HDTenEightyP/NetNews huggingface dataset:
From: fwing@leland.Stanford.EDU (Stephen James Morris)
Subject: Re: extensions from engine to propeller?
Organization: DSG, Stanford University, CA 94305, USA
Date: Tue, 15 Dec 92 05:58:39 GMT

Shaft extensions
>I would like peoples opinions and experiences on using a shaft
>to move the propeller farther in front of the engine (instead of
>'directly' in front of it).  I curious about problems this leads to
>also.

About 10 years ago I built a mid-engine canard design that used a .40
size engine.  The motor was 18" behind the propellor and the two were 
connected with a drive shaft running in ball bearings and a model boat 
universal joint at the engine shaft. This system works fine providing
everything runs true. I used a 0.25" steel rod for the drive shaft.
Care must be taken to avoid 'shaft whirl' which can occur with long
floppy shafts that are not correctly supported.

Steve Morris
Stanford, CA
 


Newsgroups: rec.models.rc
From: mgwheele@author.ecn.purdue.edu (Matthew G Wheeler)
Subject: Re: Checking Airborne Batteries
Organization: Purdue University Engineering Computer Network
Date: Fri, 11 Dec 1992 03:00:02 GMT

What I would like is a device that measured voltage of my battery pack
in flight.  It would have a red and green led, a calibration potentiometer
and a reset switch. The way I would like it to work is

	- Set threshold voltage with DVM and the pot (~= 4.8 V)
	- Push reset button
	- Green led lights
	- If the battery voltage drops below the threshold for more that 
          a few mSec then the red led would go on 
        - If the red led is on when I finish a flight I know I'm done
          flying for the day

This measures the battery voltage under the only loads that are important,
the in flight servo loads of the plane the battery is in. Doesn't this seem 
like the most rational way to check your batteries short of timming the
discharge? Does anyone see any problems with this idea?  I think I just
might build one unless one of you talks me out of it.

Matt
mgwheele@clausius.ecn.purdue.edu



Newsgroups: rec.models.rc
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: rumor: Lubbock may NOT be 93 Nats site..
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Distribution: rec.models.rc
Date: Thu, 17 Dec 1992 15:43:49 GMT
X-Newsreader: TIN [version 1.1 PL6]

I belive it said in the AMA mag that they still needed the FAA
permission and if they could not get it they would go back to
Lawernceville or Muncie.

Newsgroups: rec.models.rc
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: RC AH-64 Apache?
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Tue, 15 Dec 1992 13:04:01 GMT
X-Newsreader: TIN [version 1.1 PL6]

Helicopter World in CA (see ads in RCM) sells a fuse for 60 size machines.
I have heard it is not very scale. A company in AZ did the models for the
movie Firebirds. They bought these fuses and made them more scale. There
were supposed to sell a scale componets kit for the fuse as well as molding
a new one.
From: bloom@inland.com
Newsgroups: rec.models.rc
Subject: Re: YS61 LS and the Robart ultra fueler..
Date: 18 Dec 92 08:18:52 CST
Organization: Inland Steel Company; East Chicago, IN

In article <1992Dec17.155129.11804@sol.ctr.columbia.edu>, douglas@apache.ctr.columbia.edu (Paul Douglas) writes:
> Hi All,
> 
> 	I was going to install a Robart ultra fueler to allow me
> to fill my tank easily.  I chose this fueler because it automatically
> cuts off the back pressure from the engine to the tank.  The YS61 taps
> the crankcase pressure and as a result the back pressure to the tank is
> substantially greater than if the tap is taken from the muffler (as is 
> usually the case).
> 
> My question is has anyone used the ultra fueler with the YS61 LS?  I'm
> starting to wonder in the ultra fueler itself can withstand the extra
> pressure.. I would hate to install it and has to remove it a couple 
> months later from a fuel soaked fuse.
> 
> Also, what type of refueler do YS 2 stroke users generally employ?
> 
> Thanks
> Paul


The YS engines pump up the fuel tank to about 5-6 psi via a diaphragm 
pump with adjustable regulator ("idle mixture adjustment according to 
YS").  There is a 1 way valve in the pressure line to the tank to 
keep the tank pressure constant after the engine is running.  Most 
people who use YS use 1 of 2 methods for refueling. 
 1.  4 external bulkhead-style fuel nipples with an external line 
     for pressure and an external line for filling the tank. 

