HDTenEightyP/NetNews huggingface dataset:
From: paulm@storcon (Paul Moreau)
Subject: Re: Tuned Pipe Questions
Organization: Storage Concepts, Inc.
Date: Fri, 21 Aug 1992 14:02:53 GMT


In article <1992Aug20.131653.3656@linus.mitre.org>, mmcevill@mitre.org (Michael A. McEvilley) writes:
|> In article <Bt8q1t.EpJ@world.std.com> jlw@world.std.com (James L Walker) 
|> writes:
|> > I run my Enya .45 CX with a 10x7.  As I understand it this slows the 
|> engine
|> > down and reduces prop noise.  At my field we are pretty paranoid about 
|> > sound, so I would always raise the pitch before the length of the prop.
|> 
|> Either increasing prop diameter while keeping prop pitch constant, or, increasing prop pitch while keeping prop diameter constant increases the loading on the engine and will result in less peak RPM, which translates into slower propellar tip speed which |> is where a lot of the noise comes from.  So it is not necessary to 'always'increase the pitch before the length to get 
|> lower peak RPM.
|> 
|> BTW, if you are really interested in minimum noise, try soft-mounting your 
|> engine as well.  It works!    
|> 
|> BTW-FYI, once an optimum peak RPM/pipe length has been established, as peak RPM increases, pipe length must decrease and vice versa.  When measuring pipe length, measure along the header center-line, not a Point A - Point B straight  line type measurement|> .
|> 
|> Michael

   But...
    In increasing the prop length, you also increase the prop tip speed.
    So in increasing the length only to slow the engine down could result
    in maintaining the prop tip speed.    I usually increase the pitch while
    maintaining the length to drop tip speed.

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

From: earl@trsvax.tandy.com
Date: 21 Aug 92 09:55 CDT
Newsgroups: rec.models.rc
Subject: Re: Futaba speed control with Airtronic
Message-ID: <1195667301@trsvax>
Nf-ID: #R:vincent1.iastate.edu:714025963:trsvax:1195667301:000:2839
Nf-From: trsvax.tandy.com!earl    Aug 21 09:55:00 1992



/* ---------- "Futaba speed control with Airtronic" ---------- */
Ok, I know that Airtronics receiver can be used with a Futaba servo,
does anyone see any problem using a Futaba Electronic speed control with
an airtronics reciever?  I really dont want to blow up the speed
control, but Airtronics want >$100 for thiers and I already have a
Futaba in an R/C car, soooooo I want to use that.  
I'm going to put it in a Great Planes PT-Electric.  I really dont like
the cheesy little microswitch pushed by a servo arrangment they want to
use.
*************************************************

   It'll work without too much of any problems.

   1.  If possible, adjust the ESC so that you do not have reverse, if your
      ESC supports reverse. You definitely do not want to reverse the motor
      in flight.

   2.  Don't use the ESC's BEC circuit for powering the receiver and servos.
      CAR ESC's do not have a low voltage cutoff, they'll run all the way down
      until the battery is dead. This is OK in a car, but will be desasterous
      in a aiplane. Pull the red pin (power) from the signal (throttle)
      connector on the ESC and wrap it up with tape to prevent shorts. Then
      only the signal and ground wires will be used. Use a separate battery
      pack to power the radio system, You can either make up a 250mah pack
      or buy one readymade. Either way it works good, as you can fly 5 or
      six flights off of the 225-270mah packs with 2 servos anyway.


   3. Airtronics and Futaba have different connectors, and the power and ground
     wires are reversed. Merely cutoff the small tab on the side of the Futaba
     connector with a X-Acto knife and you'll be able to plug it into the
     Aitronics receiver easily enough. Now you need to ensure that the
     wires are hooked up correctly.
	 
	           FUTABA                   AIRTRONICS
      Pin 1     White Signal              BLACK  SIGNAL
      Pin 2	Red   Power               BLACK  Ground
      Pin 3	Black Ground              BLACK/RED  Power

     If your careful, you can unplug the red wire, and move the black wire
     to the middle pin, and by carefully observing polarity plug the Futaba
     connector into the Airtronics reveiver without trouble. Then use the
     ESC control's adjustments, and your in business.



