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December - 2003 It is getting COLDER and COLDER and... Today I wanted to check out a flying place for the F5J contest 1.Jan. But the temperature was -23 degrees here and "only" -19 down in the city. Why ? Well I had a theory that the town produces a lot of heat and that this creates a gigantic and solid thermal over the city. This thermal needs new air from the sides and thats why there are only "downwind" on my slopes in the valley. So were I was the wind was 2-3m/s straight into the town and it was freezing cold. I had taken with me some NiCd today as I had problems with LiPo's and NiMh. The same thing happened with the NiCd. 6 seconds motortime before they stopped. I had been thinking about why and had an idea of how to get rid of the auto-cutoff problem. I plugged the cell in and run the motor for a few seconds a couple of times - then disconected and connected immediately while the voltage on the cells were low. Now I did not have problem with auto-cut. I could have programmed the auto-cut away but as I am using the BEC I do not want to because of safety. So if you REALLY want to fly at these temperatures you either program away the cut-off or "cheat" the controller. And offcourse you charge the cells just before you are going to use them and keep them warm. I launched downwind and in high sink. But after 3-400m I was over the city and boy there was the thermal. It was more powerful than my theory and no more power was needed for the rest of the flying (I did no fly for long because of the VERY cold wind). For the record my Majko is equipped with Hacker B20/1:4, 13x8, Kontronik 40A controller. For batteries I have 3 alternatives: 2s2p 1320mah LiPo's or 8x1000Hecell or 10x500AR NiCd. |
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29.
December - 2003 Another day but now the temperature is -18 degrees... My poor Hecell's was not warm enough on the first climb so the motor did not run for more than 6 seconds. On the second run they started working so they need to get going and be warm in these low temperatures. As long as I was in the sun the flying was ok today. But my camera batteries did not like it in -18! After 15min of flying I packed and warmed my poor fingers :-) |
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December - 2003 Another day on the frozen lake with my Majko. There were plenty of others there also and the temperature were -6 degrees. A bit cold but hey we are vikings arent we ? My son Fredrik (6 years) also got to fly the Majko today. He was in the sky.. Got an email yesterday from Robert Burson in USA. He invited me to an F5J contest on New years day. I almost packed my bags but this is a postal competition so I can stay home and fly from here. The cool thing about this postal comp. is that one gets points according to the temperature outside on the flying day. So if I get -30 degrees I might win easy :-) Read more about it HERE or go thru www.liftzone.com in discussions, electric sailplanes, thread F5J EXTREME Contest
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December - 2003
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December - 2003
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December - 2003 - 100 years of powered flight
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Back to Slovakia at least in my mind. Karol Mrva the maker of the Majko has a great accommodation if one would like to go skiing, slope flying or Paragliding in the great mountains. Please visit his website if you are thinking of going for a vacation. Slovakia is very cheap and the house of Karol is also a cheap place to stay. BTW There are slopes and possibilities just 500m away.... http://www.kmrva.szm.sk
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December - 2003
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December - 2003
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January
- Not extremely much flying this month but many flights with many planes. Biggest
of the month was the new video "Pike-launch".
It should be well worth the download of 13,5mb You want back to Main page of the diary ? Or main page Jo Grini ? |