 2.  2 internal T-fittings (1 for each fuel line) with 1 leg of each T 
     connected with a fuel line that runs outside the fuselage.  The 2 
     external lines have removable plugs for refueling.


In both systems you have to have the break in the pressure line for 
refueling on the tank side of the 1 way pressure valve.  Otherwise 
you can't bleed the pressure prior to refueling and you wind up with 
a face full of fuel when you pull the fuel line.  I find that method 
#1 spills less fuel and is easier in practice for refueling, and 
method #2 looks neater.
Newsgroups: rec.models.rc
From: miked@syscon.rn.com (Mike DeMetz)
Subject: R/C Heli Clinc
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Thu, 17 Dec 1992 16:00:34 GMT
X-Newsreader: TIN [version 1.1 PL6]

If anyone in the mid-west is around Indy this Saturday there is an
r/c heli clinc and swap at R/C Sports in Carmel which is just north
of Indy. Its on old Meridian road in the Kirks furniture complex.

Newsgroups: rec.models.rc
From: jtg0707@uxa.cso.uiuc.edu (Jui Tien)
Subject: Beginner questions (again!)
Summary: some Beginner questions
Organization: University of Illinois at Urbana
Date: Fri, 18 Dec 1992 20:40:01 GMT
Keywords: rc

Holiday Greetings.

First of all, I like to thank all the people who were kind enough to mail me 
some beginner questions I posted a while back. I received quite a bit of mail
from the netters from engine selection to airplane/helicopter choices 
among the several copies of FAQ!
After pouring all that info, I still have some hopefully
not so beginner questions. Here they are:

	1. Among the engine recommendations I received, I get the most recomm.
	   for O.S. FP , follow by others such as Royal, Magnum...
	   The one thing that stands out is the fact that there seemed to be
	   just as many people that are for O.S. as there are people against
	   such brand as K&B and FOX. In fact, the dislike for either one
	  of these two brands is a little shocking!
	   (More like hatred sometimes!) 
	   Is there a good reason for this? What had either one of these 
	   two brands did to earn such bad reputation? 
	   I went down to the store to check out the engines, the K&B and FOX
	   do look less *polished* than the O.S. engines. Are they really
	   such bad engines?

	2. Question of durability vs. flyability.
	   Many people suggested that I should get planes such as U.S. Aircore
	   or something called *Duraplane* as beginner trainers. While others
	   suggested Balsa planes such as PT40 and the like. The prevailing
	   opionion is that Balsa planes fly much better but are very fragile.
	   The question is: how fragile is the Balsa planes? How much
	   flyability do I give up by going to the *industructable* planes?

By the way, I've decided to heed the advice and leave the helicopters for
later days.
Thanks in advance.
J.T.
12/18/92
From: johnson@charming.nrtc.northrop.com (Greg Johnson)
Newsgroups: rec.models.rc
Subject: Quest for heli power (was Re: Hobby Lobby Sport 500)
Date: 17 Dec 92 23:14:17 GMT
Reply-To: johnson@charming.nrtc.northrop.com (Greg Johnson)

In discussing R/C helis, putting different kinds of engines in helis,
etc., Mike Goza writes:

> By the way,
> the only reason I'm not running Enya 60's any more is that I went to
> Rossi 60 5 ports and a Vtech pipe for the ultimate quest for POWER!! ;)

I'm dying of curiousity:  what do you need the power for??  I've seen a
couple of heli applications that would require mondo power, and I am
in need of more ooomph at the moment also, for a particular application I
have in mind.

One clear application of power is drag racing.  I went to the June heli
fun fly in Bakersfield, Calif., and saw some really fine R/C heli drag
racing.  It was the highlight of the weekend.

The thing I need power for is hot dog weekend flying.  I have a Shuttle ZX
with a sort-of tired OS .32 engine.  I have a particular manuever I'm trying
to do, and some additional power would really help.  I get the heli hovering
in front of me, go to full throttle/collective, and then full right
cyclic.  The heli goes up and over to the right.  The next part is the
fun part:
go to full negative collective, and get the thing hovering inverted.  (U-shaped
throttle curve, of course.)

To learn this, I started 'way high and practiced the manuever until I could
do it OK.  Next, I took my heli to a flying site in Palos Verdes CA that has
a cliff right next to the R/C heli pad.  I stood at the edge of the cliff and
hovered the heli at eye level, but off the edge of the cliff, so that it was
maybe 200 feet high!  The perspective was completely different doing it eye
level versus doing it up in the sky.  The first 3 or 4 times, the heli went
bonkers, and was tumbling out of control down the cliff.  Managed to recover
the heli and fly it back up before it went subterranean at the bottom of the
cliff.  Then, the old mind clicked, and I could do it OK at eye level, at
least off the edge of the cliff!  Haven't gotten up the nerve to try it
at eye level on regular ground yet.

