|
First we made a trial with two JetCat P-160 (16 kg thrust each), and with this two engines we could lift the Blanik with full weight ca 500 kg 0,6-0,8 m/sek. But these engines were not reliable so we changed them to two JetCat P-200 (22 kg thrust each).
We have made several self-launching starts with a take-off weight of 470 kg (on tarmac) with these two engines.
We were in the air after 300m and the climb was 1-1,5 m/sec. We climbed up to 1000 m in 15 min from take-off. The fuel consumption for this was about 22 litr Jet A1
With these flights we found out that the speed for best climbing of the Blanik is 110-120 km/h. The speed for best L/D (without engines) is 82 km/h only. It's not so easy to come to this conclusion because you normally think that the best L/D is the range for best climbing with the engines on full power.
We also have calculated that a single seater will have a speed at about 200 km/h with only one P-200 (full power).
With this speed you can easily reach the homefield most of your flights.
We also have had discussions about the noise and we think that it's not any problem if you are above 3-400 m (The noise from any Piper or other aircraft is more disturbing)
The starting process for the jet engine is very simple and very reliable, in principle you only push one button.
The fuel consumption is very high but we think that is not a problem because it can be much more expensive to make an out landing.
|
