IGC Spy

Glider F2 Thermal Info (Task 6-18m)

		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			00:57:19			22073	2855	12.9 %	62.8						27 00:00:28 blah			3.8					18
1	Thermal	11:59:06	12:00:10	00:01:04	3316	3654	337	65	19.4 %	61 61	36.9 60.5	79.2 61.5	320 320	312 312	327 327	32 32	31 31	33 33	3.2 3.2	1.7 1.7	4.6 4.6	Right	2	2
1	Orbit	11:59:06	11:59:37	00:00:31	3316	3559	242	26	10.8 %	61.5			0			31			4.6			Right	1
2	Orbit	11:59:37	12:00:10	00:00:33	3559	3654	95	39	41.4 %	60.5			0			33			1.7			Right	1
2	Thermal	12:02:25	12:03:31	00:01:06	3543	3976	433	45	10.6 %	56.4 59.3	32.5 59.3	88.6 59.3	218 311	8 311	335 311	22 32	1 32	33 32	1.4 3	-3.9 3	5 3	Left	2.1	3
3	Orbit	12:02:25	12:02:58	00:00:33	3543	3822	278	29	10.6 %	61.9			0			33			5			Left	1.1
4	Orbit	12:02:58	12:03:30	00:00:32	3822	3982	160	9	6.1 %	59.3			0			32			3			Left	1
5	Orbit	12:03:30	12:03:31	00:00:01	3982	3976	-6	6	-100 %	47.9			0			01			-3.9			Left	0
3	Thermal	12:08:53	12:10:53	00:02:00	3221	3815	593	88	14.9 %	62.2 65.7	41.6 61.5	92 68.2	252 296	71 276	332 332	24 27.7	9 25	33 33	2.9 2.9	1.1 1.1	4.2 4.2	Right	4	5
6	Orbit	12:08:53	12:09:21	00:00:28	3221	3398	177	6	3.7 %	65.4			0			28			3.7			Right	0.9
7	Orbit	12:09:21	12:09:46	00:00:25	3398	3546	147	26	17.8 %	67.5			0			25			3.5			Right	0.9
8	Orbit	12:09:46	12:10:11	00:00:25	3546	3723	177	3	1.9 %	68.2			0			25			4.2			Right	0.9
9	Orbit	12:10:11	12:10:44	00:00:33	3723	3782	59	42	72.2 %	61.5			0			33			1.1			Right	1
10	Orbit	12:10:44	12:10:53	00:00:09	3782	3815	32	9	30 %	48.3			0			09			2.2			Right	0.2
4	Thermal	12:11:08	12:13:52	00:02:44	4015	5059	1043	36	3.5 %	65.7 65.2	36.9 64.7	90.4 65.7	294 291	270 275	328 301	27.3 27.3	24 26	31 28	3.7 3.8	2.5 3.4	4.6 4.5	Right	5.5	6
11	Orbit	12:11:08	12:11:39	00:00:31	4015	4258	242	0	0 %	64.5			0			31			4.6			Right	1
12	Orbit	12:11:39	12:12:05	00:00:26	4258	4409	150	16	10.9 %	64.7			0			26			3.4			Right	0.9
13	Orbit	12:12:05	12:12:33	00:00:28	4409	4586	177	6	3.7 %	65.7			0			28			3.7			Right	0.9
14	Orbit	12:12:33	12:13:01	00:00:28	4586	4750	164	3	2 %	65.4			0			28			3.5			Right	0.9
15	Orbit	12:13:01	12:13:28	00:00:27	4750	4957	206	0	0 %	65.2			0			27			4.5			Right	0.9
16	Orbit	12:13:28	12:13:52	00:00:24	4957	5059	101	9	9.7 %	68.6			0			24			2.5			Right	0.8
5	Thermal	12:32:45	12:34:35	00:01:50	1138	1332	193	124	64.4 %	54.5 57.8	33.9 57.3	77.6 58.2	250 279	127 276	315 282	27.5 29.5	17 29	34 30	1 1	0.7 0.8	1.3 1.3	Left	3.1	4