The problem is, when I hit full throttle/collective from a hover, my heli
just doesn't climb very snappily.  It kind of pathetically mushes upward.
I've got the high end as lean as I care to, and if I add any more high-end
pitch (I've only got about 7 degrees, in accordance with Mike Mas's
recommendation) the engine really bogs on transition from hover to climb.

Greg Johnson
johnson@nrtc.northrop.com
Newsgroups: rec.models.rc
From: rp105491@cc.tut.fi (Pirhonen Risto)
Subject: Re: Dog Fight Rules 
Keywords: Need Plans/Info
Organization: Tampere University of Technology, Finland
Date: Tue, 15 Dec 92 19:13:43 GMT



>
>******  RULES *****
>
>Mikael
> 

Can I really use .20 size engines in planes like Focke Wulf 190 or I-16 (Rata)
who has radial engines? 

Does anyone know where to get plans (blueprints or whatever) for those planes,
especially I-16? 
 

 












-- 
###############################################################################
| Risto Pirhonen			|				      |	
| Koneensuunnittelu 1229		|				      |
| puhelin				|	 			      |	
Newsgroups: rec.models.rc
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: Hobby Lobby Sport 500
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Thu, 17 Dec 1992 17:52:22 GMT
X-Newsreader: TIN [version 1.1 PL6]



In article <^n#@byu.edu> you wrote:
: 	The question here is, is this little bird worth the money?  How does 
: it hold up?  I notice that most of the parts are metal and they claim that 
: ball bearings are standard throughout.  
: 	Has anyone flown or built one of these machines?  Are parts 
: available?  Any info would be great.

Well a guy has flown helis for a long time told me the people that put
out that machine should be put in jail. I have only seen one, but never
flying. The initial cost is not important compared to the cost of maint. and
repair. Also HL is the only place in the US to get parts which is an important
point when choosing a heli. If they drop the line you are SOL. Go for a
Concept 30 or Enforcer or Shuttle ZX. If need be you can fly the Shuttle
with a four channel. Also many people are using airplane engines in their
Concepts. Make sure you get a BB Schurle ported one of .32 to .35.
: 
: Hobby Lobby also offers an electric Hughes 500D for $189 less $30 motor and $
: 60 battery.  I imagine this might not be the best machine to learn on, but 
: electric heli-flight seems very intruiging.  
The Kalt Whisper sells for a little more and is a better electric.



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

Lines: 55
Date: Wed, 16 Dec 92 16:44:53 MST
Newsgroups: rec.models.rc
From: $stevee@sasb.byu.edu (Stephen Eldredge)
Subject: Re: Slope gliders - recommendations for novices?

In article <1992Dec16.231529.18537@EE.Stanford.EDU> bencze@isl.Stanford.EDU (William J. Bencze) writes:
>Newsgroups: rec.models.rc
>Path: news.byu.edu!hamblin.math.byu.edu!sol.ctr.columbia.edu!spool.mu.edu!uunet!stanford.edu!EE.Stanford.EDU!isl!bencze
>From: bencze@isl.Stanford.EDU (William J. Bencze)
>Subject: Slope gliders - recommendations for novices?
>Message-ID: <1992Dec16.231529.18537@EE.Stanford.EDU>
>Sender: usenet@EE.Stanford.EDU (Usenet)
>Organization: Stanford University
>Date: Wed, 16 Dec 92 23:15:29 GMT
>Lines: 38
>
>  There's been a bit of discussion here about high-performance
>slope ships, especially the Sig Samurai, but how about a bit of
>net.wisdom regarding good aileron-and-elevator slopers for
>beginners?
>
>  I currently fly an Oly 650 off the slope and have a great time,
>but when the afternoon winds come up, I have to add *tons* of
>ballast to get the beast to penetrate at all.  Landing, too, is a
>chore without aileron control; the roll response is too slow for
>my dihedral ship in the turbulence near the hill. (anyone who has
>flown at the Coyote Hills site in Fremont, CA, knows about the
>afternoon gale conditons there)
>
>  So, any recommendations for a beginning sloper? I'm not looking
>for a ship capable of doing 720 degrees/sec roll rate or
>anything, but a machine that's stable, relatively docile, but
>able to do some basic maneuvers, such a rolls, inverted flight,
>and other "simple" things.
>
>  I'm currently looking at:
>
>   1. Coyote. (Bob Martin)
>   2. Kam-u.
>   3. Super Dragonfly.
>   4. Super Cheeta.
>    
>  Any of these too fast? too twitchy? too easily breakable?  Any horror
>stories? Are there other ships I should be looking at?  Thanks for the
>info!
>
>-Bill


