HDTenEightyP/NetNews huggingface dataset:
From: svoboda@rtsg.mot.com (David Svoboda)
Subject: Re: Which Mechanical Retracts?
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Mon, 27 Jul 1992 19:58:41 GMT

In article <62728@cup.portal.com> sbixby@cup.portal.com (Steven W Bixby) writes:
|
|You might consider pneumatics - they are a little more expensive and take up
|more space, but they're really reliable and can be actuated with the cheapest
|(or lightest) servo you can find.  Weight wise, when you take out a heavy
|retract servo and it's linkages, and replace them with a lightweight air
|cylinder and almost weightless lines, it's only an ounce or so more weight.

Well, for mechanicals, you have the basic retract mechanism, pushrods, and a
retract servo which is no heavier than any other servo (modern retracts do not
need much muscle to actuate, and modern servos are strong--Robart demos their
mechanicals by actuating three of them (with heavy wheels) with a Futaba micro
servo).  Pneumatics require the same basic retract mechanism, plus actuator
pistons and cylinders, plus lines, plus a pressure tank, plus a valve, plus a
servo to actuate the valve.  Oh, and don't forget the filler valve, too.  Modern
pneumatics are almost always heavier and bulkier than mechanicals.

Also, mechanicals are VERY reliable, once you get the pushrod worked out.  They
will last, once sorted out, for as long as the airplane itself, in most cases.

Pneumatics have lines and valves which deteriorate.  If you use freon, the gas
removes the lubrication oil from the lines, and if you use compressed air, you
have to run at higher pressures, which causes the lines to fail after time.

Go to a pattern field on a regular basis and you will see that the reliability
of mechanical retracts is borne out.

On the other hand, it is difficult to adjust a mechanical retract perfectly.
At least it's more difficult than properly setting up a pneumatic.  Pneumatics
are more forgiving of binding.  For these reasons, pneumatic retracts are
often a good "first retract system" for many people.

|I'm sure there's some other opinions on the net.....?

Yup.

				Dave Svoboda, Palatine, IL
From: tmr@cs.bham.ac.uk (Tim M. Read)
Newsgroups: rec.models.rc
Subject: EC Cadet Diesal Engine..
Date: 22 Jul 92 12:34:29 GMT
Distribution: rec
Organization: School of Computer Science, University of Birmingham, UK

Does anyone know where I can get hold of an EC Cadet Diesal Engine -
specifically in the uk?

I am particularly interested in this motor, as I am told it is quiet compared
to other engines of its size...

Thanks,

 Tim

--
         --------------------------------------------------------
         `We see things not the way they are, but the way we are'        
         --------------------------------------------------------
From: klxtho01@uctvax.uct.ac.za
Newsgroups: rec.models.rc
Subject: Numerics for bigwig.geology.indiana.edu
Date: 23 Jul 92 08:33:56 +0200
Organization: University of Cape Town


Hi there,

I am new to this newsgroup, and I was hoping to get an answer from you guys.
(Yes, I have read the FAQ list) :-)

Well, reading the FAQ was actually where my problem began ... an anonymous
FTP site was mentioned "bigwig.geology.indiana.edu".  The server cannot find
this site, so can someone pleez gimme the numerics?

Thanx a lot.
Cheers,
Barry.
From: robertw@informix.com (Robert Weinberg)
Newsgroups: rec.models.rc
Subject: Re: HELP! Where's Futaba?
Date: 21 Jul 92 21:23:19 GMT
Organization: Informix Software, Inc.

In article <1992Jul21.132002.28675@linus.mitre.org> mmcevill@mitre.org (Michael  
A. McEvilley) writes:
> And as the other posters mentioned, you should get replacement servo gears 
> from a local hobby shop.
> 
> Michael

Right. I called Futaba, and they do not deal individual units - you have to go  
through a hobby shop. Actually, they sounded kinda cranky, even before I asked  
about getting a part.