17	Orbit	12:32:45	12:33:19	00:00:34	1138	1210	72	42	59.1 %	56.6			0			34			1.3			Left	1
18	Orbit	12:33:19	12:33:48	00:00:29	1210	1272	62	39	63.2 %	58.2			0			29			1.3			Left	0.9
19	Orbit	12:33:48	12:34:18	00:00:30	1272	1312	39	29	75 %	57.3			0			30			0.8			Left	0.9
20	Orbit	12:34:18	12:34:35	00:00:17	1312	1332	19	13	66.7 %	45.8			0			17			0.7			Left	0.4
6	Thermal	12:36:39	12:40:30	00:03:51	1341	1984	643	232	36.2 %	59.5 61	33.3 58.8	83 62.4	281 288	218 260	313 313	28.9 28.8	26 26	32 32	1.7 1.9	0.4 0.4	3 3	Left	7.1	8
24	Orbit	12:36:39	12:37:11	00:00:32	1341	1400	59	26	44.4 %	58.6			0			32			1.1			Left	1
25	Orbit	12:37:11	12:37:42	00:00:31	1400	1423	22	52	228.6 %	61.6			0			31			0.4			Left	1
26	Orbit	12:37:42	12:38:12	00:00:30	1423	1519	95	26	27.6 %	61.4			0			30			1.9			Left	0.9
27	Orbit	12:38:12	12:38:39	00:00:27	1519	1591	72	32	45.5 %	62.4			0			27			1.6			Left	0.9
28	Orbit	12:38:39	12:39:05	00:00:26	1591	1722	131	9	7.5 %	61.1			0			26			3			Left	0.8
29	Orbit	12:39:05	12:39:32	00:00:27	1722	1833	111	9	8.8 %	60.7			0			27			2.4			Left	0.8
30	Orbit	12:39:32	12:40:04	00:00:32	1833	1945	111	36	32.4 %	58.8			0			32			2.1			Left	1
31	Orbit	12:40:04	12:40:30	00:00:26	1945	1984	39	39	100 %	51.2			0			26			0.9			Left	0.7
7	Thermal	12:41:11	12:49:28	00:08:17	1975	3959	1984	810	40.8 %	66.6 66	37.7 62.8	92.4 70.7	360 371	173 275	458 458	33.1 34.3	14 26	42 42	2.4 2.6	0.4 0.4	5.9 5.9	Left	16.9	15
32	Orbit	12:41:11	12:41:48	00:00:37	1975	2063	88	85	96.3 %	65.5			0			37			1.4			Left	1.2
33	Orbit	12:41:48	12:42:14	00:00:26	2063	2322	259	6	2.5 %	64.7			0			26			5.9			Left	0.9
34	Orbit	12:42:14	12:42:50	00:00:36	2322	2457	134	42	31.7 %	65.1			0			36			2.2			Left	1.2
35	Orbit	12:42:50	12:43:32	00:00:42	2457	2539	82	78	96 %	66.5			0			42			1.2			Left	1.4
36	Orbit	12:43:32	12:44:06	00:00:34	2539	2864	324	13	4 %	62.8			0			34			5.7			Left	1.1
37	Orbit	12:44:06	12:44:37	00:00:31	2864	2949	85	55	65.4 %	63.2			0			31			1.6			Left	1
38	Orbit	12:44:37	12:45:14	00:00:37	2949	2975	26	104	400 %	65.3			0			37			0.4			Left	1.2
39	Orbit	12:45:14	12:45:52	00:00:38	2975	3005	29	127	433.3 %	65.6			0			38			0.5			Left	1.3
40	Orbit	12:45:52	12:46:29	00:00:37	3005	3120	114	68	60 %	67.1			0			37			1.8			Left	1.3
41	Orbit	12:46:29	12:47:04	00:00:35	3120	3188	68	118	171.4 %	66.1			0			35			1.2			Left	1.2
42	Orbit	12:47:04	12:47:35	00:00:31	3188	3408	219	19	9 %	66.8			0			31			4.2			Left	1.1
43	Orbit	12:47:35	12:48:08	00:00:33	3408	3589	180	32	18.2 %	67.6			0			33			3.2			Left	1.1
