IGC Spy

Glider VH Thermal Info (Task 2 15 Metre 11 December 2019)

		Thermal Time			Thermal Alt					Orbits Speed			Orbits Diam			Orbit Time			Climb Rate			Other
ID	Type	Start [hms]	End [hms]	Duration [hms]	Start [ft]	End [ft]	Delta [ft]	Lost [ft]	Lost [%]	Avg (stab) [kts]	Min (stab) [kts]	Max (stab) [kts]	Avg (stab) [m]	Min (stab) [m]	Max (stab) [m]	Avg (stab) [sec]	Min (stab) [sec]	Max (stab) [sec]	Avg (stab) [kts]	Min (stab) [kts]	Max (stab) [kts]	Direction	Track Length [km]	Count
0	All			00:48:11			15472	2670	17.3 %	62.4						23 blah			3.2					19
1	Thermal	04:17:43	04:19:20	00:01:37	3175	3608	433	104	24.2 %	62.6 61.9	43.5 61.4	77.6 62.5	249 243	235 241	273 246	24.3 24	23 24	26 24	2.6 2.8	0.7 2.3	4.1 3.2	Right	3.1	4
1	Orbit	04:17:43	04:18:09	00:00:26	3175	3356	180	19	10.9 %	64			0			26			4.1			Right	0.9
2	Orbit	04:18:09	04:18:33	00:00:24	3356	3487	131	13	10 %	61.4			0			24			3.2			Right	0.8
3	Orbit	04:18:33	04:18:57	00:00:24	3487	3582	95	16	17.2 %	62.5			0			24			2.3			Right	0.8
4	Orbit	04:18:57	04:19:20	00:00:23	3582	3608	26	55	212.5 %	62.4			0			23			0.7			Right	0.7
2	Thermal	04:26:25	04:27:59	00:01:34	2424	2690	265	98	37 %	63 63.2	43.2 63	82.6 63.4	244 254	163 249	308 258	23.5 24.5	17 24	28 25	1.7 2.2	1 2	2.4 2.4	Left	3.1	4
5	Orbit	04:26:25	04:26:53	00:00:28	2424	2473	49	52	106.7 %	67.2			0			28			1			Left	1
6	Orbit	04:26:53	04:27:17	00:00:24	2473	2572	98	26	26.7 %	63.4			0			24			2.4			Left	0.8
7	Orbit	04:27:17	04:27:42	00:00:25	2572	2657	85	9	11.5 %	63			0			25			2			Left	0.8
8	Orbit	04:27:42	04:27:59	00:00:17	2657	2690	32	9	30 %	58.5			0			17			1.1			Left	0.5
3	Thermal	04:28:05	04:31:52	00:03:47	2742	4094	1351	137	10.2 %	62.3 60.2	39.7 59.1	95.6 62.2	226 244	96 215	275 275	22.7 24.8	7 22	28 28	2.7 3.9	-7.8 2	4.9 4.9	Left	7.1	10
9	Orbit	04:28:05	04:28:27	00:00:22	2742	2900	157	0	0 %	57.9			0			22			4.2			Left	0.7
10	Orbit	04:28:27	04:28:50	00:00:23	2900	3051	150	3	2.2 %	59.8			0			23			3.9			Left	0.7
11	Orbit	04:28:50	04:29:12	00:00:22	3051	3208	157	16	10.4 %	59.7			0			22			4.2			Left	0.7
12	Orbit	04:29:12	04:29:37	00:00:25	3208	3402	193	6	3.4 %	60.6			0			25			4.6			Left	0.8
13	Orbit	04:29:37	04:30:02	00:00:25	3402	3608	206	3	1.6 %	60			0			25			4.9			Left	0.8
14	Orbit	04:30:02	04:30:27	00:00:25	3608	3776	167	0	0 %	59.1			0			25			4			Left	0.8
15	Orbit	04:30:27	04:30:55	00:00:28	3776	3894	118	0	0 %	59.9			0			28			2.5			Left	0.9
16	Orbit	04:30:55	04:31:20	00:00:25	3894	4101	206	0	0 %	62.2			0			25			4.9			Left	0.8
17	Orbit	04:31:20	04:31:45	00:00:25	4101	4186	85	16	19.2 %	60.5			0			25			2			Left	0.8
18	Orbit	04:31:45	04:31:52	00:00:07	4186	4094	-91	91	-100 %	83.8			0			07			-7.8			Left	0.3