--
+==============================+===============================+
|       Rob Weinberg           | Workstation publications tech |
| Email : robertw@informix.com |       Graphic designer        |
| Voice : 415-926-6754         |    <imagine your ad here>     |
+==============================+===============================+
From: gt9351c@prism.gatech.EDU (The Chowmeister)
Newsgroups: rec.models.rc
Subject: Re: consept 10
Date: 25 Jul 92 04:58:25 GMT
Organization: Georgia Institute of Technology

In article <1992Jul24.143412.23311@news.clarkson.edu> rob@phoenix.erc.clarkson.edu.rob writes:
>The consept 10 does "exploded" in mid air. The consept 10 has enough
>power to do most things when you wildly spin the head (like all helis)
>but when I was flying slowly stright and level the plastic root blade
>holder riped off the main shaft.. The damage was minimal considering,
>but it was strange to see the heli just fold inflight.
>
>I like the consept 10, but watch the overspeed of the head.
>

	Ah ha!  That exact same thing happen to me, about 5 weeks ago, with
  my Kalt Whisper!  The dmage wasn't bad either, just a caved in boom and 
  smashed tail shaft... about $80 worth of parts (what a shaft!)
	Anyway, I just used a pinion gear that was t notches more... and
  whamo!!  is exploded in midair, across the street.  it was performing
  wonderfully.. til then that is...  it had comparable pickup to a .30
  size bird!  anyway, I exceeded 1200 rpm. (my blades are 50g each - alot!)
  But now, I'm using the EP blades.. and going about 1800 rpm. *with about
  22g each blade!)  now it handles awesome, w/ more than 10 minutes of flight
  it is pretty good for an electric.  my mods are... EP blades, astro 
  flight FAI heli motor, autorotation gear, aluminum landing gear, and the most
  lightweight radio equipment available - including the single package
  futaba gyro...
	anyway, i'm glad you posted.. I thought I was the only one to
  have this !EXPLOSION!




-- 
David Chow  =)    I don't know half of you half as well as I should like and,
                  I like less than half of you half as well as you deserve.
Time flies like an arrow...				- Tolkien
Fruit flies like bananas...       Internet: gt9351c@prism.gatech.edu
From: billg@hpspdla.spd.HP.COM (Bill Gingras)
Date: Thu, 23 Jul 1992 19:37:49 GMT
Subject: Lunch-Time Slope in Palo Alto Area
Organization: HP Stanford Park - Palo Alto, CA
Newsgroups: rec.models.rc


Are there currently any slope flyers working in the Palo Alto area who
fun-fly on their lunch breaks?

About six years ago now, I used to see tiny specs floating around the
vicinity of Coyote Hill drive in Palo Alto around lunch time.  I finally
figured out that the "specs" in the sky were actually people flying
slope on their lunch breaks.  I wasn't into the hobby yet back then so I
never showed up there, although I always thought it was neat.  

Well, now I'm into the hobby but no longer see slopers out there any
more.  I was wondering if these people moved to another site or if
anyone reading this had any interest in this sort of thing.  

I posted this here in hopes that perhaps someone who used to fly back
then, or is interested now, might respond.  I apologize for wasting
bandwidth outside the PA area, but I still don't know how to limit the
range of postings.

- Bill G

From: earl@trsvax.tandy.com
Date: 21 Jul 92 11:26 CDT
Newsgroups: rec.models.rc
Subject: Re: Info on Goldberg Mirage 550... ?
Message-ID: <5000010@trsvax>
From: jck2@cbnewsg.cb.att.com (john.c.kelly)
Subject: magazine index
Organization: AT&T
Date: Fri, 24 Jul 1992 18:21:30 GMT

I'm sure someone with more time than I have has created an ASCII 
file of the topics covered in my favorite R/C rags.  Does anyone out
there know how I can contact that person?  Has anyone used such an
index?  

