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    BHM and empty field Empty2019-07-12, 18:53 by Rich

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    BHM and empty field Empty2019-03-03, 23:44 by Charles E Cornes

    Saturday 7/7/18

    2018-07-07, 21:07 by Gary M Jones

    I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

    Farmer …

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    BHM and empty field Empty BHM and empty field

    Post by Tim on 2014-05-26, 19:46

    Arrived to sunshine and light breeze around 2.30PM and no-one there!
    Jem arrived shortly afterwards, and then Mel and Steve Price.
    First off I flew my Radjet 800 ( now fitted with a new receiver which seems to have fixed the erratic flight behaviour of last seasons later flights )
    Next up was the refurbished Electraglide which is now back to its normal well behaved self, and then we did some fun aerotowing with Steves Cub Tug, and my trusty 12oz Weasel. Then I had a couple of flights with the Bede.
    I tried a new phone app out "Hobby King Doppler" for speed measurement of the models, and although it seemed a bit fussy about flight direction, when it did record properly they were mostly quite consistent, and I got the following avg readings
    Radjet 108 MPH
    Bede 75-80 MPH
    Jems 450 Heli, a surprisingly fast 55MPH

    Its got a few issues that I will research, but all in all, pretty good fun for a couple of dollars  Very Happy 


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    BHM and empty field Empty Re: BHM and empty field

    Post by Mark Barnes on 2014-05-26, 22:17

    maybe a post before you went to the field would have brough more members out.

    I had a good day to
    BHM and empty field Img07910

    BHM and empty field Img08010

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    BHM and empty field Empty Re: BHM and empty field

    Post by Tim on 2014-05-26, 22:59

    Nice Pics Mark - Rhuddlan castle?

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    BHM and empty field Empty Re: BHM and empty field

    Post by Mark Barnes on 2014-05-27, 08:37

    only in the background

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    BHM and empty field Empty Re: BHM and empty field

    Post by Brian Colclough on 2014-05-27, 09:03

    St Mary's church in the foreground Wink

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    BHM and empty field Empty Re: BHM and empty field

    Post by Rich on 2014-05-27, 12:36

    Nice Sun on the way to set must have been late

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    BHM and empty field Empty Re: BHM and empty field

    Post by Mark Barnes on 2014-05-27, 13:46

    Rich wrote:Nice Sun on the way to set must have been late

    about 21.30 Rich from East end of the prom infront of The Marina Apartments, sat on the bench flying out over the sea wall. Mel on people watch, while eating a chippy tea.

    Them carbon props are smooth as silk BTW, not tried the other special yet but have it all mounted on the FPV quad, fits well to be fair will give it a wrirl tonight.

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    BHM and empty field Empty Re: BHM and empty field

    Post by Rich on 2014-05-27, 14:42

    Looks like you bought it then by the look of it

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    BHM and empty field Empty Re: BHM and empty field

    Post by Mark Barnes on 2014-05-27, 15:13

    has your gaypro arrived then has it lol

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    BHM and empty field Empty Re: BHM and empty field

    Post by Allan Patrick on 2014-05-27, 15:17

    Played about with speed measurement a few years ago using, I think, a German software product. It was not very easy to use but gave good results when you got it right. One had to record the sound with something - we found a pocket dictaphone worked quite well, then play the recording into a PC to digitise it and open it in Audacity using the FFT display (Fast Fourier Transform). Then using the cursor measure the approach and depart frequencies, input this manually into the prog and out would pop the answer. I'll look up the product when I get home

    To get good results you had to fly directly at the microphone, and past. This is because the doppler shift is for the sound coming from a source moving directly towards or away from you. Think of the doppler you hear from a vehicle if you are stood in a layby on a busy road - a large doppler - compared with the small doppler you get at the field pits from the cars on the road. Similar speeds but not directly towards/away to you. We found this decidedly hairy so put the dictaphone on a pole a safe distance away!

    There were two other major sources of error. The first was that the prop was not a reliable sound source as the revs change - hence audio frequency - as the speed changes. A slight dive into the approach or straightening out after turning in caused significant errors.
    To reduce errors due to revs changing I made a simple electronic circuit to drive an ordinary piezo sounder with 100Vac at 4 kHz to make it nice and loud. This sound was easily seen on the PC FFT display

    The second error was not flying in a straight line... One would easily, in reality, fly a big curve. The best solution we found was to set up the approach then to release the sticks and let the plane fly itself - fast and low - all good fun. If you touch the sticks the plane turns, drag changes , the speed changes and the errors appear. Especially if you are using the sound from the prop. The FFT display showed up these errors very clearly!

    It definitely all works but the physics means a lot of attention to detail. Perhaps a radar gun? Nevertheless all good fun for a couple of quid!
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    BHM and empty field Empty Re: BHM and empty field

    Post by Rich on 2014-05-27, 21:34

    Mark Barnes wrote:has your gaypro arrived then has it lol

    NO

    Not fussed about the trick piece of kit you have but I want my micro SD card back tomorrow.

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    BHM and empty field Empty Re: BHM and empty field

    Post by Mark Barnes on 2014-05-27, 21:54

    no probs,drop it off in the morning on the way through if your up, im rugby tomorrow night then london rest of the week

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