HDTenEightyP/NetNews huggingface dataset:
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Newsgroups: rec.models.rc
Subject: Re: Puma engines?
Date: 18 Aug 92 15:31:41 GMT
Organization: Indiana University

In article <22918@hacgate.SCG.HAC.COM> lew@4ccvw25.UUCP (Lyman Lew) writes:
>In article <BsxHME.LoA@usenet.ucs.indiana.edu> ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:

>>perked my interest is that they have a 2.5cc (.15) CL Combat/
>>FF engine for $50. They also have a 2.5cc diesel for $30.00. 
>>My guess is that this is a european (Hungarian? Spanish?) out-
>>fit since the Japanese and Taiwanese wouldn't make competition
>>.15s....

>>If I were still flying FAI Combat I'd buy one...

>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-)


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...



-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
From: lew@4ccvw16.scg.hac.com (Lyman Lew)
Newsgroups: rec.models.rc
Subject: Re: Q500
Date: 14 Aug 92 00:42:20 GMT
Reply-To: lew@4ccvw16.UUCP (Lyman Lew)
Organization: Hughes Aircraft Co., El Segundo, CA

In article <9208121753.AA22580@top.magnus.acs.ohio-state.edu> mmarks@magnus.acs.ohio-state.edu (Matthew D Marks) writes:
>Hello Net-
>
>Can someone give me a quick discription of Quickie 500.  I have never seen it, 
>but from reading the mail it appears to be an inexpensive method of pylon 
>racing.
>
>Is the plane size limited?  What size engines?  I've seen the terms "Scat Cat"
>and Nelson Engines.  Any other popular kits or engines?
>
>How many laps do you race?  How big is a lap?
>
>-- 
>======================================================================
>Matthew D. Marks                   ||
>Graduate Research Associate        ||   " In the race for quality,
>Mechanical Engineering Department  ||     there is no finish line. "
>The Ohio State University          ||
>e-mail: marks.23@osu.edu           ||              - David T. Kearns
>======================================================================

OK here it is. Quickie 500 is also known as RC Sport Pylon as descibed in
my 1986-87 AMA Regulation Manual. I believe that Q500 falls under Class II
or III. The AMA regulations for the aircraft is as follow:

1. Engine limit for Class II and III is .40. The motor must be front
rotary induction, side exhaust, and a throttle that will permit it to
idle low enough that the airplane does not roll on grass.

2. Stock or commercial mufflers are required. Muffler pressure is allowed.
Tune pipes and pumps are not allowed.

3. The airplane must have a minimum of 500 sq. in. of wing area and a 
constant chord with a minimum thickness of 12% of the chord.

4. Fuselage is box type with minimum corner radiuses of 1/4 in.

5. Landing gear must be fixed with a minimum of two wheels.

6. Airplane weight not to exceed 10 pounds but 4-5 pounds is the norm.


The flying course can be the course used by Formula I or Quarter Midget.
Both courses have three pylons labeled 1,2, and 3. Pylon 2 and 3 are spaced
100 ft apart and pylon 1 is located 608 ft away from 2 and 3 for Formula 1
and 475 ft for Quarter Midget. Minimum race lap distance is 1055 ft for 
Quarter Midget and 1320 ft for Formula I. I believe the race is for seven
laps. Some of speeds I've heard ranges in the 150 to 170mph. I believe
Formula I is in the 190 range. Someone ought to calculate the kinetic
energy of one these birds and compare it to any ordinance or small round
munitions. I think a surprise is in store!

Hope this helps.

Lyman Lew, lew@caesi.scg.hsc.com



Newsgroups: rec.models.rc
From: mark@ssd.intel.com (Mark Rogers)
Subject: 1/10th Scale Off-Road Nats.
Organization: Supercomputer Systems Divison, Intel Corp.
Date: Tue, 18 Aug 1992 21:22:21 GMT

OK.  Here is what I have heard so far:

Rick Vehlow won 2WD Stock with a Traxxas.
Brian Kinwald won 2WD Modified with an RC10 Team Car.
JD Beckwith won 4WD Modified.  Not sure what car he drove.

Apparently there were numerous problems with the AMB Lap counting equipment.  The
alleged rumor was that Novak had cranked up the freq's on the Team Rooties speed-
controllers and that this had somehow messed up the lap counting.  They had to 
wait for another lap counter machine and transponders.  I am not sure I can
believe this or not.

A friend of mine who raced in the Nats said that I didn't miss anything by not
attending.

-- 


Mark Rogers

mark@ssd.intel.com
1-800-421-2823
FAX: (503)629-9147
From: paulm@paulsun (Paul Moreau)
Newsgroups: rec.models.rc
Subject: Re: Under powered plane--need help!
Date: 11 Aug 92 14:18:08 GMT
Organization: storcon


  Sig Cougars fly very well (HOT) over powered but are deffinitely not for
  beginners....