If no one has created one maybe we can collectively create one.

jck
From: pturner@sedona.intel.Com (Pete Turner)
Newsgroups: rec.models.rc
Subject: Re: WANTED:  r/c car and plane equipment
Keywords: r/c
Date: 31 Jul 92 15:56:38 GMT
Distribution: rec
Originator: pturner@nevin


In article <1992Jul23.221932.4293@hawkmoon.mn.org>, th@hawkmoon.mn.org (Tim Heimerl) writes:
|> Just like the subject states, r/c car and plane equipment wanted.
|> Send your asking price and specs and I will reply.
|> 
|> thank you

-- 

To All...

	Sorry for occupying your bandwidth, but...

To Tim:

	I've been trying to get a message to you, but in the last few
	days, our computer nets have been acting weird. Please reply
	to me directly at pturner@sedona.intel.com

-- 
 ______________________________________________________________________________

 Pete Turner              | "I'm not looking back -- but I want to look
 Intel Corporation        |  around me now"
 5000 W. Chandler Blvd.   |
 M/S CH3-36               |  -- Geddy Lee/Neil Peart
 Chandler, AZ 85226       | ---------------------------------------------------
 pturner@sedona.intel.com | "...yeah, I've been to Phoenix...they call that
 ATT: (602) 554-8906      |  place 'The Valley of the Sun'...they should call
 FAX: (602) 554-7281      |  it 'The Surface of the Sun'!..."
                          |
                          |  -- Some unknown late-night comic
 ______________________________________________________________________________
From: dankari@cats.ucsc.edu (DANKARI -YOUR SIRE!!!-)
Newsgroups: rec.models.rc
Subject: Kalt Whisper for sale....
Date: 23 Jul 92 05:13:40 GMT
Organization: University of California; Santa Cruz
NNTP-Posting-Host: si.ucsc.edu


FOR SALE:

UNCRASHED, perfect condition Kalt whisper.  

I have flown this little buzzer for about half a year now.  Good flyer, 
lightly aerobatic, and peppy.  Bit flimsy, like all the other Whisper
heli's though.  Three modifications.  All aluminum mixers at the rotor,
because the pastic ones kept biting the dust.  Reinforced gear, to prevent
that wonderful "Whisper wiggle" duting landing.  And a plain clear canopy.

Included:
Kalt Whisper - fully adjusted, RTF
Two 1300 MAh packs.
Charger. (of course)
JR FM 6 channel & accessories.

The radio has fail-safe included.  Also, I will throw in enough spare parts
to ALMOST build a second Whisper. (Yes, there is a chassis and motor and the
rest, The head is broken, and main shaft needs replacement.  If you want, you
can spend an extra $75 and have TWO whispers.)

Asking price : $600 OBO.  
Call (408) 475-5895 Weekdays 12-7pm PST
or Mail me -- Address below

-- 
-------------------------------------------------------------------------------
- |--\                              Bringer of doom, and you shall BOW to me! |
- |  |                              ||||  Dankari@cats.ucsc.edu -- *(8-> |||| |
- |--/ ANKARI!!!!                   The few, the PROUD, the totally INSANE!!! |
-------------------------------------------------------------------------------
From: co@bildsun1.mednet.gu.se (Christer Olsson)
Newsgroups: rec.models.rc
Subject: Re: 10 Cell F3E anyone?
Date: 24 Jul 92 14:19:23 GMT
Reply-To: co@bildsun1.mednet.gu.se (Christer Olsson)
Organization: MedNet, University of Gothenburg

Does the engine 520 watts with only 10 cells? Many engines works much better with 14 cells. 
My friend has a 750W Astro 40 and it works much better with 14 cells than 10 or 12 cells. 

He has tested the engine and the difference between 10 and 14 cells was great! The engine 
gives 650 watts with 14 cells but only 350 watts with 10 cells. 

