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Archive for October, 2021
Posted by phil alvirez | Oct 19, 2021 @ 12:40 PM | 15,198 Views
who can provide data on being chased by a hawk or whatever?
i ask because i got chased by a hawk.
i was flying my 2 meters electric glider midmorning. when climbing i noticed a bird following my plane but quit when i was near 200 meters.
then i got into a thermal for a while but when lost it and reached 100 meters here the bird came back, this time to remain following my plane and attacking it, sometimes getting very close. i changed direction but here it came until landed. the bird landed at a place so next flight i avoided that area and it did not chase my plane again.
could be that it was nesting?
any1 with experience with something similar is welcome.
here are some videos showing attacks:
speaking of hawks, once i made 2 planes that look like birds. 1 left it white (looks like a gull), and the other painted like a hawk. i quit flying it because as soon as i launched it, all birds disappeared.
Posted by phil alvirez | Oct 18, 2021 @ 06:57 AM | 20,045 Views
found this article on the differences interesting. i hope you find it too:
and this too:
well, from this thread i got some comments at the end that seems as it is not so good after all. look
Posted by phil alvirez | Oct 10, 2021 @ 07:46 AM | 31,720 Views
october 9, midmorning, about 20c (70f), 8 kph (5 mi) south wind, flat farmers land all over; 2 meters sailplane. climb to 200 meters (640 ft). vario tells climbing. so i turn and drift with wind until getting too far so turn back south. but then, flying on, straight facing the wind, plane remains at same level, or slight climb.
once back overhead, turn again, follow a cloud and catch another thermal, drifting with the wind and remain on it turning. over and over. later, noticed that flying straight facing the wind or drifting with it, the plane climbs slightly. tried other areas but cant find these conditions. is like a tunnel that runs along the wind where air is going up. this last over 40 minutes. then drifted over other areas. there was some buoyancy and the plane just didnt loose altitude.
when making the approach for landing, took some 10 minutes to land. sky most clear, few low level puffy clouds.
this is the 2nd ultrawhatever experience with non normal thermal conditions where the plane climbs even when not turning.
i hope some1 could bring experience with weird climbing air conditions.
here is the other experience:
Posted by phil alvirez | Jan 27, 2016
soaring: waves and stranger things: corridors
i want to talk about another source for lift, that i have learned recently. it is a narrow band across the wind.
more specifically:
corridor: a stationary invisible narrow band across the wind, that generates lift.
this happened to me at a flat field...Continue Reading
Posted by phil alvirez | Oct 01, 2021 @ 03:34 PM | 12,672 Views
it is a fact: they are here to stay.
they have their advantages and disadvantages. as everything.
what i would like to mention first is that you can run out of power and then the craft drops like a rock. if you are flying power (not gliders) you may notice a loss of power, but that may not give you time to return and land. and with gliders, that dont use the motor except for climbing, there is no way to know it.
if you fly with radios that dont have telemetry, you are at loss. and if your radio has it, then you have to learn how to program them. and that sometimes is burdensome.
then you have to know how to deal with the batteries, chargers, adaptors, connectors...
i have seen fellows that bring a car battery to recharge their batteries at the field!
and then, what size for your plane (capacity, dimensions and weight). what options. where to find them and at what prices (and shipping). at what rate to charge those.
and, as electrics start by just flipping a switch, they are dangerous. you HAVE to add another switch, or learn how to use 1 already in the transmitter, that you dont need or can substitute or live without that function. this way you have to activate it just before launching/taking off.
there is much more to add.
but these are the basic things to consider.
of course, internal combustion (engines) provide more power per weight, but with the increase in limitations due to noise pollution, sometimes there is no other way but electrics.
also, some like the easiness to fly them, as there are no possible problems: just flip the switch and the motor starts.
and for gliders, where you can start the motor any time, as when you drift too far and otherwise you will not be able to return to the field, or when you may fall short when landing, this is something you wouldnt even dream of.
for scale models, there are no engines protruding.