4	Thermal	04:34:54	04:36:04	00:01:10	3513	3799	285	68	24.1 %	63 62.3	48.3 62.3	76.8 62.3	241 225	224 225	275 225	23.3 22	22 22	26 22	2.3 2.9	0 2.9	4 2.9	Right	2.3	3
19	Orbit	04:34:54	04:35:20	00:00:26	3513	3690	177	0	0 %	64.7			0			26			4			Right	0.9
20	Orbit	04:35:20	04:35:42	00:00:22	3690	3799	108	9	9.1 %	62.3			0			22			2.9			Right	0.7
21	Orbit	04:35:42	04:36:04	00:00:22	3799	3799	0	59	0 %	62.1			0			22			0			Right	0.7
5	Thermal	04:38:15	04:40:01	00:01:46	3467	4061	593	98	16.6 %	64.5 63.1	42.7 61.7	89.7 64.7	224 214	202 202	251 223	21.2 20.7	20 20	23 21	3.4 3.7	0.5 3.3	5.3 4.2	Right	3.5	5
22	Orbit	04:38:15	04:38:36	00:00:21	3467	3654	187	0	0 %	66.7			0			21			5.3			Right	0.7
23	Orbit	04:38:36	04:38:57	00:00:21	3654	3782	127	0	0 %	64.7			0			21			3.6			Right	0.7
24	Orbit	04:38:57	04:39:17	00:00:20	3782	3894	111	6	5.9 %	61.7			0			20			3.3			Right	0.6
25	Orbit	04:39:17	04:39:38	00:00:21	3894	4041	147	9	6.7 %	62.8			0			21			4.2			Right	0.7
26	Orbit	04:39:38	04:40:01	00:00:23	4041	4061	19	82	416.7 %	66.7			0			23			0.5			Right	0.8
6	Thermal	04:45:26	04:46:33	00:01:07	2828	3047	219	118	53.7 %	66 64.9	44.5 64.9	83.6 64.9	241 277	152 277	295 277	22.3 26	14 26	27 26	1.8 2.3	1.2 2.3	2.3 2.3	Mixed	2.3	3
27	Orbit	04:45:26	04:45:53	00:00:27	2828	2916	88	45	51.9 %	66.8			0			27			1.9			Right	0.9
28	Orbit	04:45:53	04:46:19	00:00:26	2916	3018	101	29	29 %	64.9			0			26			2.3			Right	0.9
29	Orbit	04:46:19	04:46:33	00:00:14	3018	3047	29	42	144.4 %	66.3			0			14			1.2			Left	0.5
7	Thermal	04:50:49	04:56:12	00:05:23	2125	3599	1473	324	22 %	61 61.1	39.9 57.8	83.6 63.2	215 215	176 176	311 311	21.5 21.5	18 18	30 30	2.8 3.1	0.2 0.3	5 5	Right	10.1	15
30	Orbit	04:50:49	04:51:13	00:00:24	2125	2221	95	6	6.9 %	58			0			24			2.3			Right	0.7
31	Orbit	04:51:13	04:51:38	00:00:25	2221	2263	42	42	100 %	57.8			0			25			1			Right	0.7
32	Orbit	04:51:38	04:52:08	00:00:30	2263	2276	13	101	775 %	63.2			0			30			0.3			Right	1
33	Orbit	04:52:08	04:52:33	00:00:25	2276	2322	45	62	135.7 %	60.8			0			25			1.1			Right	0.8
34	Orbit	04:52:33	04:52:53	00:00:20	2322	2401	78	16	20.8 %	62.8			0			20			2.3			Right	0.6
35	Orbit	04:52:53	04:53:14	00:00:21	2401	2532	131	13	10 %	60.8			0			21			3.7			Right	0.7
36	Orbit	04:53:14	04:53:32	00:00:18	2532	2657	124	6	5.3 %	59.8			0			18			4.1			Right	0.6
37	Orbit	04:53:32	04:53:51	00:00:19	2657	2801	144	0	0 %	60.6			0			19			4.5			Right	0.6
38	Orbit	04:53:51	04:54:12	00:00:21	2801	2975	173	0	0 %	60.3			0			21			4.9			Right	0.7
39	Orbit	04:54:12	04:54:33	00:00:21	2975	3093	118	0	0 %	61.6			0			21			3.3			Right	0.7
