HDTenEightyP/NetNews huggingface dataset:
Newsgroups: rec.models.rc
Subject: Re: Radio dreams
From: kaiser@elec.canterbury.ac.nz (Chris Kaiser)
Date: 11 Sep 92 12:17:26 +1200
 l.COM><1992Sep10.103654.756@csc.canterbury.ac.nz> <ERICJ.92Sep9183214@calcutta.cfsat.Honeywell.COM>
Distribution: world
Organization: Electrical Engineering, University of Canterbury, New Zealand

In article <ERICJ.92Sep9183214@calcutta.cfsat.Honeywell.COM>, ericj@hwcae.Honeywell.COM (Eric Jacobsen) writes:
> In article <1992Sep10.103654.756@csc.canterbury.ac.nz> kaiser@elec.canterbury.ac.nz (Chris Kaiser) writes:
> 
>    > Another method, though is to use a spread spectrum technique where you don't
>    > really care (as much, anyway) about how much radios are interfering with
>    > each other. This also complicates ($$$$ again) the transmitter and receiver.
> 
>    Add to that that eash flier would have to have their own unique code, and there are
>    only a finite number of codes. Therefore you'd still have to have a control pegboard,
>    although it'd be a code control board rather than a frequency control board. Also, its
>    much easier (more idiot-proof?) to change a crystal than a spreading code.
> 
> Actually, I kinda thought you could use the garage-door-opener approach and just have
> a dip switch that lets you select a new code. This could be made much easier than a
> crystal change and wouldn't require a re-alignment or anything.

That's precisely the reason I put "idiot-proof" in the above. Given some of the people
that operate RC equipment (ground, sea and land), letting them set their own code thru
the use of multiple DIP switches is just asking for trouble...

A possible alternative would be plug-in patches with fixed codes, that way each code
could be identified and changed in a similar manner to crystals. Also, each patch would
just be an arrangement of links between pins, so they would be much cheaper than crystals.


Chris Kaiser

Postgrad, Elec. Eng. Dept.
University of Canterbury
Christchurch, NEW ZEALAND
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Newsgroups: rec.models.rc
Subject: Re: Engines - thermodynamics
Date: 12 Sep 92 19:38:59 GMT
Organization: Indiana University

In article <1992Sep11.010128.14306@bohra.cpg.oz.au> jrp@bohra.cpg.oz.au (John Pitman) writes:
>hi there,
>On the earlier thread about FAQ and engines, think about the following scenario:
>Take a petrol engine which operates at a given power output, at a stable
>temperature above ambient. Increase the compression ratio , and make the other
>necessary adjustments - increase octane of fuel as required, advance spark etc.
>This should produce more power from the same volume of fuel (?) - what will the
>stable operating temperature do , other things being equal (ie same ambient,
>humidity, radiator, water pump etc ) ???
>Conservation of energy says the temperature goes down, as the extra usable
>power has to come from somewhere ? WHat we have done is improve the volumetric
>efficiency of the motor, and I think the HP/LB/HOUR ( or reduce the lb/hp/hr).
>If the engine was initially under compressed, we wont need to alter the fuel to
>get an improvement at all, maybe only advance the spark a bit.
>
>any comments ? Dont know how t relates to model engines though?

I'm not sure whether the temperature would go up or down, but my
guess is that the added power in this case comes from added efficiency,
i.e. less unburned fuel gets spewed out the exhaust. In both cars and
model airplane engines an astonishing amount of fuel is wasted in this
manner, since leaner mixtures just won't ignite. This isn't thermody-
namic inefficiency, just plain old incomplete burning.

One thing car manufacturers did to improve gas mileage and emissions
back in the mid and late 70s was improve ignition systems to the point
where one could use larger spark plug gaps than before (typical plug
gap for the old points-based ignitions was like .035 - .040 inch. Its
more like .08 inch these days) and burn leaner mixtures. 