***********************************************************************


<This information is provided by an individual and is not nor should be
 construed  as  being  provided  by  Radio  Shack or Tandy Corp.  Radio
 Shack/Tandy Corp has no obligation to support the information provided
 in  any way. > 
						
						Earl W. Bollinger
						@ <trsvax!earl>


"You were in the Clone Wars!", said Luke excitedly.
"Yes", replied Obi Wan, "I was a DOS programmer. But that was before the dark
 times, before OS2."


Newsgroups: rec.models.rc
From: hutto@SMTC.engr.scarolina.edu (Brent Hutto)
Subject: Re: Hamliton Hobbies Phone number
Reply-To: hutto@smtc.engr.scarolina.edu
Organization: NIST Southeast Manufacturing Technology Center
Date: Thu, 20 Aug 92 17:54:25 GMT

In article <1992Aug18.181824.24046@cbfsb.cb.att.com>, soccer@cbnewsf.cb.att.com (clyde.a.hollister) writes:
>
>Looking for the phone number of Hamilton Hobbies.

    Sorry to say, Mr. Hamilton has shut down his Hamilton Hobbies 
    business.  He had a full-time "day job" and the hobby shop got
    to be too big a load to handle in addition.  'Tis a pity, too.
    He had a fine business going, I liked dealing with him.

-------------------------------
Brent Hutto
hutto@SMTC.engr.scarolina.edu
From: m14494@mwvm.mitre.org (Mike White)
Newsgroups: rec.models.rc
Subject: Question about Diesels
Date: 17 Aug 92 18:59:38 GMT
Distribution: na
Organization: The MITRE Corporation

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.

(signed)
Reeling from RC culture shock

************************
* These are my opinions only.*
************************
Newsgroups: rec.models.rc
From: js79408@cs.tut.fi (Sassi Jari (OH1CN/3MWW))
Subject: Anybody with experience in Dave Smith's kits?
Originator: js79408@kaarne.cs.tut.fi
Organization: Tampere University of Technology
Distribution: eunet
Date: Wed, 19 Aug 1992 07:00:12 GMT

Does anyone have experience in Dave Smith's airplane kits.  I am about to buy
an airplane for F3A competition and Dave Smith has DSM Saphir kit in reasonable
price.  I would like to know how complete are DSM series and what is the 
quality of those kits?

The other alternative is Graphik 60 advertised by Radio Active. It is more
expensive but perhaps it is better plane or kit?

I would be pleased to get information and opinion of those (and also other)
series.

I would also like to get addresses and Fax numbers for adventageous RC-stores 
in Germany, England or other european country.  

My e-mail address is js79408@ee.tut.fi

Thanks for Your help.

-- 
Jari Sassi                           OH1CN/OH3MWW
Opiskelijankatu 4B91                 email: js79408@cs.tut.fi
SF-33720 TAMPERE                     packet radio OH3MWW@OH3RBR.#TRE.FIN.EU
+358-(9)31-182281
--
From: guyer@aludra.usc.edu (David Guyer)
Newsgroups: rec.models.rc
Subject: Re: SAE Contest in MODEL AVIATION
Date: 17 Aug 1992 10:29:58 -0700
Organization: University of Southern California, Los Angeles, CA
Distribution: na
NNTP-Posting-Host: aludra.usc.edu

In article <Bsw1MH.6tM@usenet.ucs.indiana.edu> ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
>
>I think Embry-Riddle took first or second. They had some experienced
>modellers on their team including Todd Lee, an up-and-coming C/L Stunt
>flier. They covered this in Model Aviation some months ago.
>

Actually the top 4 finishers were: (I can get a total list if anyone is
                                    interested)

University of British Columbia      18 lbs.
University of Southern California   15 3/4 lbs.
Iowa State University ???           16 lbs.
Ohio State University               15 lbs. ??

The reason USC finished above ISU is that the total weight is not the only 
part of the competition, even though it is the major part.

                          David Guyer  guyer@spock.usc.edu


Newsgroups: rec.models.rc
From: svoboda@rtsg.mot.com (David Svoboda)
Subject: Re: Switching to Ailerons -- How easy?
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Wed, 19 Aug 1992 20:05:41 GMT

In article <1992Aug17.205424.27800@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!

Wisdom?  Let's just call it "advice", okay?  :-)

1. Ailerons are more "immediate" than rudder, so you do not have to
"lead" the airplane around so much.  If you don't know that you are
doing this, then the ailerons will seem rather sensitive at first.
Be sure to use little enough throw on the ailerons that the roll
rate is similar to what you are used to.  There's nothing wrong
with finding an experienced modeller to help you trim it out.  (I
was on my third airplane before I ever made a maiden flight.)