40	Orbit	04:54:33	04:54:55	00:00:22	3093	3244	150	0	0 %	60.7			0			22			4.1			Right	0.7
41	Orbit	04:54:55	04:55:13	00:00:18	3244	3395	150	9	6.5 %	61.7			0			18			5			Right	0.6
42	Orbit	04:55:13	04:55:34	00:00:21	3395	3510	114	3	2.9 %	63.1			0			21			3.2			Right	0.7
43	Orbit	04:55:34	04:55:53	00:00:19	3510	3592	82	9	12 %	60.5			0			19			2.6			Right	0.6
44	Orbit	04:55:53	04:56:12	00:00:19	3592	3599	6	52	800 %	64			0			19			0.2			Right	0.6
8	Thermal	05:00:30	05:04:35	00:04:05	3238	4816	1578	85	5.4 %	62.4 61	42.8 57.8	80.5 64	204 222	13 209	271 271	20.4 22.2	1 20	26 26	3.4 3.7	-1.9 0.9	5.2 5.2	Right	7.7	12
48	Orbit	05:00:30	05:00:52	00:00:22	3238	3428	190	0	0 %	59.9			0			22			5.1			Right	0.7
49	Orbit	05:00:52	05:01:15	00:00:23	3428	3628	200	0	0 %	57.8			0			23			5.2			Right	0.7
50	Orbit	05:01:15	05:01:38	00:00:23	3628	3815	187	3	1.8 %	60.3			0			23			4.8			Right	0.7
51	Orbit	05:01:38	05:02:00	00:00:22	3815	3966	150	0	0 %	59.7			0			22			4.1			Right	0.7
52	Orbit	05:02:00	05:02:21	00:00:21	3966	4097	131	6	5 %	60.7			0			21			3.7			Right	0.7
53	Orbit	05:02:21	05:02:43	00:00:22	4097	4222	124	6	5.3 %	60.2			0			22			3.4			Right	0.7
54	Orbit	05:02:43	05:03:05	00:00:22	4222	4379	157	3	2.1 %	58.5			0			22			4.2			Right	0.7
55	Orbit	05:03:05	05:03:27	00:00:22	4379	4537	157	0	0 %	61.1			0			22			4.2			Right	0.7
56	Orbit	05:03:27	05:03:47	00:00:20	4537	4681	144	0	0 %	63.9			0			20			4.3			Right	0.7
57	Orbit	05:03:47	05:04:13	00:00:26	4681	4786	104	6	6.3 %	63.7			0			26			2.4			Right	0.9
58	Orbit	05:04:13	05:04:34	00:00:21	4786	4819	32	55	170 %	64			0			21			0.9			Right	0.7
59	Orbit	05:04:34	05:04:35	00:00:01	4819	4816	-3	3	-100 %	78.8			0			01			-1.9			Right	0
9	Thermal	05:11:42	05:14:04	00:02:22	3497	4104	606	137	22.7 %	62.9 59.7	42.6 58.4	82.7 62	241 239	226 226	254 254	23.7 24.5	19 23	25 25	2.4 3.2	-1.4 1.6	4.9 4.9	Right	4.6	6
60	Orbit	05:11:42	05:12:07	00:00:25	3497	3615	118	9	8.3 %	60.7			0			25			2.8			Right	0.8
61	Orbit	05:12:07	05:12:32	00:00:25	3615	3789	173	3	1.9 %	58.4			0			25			4.1			Right	0.8
62	Orbit	05:12:32	05:12:57	00:00:25	3789	3996	206	0	0 %	58.5			0			25			4.9			Right	0.8
63	Orbit	05:12:57	05:13:22	00:00:25	3996	4087	91	42	46.4 %	62			0			25			2.2			Right	0.8
64	Orbit	05:13:22	05:13:45	00:00:23	4087	4150	62	13	21.1 %	59.9			0			23			1.6			Right	0.7
65	Orbit	05:13:45	05:14:04	00:00:19	4150	4104	-45	68	-150 %	77.8			0			19			-1.4			Right	0.8
10	Thermal	05:24:38	05:27:29	00:02:51	2401	3175	774	200	25.8 %	58.4 57.9	39.3 55.3	78.6 60.2	273 246	223 223	385 266	28.5 26	24 24	40 27	2.8 3.1	1.8 1.8	3.8 3.8	Left	5.1	6
70	Orbit	05:24:38	05:25:18	00:00:40	2401	2532	131	62	47.5 %	58.8			0			40			1.9			Left	1.2