-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
Xref: sparky rec.models.rc:3763 news.answers:2891
From: barber@ad.enet.dec.com (ANDREW BARBER)
Newsgroups: rec.models.rc
Subject: Re: FAQ? (questions about engines)
Date: 9 Sep 92 14:27:37 GMT
Reply-To: barber@ad.enet.dec.com (ANDREW BARBER)
Organization: Digital Equipment Corporation


In article <1992Sep8.084215.2281@inland.com>, bloom@inland.com writes:
|>Path: ryn.mro4.dec.com!nntpd.lkg.dec.com!pa.dec.com!decwrl!spool.mu.edu!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!att!fang!gator!inland!bloom
|>From: bloom@inland.com
|>Newsgroups: rec.models.rc
|>Subject: Re: FAQ? (questions about engines)
|>Message-ID: <1992Sep8.084215.2281@inland.com>
|>Date: 8 Sep 92 08:42:15 CST
|>References: <1992Aug27.083734.2254@inland.com>  <1992Sep4.160330.21836@dcdwest.uucp>
|>Organization: Inland Steel Company; East Chicago, IN
|>Lines: 69
|>
|>In article <1992Sep4.160330.21836@dcdwest.uucp>, plb@dcdwest.uucp (Phil Blais) writes:
|>>>
|>>>
|>>>|>I don't think the laws of thermodynamics can be violated!  Nitro gives you 
|>>>|>more power thru more heat per power stroke.  Have you measured the 
|>>>|>head temperature of an engine running more nitro???  I'd bet a big dinner 
|>>>|>on this one.
|>>>|>
|>>>|>
|>>>The extra heat you get is just energy you can't use.  The ideal engine doesn't
|>>>get hot.  The exhaust should be cold.  This way, all energy is mechanical and none is used to heat up the exhaust gases.
|>>>
|>
|>If you took a thermodynamics class, you would know that there is not and 
|>never will be an ideal engine.  Internal combustion engines operate 
|>in the range of 30-40% efficiency.  This means that about 60-70% of 
|>the chemical energy of the fuel is wasted as heat and is not converted 
|>into mechanical energy of turning the prop.  To make your prop turn 
|>faster you add more heat (nitro).  Adding nitro does not increase the 
|>efficiency of your engine!
|>
|>
|>
Yes, I know an ideal engine is impossible (i didn't say it was)...I just cited
it as an extreme case to demonstrate my point about waste heat. I think nitro
has more energy per volume than the rest of the fuel.  In this manner, you are
going to get more energy out of every stroke.  This energy will be split 
bewteen excess heat (waste) and mechanical energy.  The ratio depends on how
the nitro burns.  I think nitro also burns faster (higher power per volume).


andy
Newsgroups: rec.models.rc
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: Dave Brown Flight Simulator
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Distribution: usa
Date: Wed, 09 Sep 1992 14:31:36 GMT

robertw@informix.com (Robert Weinberg) writes:

>In article <1992Sep08.132540.10100@syscon.rn.com> miked@syscon.rn.com (Mike DeMetz)  
>writes:
>> >I have the dave brown airplane flight simulator and have grown tired of it.
>> 
>> If you have the PC version you should just upgrade ($25) to the new
>> version which includes both and has much better(EGA) grahpics.


>Hmmm, is there a Macintosh version of same?
No. But there is a Mac version of Aerochopper but it is only for
the mono Macs. Aerochopper is a bit better than DBFS.

Newsgroups: rec.models.rc
From: ron@etch-eshop.Berkeley.EDU (Ronald Viegelahn)
Subject: 1/3 scale bipe for sale
Reply-To: ron@etch-eshop.Berkeley.EDU (Ronald Viegelahn)
Organization: University of California, Berkeley
Distribution: ca
Date: Fri, 11 Sep 1992 15:53:25 GMT



  I have a one third scale R/C Biplane that I have decided to
part with. This is a Bud Nosen model of a 1933 Gere sport
Biplane. It has a 96 inch wingspan, and a 28cc Mac engine.