2. The ailerons may not be effective at very low airspeeds.  You
need to be able to use the rudder, as well.  If you winch your
sailplane, you should use rudder on the winch to steer, and ailerons
to keep the wings level.  Also, it is sometimes helpful to coordinate
rudder with aileron for tight turns (a computer radio can mix this
for you.)

3. A heavier bird with a more advanced airfoil will have a much
higher top speed.  If you put the nose down, the sailplane can
easily gain enough speed to damage it (flutter, overstress when
you pull out, etc), so be aware of your flying speed at all times.
OTOH, it's fun to go fast.  :-)

4. A heavier sailplane can cause more damage (to itself, and other
property/people) in a crash.  Be careful out there.

		Dave Svoboda

PS, the one fatal mistake that many people make on their first aileron
ship is having reversed ailerons.  Stick right==right aileron *up*.
Newsgroups: rec.models.rc
Subject: Re: Sophisticated Lady 
From: kaiser@elec.canterbury.ac.nz (Chris Kaiser)
Date: 19 Aug 92 11:36:42 +1200
 <22918@hacgate.SCG.HAC.COM> <Bt6r4t.Dn6@usenet.ucs.indiana.edu> <1992Aug18.161753.16342@inesc.pt>
Distribution: world
Organization: Electrical Engineering, University of Canterbury, New Zealand

In article <1992Aug18.161753.16342@inesc.pt>, usenet@inesc.pt (USENET News System) writes:
> 	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.

I've built an Electra, which I believe has the same wing as the SL. This has a main spar
of about 1/2" by 1/4" on the bottom of the wing, and the leading edge is sheeted with 1/16"
on the top only - there is no spar or webbing supporting the rear of the LE sheeting.
You can add a lot of strength for very little weight by adding a web between the main spar
and the LE sheeting on the wing center section - use 1/16" balsa with the grain vertical and
glue it on top of the main spar and under the rear of the LE sheeting (i.e. before you add
the LE sheeting). This will stop the LE sheeting buckling under launching loads - I've seen
one of these wings without the webbing being launched, it looked like it had an extra dihedral
joint half way out the centre sections! I've tried to show this mod. with a cross section of
part of the wing below...


LE sheeting --> ============------
                           | <-- vertical grain balsa web
                          _|_
                          | |
            Main spar --> | | 
           _______________|_|_____ 


Another weak point on the Electra that may also apply to the SL is the rear fuselage. This
is 1/16" sheet with the grain lengthwise on both sides plus top and bottom, and leads to a
weak tail - the tail surfaces can be wobbled quite easily. Changing the top and bottom
sheeting to cross-grain (i.e. the wood grain running across the fuse rather than lengthwise)
greatly strengthens the tail without adding any extra weight (since you use the same thickness
balsa. Even changing only one of the top or bottom to cross-grain sheeting adds a lot rigidity
to the tail, and is well worth the effort. Even if the SL uses thicker balsa (e.g. 3/32") you
will still gain significant rigidity and strength from cross-grain rather than lengthwise
sheeting.

Chris Kaiser

Postgrad, Elec. Eng. Dept.
University of Canterbury
Christchurch, NEW ZEALAND
From: tod@cs.washington.edu (Tod Amon)
Newsgroups: rec.models.rc
Subject: Switching to Ailerons -- How easy?
Date: 17 Aug 92 20:54:24 GMT
Organization: Computer Science & Engineering, U. of Washington, Seattle

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
From: jrp@bohra.cpg.oz.au (John Pitman)
Newsgroups: rec.models.rc
Subject: trouble with os 25 lean
Date: 18 Aug 92 03:59:35 GMT
Organization: Computer Power Software