Maybe the results should be differ if he has tested the most optional prop for 10 and 14
cells, now he only tested with same prop.
Newsgroups: rec.models.rc
From: djones@iex.iex.com
Subject: Props
Organization: IEX Corporation Inc.
Date: Wed, 22 Jul 1992 22:29:10 GMT

Can anyone explain in layman's terms what and or how one decides
which prop is proper for a particular engine or plane/engine combination.
In trying to get my Surpass 40 on my Flair Magnatillia broken in and running I
am trying various props. I started with a 11x6 Antique prop but the engine
didn't seem to be able to turn it very well. I am going to try a 11x5w, and did
try a 10x7. Isn't a 10x7 essentially the same thing as a 11x6? What does it
mean (from a practical standpoint) to 'go up in diameter and down in pitch or
visa versa'?

Thanks,
Doug

PS
If you want a great looking airplane that EVERYONE stops by and comments on,
get a Mag. It is a real ego trip to have everyone at the field on a given day
stop by and tell how good it looks, or nice it flies or how great it sounds!
Can't wait to build my SE5a!!

-------------------------------------------------------------------
'I am a traveler of                |    Douglas R. Jones
     both Time and Space'          |    IEX Corporation
       Led Zeppelin                |    (214)612-2600 ext: 325
                                   |    djones@iex.iex.com
                                   |    uunet!iex!djones
-------------------------------------------------------------------
From: tod@cs.washington.edu (Tod Amon)
Newsgroups: rec.models.rc
Subject: Expensive radios -- Airtronics Vision vs. ACE MicroPro
Date: 23 Jul 92 23:24:22 GMT
Organization: Computer Science & Engineering, U. of Washington, Seattle

I'm buying a new computer radio sometime in the next few days.  The decision
has come down to Ace MicroPro 8000 vs. Airtronics Vision.  I've heard from two
people with incredibly strong yet conflicting points of view.  Anyone else 
want to help me make this $500+ decision?  I fly sailplanes, have built two
planes, am planning on building more, and I want a radio for the future.
For many years to come I doubtless will be spending my money on other more
important things :=).     

If you have either one of these two radios, and have ever seen the other one,
what were your thoughts?  If you made a choice recently for a high-tech radio,
I'd appreciate any comments you want to share.  Thanks for your help.
-tod
From: sham@cs.arizona.edu (Shamim Zvonko Mohamed)
Newsgroups: rec.models.rc
Subject: Re: Hover achieved... with my Glider!
Date: 22 Jul 92 15:47:17 GMT
Distribution: na
Organization: U of Arizona CS Dept, Tucson

In article <1992Jul22.090149.12274@rice.edu> rusty@masc.rice.edu ( Robert Kelley) writes:
>I would like to call the net's attention to the line beginning, "I did have
>one nasty surprise, though."  This actually translates into about ten lines
>of mostly uninformative gibberish.  Will whoever this person's sysadmin is
>either compel it to mend its ways or remove it from the net?  RSK

HEY! Only decaf for you from now on! Sure, extra-loooong lines are a pain in
the butt, but we all mistakes, eh?

To add some r.m.c content to this article - I used to have a Drifter II that
somehow I managed to build well. I'd put it on the heavy-duty hi-start and give
it about 10lbs of pull (I think - I have a bad arm for estimating forces) and
let 'er rip! The wings would flex alarmingly, it would make a sort of moaning
howling sound but never did fold its wings.

And then I was at this contest in which I saw 4 planes fold wings. All on the
winch, near the end of the day as people got desperate when the lift started to
wane and the wind started to pick up. Luckily I was well out of the running by
then, and didn't feel like tempting the wind gods. That was one of the few
contests where I returned home with the same number of models I left with!

