HDTenEightyP/NetNews huggingface dataset:
From: mkfeil@bcrki9.bnr.ca (Max Feil)
Newsgroups: rec.models.rc
Subject: Re: Taildraggers taking off (P-factor & Torque)
Date: 14 Aug 92 23:25:55 GMT
Reply-To: mkfeil@bcrki9.bnr.ca (Max Feil)
Organization: Bell-Northern Research, Ottawa, Canada

In previous articles (Bill Coleman) writes:
> Come on, the Space Shuttle demonstrates unlimited vertical climbs. An F15
> can climb 30K feet vertically with no problem. Why is it so hard to believe
> the same is possible for models? 

Note that rockets are true thrust motors, and jet engines are
nearly-true thrust motors. Props don't produce constant thrust since the
speed increase
of air going through the prop disk depends on how fast the incoming air is.
The thrust produced by rockets, and for the most part by jets, is constant
w.r.t. speed.
As far as vertical climbs go, nobody ever said that vertical acceleration
isn't possible in a model.

>If Thrust is GREATER than the sum of Weight and Drag, the airplane will NOT
>slow down.

Very true, but thrust is not a fixed quantity in a prop plane.

>> At zero AOA the plane is in free fall.
>Not at all. Zero AOA merely means the relative wind is coming straight on
>to the chord line of the wing. Depending on the shape of the wing, it
>could mean that the wing is producing considerable lift, or even producing
>a negative lift component. (Consider the case of a flat-bottom airfoil
>flying inverted at a zero AOA)

You're picking nits. What I meant to say was "At zero lift AOA..." 

See you later...
Max
--
Max Feil  mkfeil@bnr.ca | Disclaimer:
Bell-Northern Research  |   What do I know? I'm just a Nerd on the Big Ranch.
P.O Box 3511 Station C, |
Ottawa, Ontario, Canada.| "Enrich The Soil, Not EveryBody's Goal" -Peter
Gabriel
From: mmcevill@mitre.org (Michael A. McEvilley)
Newsgroups: rec.models.rc
Subject: Re: Foam Cores
Date: 19 Aug 92 18:13:18 GMT
Organization: The MITRE Corporation

In article <1992Aug18.214800.1782@iex.uucp> djones@iex.iex.com writes:
> I am expecting my foam cores from Wing Mfg to show up most any moment. 
These
> cores will form the wing for my Jensen Stick. Having never worked with 
foam
> before I am curious what folks use to cover them. I have considered the
> following options:
> 
> 1) Completely sheeting them with 1/16" balsa and the using Monokote.
 The easiest/quickest thing to do.  

> 2) Completely sheeting them with 1/16" balsa and then glassing and
>    painting.
Most durable approach but also the most work.

> 3) Using leading and trailing edge 1/16" balsa sheeting with cap 
>    strips and then covering with Monokote.
Will save some weight, some guys actually cut out the foam between the cap 
strips resulting in a 'built-up' looking foam wing. Too much cutting will sacrifice strength and will require reinforcement of the wing along the area where the wing spar would go.  

> 4) Glassing over the raw cores and then painting.
Not a good idea unless you are going to reinforce the wing with lite-ply, 
heavy balsa, or carbon fiber spars.
 
> If I should try glassing (something I have never done before...at least 
not
> like this) what weight of glass? And do I use epoxy thinned or polyester 
resin?
You should use .56 oz or .75 glass cloth.  I get mine from Aerospace 
Composites, but there are many other sources including K&B .75 oz cloth. 

Finishing epoxies are formulated just for fiberglassing purposes.   ZAP, 
Bob Smith, HobbyPoxy,  have resins of this type.  I'm sure there are 
others.  No need to thin epoxy of this type.  Forget about the polyester stuff.
> 
> What are the techniques that have been tried. Please post or send
> email and I will post a summary.
I will try to find info on this thread from about 6 months ago. 

Note: do not use regular CA on the foam cores, it will melt them.  I like 
to use the odorless, foam-safe type CA for attaching wingtips and 
leading/trailing edge balsa to the foam after sheeting. 


Michael
Newsgroups: rec.models.rc
From: sbbrown@magnus.acs.ohio-state.edu (Stephen B. Brown)
Subject: Re: ESCs - brake transistors - why?
Organization: The Ohio State University Radio Observatory
Date: Thu, 20 Aug 1992 16:25:18 GMT

In article <1992Aug19.213712.25560@proton.llumc.edu> borodin@hope.llumc.edu (Sergi Borodin) writes:
> Since the law of the conservation of energy still applies, 
> the current supplied by the motor cannot exceed the current had been
> applied to it by the drivers, e.g A&D or B&C. So transistors cannot
> be damaged (besides the pulse current is much higher).