Hi there
If it needs to be out 6 (SIX!) turns to peak there is definitely something
wrong! Most OS engines run well between 1 1/4 to 2 turns. My 46SF and an
old 60 blackhead run on pipe at 1 1/2 to 1 5/8 out. It should go from fine
2 stroke (ie a clean smooth high pitch note) to slobbering rich 4 stroke
(ie somewhat uneven much lower pitch note) within 1/2 turn out. It it will
still run at 6 turns out, there is something other than the needle controlling
the fuel supply. try removing the needle, and blow through the pressure line
- you should get a flood of fuel out the needle hole. if ok, remove the needle
threaded adaptor and inspect for rubbish under it. also check that if you remove
the idle needle from the other side, the jet tube is clear right through. you
would be surprised at the rubbish i have seen here - bits of silicon, hair, lint
etc! You should not have to blow very hard to push fuel through the tubing
from the tank - if you do, investigate. also check that the O ring on the needle
is in good condition - no nicks, cuts etc to leak air.
jp
Newsgroups: rec.models.rockets
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Subject: Re: Estes composites (was Where did my rocket go??)
Organization: Indiana University
Date: Thu, 20 Aug 1992 15:05:32 GMT

In article <5702@transfer.stratus.com> cdt@sw.stratus.com (C. D. Tavares) writes:
>In article <Bt8x8M.G9v@usenet.ucs.indiana.edu>, ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:

>> There isn't a Russian equivalent of Estes is there? 

>There is NO other equivalent to Estes!  But no, not the way you mean.

>> Do the competitors build their own motors?

>If they do, they are violating the rules.  I suspect many countries
>just have "small-volume professional" manufacturers like Vulcan.

I find this an interesting thread because in the other aviation
modelsports the Eastern Europeans (and the Chinese!) depend on 
hand-bulit rather than mass produced items. Their control-line 
combat and aerobatics motors are built either by the competitors 
or by small production shops associated with modellers or groups 
of modellers. Oftentimes they use machine shops at their place of 
work. I suspect that the same might be true for rocket motors..
its kind of hard to differentiate home built and factory built 
motors when the modellers (or their clubs) own the factory and 
man the machines!

Incidentally, since about two years ago, Russian (and other ex-
Soviet) equipment has been showing up in the States. They range 
from powerful, lightweight jewels (the Stels 2.5cc motor for 
instance) to garbage (someone did an engine review on a factory 
built Russian 5 cc sport diesel that was so incerdibly bad..)
but almost anything they use can now be had for a moderately 
steep price....

I imagine it would be different for rocket motors. There would 
be DOT to contend with for one  9-)





-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
From: jack@rml.UUCP (jack hagerty)
Newsgroups: rec.models.rockets
Subject: Re: Scale Model Rocketry, Peter Alway (was: New AmSpam Editor?)
Date: 20 Aug 92 22:26:51 GMT
Reply-To: jack@rml.UUCP (jack hagerty)
Organization: Robotic Midwives, Ltd.

In article <1992Aug20.145151.1557@murdoch.acc.Virginia.EDU> rbs@cyclops.micr.Virginia.EDU (Robert B. Sisk) writes:

>Completion depends upon his employment status.  At the moment he is out 
>of work so he spends his time on the book.  If he gets a job the book 
>may take another year or two.

>Good luck Peter!  May you finish the book and get a job.

In that order! :-)

- Jack


=============================================================================
||Jack Hagerty, Robotic Midwives, Ltd.                 jack@rml.com        ||
||Livermore, CA		           NOTE! New, improved address! ^^^        ||
||(510) 455-1143	            (old ones will still work)             ||
||-------------------------------------------------------------------------||
||               "Do or not do. There is no try." - Yoda                   ||
=============================================================================
From: msjohnso@daisy.WichitaKS.NCR.COM (Mark Johnson)
Newsgroups: rec.models.rockets
Subject: Re: Next NARAM (1993)
Date: 14 Aug 92 12:37:12 GMT
Reply-To: msjohnso@daisy.WichitaKS.NCR.COM (Mark Johnson)
Organization: NCR Corporation, Wichita KS

In article <1992Aug10.202149.1178@intelhf.hf.intel.com> george@hfglobe.intel.com (George Rachor) writes:
>Has the location been announced yet?

Not officially...at least not at NARAM-34. Rumor on the street is that it
will be in the Washington, DC area (held by the NARHAMS section), and that
HPR may not be included.  The National Sport Launch will be in February
1993 at Phoenix.

[CD, if you care to comment/debunk any of this, please feel free. I'm known
for being full of it anyway]
-- 
Mark Johnson                          USnail: NCR Peripheral Products Division
E-mail:  Mark.Johnson@WichitaKS.NCR.COM       3718 N. Rock Rd.
Voice: (316) 636-8189 [V+ 654-8189]           Wichita, KS  67226
[Non-business email: 76670.1775@compuserve.com]
From: cdt@sw.stratus.com (C. D. Tavares)
Newsgroups: rec.models.rockets
Subject: Re: Tripoli DOT/Reload Legal Fund
Date: 19 Aug 92 17:03:00 GMT
Organization: Stratus Computer, Inc.

