OBIO
May 1st, 2011, 19:21
I am having issues with the freeware Alphasim Jag...namely I can not land the plane without it developing fatal bouncing. Even after gentle, shallow approach landings of 145knots, with very very gentle wheel touch downs.....the plane starts bouncing and keeps bouncing until the gear fails and I get a crash.
I did some contact point location changes....they were 2 feet ahead of the actual tire locations. I made NO changes to the dampening and compression ratios whatsoever. I did add the scrape points. I also added contact points for the inner tires on the main gear...but I have them commented out....with or without the inner tires, the plane bounces just the same. Others have commented that they have no issues landing this bird. Warhorse47 (I think) stated that he also had the bouncies. Could one of you gurus take a look at the contact points and tell me how to put a bra on this girl to reduce the unlovely bouncing?
[contact_points]
static_pitch = 1.6
static_cg_height = 8.2
tailwheel_lock = 0
gear_system_type = 1
max_number_of_points = 9
point.0 = 1, 11.5026, 0, -8.55, 2500, 0, 1, 25, 0.11, 3, 0.8, 6, 4, 0, 260, 300 //front gear
point.1 = 1, -7.42, -4.5998, -8.1166, 2500, 1, 1.2, 0, 0.5, 2.5, 0.85, 5, 7, 2, 260, 300 //left out tire
point.2 = 1, -7.42, -3.3, -8.1166, 2500, 1, 1.2, 0, 0.5, 2.5, 0.85, 5, 7, 2, 260, 300 //left inner tire
point.3 = 1, -7.42, 4.5998, -8.1166, 2500, 2, 1.2, 0, 0.5, 2.5, 0.85, 7, 5, 3, 260, 300 //right out tire
point.4 = 1, -7.42, 3.3, -8.1166, 2500, 2, 1.2, 0, 0.5, 2.5, 0.85, 7, 5, 3, 260, 300 //right inner tire
point.5 = 2, -12.128, -14.158, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0 //left wing scrape
point.6 = 2, -12.128, 14.306, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0 //right wing scrape
point.7 = 2, -18.275, 0, -3.298, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0 //tail scrape
point.8 = 2, 23.092, 0, -3.465, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0 //nose scrape
I got it! Tweaked the static compression and the dampening ratio (I think those are the ones I tweaked) and the bird lands great now. 3 nice landings in a row....then I did a hard landing and had a few bounces, which were to be expected, but the bird settled down nicely.
[contact_points]
static_pitch = 1.6
static_cg_height = 8.2
tailwheel_lock = 0
gear_system_type = 1
max_number_of_points = 7
point.0 = 1, 11.5026, 0, -8.55, 2500, 0, 1, 25, 0.35, 3, 0.8, 6, 4, 0, 260, 300
point.1 = 1, -7.42, -4.5998, -8.1166, 2500, 1, 1.2, 0, 0.75, 2.5, 0.85, 5, 7, 2, 260, 300
point.2 = 1, -7.42, 4.5998, -8.1166, 2500, 2, 1.2, 0, 0.75, 2.5, 0.85, 7, 5, 3, 260, 300
point.3 = 2, -12.128, -14.158, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0
point.4 = 2, -12.128, 14.306, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0
point.5 = 2, -18.275, 0, -3.298, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0
point.6 = 2, 23.092, 0, -3.465, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
OBIO
I did some contact point location changes....they were 2 feet ahead of the actual tire locations. I made NO changes to the dampening and compression ratios whatsoever. I did add the scrape points. I also added contact points for the inner tires on the main gear...but I have them commented out....with or without the inner tires, the plane bounces just the same. Others have commented that they have no issues landing this bird. Warhorse47 (I think) stated that he also had the bouncies. Could one of you gurus take a look at the contact points and tell me how to put a bra on this girl to reduce the unlovely bouncing?
[contact_points]
static_pitch = 1.6
static_cg_height = 8.2
tailwheel_lock = 0
gear_system_type = 1
max_number_of_points = 9
point.0 = 1, 11.5026, 0, -8.55, 2500, 0, 1, 25, 0.11, 3, 0.8, 6, 4, 0, 260, 300 //front gear
point.1 = 1, -7.42, -4.5998, -8.1166, 2500, 1, 1.2, 0, 0.5, 2.5, 0.85, 5, 7, 2, 260, 300 //left out tire
point.2 = 1, -7.42, -3.3, -8.1166, 2500, 1, 1.2, 0, 0.5, 2.5, 0.85, 5, 7, 2, 260, 300 //left inner tire
point.3 = 1, -7.42, 4.5998, -8.1166, 2500, 2, 1.2, 0, 0.5, 2.5, 0.85, 7, 5, 3, 260, 300 //right out tire
point.4 = 1, -7.42, 3.3, -8.1166, 2500, 2, 1.2, 0, 0.5, 2.5, 0.85, 7, 5, 3, 260, 300 //right inner tire
point.5 = 2, -12.128, -14.158, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0 //left wing scrape
point.6 = 2, -12.128, 14.306, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0 //right wing scrape
point.7 = 2, -18.275, 0, -3.298, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0 //tail scrape
point.8 = 2, 23.092, 0, -3.465, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0 //nose scrape
I got it! Tweaked the static compression and the dampening ratio (I think those are the ones I tweaked) and the bird lands great now. 3 nice landings in a row....then I did a hard landing and had a few bounces, which were to be expected, but the bird settled down nicely.
[contact_points]
static_pitch = 1.6
static_cg_height = 8.2
tailwheel_lock = 0
gear_system_type = 1
max_number_of_points = 7
point.0 = 1, 11.5026, 0, -8.55, 2500, 0, 1, 25, 0.35, 3, 0.8, 6, 4, 0, 260, 300
point.1 = 1, -7.42, -4.5998, -8.1166, 2500, 1, 1.2, 0, 0.75, 2.5, 0.85, 5, 7, 2, 260, 300
point.2 = 1, -7.42, 4.5998, -8.1166, 2500, 2, 1.2, 0, 0.75, 2.5, 0.85, 7, 5, 3, 260, 300
point.3 = 2, -12.128, -14.158, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0
point.4 = 2, -12.128, 14.306, -0.728, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0
point.5 = 2, -18.275, 0, -3.298, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0
point.6 = 2, 23.092, 0, -3.465, 1500, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0
OBIO