      These two sentences seem to contradict one another.  More
importantly, the law of conservation of energy doesn't apply because
current is not energy.  It's an energy rate.  True, you can't get more
energy out of the motor than is stored in it (as magnetic field in the
windings, and as rotational inertia in the rotor) but you might get it
out faster than you put it in.  Consider the batteries you use, which
you might charge in hours (unless you have a fast charger) but will
discharge in a few minutes of heavy use.
      Fortunately, the motor windings are inductive rather than
capacitive, so the inductance will try to discharge at constant
current.  However, they can generate very high voltages to try to
maintain this current, so they might exceed the safe ratings of the
FETs.
      My education about DC motors as generators is lost in the mists
of antiquity (perhaps another net reader is more current?), but I think
that the mechanical energy will be dissipated in a similar
manner--i.e., it will try to generate constant current, proportional to
rotor speed, but the voltages are unknown.
-- 
Steve Brown, N8HFI              sbbrown@magnus.acs.ohio-state.edu
Chief Engineer, The Ohio State University Radio Observatory ("Big Ear")
From: lew@4ccvw46.scg.hac.com (Lyman Lew)
Newsgroups: rec.models.rc
Subject: Re: Puma engines?
Date: 18 Aug 92 20:09:55 GMT
Reply-To: lew@4ccvw46.UUCP (Lyman Lew)
Organization: Hughes Aircraft Co., El Segundo, CA

In article <Bt6r4t.Dn6@usenet.ucs.indiana.edu> ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
>In article <22918@hacgate.SCG.HAC.COM> lew@4ccvw25.UUCP (Lyman Lew) writes:
>> <Some stuff I wrote previously, now deleted>
>>Wow, if the motors were that cheap, I'll start flying FAI Combat! 8-)
>
>Hmmmm... thing is these days the only things competitive are the 
>lightweight Russian engines and the special rear intake Nelson
>2.5s with the titanium cranks. You get the idea  8-)
>
Ugh, another case where if I don't have the latest and greatest,
(greatest=$$$$) I'll just end up being shark bait for the combat
guys 8-(
>
>However there is absolutely nothing to prevent you from getting 
>together with your club mates and building a bunch of Gotcha 
>400s, sticking PUMA .15s on them and flying them on .015x52'
>lines. FAI airplanes are probably the most fun to fly. They are 
>light and agile. 
>
>Hmmm mebbe I'll buy one anyhow...
>
Not if I buy one first ;-) But seriously, there are a lot of cheap
foreign .15's out there from India, China, etc. you might want to
check out. I seen a few through Carlson Imports in Arizona. He has
a catalog and carries a wide range of motors from Great Britain,
Russia, Czech., etc.


Lyman Lew, lew@caesi.scg.hac.com
From: johns@hp-ptp.ptp.hp.com (John Schubert)
Newsgroups: rec.models.rc
Subject: Bayside R/C Club
Date: 14 Aug 92 21:19:27 GMT
Organization: HP Pacific Technology Park - Sunnyvale, Ca.


     
 
 
                       2nd Annual Hobby Flea Market
                                     
                              Sat. Sept 19th
                                8:00 - 2:00
                                     
                             Bayside R/C Club
                              Fremont, Calif.
                                     
                         Grimmer and Warm Springs
                          for info: (408)379-2520
                                     
                                     
                     Sellers: $15.00 per 15x15 space.
                                     
                                     
                      Lunch: Hamburgers and Hot Dogs
                                     
                              Raffle at 1:00
                                     
                Helicopter and other flying demonstrations.
Newsgroups: rec.models.rc
From: mark@ssd.intel.com (Mark Rogers)
Subject: ROAR Off-Road Naionals
Organization: Supercomputer Systems Divison, Intel Corp.
Date: Thu, 13 Aug 1992 17:27:54 GMT

Hello,

Did anyone have the pleasure?? of attending the Roar Nats in Dallas last week?
My fellow racers there have told me that there were some problems with the race.
Any hear anything?

Mark
-- 


Mark Rogers

mark@ssd.intel.com
1-800-421-2823
FAX: (503)629-9147
From: frankfx@volkswagon.EBay.Sun.COM (Joe Fenech)
Newsgroups: rec.models.rc
Subject: Re: Switching to Ailerons -- How easy?
Date: 19 Aug 92 00:14:52 GMT
Reply-To: frankfx@volkswagon.EBay.Sun.COM
Distribution: world
Organization: Sun Microsystems, Inc.
NNTP-Posting-Host: volkswagon.ebay.sun.com



I have a similar situation. I have been flying my Gentle 
Lady for 3 months off a local cliff over the Pacific. Things
are going well...loops, intert at the top for a few seconds,
close passes without ducking, and landings....

