Quantcast

Scrub?

The Rocketry Forum

Help Support The Rocketry Forum:

CaptainVideo

Well-Known Member
Joined
Mar 13, 2017
Messages
95
Reaction score
25
Not sure whether to scrub planned launch
Weather report for Sat
High 79
East wing 5 to 7mph, with gusts as high as 21mph

I know the general rule is don't over 20mph, but does that count for gusts 1mph over when steady wind is mild?
 

heada

Well-Known Member
Joined
Jan 18, 2009
Messages
3,454
Reaction score
735
Location
Indianapolis, Indiana
Are those surface winds or winds aloft? It could be 5 to 7 at surface but sustained 25 a few hundred feet up.
 

BABAR

Builds Rockets for NASA
TRF Lifetime Supporter
TRF Supporter
Joined
Aug 27, 2011
Messages
6,466
Reaction score
1,688
What are you flying?
How big is your field?
Saucers and small motor low power could be launched between gusts.
 

CaptainVideo

Well-Known Member
Joined
Mar 13, 2017
Messages
95
Reaction score
25
"Are those surface winds or winds aloft? It could be 5 to 7 at surface but sustained 25 a few hundred feet up."
Don't know, the weather report did not specify.

I don't have the field measurements, it is a soccer practice field. I generally launch a few larger rockets like the Amazon on B engines and smaller ones - Mini Mosquito, Star Trooper, and the Mini Max on 1/4 A3-3T, 1/2A3-4T, and A3-4T.
 

jadebox

Roger Smith
TRF Sponsor
Joined
Jan 18, 2009
Messages
5,674
Reaction score
198
We have held launches with weather forecasts like that. We have an anemometer on the field and watch for the wind speed to drop to a reasonable value for a few seconds before we launch. Basically, we fly between the gusts.
 

rklapp

NAR# 109557
TRF Supporter
Joined
May 8, 2020
Messages
747
Reaction score
483
Location
Oahu, Hawaii
Before 9am and after 5pm are excellent times because the winds usually peak at noon and if you're videoing, the launches look better with the sun low. I'm constantly looking at the hourly forecast to see when's a good time. Right now, my problem is that the weather websites can't seem to agree, so I watch the tops of the monkeypod trees to see how strong the wind is. I start small with the A3 then work my way up to C11.

5.png
 

KennB

I-95 Envoy
Joined
Mar 6, 2010
Messages
2,381
Reaction score
177
Location
Amesbury, MA
Use Windy.com. You can get forecasts 5 or so days in advance and wind from surface to 13.5 km altitude. It can also show you the cloud deck. Very handy.

The link above is for the CMASS home field. Just enter your location in the search field.

For fun, zoom all the way out and have a look at what's happening around the world.
 

rklapp

NAR# 109557
TRF Supporter
Joined
May 8, 2020
Messages
747
Reaction score
483
Location
Oahu, Hawaii
Use Windy.com. You can get forecasts 5 or so days in advance and wind from surface to 13.5 km altitude. It can also show you the cloud deck. Very handy.

The link above is for the CMASS home field. Just enter your location in the search field.

For fun, zoom all the way out and have a look at what's happening around the world.
Nice. Is that the field you usually launch from?
 

mooffle

Well-Known Member
TRF Supporter
Joined
Apr 20, 2020
Messages
132
Reaction score
79
I second windy, the interface for their app and the amount of information is top notch.
 

KennB

I-95 Envoy
Joined
Mar 6, 2010
Messages
2,381
Reaction score
177
Location
Amesbury, MA
Nice. Is that the field you usually launch from?
We get to use the field for regular club launches in April and September through November once or twice each month. We also use it for TARC qualifying in February and March but it can be a bit snowy then. This year, we missed out on the April launch due to the state regulations. We've just pared back the outdoor activities from 100 people to 50 so the September launch may have to be done in shifts.
 

Five

Well-Known Member
Joined
Jun 10, 2020
Messages
152
Reaction score
84
Not sure whether to scrub planned launch
Weather report for Sat
High 79
East wing 5 to 7mph, with gusts as high as 21mph

I know the general rule is don't over 20mph, but does that count for gusts 1mph over when steady wind is mild?
That kind of weather seems like heaven to the residents of Las Vegas Nevada. Here‘s are forecast for the rest of the week.
 

Attachments

KennB

I-95 Envoy
Joined
Mar 6, 2010
Messages
2,381
Reaction score
177
Location
Amesbury, MA
I registered with windy.com but not sure how to get altitude data.
On my computer, there is a vertical slide all the way over to the right that defaults to Surface. On my phone, I hit the three-bar menu button and scroll down to get to a horizontal slide for altitude.

Hope this helps.
 

jrap330

Retired Engineer, NAR # 76940
TRF Supporter
Joined
Jan 25, 2020
Messages
411
Reaction score
110
Location
NJ
"Are those surface winds or winds aloft? It could be 5 to 7 at surface but sustained 25 a few hundred feet up."
Don't know, the weather report did not specify.

I don't have the field measurements, it is a soccer practice field. I generally launch a few larger rockets like the Amazon on B engines and smaller ones - Mini Mosquito, Star Trooper, and the Mini Max on 1/4 A3-3T, 1/2A3-4T, and A3-4T.
Yes, do it..small engines..i do not consider 1/4 or 1/2 engines..... But when I have gust...I time it..my launches between gusts when it appears you will have a few minutes of peace...if at launch site you don't scrub it. If consider a B engine....keep it to altitude of 300 feet max. I won't not launch anything beyond that for fear it blows away to heaven.
 

jadebox

Roger Smith
TRF Sponsor
Joined
Jan 18, 2009
Messages
5,674
Reaction score
198
Here in Central Florida, the winds usually shift direction 180 degrees sometime in the early afternoon. So, even if it's windy in the morning and late afternoon, there's usually a period in the early afternoon when the winds die down.
 

jrap330

Retired Engineer, NAR # 76940
TRF Supporter
Joined
Jan 25, 2020
Messages
411
Reaction score
110
Location
NJ
Here in Central Florida, the winds usually shift direction 180 degrees sometime in the early afternoon. So, even if it's windy in the morning and late afternoon, there's usually a period in the early afternoon when the winds die down.
Yes, I would say that is true in all over.....the winds never state the same..especially in summer on East Coast (NJ) windy during day...good chance it dies down in evening. I
 

JimByrne

Member
Joined
Jul 19, 2020
Messages
14
Reaction score
8
It is almost always windy in Kingman Az. so I go early and take a chance but at least get out and try
 

Rocketclar

Well-Known Member
Joined
Aug 1, 2014
Messages
52
Reaction score
8
There is a NOAA site for predicting upper level wind directions and speeds vs just surface wind. Ron Parsons of my old Austin based club use to run these winds aloft sims for us. I now have run these before launches at my new home in IN to see if a higher altitude flight would risk going towards the power lines (a big no-no). The example shown in the attachment is for our site in Muncie. You can tweak for your conditions and constraints. There are times when the speed and direction of the upper winds are very different than the surface winds. https://www.dropbox.com/s/au6rk6n5wsvrlr4/Winds Aloft.pdf?dl=0
 
Top