44	Orbit	12:48:08	12:48:37	00:00:29	3589	3733	144	36	25 %	66.4			0			29			2.9			Left	1
45	Orbit	12:48:37	12:49:14	00:00:37	3733	3950	216	16	7.6 %	70.7			0			37			3.5			Left	1.3
46	Orbit	12:49:14	12:49:28	00:00:14	3950	3959	9	3	33.3 %	75.6			0			14			0.4			Left	0.5
8	Thermal	12:49:51	12:50:57	00:01:06	4087	4248	160	132	82.2 %	63.7 63.7	37.1 61.7	86.3 65.8	344 344	334 334	353 353	33 33	31 31	35 35	1.5 1.5	0.6 0.6	2.4 2.4	Left	2.2	2
47	Orbit	12:49:51	12:50:22	00:00:31	4087	4212	124	55	44.7 %	65.8			0			31			2.4			Left	1
48	Orbit	12:50:22	12:50:57	00:00:35	4212	4248	36	76	211.7 %	61.7			0			35			0.6			Left	1.1
9	Thermal	12:55:45	12:57:00	00:01:15	2975	3487	511	6	1.3 %	60.2 62.1	40.1 62.1	83.5 62.1	248 265	169 265	310 265	25 26	18 26	31 26	4.1 3.7	3.7 3.7	4.4 3.7	Right	2.3	3
49	Orbit	12:55:45	12:56:16	00:00:31	2975	3192	216	0	0 %	61.1			0			31			4.1			Right	1
50	Orbit	12:56:16	12:56:42	00:00:26	3192	3353	160	6	4.1 %	62.1			0			26			3.7			Right	0.8
51	Orbit	12:56:42	12:57:00	00:00:18	3353	3487	134	0	0 %	57.4			0			18			4.4			Right	0.5
10	Thermal	12:57:06	13:00:55	00:03:49	3526	5164	1637	68	4.2 %	63.1 61.9	40.5 60.6	84.8 63.7	262 271	159 249	302 302	25.4 26.7	14 25	29 29	4.3 4.1	3.5 3.5	4.7 4.7	Right	7.4	9
52	Orbit	12:57:06	12:57:34	00:00:28	3526	3746	219	0	0 %	65.2			0			28			4.7			Right	0.9
53	Orbit	12:57:34	12:57:59	00:00:25	3746	3946	200	0	0 %	62.6			0			25			4.7			Right	0.8
54	Orbit	12:57:59	12:58:24	00:00:25	3946	4101	154	9	6.4 %	60.9			0			25			3.7			Right	0.8
55	Orbit	12:58:24	12:58:51	00:00:27	4101	4261	160	22	14.3 %	62.5			0			27			3.5			Right	0.9
56	Orbit	12:58:51	12:59:17	00:00:26	4261	4416	154	29	19.1 %	62.5			0			26			3.5			Right	0.8
57	Orbit	12:59:17	12:59:46	00:00:29	4416	4635	219	0	0 %	63.7			0			29			4.5			Right	0.9
58	Orbit	12:59:46	13:00:14	00:00:28	4635	4849	213	3	1.5 %	60.6			0			28			4.5			Right	0.9
59	Orbit	13:00:14	13:00:41	00:00:27	4849	5052	203	3	1.6 %	60.8			0			27			4.5			Right	0.8
60	Orbit	13:00:41	13:00:55	00:00:14	5052	5164	111	0	0 %	69.5			0			14			4.7			Right	0.5
11	Thermal	13:02:18	13:05:22	00:03:04	5000	6827	1827	147	8.1 %	62.6 65.3	39.1 63.6	88.5 66.8	275 316	90 274	354 354	26.3 29.6	11 26	34 34	5.6 5.9	0.5 2.6	9.2 7.9	Right	6	7
61	Orbit	13:02:18	13:02:43	00:00:25	5000	5387	387	0	0 %	62			0			25			9.2			Right	0.8
62	Orbit	13:02:43	13:03:09	00:00:26	5387	5734	347	0	0 %	64.4			0			26			7.9			Right	0.9
63	Orbit	13:03:09	13:03:38	00:00:29	5734	6085	351	0	0 %	65.3			0			29			7.2			Right	1
