phil alvirez's blog View Details
Archive for October, 2017
Posted by phil alvirez | Oct 20, 2017 @ 03:21 PM | 6,568 Views
i have talked about this issue several times. i watch fellows that do great while in the air: all kind of stunts and whatever happily. but when landing...is another story. there is a fellow at the club that comes with a big aerobatic plane and does whatever he wants. all kinds of stunts. am flying my gliders up there so i cant follow what he does, so i dont see how he makes the approach and what he does wrong, but every time he approaches mother earth its a disaster. he returns with the plane minus landing gear. with my gliders i try to land smooth and as close as possible, but i have reached a conclusion that it is better to have a good landing far away, than a nearby crash. and again, that flare-off idea of landing sometimes is not the most convenient. approaching with some speed and a little down elevator and sweep the ground instead so there is no floating and stalling works better. just consider it.
and above all, practice. if you fear it, perseverance is the key. you reach a time when it becomes natural. is like anything: you are learning. so, learn.
Posted by phil alvirez | Oct 18, 2017 @ 04:43 PM | 6,065 Views
soaring
am starting a discussion about soaring. please bring your experience on the issue or comments or follow-up.
according with dictionaries, soaring can be considered as climbing or staying up.
see:
soar
sr/Submit
verb
gerund or present participle: soaring
1-fly or rise high in the air.
"the bird spread its wings and soared into the air"
synonyms: fly, wing, ascend, climb, rise;
or:
2-maintain height in the air without flapping wings or using engine power.
"the gulls soared on the summery winds"
synonyms: glide, plane, float, drift, wheel, hover
"the gulls soared on the winds"

https://www.google.ca/search?hl=en&s....0.s3D66D2_p9Y
keep reading the comments below.
Posted by phil alvirez | Oct 06, 2017 @ 07:59 AM | 6,108 Views
have you wondered how bolts/screws/nuts are made?
i found this documentary very enlightening. i hope you will too:
How It's Made Nuts and bolts (4 min 29 sec)

Posted by phil alvirez | Oct 05, 2017 @ 11:16 AM | 5,914 Views
i have to tell you this: today at 8:00 in the morning, with clear sky, no wind down near the ground or up, launched my 2 meters electric power glider to 200 meters, stopped the motor and began to turn around searching for thermals. suddenly noticed a large number of small birds swarming above my plane. they were very high too, as far as i could see. flying fast in all directions, but always above my plane. if i flew it into another direction, there they went. it was not until my plane went below 60 meters that they dissappeared as fast as they appeared. every flight. i can not imagine how they came so fast on a sky that didnt show any few moments before.
perhaps they thought that i was into a thermal and decided to take a free ride? i can not think of anything else
i hope some have been in an experience like this, or has witnessed it, and could bring an explanation
as far as i have been told, they are swifts. here is more data from wiki:
https://www.google.ca/search?hl=en&s....0.eNNrU5Ckej8
Posted by phil alvirez | Oct 03, 2017 @ 10:02 AM | 7,178 Views
i am into thermaling. 2 meters electric powered. and i wonder why some birds-that are very good at thermaling-have short wide wings, and others, that are not thermal birds, have long narrow. examples of short are buzzards, eagles, haws, and long are albatross. perhaps because the short fly on the ground, and albatross over sea?
a link to short: https://www.google.ca/search?q=shape...w=1266&bih=558
and here albatross: https://www.google.ca/search?q=shape...w=1266&bih=556

seems that, after all, it is the way each flies. 1 using dynamic soaring, the other thermals.
read the comments; especially the latest.
Posted by phil alvirez | Oct 01, 2017 @ 10:47 PM | 5,980 Views
am starting this subject here at my blog.
i was running it on the open but got too many negative or non related posts so this way i can keep this clean.
it was here: https://www.rcgroups.com/forums/show...ing-efficiency
so, welcome all who want to follow up that thread
i said this at the beginning:
am starting a forum with the purpose of discussing the design to reduce the planes sinking speed.
the idea is that with the minimum sinking speed the plane may stay longer-and perhaps catch thermals easier.
please, only bring your experience or ideas related to the subject.
sinking speed
am bringing this from another thread, where we were discussing another subject:
"at the present time am performing tests to find out which is the optimum wing loading to stay up as long as possible for thermaling.
and building too light could make an airplane to sink faster after all. i have several 2 meters e-gliders, and the lightest flies noticeably slower, but that, even if very impressive, not necessarily means lower sinking speed. could be that it just does not penetrate enough.
the only thing that occurs to me is, besides timing them from same height in still air, is checking sinking speed and forward speed too. "
>>>after testing, i learned that the lighter, slower, sink faster, so after all, there is a limit that, if you go beyond certain weight, the plane just does not penetrate. period. but this can only be learned if you check the time from...Continue Reading