 This is a mostly competed model.. the wings and tail surface's
are built and ready to cover. The fuselage is about 95% complete,
the motor mounts and landing gear are all in place. The fuelage
has been sheeted and shouldn't be much more to finish it.

 I have lost interest in this project due to the SIZE of this
airplane. It would make a good model for someone who is into
large scale planes.  I'd like to get $250.00 for it,but will
take offers.



				Ron Viegelahn

				ron@etcheshop.Berkeley.EDU

				(707)557-5671 H
				(510)642-4971 W
From: $stevee@sasb.byu.edu (Stephen Eldredge)
Newsgroups: rec.models.rc
Subject: Re: BUILDING PLANS FOR KAOS
Date: 14 Sep 92 22:53:39 GMT

In article <10512@disc.dla.mil> i001444@disc.dla.mil (james ogorek) writes:
>Subject: BUILDING PLANS FOR KAOS
>From: i001444@disc.dla.mil (james ogorek)
>Date: 14 Sep 92 14:46:35 GMT
>Looking for plans to build a KAOS using a 90 + size
>engine.
>.

I just saw plans for a 90 size KAOS in Model Airplane News Plans Directory.  
I don't have the number or price, but if you look in the back of any issue 
of MAN they have a toll-free number to AIR AGE who distribute MAN plans.  
The catalog is free for the asking (A 3.95 VALUE!!!) (no I don't work for 
MAN)  Anyway, a great catalog and I'm sure it has what your looking for.

PS I bought some 1/12 scale P-51D plans from them.  Excellent plans! A 
little slow in comming but arrived safe in a nice cardboard tube.

-Good Luck!

Steve Eldredge
From: $stevee@sasb.byu.edu (Stephen Eldredge)
Newsgroups: rec.models.rc
Subject: Re: Tantrum Folding Wing HLG Review
Date: 14 Sep 92 23:35:31 GMT

In article <15680025@hpspdla.spd.HP.COM> billg@hpspdla.spd.HP.COM (Bill Gingras) writes:
>Subject: Tantrum Folding Wing HLG Review
>From: billg@hpspdla.spd.HP.COM (Bill Gingras)
>Date: Mon, 14 Sep 1992 15:21:29 GMT
>
  I'll probably build a more conventional design,
>like a Skeeter, next (anybody have any experience with that kit?)
>
>- Bill G
>
Gotta tell ya about this one.  I just built Dynaflite's Skeeter this 
summer.  My first impression with this kit as I opened the box was that I 
had just stepped back in time to the beginning of kit history.  Not that the 
balsa had turned dark with age or anything like that, but after having built 
Goldbergs, Great Planes and the like, it was a bit archaic. Specifically the 
instructions were photocopied and stapled together, and they were very 
general without very many drawings or explanations.  If you have a few 
models under your belt though, you shouldn't run into anything that you can'
t handle.  Anyway enough of the bad, and on with the good.  The plans were 
surprisingly clear, and made up for the poor instructions in a lot of areas. 
I built this model with my twelve year old brother-in-law as his first plane 
and assembly was pretty straigt forward.
	One thing about this model is that the fuse is quite small and 
unless you have micro gear your standard servo's and batt will not fit.  
Something along the size of a Futaba S133 would fit comfortably.
	This model is mostly balsa kit with a few ply parts.  Be careful to 
think ahead while building. Some of the steps are much easier to accomplish 
while the plane is still in pieces than trying to remidy them later. IE: 
their were no pushrod holes drilled in the rear bulkhead and had I not 
noticed it I'm sure I would still be working with a sharpened coat hanger or 
something.
	We essetially had three days to finish this model and had I not 
given all the work to my B-I-L It could have been finished in less.  Wing 
build up is standard with no real problems. (Except for a few missing wing 
ribs) We finished the Skeeter in red white and blue, much like is shown on 
the box.  When finished it is a very clean looking airplane with sharp lines 
that are enhanced by its small size.	If you have the radio gear (which I 
don't as of yet so we haven't flown it) the Skeeter would be a cheap, sleek 
model that would get you out flying quickly before the nice weather is 
over.  I have seen it advertised for as little as $15.99 (hobby shack I 
think)