I have a Ninja in the wings standing by. I am dying to take
my first flight, but the aileron question and the abrupt 
increase in speed has me guessing about when I can go ahead
and fly. 

Any input from seasoned slope soars would be greatly welcomed
and studied!

Joe Fenech
San Bruno, CA

In article 27800@beaver.cs.washington.edu, tod@cs.washington.edu (Tod Amon) writes:
> Any words of wisdom on switching from a a polyhedral based glider
> to my almost finished Chuperosa with 7032 and ailerons?  How easy
> is it to make a fatal mistake when just learning to fly with
> ailerons?  After putting so many hours into my new plane, you'd be
> right if you thought I was a bit nervous to actually go fly it!
> 
> Thanks.
> -tod 
Newsgroups: rec.models.rc
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Newsgroups: rec.models.rc
Subject: Re: COMBAT.GIF
Date: 23 Aug 92 02:26:11 GMT
Distribution: rec.models.rc
Organization: Indiana University

In article <LARRY.92Aug20143355@peak.psl.nmsu.edu> larry@peak.psl.nmsu.edu (Evil Engineer doin' it the Cowboy Way) writes:
>Hilarious! Great cartoon, Iskandar.
>
>Hill can really draw. Got any more like that?


Yup! I'll have to dig up my old MACA newsletters....





-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
From: bingham@hpnmdla.sr.hp.com (David Bingham)
Date: Thu, 13 Aug 1992 22:14:12 GMT
Subject: Re: SAE Contest in MODEL AVIATION
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: rec.models.rc

Earlier I wrote:

>      There's a 3 or 4 page article in the current Flying Models (or is it
>    Model Builder?...). Quite a few good pictures and a good article. I'll
>    grab the article and lunch and post some more specifics later.

It's the September issue of Model Builder. Four page article with pictures.
Newsgroups: rec.models.rc
From: soccer@cbnewsf.cb.att.com (clyde.a.hollister)
Subject: Hamliton Hobbies Phone number
Keywords: Phone number
Organization: AT&T
Date: Tue, 18 Aug 1992 18:18:24 GMT


Looking for the phone number of Hamilton Hobbies.
From: billg@hpspdla.spd.HP.COM (Bill Gingras)
Date: Wed, 19 Aug 1992 15:01:46 GMT
Subject: Re: Sophisticated Lady
Organization: HP Stanford Park - Palo Alto, CA
Newsgroups: rec.models.rc


I've also heard that the Tee Tail on the SL is very weak.  I don't own
one so I have no advice other than you'll probably want to fortify the
tail area somehow.

- Bill G

Newsgroups: rec.models.rc,rec.models.rockets
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Subject: Re: Very low thrust motors?
Organization: Indiana University
Date: Thu, 13 Aug 1992 16:06:14 GMT

In article <1992Aug12.222554.630@ttinews.tti.com> sorgatz@avatar.tti.com (sorgatz) writes:

>  Hi'ya! Contact Al Doyle at Doyle Jet. There is a newely formed 'Jetex II'
>company selling these items thru Doyle Jet. Al's got an ad in most every
>issue of 'Model Aviation'...and a nice newsletter too. Ciao!

No kidding! Someone posted in rec.models.rc that Jetex motors are available
through Peck Polymers too. Wonder if the larger ones are available too. 
There is also a newsletter called "Psst-off". I'm planning to make the big
FF Champs at Lawrenceville, IL (last year's Nats site) and will keep an eye 
out for Jetex activity. (I really want to catch Wakefield though!)

Does Doyle also sell pulse jets? These are truly incredible to watch. They
sound like a very loud trombone and do about 190-200 mph on 70 foot lines...
You need a really hefty flier like Billy Hughes to fly the things.


>ps-the infamous 'Jetex wick' burns as fast as I remember it..just a hair under
>MACH 1, unless you use less than 3" of the stuff..then it burns at WARP 8!! ;-


I paid Doc Passen (famous Combat flier) a visit last weekend. I mentioned
the Net and the discussions we were having about Jetex and he told me about
how he used to fly the things when he was younger. He said the darned fuses
kept breaking right where they went into the nozzle orifice. It would burn 
up to that point and stop. Quite a nuisance! I wonder if a loop of nichrome
or steel wire set off electrically would work better or if the nozzle isn't
too small to prevent short circuits...