71	Orbit	05:25:18	05:25:42	00:00:24	2532	2687	154	13	8.5 %	56.9			0			24			3.8			Left	0.7
72	Orbit	05:25:42	05:26:09	00:00:27	2687	2769	82	36	44 %	55.3			0			27			1.8			Left	0.8
73	Orbit	05:26:09	05:26:35	00:00:26	2769	2910	141	26	18.6 %	59.2			0			26			3.2			Left	0.8
74	Orbit	05:26:35	05:27:02	00:00:27	2910	3064	154	9	6.4 %	60.2			0			27			3.4			Left	0.8
75	Orbit	05:27:02	05:27:29	00:00:27	3064	3175	111	52	47.1 %	60.3			0			27			2.4			Left	0.8
11	Thermal	05:28:45	05:30:07	00:01:22	2814	3287	472	72	15.3 %	60.9 58.7	37.3 58.7	78.9 58.7	273 221	221 221	311 221	27.3 23	23 23	30 23	3.6 5.2	2.5 5.2	5.2 5.2	Left	2.6	3
76	Orbit	05:28:45	05:29:14	00:00:29	2814	2959	144	26	18.2 %	60.7			0			29			2.9			Left	0.9
77	Orbit	05:29:14	05:29:37	00:00:23	2959	3162	203	19	9.7 %	58.7			0			23			5.2			Left	0.7
78	Orbit	05:29:37	05:30:07	00:00:30	3162	3287	124	26	21.1 %	63.2			0			30			2.5			Left	1
12	Thermal	05:32:27	05:35:40	00:03:13	2942	4048	1105	95	8.6 %	61.8 61.8	41.3 60	80.3 63.8	244 251	203 231	282 282	24.1 24.8	20 23	27 27	3.4 3.3	0.6 0.6	4.8 4.7	Right	6.1	8
79	Orbit	05:32:27	05:32:51	00:00:24	2942	3136	193	0	0 %	61.6			0			24			4.8			Right	0.8
80	Orbit	05:32:51	05:33:17	00:00:26	3136	3343	206	16	7.9 %	61.6			0			26			4.7			Right	0.8
81	Orbit	05:33:17	05:33:43	00:00:26	3343	3536	193	6	3.4 %	60			0			26			4.4			Right	0.8
82	Orbit	05:33:43	05:34:07	00:00:24	3536	3684	147	0	0 %	61.4			0			24			3.6			Right	0.8
83	Orbit	05:34:07	05:34:30	00:00:23	3684	3815	131	0	0 %	62.7			0			23			3.4			Right	0.7
84	Orbit	05:34:30	05:34:53	00:00:23	3815	3940	124	0	0 %	61.2			0			23			3.2			Right	0.7
85	Orbit	05:34:53	05:35:20	00:00:27	3940	3966	26	55	212.5 %	63.8			0			27			0.6			Right	0.9
86	Orbit	05:35:20	05:35:40	00:00:20	3966	4048	82	16	20 %	62			0			20			2.4			Right	0.6
13	Thermal	05:42:28	05:46:03	00:03:35	3202	4307	1105	144	13.1 %	62.5 62.9	44.6 60.5	80.1 64.5	220 221	160 196	306 306	21.5 21.5	16 19	30 30	2.9 3.2	-0.4 2.4	4.1 4.1	Right	6.9	10
87	Orbit	05:42:28	05:42:55	00:00:27	3202	3372	170	6	3.8 %	61.2			0			27			3.7			Right	0.9
88	Orbit	05:42:55	05:43:25	00:00:30	3372	3543	170	22	13.5 %	62.4			0			30			3.4			Right	1
89	Orbit	05:43:25	05:43:48	00:00:23	3543	3677	134	6	4.9 %	62.8			0			23			3.5			Right	0.7
90	Orbit	05:43:48	05:44:08	00:00:20	3677	3815	137	0	0 %	63.2			0			20			4.1			Right	0.6
91	Orbit	05:44:08	05:44:29	00:00:21	3815	3920	104	6	6.3 %	64.5			0			21			3			Right	0.7
92	Orbit	05:44:29	05:44:49	00:00:20	3920	4025	104	0	0 %	63.6			0			20			3.1			Right	0.7
93	Orbit	05:44:49	05:45:09	00:00:20	4025	4120	95	6	6.9 %	60.5			0			20			2.8			Right	0.6