  YS .45 can be had for a very good price from Tower and I believe that with
  A tuned pipe, you can't do better than this for power and price.   But with
  all the tail wait you have to play with, you could probably put a K&B .61 in
  the nose for the same price.   The K&B .61 will put out more torque than the
  YS and may not go as fast but will still be a kick in the pants.   A friend
  of mine had a Cougar with a YS .45 and pipe that was set up slightly tail
  heavy and would do some things you would not belive.   It would accelerate
  going straight up, do some snaps and cart wheels so fast you couldn't count
  them..

-- 
          _____________________________________________________________
          -                *                      _______   _~;       -
          -            Paul Moreau               |       =_= /        -
          -    Sr. Diagnostics Software Eng.     \   USA    /         -
          -        Anaheim, California      --->  *-_  ___ /          -
          -     UUCP: ..!ccicpg!dorjam!paulm         \/   \\          -
          _____________________________________________________________
Newsgroups: rec.models.rc
From: jam@ee.uwm.edu (Jeff McKelvey)
Subject: Responses from Engine troubles
Organization: University of Wisconsin, Milwaukee
Date: Sat, 15 Aug 1992 04:44:59 GMT


I recently posted a question about a problem I had with an OS SF .25.
It would run fine on the ground but after 3-5 mins in the air it would
suffer a severe loss of power and RPM.  Here is a brief list of the
possible solutions I recieved:

1) By far the most often recieved response was that there is a hole
   or leak somewhere in the fuel pickup letting in air causing the
   mixture to be too lean.  I took the fuel system apart, put it in
   a tub of water and blew air into it looking for leaks but found
   none.  I ran the engine on the ground and saw no air bubbles in
   the fuel line.  I even shook the plane more than it would be in the
   air but still no bubbles.  This was not the problem.

2) Another suggested I might have a leak in the air pressure line/tap
   from the muffler.  This was not the case either.

3) Along the same lines, one person suggested that some of the bolts on
   the engine might be loose letting in air.  They were so tight I could
   barely get them loose at all.

4) It was also suggested to try a smaller prop and/or a lower nitro fuel.
   Since I am using both the prop and type of fuel recommended by the
   manufacturer ( 9X6 and 10% nitro ) I feel it should be capable of
   working under these conditions.

5) Finally, I got a response from someone who had a similar problem with an
   OS engine.  He made adjustments to the mixture control scew and
   needle valve simultaneously until the engine ran properly.  I looked at
   the instruction manual for the carb. and it stated that in case the
   original setting of the mixture screw is moved, re-adjust by turning 
   it in all the way and then 1 1/2 turns back out, make final tweaking 
   from that point.  As it turns out this screw was in too far (only about 
   1 turn from the closed position), causing a lean mixture I suppose.
   
After doing the above, a couple of more questions have come up.  First of
all, what is 2 cylcing and 4 cycling?  I didn't realize a 2 cycle engine
was capable of 4 cycling.  How do you tell the difference?  Also, I
noticed that the engine reaches peak RPM when the needle valve is about
6 turns out, from the responses I've been getting and from the manual
this seems like a lot, is it?  Should it be closer to 2 or 3?
It's been raining here all week so I don't know how the engine works in
the air yet but, as usual, runs great in my parking lot.

Thanks again,
Jeff


Newsgroups: rec.models.rc
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Subject: Re: Responses from Engine troubles
Organization: Indiana University
Date: Tue, 18 Aug 1992 15:42:10 GMT

In article <1992Aug18.030343.20950@c3177208.ssr.hp.com> bill@c3177208.ssr.hp.com (Bill Chidester) writes:

>   You still have a whopper of an air leak and I'll bet I know where it is.
>   Every O/S engine I have seen (well, every two-cycle engine) leaks around 
>   the needle valve.  Our standard fix is to put a short (1/4 to 3/8") section 
>   of medium or large fuel tubing over the needle valve, where the needle 
>   valve screws into the needle valve housing.

We've been doing this for years but for a different reason. If we 
don't do it the fuel leaks out! Doesn't make for good fuel mileage...

By the way... "we" are C/L Combat fliers and we use high pressure
bladder tanks with (usually) an OS .10 FSR nva as a remote needle.






-- 
-------------------------------------------------------------------------------
Iskandar Taib                          | The only thing worse than Peach ala
Internet: NTAIB@SILVER.UCS.INDIANA.EDU |    Frog is Frog ala Peach
Bitnet:   NTAIB@IUBACS                 !
Newsgroups: rec.models.rc
From: ntaib@silver.ucs.indiana.edu (Iskandar Taib)
Subject: Re: Foam Cores
Organization: Indiana University
Date: Sun, 23 Aug 1992 02:36:25 GMT

In article <1992Aug20.194631.18577@linus.mitre.org> mmcevill@mitre.org (Michael A. McEvilley) writes:
>In article <BtAEB2.7v5@usenet.ucs.indiana.edu> 
>ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
>> In article <1992Aug19.181318.29546@linus.mitre.org> mmcevill@mitre.org 
>(Michael A. McEvilley) writes:
>> >In article <1992Aug18.214800.1782@iex.uucp> djones@iex.iex.com writes:

>> How about arranging these cap strips so you have "geodesic 
>> ribs"? Once you cut out the foam in between it'll be far 
>> stiffer than if you use simply back-to-front capstrips.
>
>Geodesic what!?!?!?!  Had to look that one up (and who said RC was 
>non-educational)! 
>A diagram of what you are implying would still help.