In article <1992Aug18.203953.11479@rsd0.rsd.dl.nec.com>, buzz@rsd.dl.nec.com (Buzz McDermott) writes:
> Being that *funds are needed immediately*, NOW IS THE TIME to step forward and
> be counted amongst the supporters of reloadable technology before self-serving 
> individuals working in concert with the DOT place severe regulatory constraints
> upon it.

One note:  It is KNOWN that DOT lurkers are reading messages on CompuServe
MODELNET as part of their current investigation.  Given that they are willing
to PAY to get dirt on CIS, it behooves us to assume that they are also reading 
rec.models.rockets. which is free.  Keep this in mind as you post.
-- 

cdt@pdp.sw.stratus.com      --If you believe that I speak for my company,
OR cdt@vos.stratus.com        write today for my special Investors' Packet...
From: rbs@cyclops.micr.Virginia.EDU (Robert B. Sisk)
Newsgroups: rec.models.rockets
Subject: Re: HPR thoughts & questions...
Date: 21 Aug 92 15:47:49 GMT
Distribution: usa
Organization: University of Virginia

In article <1187@taniwha.UUCP> paul@taniwha.UUCP (Paul Campbell) writes:
>
>STUFF DELETED
>
>I did forget to mention that the G300 is a plugged motor - it has NO delay
>train/ejection charge - you have to provide your own recovery system such
>as timed thermalite.
>

I have seen a G300 launch a small rocket (about 3" by say 3') that
also had two E's air started.  The liftoff was very impressive.  We
were about 100 yards from the rocket.  We saw a flash (not a flash bulb
igniter, motor burn time about 0.5 seconds), the rocket was above the
launch rod when we heard the sound, it coasted up (no sound), then the
E's ignited!  Nice flight!  The only problem is that G300's cost
about $30.00.  A bit steep for a G.

Bob
-- 
---------------------------------------------------------------------------
Robert B. Sisk  PhD			Internet: rbs@virginia.edu
NAR #53448				UUCP:     uunet!virginia!rbs
TRIPOLI #1583                           CIS:      71501.1651@CompuServe.COM
Newsgroups: rec.models.rockets
From: pfeiffer@nmsu.edu (Joe Pfeiffer)
Subject: Re: What do I need to get something into orbit?
Organization: NMSU Computer Science
	<1992Aug12.161340.4896@ultb.isc.rit.edu>
Distribution: usa
Date: Thu, 13 Aug 1992 20:13:48 GMT

In article <1992Aug12.161340.4896@ultb.isc.rit.edu> jsvrc@rc.rit.edu (J A Stephen Viggiano) writes:


   You _can't_ put a model rocket (see the current definitions) into orbit, at
   least not if you launch it from ground level. I guess you could do what Jay
   Apt did, and take one aboard a Shuttle flight, but I don't think this is what
   you have in mind . . . . :-)

I never heard about this -- what happened here?

-Joe.
Newsgroups: rec.models.rockets
From: reynolds@panix.com (Brian Reynolds)
Subject: Re: Looking for information on OSC/Pegasus
Date: Wed, 12 Aug 1992 02:37:27 GMT
Organization: PANIX Public Access Unix, NYC

In article <1992Aug8.164031.18834@panix.com> reynolds@panix.com (Brian
Reynolds) writes:
>I would like to build a model of the OSC/Pegasus, but I have no scale
>information.  

Either I lead a charmed life, or I'm getting uncannily good at
predicting the editorial content of American Space Modeling.  :) The
latest issue has an article on Pegasus with some dimensions (enough to
make some eyeball measurements and size up a sport scale model), and a
couple of good B/W photos.  The article mentions NASA Ames-Dryden
Flight Research Facility (where the flights originate from), and
Oribital Sciences Corp., and Hercules Aerospace as major developers.
The article also mentions that the parent company of AeroTech is
involved in Pegasus.  I guess now I'll make a call to Aerotech to get
more information on how to contact the other companies for
information.

-- 
Brian Reynolds
reynolds@panix.com
NAR# 54438
IPMS# 30162
Newsgroups: rec.models.rockets