balsa wing joiner and made a new one from 3/16 ply. I also lowered the amount of dihedral from 5"+ to 2" or 1 inch per wing tip. The way I figured the angle out was to clamp a 36" balsa stick to the brace. At the end of the balsa stick I measured my 1" and did the same for the other side. I simply transferred the angle to the plywood and cut the brace out. Oh, I also extended the brace length to rib #2. The supplied brace only goes half way. I still glassed the center section as recommended. I did also change the leading edge. I used the supplied materials but added a 3/4 X 3/4 Tri stock to the mix. It was much easier to round the Tri stock and gave a much better profile to the leading edge. I used hard Tri stock so it would reduce the amount of dents and hangar rash.
The entire airframe is built, equipment installed and removed, and the airframe is being prepped for covering tonight.