-s

PS - would the person using plotfoil for canoe sections send me email? I have a
fix for your problem.
--
The "Introduction to and Help with Radio Control Flying" file (aka FAQ or
"Frequently Asked Questions" file) can be obtained by anonymous ftp from
pit-manager.mit.edu; get /pub/usenet/news.answers/RC-flying-FAQ/part*
   If you don't have ftp, send mail to "mail-server@pit-manager.mit.edu" with
this message:
    send usenet/news.answers/RC-flying-FAQ/part1
    send usenet/news.answers/RC-flying-FAQ/part2

  Shamim Mohamed / {uunet,noao,cmcl2..}!arizona!shamim / shamim@cs.arizona.edu
 Member of the League for Programming Freedom - write to league@prep.ai.mit.edu
Newsgroups: rec.models.rc
From: bobwo@ecs.comm.mot.com (Bob Woodhouse)
Subject: Crystals AM & FM
Organization: secure_comm
Date: Thu, 23 Jul 1992 11:59:21 GMT

Hello,

I have ofeten seen advertisements for pairs of radio crystals in R/C
magazines where crystals marketed for AM radios sell for about $10
a pair and those marketed for FM radios sell for about $20 a pair,
all in the same ad.  Maybe the crystals really are different, but I
really doubt it.  In all the time I have played with crystals, a
crystal was pretty much a crystal, and maybe something like closeness
of actual frequency to nominal frequency or stability over temperature
changes could be real differences among various crystals.  It seems
far more likely that some marketeer decided that people with FM radios
are probably serious enough about their hobby that they will spend more 
money.  Who knows, maybe I am forgetting some crystal property that would
make some kind of crystal more suitable for AM and another crystal type
more suitable for FM.  Any thoughts on the matter could be of interest.

Bob "gee, am I gonna have to ask where all the r/c car posts are in order
     to stimulate r/c car posts" Woodhouse
From: bcoleman@hayes.com (Bill Coleman)
Newsgroups: rec.models.rc
Subject: Re: Crystals AM & FM: Factory Adjustment???
Date: 28 Jul 92 18:17:34 GMT
Organization: Hayes Microcomputer Products, Norcross, GA

In article <1992Jul25.085523.15647@leland.Stanford.EDU>, zimmer@calvin.stanford.edu (Andrew Zimmerman) writes:
>
> Futaba might just be protecting themselves by telling you to send it back to
> the factory. The FCC has different rules and regulations for each frequency
> band in the the spectrum.  
> For example:
>  53 MHz band - This band can be used by Amateur radio operators for
> radio control.  Output power must be under 1 watt, and the amateur's 
> call sign, name, and address must be on the transmitter.

Technically, there's no 1 watt limit in the 6 meter amatuer band. Amatuer
lincensees are permitted emissions up to 1000 watts on this band.

-- 
Bill Coleman, AA4LR                ! CIS: 76067,2327    AppleLink: D1958
Principal Software Engineer        ! Packet Radio: AA4LR @ W4QO
Hayes Microcomputer Products, Inc. ! UUCP: uunet!hayes!bcoleman
POB 105203 Atlanta, GA 30348 USA   ! Internet: bcoleman%hayes@uunet.uu.net
Disclaimer: "My employer doesn't pay me to have opinions."
Quote: "The same light shines on vineyards that makes deserts." -Steve Hackett.

Newsgroups: rec.models.rc
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Subject: Re: Taildraggers taking off (P-factor & Torque)
Organization: Indiana University
Date: Sat, 25 Jul 1992 04:37:58 GMT

In article <5808.2a6da0b4@hayes.com> bcoleman@hayes.com (Bill Coleman) writes:
>In article <Brr5K9.MID@usenet.ucs.indiana.edu>, ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:

>> Which is why one often can't have
>> unlimited vertical climb even if static thrust exceeds weight.

>Huh? I don't see how this is related to propeller performance.
>You can't change the laws of physics. In a vertical orientation,
>the primary forces acting on a plane are thrust, weight and DRAG.

This happens because dynamic thrust, especially at higher speeds,
is often less than static thrust. Thus the airplane slackens off
in speed, often to the point where it is directionally unstable.


