.Decided to go for a couple of circuits this mornin'. Filled the Challenger with 5Gallons of fuel and pulled out of the hangar. The outside temp was 21 Deg and the wind was light Westernly but swirling between SW and NW and the time was 0730Z. I have 46hours total in my logbook and 10 hours on type.
Did my preflight and strapped in. Just as I was about to start the engine the wind started blowing a wee bit stronger, but not so much that I worried to much though, BUT at that stage I was in doubt if I must take off. And what did my instructor teach me?? When in doubt.... don't fly
. But the Challenger have a 20mph crosswind component and this wind was not nearly 20mph. Started the engine and taxied to holding point and did my checks and looked at the windsock and start taking off. Within less than 30m the Challenger was in the air and climbing like a homesick angel. I turned to the right into the wind and away from the mountain (2-3km on my left) and everything was smooth as butter, although she climbed very faster then normal, but can't say how much for I have no VSI. It felt like the aerie was on a crest of a wave so light was the climb. At 500ft AGL I felt that the air was suddenly very cooler than a few seconds ago. I leveled out on 600ft AGL and start trimming the aerie. The next moment I experienced some turbulent air and the aerie would suddenly rise and then drop again. I have flown in turbulent air before, but the way this turbulence behaved, suddenly didn't look so tame. My hand on the throttle, I reduced the revs to 4900.
The next moment something grabbed the aerie from beneath and shot it straight up into the air for 300ft in what feels like in the wink of an eye
Before I could realize what was happenin', I suddenly shot straight up in my seat although I was strapped in securely and my head hit the trim crank in the roof and the next moment the plane toppled over in a dive straight down. Instinctively I closed the throttle and pulled back on the stick, but the aerie kept on diving, by the time I got out of the dive, I've lost 400ft and my airspeed was 100mph . My cellphone that was in my shirt pocket was lying on the floor and the logbook also. The pen that was with it, was gone. All this happened very, very, very bloody quickly. The air was stable again now and the airfield was less than 400m away, but it looked so far 
and my legs were trembling so much. I was creeping allong to the field and looking for another one of these monsters that attacked me a few seconds ago. BUT, I cant see them and I don't know where they are. The next moment I encounter another quite violent turbulence but not as bad as the big one. I landed as quickly as possible and by now my legs were steady again for I lined the aerie up perfect in the crosswind for the landing.Now for the questions: Was this just turbulence or was it windsheer?
Did I do correct to close the throttle when I toppled over, or would it be better to use the power to
get out of the dive? Remember even with the throttle closed the speed reached the Vne in the dive.
But I don't know if this was really a close call or just a normal experience, but I know I'm glad that I've survived this so that in future I will not fly this time of the year that time of the day when there is similar conditions.
All you guys with years and years of experience, what would you've done in such a situation or would you stayed on the ground.
I can say with all confidence that this experience did not rattle me so much that I am adruptly stopping my flying now. I will definitely be in the air very soon, but preferably when the conditions are 100% for now.
Safe Flyin'
At least in the gyro it wasn't a bad experience, just a bit unexpected only.