-Good Luck and let us know how it goes

Steve E.
From: bs464@cleveland.Freenet.Edu (Duncan R. McCoy)
Newsgroups: rec.models.rc
Subject: Re: What about Dynaflite ?
Date: 10 Sep 1992 23:32:49 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: bs464@cleveland.Freenet.Edu (Duncan R. McCoy)
NNTP-Posting-Host: hela.ins.cwru.edu


In a previous article, torsten@rnivh.rni.sub.org (Torsten Leibold) says:

>This company is quite famous for Fun Scale kits, at least here in
>Germany. BTW I'm just about finishing a .60 Mustang from them.
>Now, I've never seen more than about 2 or 3 articles in this group
>dealing with Dynaflite kits. Nor have I seen any ads or someone
>offering these kits in Model Airplane News. I wonder whether they have
>a bad reputation or what else is the problem with Dynaflite ?
>
>Bye,
>  Torsten.
>
>-- 
>+-----------------------------------------------------------------------------+
>|       Torsten Leibold, Hard- und Software, Viernheim, West Germany.         |
>|   UUCP: torsten@rnivh.rni.sub.org  ..!unido!cat!orfeo!rnihd!rnivh!torsten   |
>+-----------------------------------------------------------------------------+
>
Torsten - 

There are several guys at our field that fly Dynaflite airplanes - a
couple of fun scale Mustangs and a Butterfly. A fellow brought out a
fun scale Corsair a couple of years ago. These planes seem to fly well.
A friend has a .40-size Mustang which, he says, was difficult going
while shaping the inside of the cowl area. He also says that the quality
of wood supplied and die cutting were not up to the standards of some
other manufacturer's kits.

I've never built a Dynaflite airplane, so can't speak from personal
experience. I have, however, flown some for other people and there is
certainly no problem with the way their Mustangs fly.

In the states, Dynaflite kits can be had from most any of the big
mail order places - Tower, Omni, Sheldon's, Hobby Shack.

-- 
Duncan R. McCoy
Boulder City, NV
bs464@cleveland.freenet.edu
---------------------------
Newsgroups: rec.models.rc
From: ddm@hamby.tx.ncsu.edu (David Mann)
Subject: Standard RC Servo Data
Organization: North Carolina State University
X-Newsreader: Tin 1.1 PL4
Date: Tue, 8 Sep 1992 01:44:36 GMT

Can anyone tell me what voltage a standard servo (rc type) uses?  I want
to use servos for a project i'm building, but can't find any specs in my
mound of RC books, manuals, etc.  The servos are only 3 wires so i guess
i need voltage and pulse time, any info would be appreciated...

--
When you go in for a job interview, I think a good thing to ask is if they ever 
press charges.
                                                   -- A Deep Thought
David_Mann@ncsu.edu
From: fdi@wam.umd.edu (Thomas Lyden Wehrung)
Newsgroups: rec.models.rc
Subject: HPR launches near the DC area
Date: 15 Sep 92 18:28:23 GMT
Organization: University of Maryland, College Park

I am interested in advancing to HP level of rockets because I have outgrown
the smaller ones. I would really like to see what these HP rockets can do.
Does anybody know if there are any future HPR launches within driving
distance (preferrably less than 6 hours) of the Washington, D.C. area?

					Thomas Wehrung
Newsgroups: rec.models.rc
From: jtstaffo@eos.ncsu.edu (JEFFREY TODD STAFFORD)
Subject: Universal Joints
Organization: North Carolina State University, Project Eos
Distribution: usa
Date: Sat, 5 Sep 1992 16:38:21 GMT


  I'm working on an aircraft that requires a swept wing and leading edge
flaps.  Also, the outer surfaces must be clean.  Therefore, I need to extend
the control rods for the flaps On the inside of the wing into the fuselage.