94	Orbit	05:45:09	05:45:28	00:00:19	4120	4196	75	9	13 %	62.9			0			19			2.4			Right	0.6
95	Orbit	05:45:28	05:45:47	00:00:19	4196	4317	121	0	0 %	63.3			0			19			3.8			Right	0.6
96	Orbit	05:45:47	05:46:03	00:00:16	4317	4307	-9	85	-866.7 %	61			0			16			-0.4			Right	0.5
14	Thermal	05:50:06	05:52:27	00:02:21	3087	4314	1227	160	13.1 %	64.2 62.4	46.5 61.4	79.3 63.1	295 290	251 251	339 339	28.2 28.3	25 25	33 33	5 5.5	1.6 5.1	7.1 6	Right	4.6	5
97	Orbit	05:50:06	05:50:37	00:00:31	3087	3458	370	0	0 %	61.1			0			31			7.1			Right	1
98	Orbit	05:50:37	05:51:10	00:00:33	3458	3792	334	0	0 %	62.7			0			33			6			Right	1.1
99	Orbit	05:51:10	05:51:37	00:00:27	3792	4032	239	0	0 %	63.1			0			27			5.3			Right	0.9
100	Orbit	05:51:37	05:52:02	00:00:25	4032	4248	216	0	0 %	61.4			0			25			5.1			Right	0.8
101	Orbit	05:52:02	05:52:27	00:00:25	4248	4314	65	160	245 %	72.7			0			25			1.6			Right	0.9
15	Thermal	05:56:12	05:58:02	00:01:50	3287	4055	767	65	8.5 %	60.7 59.1	41.8 57.7	76.4 59.9	216 245	32 235	312 264	22 25.3	3 24	31 27	2.5 4.2	-5.2 3	5 4.9	Right	3.4	5
102	Orbit	05:56:12	05:56:43	00:00:31	3287	3549	262	0	0 %	61.5			0			31			5			Right	1
103	Orbit	05:56:43	05:57:07	00:00:24	3549	3746	196	0	0 %	59.9			0			24			4.9			Right	0.7
104	Orbit	05:57:07	05:57:32	00:00:25	3746	3946	200	0	0 %	57.7			0			25			4.7			Right	0.7
105	Orbit	05:57:32	05:57:59	00:00:27	3946	4081	134	39	29.3 %	59.7			0			27			3			Right	0.8
106	Orbit	05:57:59	05:58:02	00:00:03	4081	4055	-26	26	-100 %	64.8			0			03			-5.2			Right	0.1
16	Thermal	05:59:06	06:00:07	00:01:01	3730	4124	393	82	20.8 %	60.7 60.7	38.3 59	80 62.3	303 303	296 296	309 309	30.5 30.5	29 29	32 32	3.9 3.9	1.6 1.6	6.3 6.3	Right	1.9	2
107	Orbit	05:59:06	05:59:35	00:00:29	3730	4038	308	0	0 %	62.3			0			29			6.3			Right	0.9
108	Orbit	05:59:35	06:00:07	00:00:32	4038	4124	85	82	96.2 %	59			0			32			1.6			Right	1
17	Thermal	06:11:05	06:12:07	00:01:02	2844	3074	229	88	38.6 %	63.8 63.8	43.7 63.7	79.1 63.8	324 324	314 314	334 334	31 31	30 30	32 32	2.2 2.2	1 1	3.3 3.3	Left	2	2
116	Orbit	06:11:05	06:11:37	00:00:32	2844	3024	180	16	9.1 %	63.7			0			32			3.3			Left	1
117	Orbit	06:11:37	06:12:07	00:00:30	3024	3074	49	72	146.7 %	63.8			0			30			1			Left	1
18	Thermal	06:15:14	06:19:56	00:04:42	2437	3802	1364	364	26.7 %	61.7 61.4	39.1 59.4	83.5 63.8	238 232	202 202	309 286	23.5 23.1	20 20	30 28	2.9 3.3	-0.6 2	5.2 5.2	Left	9	12
118	Orbit	06:15:14	06:15:44	00:00:30	2437	2552	114	26	22.9 %	62.9			0			30			2.3			Left	1
119	Orbit	06:15:44	06:16:10	00:00:26	2552	2723	170	22	13.5 %	62			0			26			3.9			Left	0.8
120	Orbit	06:16:10	06:16:35	00:00:25	2723	2887	164	3	2 %	59.7			0			25			3.9			Left	0.8