64	Orbit	13:03:38	13:04:09	00:00:31	6085	6420	334	3	1 %	66.8			0			31			6.4			Right	1.1
65	Orbit	13:04:09	13:04:43	00:00:34	6420	6571	150	82	54.3 %	63.6			0			34			2.6			Right	1.1
66	Orbit	13:04:43	13:05:11	00:00:28	6571	6817	246	3	1.3 %	66.3			0			28			5.2			Right	1
67	Orbit	13:05:11	13:05:22	00:00:11	6817	6827	9	59	600 %	50.2			0			11			0.5			Right	0.3
12	Thermal	13:12:23	13:16:37	00:04:14	4950	7762	2811	137	4.9 %	67.5 66.5	38.2 63.9	90.7 68.6	278 281	246 267	314 314	25.4 25.9	18 25	30 30	6.4 7.1	-0.2 5.4	8.3 8.3	Right	8.7	10
68	Orbit	13:12:23	13:12:52	00:00:29	4950	5278	328	6	2 %	59.4			0			29			6.7			Right	0.9
69	Orbit	13:12:52	13:13:22	00:00:30	5278	5623	344	0	0 %	63.9			0			30			6.8			Right	1
70	Orbit	13:13:22	13:13:47	00:00:25	5623	5951	328	0	0 %	65.3			0			25			7.8			Right	0.8
71	Orbit	13:13:47	13:14:12	00:00:25	5951	6269	318	0	0 %	66.5			0			25			7.5			Right	0.9
72	Orbit	13:14:12	13:14:38	00:00:26	6269	6633	364	0	0 %	65.7			0			26			8.3			Right	0.9
73	Orbit	13:14:38	13:15:03	00:00:25	6633	6945	311	0	0 %	68.4			0			25			7.4			Right	0.9
74	Orbit	13:15:03	13:15:29	00:00:26	6945	7260	314	0	0 %	67.7			0			26			7.2			Right	0.9
75	Orbit	13:15:29	13:15:54	00:00:25	7260	7542	282	0	0 %	65.8			0			25			6.7			Right	0.8
76	Orbit	13:15:54	13:16:19	00:00:25	7542	7769	226	0	0 %	68.6			0			25			5.4			Right	0.9
77	Orbit	13:16:19	13:16:37	00:00:18	7769	7762	-6	131	-2000 %	83.6			0			18			-0.2			Right	0.8
13	Thermal	13:26:05	13:27:17	00:01:12	4767	5236	469	104	22.4 %	68.9 66.2	40.9 66.2	86.9 66.2	257 379	64 379	379 379	24 35	5 35	35 35	1.5 4.2	-4.7 4.2	4.9 4.2	Left	2.4	3
78	Orbit	13:26:05	13:26:37	00:00:32	4767	5029	262	52	20 %	62.3			0			32			4.9			Left	1
79	Orbit	13:26:37	13:27:12	00:00:35	5029	5275	246	13	5.3 %	66.2			0			35			4.2			Left	1.2
80	Orbit	13:27:12	13:27:17	00:00:05	5275	5236	-39	39	-100 %	78.3			0			05			-4.7			Left	0.2
14	Thermal	13:29:44	13:33:36	00:03:52	4543	6594	2050	91	4.5 %	63.4 63.3	35.2 61.5	86.3 65.7	267 260	233 233	299 288	25.8 25.1	22 22	29 28	5.3 5.7	1.9 4.2	6.5 6.5	Right	7.6	9
81	Orbit	13:29:44	13:30:13	00:00:29	4543	4822	278	13	4.7 %	63			0			29			5.7			Right	0.9
82	Orbit	13:30:13	13:30:41	00:00:28	4822	5114	291	0	0 %	62.8			0			28			6.2			Right	0.9
83	Orbit	13:30:41	13:31:06	00:00:25	5114	5387	272	0	0 %	65.7			0			25			6.5			Right	0.8
84	Orbit	13:31:06	13:31:31	00:00:25	5387	5659	272	0	0 %	64.4			0			25			6.5			Right	0.8
85	Orbit	13:31:31	13:31:53	00:00:22	5659	5872	213	3	1.5 %	64.6			0			22			5.7			Right	0.7