  As a result, I'll have two control rods meeting at nearly 45 degree angles.
Is there any sort of universal joint that will allow me to connect the two
rods so that they may be controlled using a single servo.        
  
  Please send any ideas, suggestions, etc... to:

		jtstaffo@eos03a.eos.ncsu.edu

  Thank you very much,

Jeff
N.C. State
Aerospace Engineering

Newsgroups: rec.models.rc
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Subject: Re: Information Wanted on Very Miniature RC Planes, Cars and Boats
Organization: Indiana University
Date: Thu, 10 Sep 1992 04:20:56 GMT

In article <7SEP199213390218@rosie.uh.edu> st1ec@rosie.uh.edu (Tse, Oliver) writes:
>In article <Bu7s9o.JAp@usenet.ucs.indiana.edu>, ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes...
>>In article <3SEP199220374340@rosie.uh.edu> st1ec@rosie.uh.edu (Tse, Oliver) writes:
>>>In article <k9ln42=.noring@netcom.com>, noring@netcom.com (Jon Noring) writes...
>>I think someone is doing some serious leg-pulling here 9-)
>> 
>>I remember flying my 2-meter and these teenagers come along and one
>>of them says.."Oh thats nothing. Mine has little machine guns on it 
>>that kick up a bunch of dirt when you fire them..."
>> 
>>-- 
>>-------------------------------------------------------------------------------
>>Iskandar Taib                          | The only thing worse than Peach ala
>>Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
>>Bitnet:   NTAIB@IUBACS                 !
>
>
>Well, I suppose the only person whose pulling your leg is yourself!  Just 
>found the January/Febuary 1987 issue of SCALE SHIP MODELER and on page 40 the
>article "The Royal Navy's M-1 for R/C Combat" written by Cliff Shaw describes
>the 1/144 scale submarine with functioning gun he built.  In it he also has a 
>picture of a 1/144 scale torpedo boat he describes "with functional torpedo 
>tubes and full R/C capabilities for use in wargaming." 
>
>The 1/350 Lindberg Bismarck can be radio controlled.  Of course, none of the
>guns work.  You can sail it around your swimming pool and play with it as a 
>"toy."  Look for the article in SCALE SHIP MODELER of November 1989 by Paul 
>Spielberger.
>
>Better check your facts before you ramble about whose leg is being pulled!


Heh.. I suppose the moral here is never assume anything in a different field
than your own  9-)

Hopefully those functioning guns aren't too energetic.. lets see.. a 1/144
scale 16 inch battleship's rifle would be just about .12 caliber.....





-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
Xref: sparky rec.models.rc:3717 pnw.forsale:1725
From: chasej@bcstec.ca.boeing.com (James B. Chase)
Newsgroups: rec.models.rc,pnw.forsale
Subject: FOR SALE or TRADE: RC car 4x4
Keywords: 4x4 car, trade
Date: 10 Sep 92 19:56:57 GMT
Followup-To: poster
Distribution: na
Organization: Boeing Computer Services, Seattle


                FOR  SALE
        *Turbo Optima Mid SE

        *Four Wheel Drive
        *Graphite chassis with stretch kit
        *Kyosho 14-turn Precision Motor
        *Tekin 600 PXT Speed Control
        *Trinity 7 cell, 1700mAh saddle battery pack
        *KO Propo EX-5 Pistol Grip Radio
        *Robinson Pinions and Spurs
        *Bi-Level Rear Wing
        *Steadylift Car stand
        *2 Types of battery charger

ALL FOR  ONLY  $200.00 (you pay shipping) or TRADE for
Benchtop drillpress or a 4" or 6" by 48" beltsander.