-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
From: bcoleman@hayes.com (Bill Coleman)
Newsgroups: rec.models.rc
Subject: Re: Foam Cores
Date: 20 Aug 92 14:11:30 EDT
Organization: Hayes Microcomputer Products, Norcross, GA

In article <1992Aug18.214800.1782@iex.uucp>, djones@iex.iex.com writes:
> I am expecting my foam cores from Wing Mfg to show up most any moment. These
> cores will form the wing for my Jensen Stick. Having never worked with foam
> before I am curious what folks use to cover them. I have considered the
> following options:
> 
> 4) Glassing over the raw cores and then painting.
> 
> If I should try glassing (something I have never done before...at least not
> like this) what weight of glass? And do I use epoxy thinned or polyester resin?

For full-size planes, here's the technique we use for fiberglass over foam.

First, use a fairly slow-curing epoxy, the 30 min stuff is way too brittle.
The Saf-T-Poxy we use for full-scale planes takes about 8 hours to set,
24 to 48 hours to cure completely. It also likes being mixed at 30 degrees C.

Before putting glass down on the wing, mix a slurry of micro and epoxy. The
micro is used to fill the little holes in the foam, which would otherwise
fill with (heavy) epoxy. 

Lay the glass down, then pour or paint enough epoxy to wet it and drive all
the bubbles out. Repeat for however many layers of glass is needed. 

On the last layer, squeegee off any excess epoxy. You can also put on a layer
of dacron cloth. Dacron won't stick to the epoxy, so you peel it off later,
after the epoxy cures. The Dacron does two things. First, it tends to
wick up the epoxy and keep it from pooling in one place, which helps to
keep the epoxy evenly distributed. Second, it leaves a slightly roughend 
surface, which is much easier to sand later to get a good finish (or to
epoxy something else to it)

Note that this entire procedure is for full-scale foam composite construction
of the type used for Rutan-like aircraft. There's no vacuum bagging or
autoclaving. The foam used is a high density blue polystyrene foam, which
has a much harder, even texture than the white puffy polystyrene used for
most models.

I haven't heard of anyone using this constructing technique for models. most
seem to sheet wings with balsa instead, then use 1 layer of glass and
epoxy to get a smooth finish. I suspect that this construction technique 
would yeild a substantially stronger (and heavier) wing.

One of these days, after I get more proficient with my RC ARF, I want to
give this technique a try on models.

-- 
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: usenet@inesc.pt (USENET News System)
Subject: Sophisticated Lady 
Summary: Soarer	 
Reply-To: jota@iguana.UUCP (Joao Pedro Martins)
Organization: INESC - Inst. Eng. Sistemas e Computadores, LISBOA, PORTUGAL.
Date: Tue, 18 Aug 1992 16:17:53 GMT

	I have recently bought a sophisticated Lady, and I'm about to 
start building it. I would like to know if there are any reported
errors in the kit, and solutions for those errors. I would also appreciate
any advices as to the flying caracteristics and handling of the model.

		Thax in advance.


*----------------------------------------------------------*
| Joao Pedro Martins, Lisboa, Portugal                     |
|                                                          |	
| "It's not the kill... It's the THRILL of the chase..."   |
| "F*** !" - Jean Claude Van Damme, "Cyborg"               |
*----------------------------------------------------------*
Newsgroups: rec.models.rc
From: paulm@paulsun.UUCP (Paul Moreau)
Subject: Re: AM vs FM AGAIN? - Have Mercy
Organization: Storage Concepts, Inc.
Date: Mon, 17 Aug 1992 13:21:02 GMT


In article <15680022@hpspdla.spd.HP.COM>, billg@hpspdla.spd.HP.COM (Bill Gingras) writes:
|> 
|> I know there have been lots of discussions lately on the net concerning
|> AM versus FM, but the topic has been of no interest to me until now so I
|> haven't been reading up on it.  Please bear with me when reading this
|> question for the umpteenth time.
|> 
|> Basically, I've had an Airtronics FM radio system on backorder for about
|> a month now.  I called Airtronics yesterday and they informed me that
|> some parts are on backorder and they should get them in another 1 to 1.5
|> months.  I figure that by the time they get the parts, build the radios,
|> ship them to Tower, and Tower ships it to me, it will be at least 2 more
|> months.
|> 
|> Well, Futaba also sells a micro system, but it is AM.  So now the big
|> question.....
|> 
|> IS AM SO MUCH WORSE THAN FM THAT I SHOULD WAIT TWO AT LEAST TWO MONTHS
|> FOR THE FM SYSTEM?
|> 
|> I know AM has more of a problem with noise, etc, but has anybody read,
|> heard, seen anything that would convince me to wait for FM or go with
|> the AM?
|> 
|> Thanks in advance!!
|> 
|> - Bill G

