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- Newsgroups: rec.models.rc
- Path: sparky!uunet!panther!mothost!white!rtsg.mot.com!svoboda
- From: svoboda@rtsg.mot.com (David Svoboda)
- Subject: Re: National Sailplane Symposium - Trip report
- Message-ID: <1992Nov5.004627.1837@rtsg.mot.com>
- Sender: news@rtsg.mot.com
- Nntp-Posting-Host: guppie44
- Organization: Motorola Inc., Cellular Infrastructure Group
- References: <1992Nov3.181415.15932@nntpd.lkg.dec.com>
- Date: Thu, 5 Nov 1992 00:46:27 GMT
- Lines: 92
-
- Hey, first off, thanks for the GREAT trip report. You must
- take DARN good notes. :-)
-
- In article <1992Nov3.181415.15932@nntpd.lkg.dec.com> fisher@kay.enet.dec.com (kay::fisher) writes:
- |
- |Next
- |Terry Edmonds and Steve Metz on Full Size & R/C Sailplanes.
-
- Terry is a REAL interesting guy. He is from Iowa City, (I'm
- orginally from Cedar Rapids (Iowa), near there, and I have been
- seeing him and his straw hat at glider meets around there for as
- long as I can remember.
-
- |Steve Neu - Electrics
- |
- | Batteries get hot from inside out.
-
- I wonder if anyone has given a thought to internal liquid cooling
- for batteries. It would be a natural for boats, but I could also
- see an application for airplanes, for ground-based super-fastcharging.
-
- | The bottom line is there is this group working on telemetry devices
- | and a package that comes out about the size of a thermal sniffler.
- | Right now they are staying on a Ham band. I would hope that they
- | can conclude their work and release something for sale on non ham
- | bands eventually - but there doesn't seem to be any real commitment
- | to a product much less any fuzzy goals.
-
- I wonder if the no-code Tech license would cover this sort of
- transmission? Though I don't have one (yet), I have read the
- requirements, and it's basically a no-brainer.
-
- Any Hams want to comment?
-
- |Next
- |Maynard Hill - World Duration Record.
- |
- | It turns out that Maynard Hill set another longer duration record
- | between when they booked him for this presentation now. So I have
- | some data from both. Basically he used the same plane for both and
- | for the first record he landed with a lot of fuel on board.
-
- In 1982 or so the club that I was in successfully claimed the duration world
- record (of the time) from Mr. Hill, after several years of development, with
- a 25 hour flight. Two weeks later, Mr. Hill reclaimed the title with a flight
- an hour longer. Aaaaahhhhhh! :-)
-
- | He currently holds the worlds records for altitude = 26,990 feet.
- | 33.3 hours duration (the subject of this talk).
- | 150 MPH speed record. I don't know what class this is or if was
- | an old sailplane record that is no longer standing?
-
- I don't think it can be right. The current record is well over 250mph, with
- a glider (that's faster than the powered record--model props don't work too well
- at those sort of speeds).
-
- | Anyway details on the plane.
-
- | Flight Pack
- | .982 pounds w 4 servos
- | Rate Gyro
- | uCPU w altimeter sensor
- | 1 D Cell 3.6 volt Lithium 13 amp hour battery
- | Can run system with lights for 50 hours
- | 146 MHz Down link = postage stamp size
- | Normally used to mount on wildlife (a Falcon)
- | Hidden in the fin.
- | Wing tip Rx on 449 MHz Direction finding Receiver
-
- Hmm. He used to use an automatic wing leveler which employed some sort
- of electrostatic earth potential, with radioactive sensors at each
- wingtip (he cannibalized smoke detectors). No more?
-
- |Next
- |Professor Roland Stull - Meteorology for Model Sailplane Flyers
- |
- | Then he showed several other graphs including one showing the top of the
- | convective mixed layer altitude against time. This shows that thermals
- | don't exist at night [something we know to not be universally true] and
- | that they start in early morning and grow rapidly thru noon.
-
- Thermals, or something very much like them, certainly DO exist at night. The
- aforementioned duration record attempt ran into some problems when at about 2am
- the airplane hit a boomer thermal, and even idle couldn't get it back. It got
- WAY up there, before full throttle and a light dive brought it out.
-
- And although I have never done it, I know people who fly thermal sailplanes at
- night. It wouldn't be too much fun if there were no thermals.
-
- Again, thanks for the great report.
-
- Dave Svoboda
-