How about the Ridge runt (alieron, elevetor) @ $17.99 or the super Ridge 
runt (A,E,R) for $27?  I have the Ridge Runt, still in the box but looks 
like it should fit your needs.  Certainly the right price from hobby shack.

>add< No-I-don't-work-for-them  >disclaimer<

Any one with experience on these kits?  I know the RR was out of stock for a 
couple of months so I know that someone should have one :>

Steve E.

Lines: 29
Date: Wed, 16 Dec 92 09:11:58 MST
Newsgroups: rec.models.rc
From: $stevee@sasb.byu.edu (Stephen Eldredge)
Subject: Hobby Lobby Sport 500

After reding all the great posts about helicopters an also due to a good 
friend's interest in getting into r/c heli's  I have become interested in 
giving it a try.  I don't plan on spending a lot of money on a new engine, 
heli, radio etc.  So when I read the ads for HL sport 500 that uses a 
normal .40-.45 airplane engine with a normal airplane radio -both of which I 
have-  all for a nominal price of $199  I became more than casually 
interested.  With no other equipment to purchase -except a gyro for the 
rudder,  This may be my way in.  With such a low entry cost I might even be 
able to afford a few repairs!! (ATTN STEVE BIXBY) :) :>..  
	 I know that this machine does not have collective, although it can 
be purchased with it, or as an add on, but that doesn't bother me too much 
because I don't think I'm going to get into chopperbatics, and autorotation 
as a begginer is probably an oxymoron.  ( I might be way off here, 
Helicopter people let me know!)
	The question here is, is this little bird worth the money?  How does 
it hold up?  I notice that most of the parts are metal and they claim that 
ball bearings are standard throughout.  
	Has anyone flown or built one of these machines?  Are parts 
available?  Any info would be great. 

Hobby Lobby also offers an electric Hughes 500D for $189 less $30 motor and $
60 battery.  I imagine this might not be the best machine to learn on, but 
electric heli-flight seems very intruiging.  

Any suggestions, comments?

Steve E.
From: tod@cco.caltech.edu (Tod Edward Kurt)
Newsgroups: rec.models.rc
Subject: YAQ: Electronic Speed Controls for RC cars
Date: 18 Dec 1992 21:28:48 GMT
Organization: California Institute of Technology, Pasadena
NNTP-Posting-Host: sandman.caltech.edu
Keywords: ESC, FET

Hi all,
	Well, I've had a little chance to look over the remarks about the speed
controllers.  Below is the design I'd like to go with.  I'd like anyone to tell
me if there's something fundamentally wrong with it.  The FETs I'm using are
International Rectifier's IRFLZ40.  These have an on resistance of 0.028 ohms
and turn on to this at only 5 volts.  Thus, they can be driven with standard
logic levels.
                    +V                             +V
                    ^                              ^
                    |                              |
                    +--+                        +--+
                    |  |                        |  |
                   _|  _                        _  |_
        1) o--+---|_   ^                        ^   _|---+--o (2
              |     |  |                        |  |     | 
              |     |  |                        |  |     |
              +-Z<]-+--+                        +--+-[>Z-+
                    |                              |                    
                    +------------( M )-------------+
                    |                              |
                    +--+                        +--+
                    |  |                        |  |
                   _|  _                        _  |_
        3) o--+---|_   ^                        ^   _|---+--o (4
              |     |  |                        |  |     | 
              |     |  |                        |  |     |
              +-Z<]-+--+                        +--+-[>Z-+
                    |                              |
                    V                              V                   
                   GND                            GND

where "-Z<]-" is a 10v zener diode, and the thing across each FET is a 
power Schottky diode.  As before, 1&4 on gives forward, 2&3 reverse, 3&4 
brakes.  The 10v zener is lower than in normal FET circuits because the turn 
on voltage is correspondingly lower.  Also, to get higher current drive 
for forward, I was planning on paralleling more FETS off of 1 & 3. Is 
this a sound idea?
	BTW, if this circuit is usable, the entire ESC will be quite small. I'm
using a microcontroller to do the driving (either a 68hc11 or 68705).  Even
with the rather large 'HC11, I think it will be 1.75" x 2.0".  Adding a couple
extra FETs shouldn't increase this size much.