If anybody is interested let me know, E-mail or whatever


James B. Chase             chasej@bcstec.boeing.com  ___ ___ ___ ___     ___
System Administrator         =+=+=+=+=+=+=+=+=+=    /__//  //__  /  /\ //  _
P.O. Box 24346  M.S. 64-25   =-=-=-=-=-=-=-=-=-=   /__//__//__ _/_ /  //__/
Seattle, WA 98124-0346  U.S.A  +1 206 237-6512        Computer Services

-- 
James B. Chase             chasej@bcstec.boeing.com  ___ ___ ___ ___     ___
System Administrator         =+=+=+=+=+=+=+=+=+=    /__//  //__  /  /\ //  _
P.O. Box 24346  M.S. 64-25   =-=-=-=-=-=-=-=-=-=   /__//__//__ _/_ /  //__/
Seattle, WA 98124-0346  U.S.A  +1 206 237-6512        Computer Services
From: jrp@bohra.cpg.oz.au (John Pitman)
Newsgroups: rec.models.rc
Subject: Engines - thermodynamics
Date: 11 Sep 92 01:01:28 GMT
Organization: Computer Power Software

hi there,
On the earlier thread about FAQ and engines, think about the following scenario:
Take a petrol engine which operates at a given power output, at a stable
temperature above ambient. Increase the compression ratio , and make the other
necessary adjustments - increase octane of fuel as required, advance spark etc.
This should produce more power from the same volume of fuel (?) - what will the
stable operating temperature do , other things being equal (ie same ambient,
humidity, radiator, water pump etc ) ???
Conservation of energy says the temperature goes down, as the extra usable
power has to come from somewhere ? WHat we have done is improve the volumetric
efficiency of the motor, and I think the HP/LB/HOUR ( or reduce the lb/hp/hr).
If the engine was initially under compressed, we wont need to alter the fuel to
get an improvement at all, maybe only advance the spark a bit.

any comments ? Dont know how t relates to model engines though?
jp
Newsgroups: rec.models.rc
From: paulm@storcon (Paul Moreau)
Subject: Re: Radio dreams
Organization: Storage Concepts, Inc.
Date: Thu, 10 Sep 1992 13:25:05 GMT


In article <1992Sep9.150729.4381@informix.com>, robertw@informix.com (Robert Weinberg) writes:
|> OK, set loose your electronic imagination.
|> 
|> SUPPOSE all transmitters used the SAME frequency, sending out packets of digitally  
|> encoded signals. The receiver would look for a packet addressed to it with a  
|> digital code, and only pay attention to that packet.
|> 
|> Everyone would have to time-share the same airwaves, so the packets would have to  
|> be brief, and there would have to be assurances that if there were, say, 25 planes  
|> up, nobody got bumped.
|> 
|> One way would be to have a transmitter in the plane as well, sending back a  
|> "received" signal, so that the pilot's transmitter would re-send until it got a  
|> "received" back. But that's expensive and adds weight, etc.
|> 
|> Instead, would it be possible to make the transmitted packets so brief that they  
|> could be broadcast repeatedly? Say, a .1 ms packet, sent every 5 ms, so that the  
|> chances of 4 or 5 packets in a row getting bumped by somebody elses radio would be  
|> small (true statistically?). That would assure that within 5x5 ms, or .025 seconds,  
|> a signal got received.
|> 
|> Another possibility: a crude receiver inside the transmitter box. The transmitter  
|> would wait until it could detect no transmission from other pilots, then send out  
|> its .1 ms burst. This way there would be a lot fewer signals in the air during any  
|> given second. If 20 pilots each needed to send out 20 signals per second, that  
|> would only occupy .1X20X20ms or 40ms of each second.
|> 
|> I am suggesting something like this instead of trying to eliminate interference  
|> between multiple frequencies.

   Interference between the same freqs?  Like 180 deg. phase cancelation?
   Now if all the Xmiter boxes just contained the Pulse info and connected
   to a single central Xmiter station, like a bunch of trainer boxes, I think
   your idea might work.
 
|> 
|> 
|> --
|> +================================+================================+
|> |         Rob Weinberg           |  Workstation publications tech |
|> |   Email : robertw@informix.com |        Graphic designer        |
|> |   Voice : 415-926-6754         |     <imagine your ad here>     |
|> +================================+================================+

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

Newsgroups: rec.models.rc