For me learning something new when taking on a new project is always a thrill. I have been reading about a simple rubber powered free flight model known as the Blue Ridge Special that uses a more advanced construction technique that creates a very rigid structure. One person had referred to this as “Union Jack” construction, my search for this brought up mainly information on the official flag of the UK which is known by the same term. The angled lines in the flag do have the look of a pattern of diagonal and crossing horizontal lines like you see in the wing structure. Diagonal ribs connected to a spar through the wing make for a wing that is very rigid. Tail surfaces also have diagonal bracing.
The price for the kit of the Blue Ridge Special is reasonable but it appears that it is not available right now as a note on the Pal Model Products website indicates they are busy working on products. I was able to find plans that were similar to the kit and used hobby shop balsa so my plane might be slightly heavier than the kit, weight was 11.32 grams without rubber.
If you have built other simple rubber models of this size you might be wondering if more advanced construction technique is really necessary. This type of construction is normally seen in higher-powered glow or electric free flight models that scream skyward which can cause wings to flutter. What I have noticed is that my plane as well as the Blue Ridge Special planes other people have built flew perfect from the start with no trim adjustments needed. I have to believe that with this method of construction it is easier to build an airframe with no warps.
The airplane has only been out for one flying session so far but it flew very well. Most of the flights were with 3/32” rubber using a 6” diameter propeller. It was rather windy and I sure did not want lose the new plane so I did not use anywhere near maximum winds in the rubber. The airplane climbed but not steep, I tried 1/8” rubber with even fewer turns and the climb was steeper. I am really anxious to try more winds on a calm day and see what this airplane can do.
Blue Ridge Models Website
Thread on Hip Pocket Forum About Blue Ridge Special