86	Orbit	13:31:53	13:32:18	00:00:25	5872	6108	236	9	4.2 %	61.5			0			25			5.6			Right	0.8
87	Orbit	13:32:18	13:32:43	00:00:25	6108	6325	216	3	1.5 %	61.6			0			25			5.1			Right	0.8
88	Orbit	13:32:43	13:33:09	00:00:26	6325	6509	183	9	5.4 %	62.2			0			26			4.2			Right	0.8
89	Orbit	13:33:09	13:33:36	00:00:27	6509	6594	85	52	61.5 %	64.4			0			27			1.9			Right	0.9
15	Thermal	13:42:12	13:45:55	00:03:43	4993	7713	2719	39	1.4 %	65.7 64.9	43.5 63.8	82.5 66.5	263 291	75 261	338 338	24.8 27.4	6 25	32 32	6.3 7.5	-3.9 4.3	9 9	Left	7.4	9
90	Orbit	13:42:12	13:42:37	00:00:25	4993	5328	334	0	0 %	60.8			0			25			7.9			Left	0.8
91	Orbit	13:42:37	13:43:02	00:00:25	5328	5698	370	0	0 %	63.8			0			25			8.8			Left	0.8
92	Orbit	13:43:02	13:43:28	00:00:26	5698	6095	396	0	0 %	63.9			0			26			9			Left	0.9
93	Orbit	13:43:28	13:43:54	00:00:26	6095	6463	367	0	0 %	64.3			0			26			8.4			Left	0.9
94	Orbit	13:43:54	13:44:23	00:00:29	6463	6840	377	0	0 %	66.5			0			29			7.7			Left	1
95	Orbit	13:44:23	13:44:55	00:00:32	6840	7244	403	0	0 %	64.4			0			32			7.5			Left	1.1
96	Orbit	13:44:55	13:45:21	00:00:26	7244	7549	305	0	0 %	65.1			0			26			7			Left	0.9
97	Orbit	13:45:21	13:45:49	00:00:28	7549	7752	203	0	0 %	66.1			0			28			4.3			Left	1
98	Orbit	13:45:49	13:45:55	00:00:06	7752	7713	-39	39	-100 %	76.3			0			06			-3.9			Left	0.2
16	Thermal	13:56:53	13:59:43	00:02:50	5150	6768	1617	91	5.7 %	66.7 68	35.7 66.4	93.5 71.1	309 314	292 301	326 326	28.3 28.3	27 27	30 29	5.6 5.9	4.3 5.1	6.4 6.4	Left	5.8	6
99	Orbit	13:56:53	13:57:23	00:00:30	5150	5439	288	13	4.5 %	59.5			0			30			5.7			Left	0.9
100	Orbit	13:57:23	13:57:52	00:00:29	5439	5751	311	39	12.6 %	66.4			0			29			6.4			Left	1
101	Orbit	13:57:52	13:58:21	00:00:29	5751	6056	305	16	5.4 %	66.5			0			29			6.2			Left	1
102	Orbit	13:58:21	13:58:49	00:00:28	6056	6299	242	0	0 %	71.1			0			28			5.1			Left	1
103	Orbit	13:58:49	13:59:16	00:00:27	6299	6571	272	3	1.2 %	68			0			27			6			Left	0.9
104	Orbit	13:59:16	13:59:43	00:00:27	6571	6768	196	19	10 %	69.1			0			27			4.3			Left	1
17	Thermal	14:18:04	14:23:34	00:05:30	2545	4064	1519	406	26.8 %	61.4 60.1	34.9 56.9	88 65.5	273 285	181 235	336 336	27.5 28.9	14 24	34 34	2.8 2.9	-1.1 -1.1	4.8 4.8	Left	10.3	12
107	Orbit	14:18:04	14:18:31	00:00:27	2545	2700	154	22	14.9 %	56.6			0			27			3.4			Left	0.8
108	Orbit	14:18:31	14:18:56	00:00:25	2700	2890	190	9	5.2 %	57.4			0			25			4.5			Left	0.7
