RE: Bob Cat Copy Falcon 120 Jet
Yes guys this a Falacon website and some guys have made sterling progress making some components to enhance the basic model, like canopies undercarriages and fuel tanks. Regarding fuel tanks, it is sensible to try to postion the tank as close to the CofG as poss, but this is awkward, due to the shape of fuse and the two spars.
I originally flew with a 2 liter coke bottle, which is longer and thinner than my prefered tank now, which is a persil bottle, shorter and taller. There is a slight difference in the models feel when full of fuel, with the two different tanks, but the model flys so well that it is not appreciable. I also have a smoke tank, which i could only fit in front of the fuel tank, so again, a large shift in C/G when this is full, again the model takes it in its stride. There are a lot of differnet configurations of Falcon out there and as long as we keep posting our results, then we can all learn. Some guys have modified spars, which is great, post up your findings, my engine (home made) is heavier than comercial so my plane will be slightly more loaded than others, but i have not modded the internal structure of the wing. I use a carbon rear spar and the ally front one, both extended by 1 inch for correct fitment. I have not experienced any fluuter or deforation of the wing structure, but i do not push the model to extremes. I have around 200 flights on the same spars.
The booms on the later model, did not quite fit up snuggly against the Trailing Edge of the wing, as the old model booms did, so i filled the gap with scrap balsa and also fitted a thin strengthening plate of balsa in this area. I posted quite some time ago, the differences betwwen the models. If you are just starting out on your new jet adventure, rest assured the model is a pleasure to fly, will fly on relatively modest power and is very forgiving. Do the basics and get her in the air, the best tips here, are keep a nose high attitude when she is sitting on the ground (no slip stream air with a jet) to get her off the ground, or you will driving around the field at a fast rate of knots and not flying. I made this mistake as have others. The fuel tank postion is not a major issue, fit a pop bottle, get some air time then play with it to tune it as you like. A trailing link U/C is a really good mod, but i flew mine first with just spring wire and foam wheels. I actually found a video of my very frist flight yesterday, made me laugh. I had so many years work in the engine alone, i would have been heart broken if she didnt fly. Even if it did, woould the engine flame out in flight with different angles attack, how long would the fuel last. In fact i set the throttle at about 1/2 way and flew for about 7 mins hardly touching the throttle, in case she stopped. 90 degree stiff cross wind as well, but got her down. Typing this i still have a grin on my face, its what it is all about, Get Em Up There!