   I have 3 AM, 4 FM, and 1 PCM (7UAP) and I never use my AM's anymore.
   One of the places I fly is near a street and more that once my plane
   has gone berzerk when an old beat-up car has gone by while using my
   AM setups.   If you've ever heard an RC radio's signal on a TV channel
   (Try tuning to 3-4-5 with rabbit ears and turn on you Xmiter) the signal
   sounds like a low freq buzzing.   Now go turn on your car radio to an AM
   station and drive around.   Occationaly you'll get buzzing and poping
   sounds generated by some car's noisy ignition system.  This noise is
   is heard by your reciever wich tries to decode them into servo position
   info and can cause your servos to twitch or in on instance I had, go
   totaly berzerk end in the loss of a good plane.    If I were to
   fly out in the middle of nowhere I'ld use my AM but I know of no place
   around where I live.

   BTW:  Not to start another 'holy war' but I use my 7UAP in PPM mode
         only .... :^)

-- 
          _____________________________________________________________
          -                *                      _______   _~;       -
          -            Paul Moreau               |       =_= /        -
          -    Sr. Diagnostics Software Eng.     \   USA    /         -
          -         Irvine, California      --->  *-_  ___ /          -
          -     UUCP: ..!uunet!storcon!paulm         \/   \\          -
          _____________________________________________________________

Newsgroups: rec.models.rc
From: lesnyd@monsanto.com (Larry E. Snyder)
Subject: Re: Question about Diesels
Organization: DSC
Distribution: na
Date: Mon, 17 Aug 1992 20:08:55 GMT

In article <1992Aug17.185938.4680@linus.mitre.org>, m14494@mwvm.mitre.org (Mike White) writes:
> 
> I've been away from RC modeling for a while, 
> and I'm pretty out of date.  I'm catching up, but
> I've been seeing ads for diesel model engines, and
> I'm wondering what the little hickey on the top of
> the engine head is.  It looks like a screw-in plug of
> some sort that goes where the glow plug ought to be.
> What is that?  How does it work?  Any enlightenment
> will be greatly appreciated.  Thanks.
>

That doohickey is used to control the compression in the cylinder. Since
diesels get ALL of their ignition from compression, this is a critical
adjustment...
 
> (signed)
> Reeling from RC culture shock
> 
> ************************
> * These are my opinions only.*
> ************************
> 
>
From: jrp@bohra.cpg.oz.au (John Pitman)
Newsgroups: rec.models.rc
Subject: Tuned pipes
Date: 19 Aug 92 22:32:05 GMT
Article-I.D.: bohra.9208190732.AA16013
Organization: Indiana University
X-Mailer: ELM [version 2.3 PL11]

Hi there,
This is partly a test post to see it it works somebody please let me know.
If you want tailor made tuned pipes for anything from baby to big we can do
it! Alloy from .25 size (2.3oz pipe) to .90 ducted fan to ST 2500 pipes and
headers. 
jp
From: ed@kronos.com (Ed Baker)
Newsgroups: rec.models.rc
Subject: Re: remote camera
Keywords: camera,plane
Date: 21 Aug 92 19:43:31 GMT
Organization: Kronos Inc. / Waltham, MA
Disclaimer: This posting is a personal opinion and not that of Kronos Inc.

Does anyone know where to get the small video transmitters?  HAM liscense
and camera are not a problem.  Thanks.
Newsgroups: rec.models.rc
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Heli fun-fly MI
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Distribution: na
Date: Wed, 19 Aug 1992 15:08:39 GMT
Summary: 5th annual heli fun-fly Aug22-23
Keywords: Heli fun-fly Michigan 

If you are interested in R/C helicopters at all and can make it to
the mid-west this weekend (22-23) you are invited to the Michiana
R/C Choppers 5th annual helicopter fun-fly. The location is the
Watervleit Airport at Watervliet Michigan .Watervliet is at the
intersection of I94 and M140 about 10 east of Benton Harbor and
Lake Michigan.




?????????????????????????????????????????????????????????????????????????????
! Mike DeMetz                                          -----|-----          !
! Secretary-Michiana R/C Choppers                   *>=====[_]L)            !
!                                                         -'-`-             !
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$