>Even if thrust exceeds weight, you still have to have extra thrust to
>compensate drag. If thrust exceeds the sum of weight and drag, the
>aircraft will accellerate upward. If thrust is equal to that sum,
>the aircraft will continue upward at the same speed. (For the limited
>heights used by model aircraft, this would result in an "unlimited"
>vertical climb)

You forget to mention that the airplane should also have to fly 
up fast enough to be directionally stable. If your thrust decrea-
ses with speed, then the speed attained is less than the theo-
retical speed you'd obtain if you did your calculations with static 
thrust.


>> Which is why props can act as brakes in a dive.
>
>Props act as brakes in a dive because you are changing the angle of
>attack. As you move the plane faster than the prop, the AOA decreases,
>hence the induced drag decreases and the torque required decreases,
>so the prop spins faster. At some point, the engine can't spin any
>faster since the torque output decreases faster than the requirements.

>At this point, the engine resists further rotation. Even if the props
>are at a highly negative AOA (which results in a forward (spinward)
>pointing induced drag component), the engine can't turn any faster.

Right! And thrust decreases because you are changing the angle of 
attack.

If the prop is actually providing drag (since, as you say, the 
airspeed is so high that the blade is at negative AOA) then the 
prop can't be providing thrust, can it. I'd say that before this
happens the prop blades operate at ever decreasing angles of at-
tack as the airplane speeds up (and, as you mention, the engine
cannot produce more RPM). At some point the engine has unloaded
to its maximum RPM and beyond this the thrust produced by the
prop begins to decrease. 

I think we're actually saying the same thing, you have simply
decided to partition thrust into "theoretical thrust" and "drag"
components. 
-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
From: robertw@informix.com (Robert Weinberg)
Newsgroups: rec.models.rc
Subject: Re: Hover achieved... with my Glider!
Date: 22 Jul 92 14:18:57 GMT
Distribution: na
Organization: Informix Software, Inc.

In article <1992Jul22.090149.12274@rice.edu> rusty@masc.rice.edu ( Robert  
Kelley) writes:
> In article <1992Jul21.124330.26940@linus.mitre.org> m14494@mwvm.mitre.org  
(Mike White) writes:
> >Was out flying my Goldberg Electra last night.  Getting braver, and tried 
> >flying in something more than a flat calm.  The breeze was maybe 5 or 10 
> >mph, and there was a little bit of ridge lift comming over the top of a 
> >small rise.  With maybe 1/4 power, the Electra would just hover motionless 
> >about 20 feet up, for a minute at a time!  What a hoot!
> >
> >I did have one nasty surprise: I'm using the Futaba 4NBLE radio, the one  
with the electronic speed controller built into the receiver.  It works great,  
but... the radio has a thermal cutout, and when you operaten at low power  
levels for a while, the regulator chips heat up, and the the protection  
circuits shut down the motor.  So, it was quitting about halfway through each  
flight;  I had to land, let the receiver cool off, then launch and run the rest  
of the battery charge.  Think I'm going to put i
> >
> >
> >
> >air scoops to keep the receiver cooler.
> >
> >
> >
> >************************
> >* These are my opinions only.*
> >************************
> 
> 
> I would like to call the net's attention to the line beginning, "I did have
> one nasty surprise, though."  This actually translates into about ten lines
> of mostly uninformative gibberish.  Will whoever this person's sysadmin is
> either compel it to mend its ways or remove it from the net?  RSK

Interesting. At my site, Mike's comments came through loud, clear, and  
intelligible, with information that was important to me.

BTW, Robert, you can get good results, when complaining about posting technique  
and/or etiquette, by e-mailing to postmaster@whatever_site. This also prevents  
embarassing the individual on the net, and eliminates wasted bandwidth (of the  
kind I am creating here:>)
--
+==============================+===============================+
|       Rob Weinberg           | Workstation publications tech |
| Email : robertw@informix.com |       Graphic designer        |
| Voice : 415-926-6754         |    <imagine your ad here>     |
+==============================+===============================+
Newsgroups: rec.models.rc