RE: Bob Cat Copy Falcon 120 Jet
Hi guys, did a post two days ago, with pics of the tank install (Persil Bottle), but website crashed and it was lost.
Had 6 flights yesterday, had three flame outs, and three normal landings.
The Persil bottle holds 1600 mls not 1700 mls, I qouted before. Cg is better, with the Persil tank full, it requires only 150 gms on tailplane to balance, as opposed to the 2 litre pop bottle with 1700mls of fuel, at 275 mls.
This reduction of fwd shift of the cg , was slightly noticable on take off and was a little noticable in flight, straight after take off and in a turn.
My Jet 1A nose leg (big Boomerang leg not the Intro) performed brilliantly. Had to machine about 10mm off the top of leg, to give me 145mm from top of leg to the axel center. I fitted a RipmaxF-RMX3070 70 mm wheel, which has performed well and at around 6 pounds for two, is excellent value. Wheel is still completely true.. I think this is the part number, as the wheels were packaged wrongly. I fitted a quick make shift spring clip to hold the nose leg centered during retraction, secured with sellotape, it worked perfectly. The nose gear bay plastic moulding, I cut out to allow the 2.75 inch wheel to retract right up into the fuse, so leg goes up 90 degrees. I used the plastic moulded packaging the wheels came in, to form an additional space for the wheel to fit up into, again just sellotaped into position. The nose sticks better to the ground during take off and taxi, and on landing, the model just sits down. The AT main legs performed brilliantly again. I think after my 10 flights and taxiing around, the original gear would have damaged the wing and fuselarge mounts.
I will post up some video of some take offs and landings so you can see how good they are.
After the 3 flame outs, I must say the plane glides beautifully and 2 landings were performed off the landing strip with gear up but no damage at all. Still have to work out the cause of the shut downs, but fuel feed was not the problem, not one air bubble anywhere and UAT was BubbleLess.
With 6.5 mins of flight and taxi back, I still have around 1/2 inch of fuel in tank, will measure how much tomorrow.
Tried a take off with 20mm flap, did not notice any improvement in take off performance.
Airframe is around 14.5 pounds Dry but with full UAT, and fuel and fuel tank weigh 3 lbs 1/2 oz. Engine ( home made) thrust around 12.5 to 13 lbs Tim