109	Orbit	14:18:56	14:19:28	00:00:32	2890	2988	98	29	30 %	61.9			0			32			1.8			Left	1
110	Orbit	14:19:28	14:19:57	00:00:29	2988	3225	236	3	1.4 %	60.9			0			29			4.8			Left	0.9
111	Orbit	14:19:57	14:20:21	00:00:24	3225	3408	183	0	0 %	61.6			0			24			4.5			Left	0.8
112	Orbit	14:20:21	14:20:52	00:00:31	3408	3608	200	3	1.6 %	59.7			0			31			3.8			Left	1
113	Orbit	14:20:52	14:21:19	00:00:27	3608	3756	147	13	8.9 %	57.3			0			27			3.2			Left	0.8
114	Orbit	14:21:19	14:21:44	00:00:25	3756	3884	127	13	10.3 %	59.5			0			25			3			Left	0.8
115	Orbit	14:21:44	14:22:16	00:00:32	3884	3825	-59	173	-294.4 %	56.9			0			32			-1.1			Left	0.9
116	Orbit	14:22:16	14:22:46	00:00:30	3825	3950	124	39	31.6 %	65.5			0			30			2.5			Left	1
117	Orbit	14:22:46	14:23:20	00:00:34	3950	4035	85	75	88.5 %	60.3			0			34			1.5			Left	1.1
118	Orbit	14:23:20	14:23:34	00:00:14	4035	4064	29	22	77.8 %	79			0			14			1.2			Left	0.6
18	Thermal	14:25:55	14:31:47	00:05:52	4028	5547	1519	223	14.7 %	61.7 60.7	31.2 59	86.5 63.6	253 255	193 226	305 305	25.1 25.7	16 23	31 31	2.5 3	-2.9 0.7	3.9 3.9	Left	11.1	14
121	Orbit	14:25:55	14:26:23	00:00:28	4028	4114	85	13	15.4 %	62.2			0			28			1.8			Left	0.9
122	Orbit	14:26:23	14:26:51	00:00:28	4114	4288	173	19	11.3 %	61.2			0			28			3.7			Left	0.9
123	Orbit	14:26:51	14:27:14	00:00:23	4288	4389	101	9	9.7 %	63.1			0			23			2.6			Left	0.7
124	Orbit	14:27:14	14:27:39	00:00:25	4389	4524	134	3	2.4 %	59.9			0			25			3.2			Left	0.8
125	Orbit	14:27:39	14:28:05	00:00:26	4524	4668	144	9	6.8 %	59			0			26			3.3			Left	0.8
126	Orbit	14:28:05	14:28:31	00:00:26	4668	4799	131	9	7.5 %	59.1			0			26			3			Left	0.8
127	Orbit	14:28:31	14:28:54	00:00:23	4799	4950	150	3	2.2 %	60.7			0			23			3.9			Left	0.7
128	Orbit	14:28:54	14:29:17	00:00:23	4950	5078	127	6	5.1 %	60			0			23			3.3			Left	0.7
129	Orbit	14:29:17	14:29:41	00:00:24	5078	5216	137	0	0 %	60.8			0			24			3.4			Left	0.8
130	Orbit	14:29:41	14:30:05	00:00:24	5216	5347	131	3	2.5 %	59.7			0			24			3.2			Left	0.7
131	Orbit	14:30:05	14:30:30	00:00:25	5347	5456	108	6	6.1 %	63.6			0			25			2.6			Left	0.8
132	Orbit	14:30:30	14:31:01	00:00:31	5456	5590	134	6	4.9 %	60.2			0			31			2.6			Left	1
133	Orbit	14:31:01	14:31:31	00:00:30	5590	5626	36	22	63.6 %	60.8			0			30			0.7			Left	0.9
134	Orbit	14:31:31	14:31:47	00:00:16	5626	5547	-78	108	-137.5 %	73.8			0			16			-2.9			Left	0.6

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 (F2)

Glider F2 Thermal Info (Task 6-18m)

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