zkvii
Well Known Member
Hi,
Last week I did some spin testing on VII (RV 7A - large rudder) as part of the later stages of flight testing. I've been comfortable with the stall / power on / off / bank etc for a while and slowly worked up with 1/2 turn, 1 turn, 1.5 turn and 2 turn spins. First observation which I was expecting from the reading was 2 turns starts to really wind up - quite 'exciting' . That said it all did what it was meant to and responded nicely to standard recovery.
A short video of the stalls / spins - http://www.youtube.com/watch?v=xVMWKFI9gb4 - excuse the lack of music / my chatting - it was for flight testing!
I'm initiating with full aft elevator and full left boot at 60 kts in a slight nose up attitude. 1 turn seems to be about 400 feet.
Yesterday I also did some more .5 and 1 turn with more foreward CofG ( 1428lbs @ 81") . It seems to my limited experience to swing through even further to quite an 'inverted' position - is this others experiece too? The swing through is more than I was expecting.
As an alternative - if you have google earth installed ( http://earth.google.com ) a mini animation clip at 10msec is available at http://www.rvproject.gen.nz/kml/ZK-VII_2turn_spin.kmz - this shows nicely the attitude changes.
Hope to get feedback from others experience - particually the initial 'inverted / on the back' attitude before I start moving the CofG further aft towards the aeros aft limit.
Regards,
Carl
Last week I did some spin testing on VII (RV 7A - large rudder) as part of the later stages of flight testing. I've been comfortable with the stall / power on / off / bank etc for a while and slowly worked up with 1/2 turn, 1 turn, 1.5 turn and 2 turn spins. First observation which I was expecting from the reading was 2 turns starts to really wind up - quite 'exciting' . That said it all did what it was meant to and responded nicely to standard recovery.
A short video of the stalls / spins - http://www.youtube.com/watch?v=xVMWKFI9gb4 - excuse the lack of music / my chatting - it was for flight testing!
I'm initiating with full aft elevator and full left boot at 60 kts in a slight nose up attitude. 1 turn seems to be about 400 feet.
Yesterday I also did some more .5 and 1 turn with more foreward CofG ( 1428lbs @ 81") . It seems to my limited experience to swing through even further to quite an 'inverted' position - is this others experiece too? The swing through is more than I was expecting.
As an alternative - if you have google earth installed ( http://earth.google.com ) a mini animation clip at 10msec is available at http://www.rvproject.gen.nz/kml/ZK-VII_2turn_spin.kmz - this shows nicely the attitude changes.
Hope to get feedback from others experience - particually the initial 'inverted / on the back' attitude before I start moving the CofG further aft towards the aeros aft limit.
Regards,
Carl