XXavier
Member
- Joined
- Nov 13, 2006
- Messages
- 1,482
- Location
- Madrid, Spain
- Aircraft
- ELA R-100 and Magni M24 autogyros
- Total Flight Time
- 913 gyro (June 2023)
Jean Claude;n1127899 said:You make a mistake, Xavier
Remember that in hover, the airflow crosses the disc from the upper side which decreases the angle of attack of the blades. So, with the autorotative pitch setting, of about 3° more the lift 0, it would take 580 rpm just to gives a sufficient induced speed to lift the weight, out the ground effect, and over 650 rpm to climb to 600 ft/mn. The friction of the air on the blades now then absorb most of the power.
True... I was thinking that a moderate increase in RRPM over those necessary in s/l flight would be enough for a 'jump', but the autorotating blades work with a small pitch but a large AoA, due to the incoming wind...