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轉載自Chatting about R/C Glider in Taiwan
台灣遙控滑翔機談天說地
Hi Soarers....
Sounds like the wind was quite strong, and the rotor (spinning air)
generated by the cliff was very strong. In this case, the rotor can come
back on itself and give the appearance of wind in both directions.
A way to tell, is to look for tell-tale signs such as smoke from chimneys
etc in the distance, to establish the REAL wind direction, then you know
that the 'other' wind direction you see is rotor wash coming back up the
cliff from behind.
This can happen a lot on 80-90 degree cliffs and can make landing impossible
without risk to the model. In this case it is very unwise to try to fly in
the rotor direction, and to try to do DS would be fatal.
The only other time this happens is when the hill tapers very much and the
wind is from a non-square direction but is unusual unless the hill is on its
own with no other hills around.
Hope it helps,
James.
James D. Hammond Ph.D
General Manager, ApplianceWare Asia Operations Center
Phone: 886-3-5165211
Fax: 886-3-5165213
Mobile: 886-0937243447
----- Original Message -----
From: "Jinn Tsai" <tjinn@ms28.hinet.net>
Sent: Monday, October 22, 2001 11:29 AM
Subject: Chatting about R/C Glider in Taiwan FW: Dear
RC Soarers (add)
>
> ----------
> From: deeamun@samsung.co.kr
> Subject: (營瞪??)Dear RC Soarers (add)
> Date: Sun, 21 Oct 2001 20:57:11 +0900
>
>
> Dear RC Soarers,
>
> It was quite strange that at top of mountain the wind was blowing from
both
> direction:
> from north and south. Anyone knows about this ?
>
> I went to west and south side of this mountain and found I could fly
there.
> Strange.
>
> The mountain is of oval shape on plan and standing on a flat land ...
>
>
> Best regards
>
> Hong-Soon Park
>
安全的飛行是最愉快的飛行http://www.geocities.com/tarcg/ |
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發表於 2001年10月26日 02:53 PM
