phil alvirez's blog View Details
Archive for September, 2015
Posted by phil alvirez | Sep 25, 2015 @ 12:50 PM | 7,597 Views
umx radian: https://www.rcgroups.com/forums/show....php?t=2089760
for those of you fans of the lil rad am starting a thread where am bringing the posts i have placed in my blog, that are scattered all over the several pages, so you don't have to search.
https://www.rcgroups.com/forums/show....php?t=2508435
Posted by phil alvirez | Sep 23, 2015 @ 08:42 AM | 6,939 Views
the only way i knew of going up without motor was with thermals.
(of course there is a way of staying up at a slope, but that is not the subject of this thread).
the purpose here is to seek for means to climb at a relatively flat field.
until recently i was of the idea that thermals were the only mean to do so, but when i moved to a new field, and got a vario that tells with beeps when the plane is climbing, i could search for lift and practically 'see' it as if it were painted in bright color. and then 1 day with clear sky my plane began to find lift in a long rectangular area across the field. there was a light breeze but lift was across it, not a circular pattern. i used it for as long as i wanted. it didn't move. it was an exhilarating experience. i couldn't believe my eyes-and my ears! i had to trim the plane down and drift far from the area to get out of it.
then i began to post at several forums and learned that it was a wave. there are several threads where i got answers.
eventually i moved them to my blog but now am starting this again here to see if there are more contributions and add data as i get it.will talk about my experience, but 1st will tell how is the place where i moved recently and am experiencing this: it is all flat farm land around, located at about 5 km (3 mi) at the north of a large lake, from where the wind blows most of the time. the 1st time i just explained it before, and for several days it didn't happen, until now again in clear sky, but this time stronger wind blowing from the north. and there were several waves that moved with the wind so i had to drift with them. altitude in both cases was about 200 meters (450 ft).
will bring more data as i find more experiences like this, but all polite, positive and to the point contributions are welcome.
Posted by phil alvirez | Sep 08, 2015 @ 08:23 AM | 7,145 Views
i have been an enthusiast about flying on thermals, since my days of free flight, and now more with sailplanes, radio and vario at my hand am having the time of my life.
i have been compiling data on the subject, and as i said, with the aid of the vario am learning still more about them.
as far as i knew, thermals form from the ground and rise to the condensation level and become clouds. their shape could be bubbles or a column.
but now on clear sky am getting some lift that i find in areas like waves that run across, like some clouds that are lines that run parallel. this i 'see' because am using a vario that sends beeps when the plane climbs.
has any1 experienced this?
is there any link about this?
for more details i started a thread here:
https://www.rcgroups.com/forums/show....php?t=2487246
and if you have any info please bring it here.
Posted by phil alvirez | Sep 08, 2015 @ 08:07 AM | 6,828 Views
for all that i have seen (in text and real life), thermals develop as bubbles or columns that rise to the condensation level, where become clouds.
but recently in clear air i have detected updrafts in the shape of waves that run across the wind, very much like sea waves. or should i say "sort of currents that keep the plane up there"?
is there any data on this?
please bring only links or positive, polite comments to the point.
regards

for more details, i started a thread here:
https://www.rcgroups.com/forums/show....php?t=2487256
Posted by phil alvirez | Sep 08, 2015 @ 08:00 AM | 6,272 Views
clear sky thermals
i have had my planes into thermals many times, be free flight towline gliders or rubber or engine powered, or r/c sailplanes.
so far i am under the impression that thermals rise from the ground in the shape of bubbles, although i could buy the idea that there are also columns. these bubbles or columns reach the level of condensation and form clouds. i have seen my planes reaching a cloud and being swallowed, so i believe this.
but what about a plane climbing into clear air? no clouds in sight?
this happens to me some times.
is there a source where we can learn about this?
meteorological data?
please bring any info here.
thanks
there has been some input at a thread here:
https://www.rcgroups.com/forums/show....php?t=2496179
Posted by phil alvirez | Sep 08, 2015 @ 07:59 AM | 6,204 Views
vario to detect thermals
am trying to learn from you guys who use a vario what is your experience on detecting thermals; what shapes have you detected;
their size, strenght, how they evolve as they rise, how they change their shape.
recently am beginning to use 1 and am trying to learn more about them. i consider that with a vario we have the way to learn more based on hard data. there are so many theories about them that i think this is the only way to clarify that.

any input based on your experience is welcome.
please comments polite, positive and to the point.

guys who use a vario.
for more details, i started a thread here: https://www.rcgroups.com/forums/show....php?t=2496772