121	Orbit	06:16:35	06:16:57	00:00:22	2887	3028	141	0	0 %	59.4			0			22			3.8			Left	0.7
122	Orbit	06:16:57	06:17:19	00:00:22	3028	3103	75	75	100 %	60.6			0			22			2			Left	0.7
123	Orbit	06:17:19	06:17:40	00:00:21	3103	3215	111	39	35.3 %	61.7			0			21			3.1			Left	0.7
124	Orbit	06:17:40	06:18:00	00:00:20	3215	3389	173	0	0 %	61.5			0			20			5.2			Left	0.6
125	Orbit	06:18:00	06:18:22	00:00:22	3389	3540	150	22	15.2 %	60.6			0			22			4.1			Left	0.7
126	Orbit	06:18:22	06:18:44	00:00:22	3540	3618	78	22	29.2 %	62.6			0			22			2.1			Left	0.7
127	Orbit	06:18:44	06:19:07	00:00:23	3618	3727	108	29	27.3 %	63.8			0			23			2.8			Left	0.8
128	Orbit	06:19:07	06:19:35	00:00:28	3727	3822	95	42	44.8 %	62.5			0			28			2			Left	0.9
129	Orbit	06:19:35	06:19:56	00:00:21	3822	3802	-19	78	-400 %	63.6			0			21			-0.6			Left	0.7
19	Thermal	06:24:30	06:27:53	00:03:23	3018	4242	1223	223	18.2 %	63.1 60.9	37.4 58.7	86.2 63.4	207 203	161 192	280 219	20.3 20.4	12 20	28 22	3.1 4.5	-8.6 1.3	5.7 5.7	Mixed	6.5	10
130	Orbit	06:24:30	06:24:58	00:00:28	3018	3182	164	3	2 %	61.1			0			28			3.5			Right	0.9
131	Orbit	06:24:58	06:25:18	00:00:20	3182	3359	177	0	0 %	58.7			0			20			5.2			Right	0.6
132	Orbit	06:25:18	06:25:38	00:00:20	3359	3553	193	0	0 %	60.3			0			20			5.7			Right	0.6
133	Orbit	06:25:38	06:25:58	00:00:20	3553	3720	167	0	0 %	61.9			0			20			5			Right	0.6
134	Orbit	06:25:58	06:26:19	00:00:21	3720	3900	180	3	1.8 %	61.7			0			21			5.1			Right	0.7
135	Orbit	06:26:19	06:26:39	00:00:20	3900	4078	177	0	0 %	59.6			0			20			5.2			Right	0.6
136	Orbit	06:26:39	06:27:01	00:00:22	4078	4229	150	0	0 %	60.7			0			22			4.1			Right	0.7
137	Orbit	06:27:01	06:27:21	00:00:20	4229	4373	144	3	2.3 %	63.4			0			20			4.3			Right	0.7
138	Orbit	06:27:21	06:27:41	00:00:20	4373	4416	42	39	92.3 %	61.4			0			20			1.3			Right	0.6
139	Orbit	06:27:41	06:27:53	00:00:12	4416	4242	-173	173	-100 %	82			0			12			-8.6			Left	0.5

Color of the track indicates climb rate
Width of the track indicates ground speed (not air speed)
Pink arrow indicates wind (not always reliable)
Fire indicates thermal source based on wind

IGC-SPY Gliders Competitions Flight LOG analysis (VH)

Glider VH Thermal Info (Task 2 15 Metre 11 December 2019)

Color of the track indicates climb rate Width of the track indicates ground speed (not air speed) Pink arrow indicates wind (not always reliable) Fire indicates thermal source based on wind

Color of the track indicates climb rate
Width of the track indicates ground speed (not air speed)
Pink arrow indicates wind (not always reliable)
Fire indicates thermal source based on wind