	So, basically, I'm totally new to this whole power control stuff (my
forte is digital), and if anyone has any input on the validity of the above
circuit, I'd really appreciate it.

					Thanks, and Happy Holidays!
						Tod
							tkurt@vlsi.caltech.edu
From: msw@meaddata.com (Michael Walpole)
Newsgroups: rec.models.rc
Subject: Re: Gear drive & Prop
Date: 16 Dec 1992 22:04:26 GMT
Organization: Mead Data Central, Dayton OH
Distribution: usa
NNTP-Posting-Host: daedalus.meaddata.com

In article <Bz9C4q.87J@usenet.ucs.indiana.edu>, ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
|> In article <Byyzp8.G3o@inews.Intel.COM> user@machine.domain writes:
|> 
|> >Has anyone ever marketed a gear drive for gas engines?  Whatever
|> >advantage it gives to an electric motor should also apply to
|> >the gas engine.  (Or is it less weight to simply use a bigger
|> >engine that add a gearbox to a smaller one?)

I believe at onetime OS made a .60 with a gear drive.

|> There have been several used in competition that I've heard of. One
|> of the top Pattern fliers has a .60 on a belt reduction drive. There
|> have even been pictures of someone's (Dean Pappas'?) contrarotating 
|> prop setup - two gear or belt-driven .60s, one facing forward, the 
|> other backwards, driving concentric shafts.

Dean Koger has been flying a belt reduction drive for about 4 or 5
years.  This unit lets the engine run at 15K rpm while the prop turns
at 7K rpm.  The unit with the engine is a little lighter than a YS120.
I think the unit was designed by Wayne Ulery.  Wayne also designed and
built the Vortex, Dean's pattern plane.  Dean uses a highly modified Webra
.61 that with the unit turns a 16"x16" prop a 7K rpm.  Simalarly, a
YS120AC on 25% nitro will turn a 14"x14" prop approximately 8500 rpm.
The geared .61 2-stroke has more power than the 120 4-stroke.

The real interesting part is that a friend of mine built an exact copy
of the unit and used a YS61 instead of the Webra.  The YS61 had just
been rebuilt with new bearings and a Shadel piston and liner.  Once
the YS61 had been setup, it turned a 16"x16" prop the same rpm as the
Webra.

The unit consists of a frame that the engine mounts on and holds the
bearings for the pulleys.  There are two sets of pulleys and the total
gear reduction is about 2.25 to 1.  The belts used are standard cog
belts and the pulleys are cut off pulley bar stock.  This unit uses a
brass flywheel on the engine to smooth out the power strokes.  If the
flywheel wasn't there, the engine would strip the teeth off the belt
the first time it was fired up.  This unit would probably cost $200 to
make if you had the drawings and knew a good machinest/toolmaker.
_________________________________________________________________
 Mike Walpole     |      This space       |      msw@meaddata.com
 Mead Data Central|     accidentally      |...!uunet!meaddata!msw
 Miamisburg, OH   |      left blank!      |
(513)865-1086     |                       |
From: trljim@ubvmsb.cc.buffalo.edu (JIM SONNENMEIER)
Newsgroups: rec.models.rc
Subject: Re: Flapping Wings
Date: 12 Dec 92 01:10:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41

In article <Bz4BMC.7u1@news.cso.uiuc.edu>, selig@uxh.cso.uiuc.edu (selig michael) writes...
> 
>I know a little about the onithopter efforts taking place at the
>University of Toronto.  Jim DeLaurier and Jerry Harris spent 20 years
>on the design of the world's first RC powered ornithopter.  Up until
>a year ago there only claim to fame was that they had a ornithpter
>that flew but did not sustain flight, i.e. climb.  (MaCready's pterodactyl
>did this too.)  I was contacted by Jim DeLaurier to design them a new
>airfoil specifically for the task of flapping.  With the new airfoil, this
>improved matters just enough so that it could climb.  Coverage of the
>flight made it on CNN just a little over a year ago.
> 
>
>Michael Selig

I forgot that you had told me that! .. I'm sorry Michael
I still owe you email ... hope you have a good holiday.


As with everyone else on rec.models.rc, one of my favorite groups on USENET
happy holidays!

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