Ummm... easy enough. Instead of having ribs at right angles to the 
spars you angle them at 60 degrees. Alternate ribs slant left and 
right, and meet behind the spar. (I assume you'd leave the wing in
front of the spar solid and just cut out the foam behind the spar). 
This way the rib bays are triangular.

Have a look at Norm McFadden's Creamsicles sometime. (Who? What?
Creamsicles?  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: ericw@hobbes.amd.com (Eric Wedaa)
Newsgroups: rec.models.rc
Subject: Re: Quickie 500 Needs to be REFORMED!!
Date: 12 Aug 92 19:58:07 GMT
Distribution: na
Organization: Advanced Micro Devices, Inc.

lew@4ccvt2.scg.hac.com (Lyman Lew) writes:

>1.
>2.
>3.
>4.

1-4 are NOT good ideas!

>5. Put fuel shutoffs of some kind on the engines should a wing 
>depart from the fuselage.

This should be easy enough to do.  (And is a good idea anyways...)
You could just some sort of cable leading from inside the wing
or some bolted on part of the wing, to the fuel line.  Then, if the 
wing pops off, either A) it pulls the fuel line from the engine/gas tank,
or B) (If your fuel line does not give) keeps the wing semi-attached
to the fueselage.

>6. Install a drag chute in the fuselage should the wing depart
>from the fuselage.

A little harder to do, but still within the realms of possibility.
glue a small cardboard tube (Toilet paper perhaps?) to the inside
of the fuselage.  "Z" fold the parachute into the tube.  Tie the 
anchor lines (correct name?) to the landing gear, and have an extra
cord attached to the parachute.  When you install the wind, loop 
the cord around a piece of tape, and attach the tape to the wind.
Then if the wind comes off, it yanks the parachute out. 

That's probably not a bad idea for a "beginners" plane anyways, 
as I've seen more of them lose wings than any other type.


>>>>Ericw

--
Eric Wedaa  -  eric.wedaa@amd.com | Two more kinds of lies...
{ames apple uunet}!amd!ericw      |     Release Dates, and Benchmarks
Advanced Micro Devices, M/S 167 PO Box 3453 Sunnyvale, CA 94088-3453
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Newsgroups: rec.models.rc
From: djones@iex.iex.com
Subject: Re: Quickie 500 Needs to be REFORMED!!
Organization: IEX Corporation Inc.
Date: Mon, 17 Aug 1992 22:38:08 GMT

In article <22808@hacgate.SCG.HAC.COM> lew@4ccvt2.scg.hac.com (Lyman Lew)
writes:
I am too in favor of some kind of control being placed on the Quickie 500
folks. It was always my impression that this class was an INTERMEDIATE class.
It is for those who aren't quite ready for Formula I or 1/4 scale midgets, but
had out grown Slow 500 racing. I agree with some of the other posters that most
of the Quickie 500 guys are a group of 'win at all costs' types....Type A
personalities!!! But that's ok, there is a place in our hobby for them. Just as
there is a place for the Sport/SUnday flyers and the Pattern jocks etc. In our
area (North Central Texas) Slow 500 racing seems to be the big stuff for the
Sport flyer who likes to go fast and turn left. This class is usually made up
of 4 Star 40's and K&B 40 engines. All stock. It looks like a lot of fun if
that is your thing.

Doug
-------------------------------------------------------------------
'I am a traveler of                |    Douglas R. Jones
     both Time and Space'          |    IEX Corporation
       Led Zeppelin                |    (214)612-2600 ext: 325
                                   |    djones@iex.iex.com
                                   |    uunet!iex!djones
-------------------------------------------------------------------
From: piper@bach.udel.edu (Jon Malenfant)
Newsgroups: rec.models.rc
Subject: Help on Shipping
Date: 18 Aug 92 02:07:55 GMT
Organization: University of Delaware


	Hello, I have found a buyer for my airplane and I am having trouble finding
	a box to ship it in.  It has to cross the country so it has to be pretty
	rugged.  Does anyone have any suggestions where I can get a box or a cheap
	method of contructing one to save on shipping costs.  It doesn't make sence
	to pay a large percentage of the packages worth just for shipping!

	Any help is greatly appreciated!!

-- 
*********************************************************************
*  Jon R. Malenfant     "Nothing in the world compares to flying!"  * 
*  piper@bach.udel.edu         piper@freezer.cns.udel.edu           *
*********************************************************************
Newsgroups: rec.models.rc
From: paulm@paulsun.UUCP (Paul Moreau)
Subject: Re: re:AM vs FM AGAIN? - Have Mercy
Keywords: Dual Conversion and AM 
Organization: Storage Concepts, Inc.
Date: Mon, 17 Aug 1992 14:13:24 GMT


In article <1992Aug15.042043.16031@nntpd.lkg.dec.com>, fisher@kay.enet.dec.com
|> 
|> No - AM by itself is not a problem.  The problem is you want a dual conversion
|> receiver.  The inexpensive Futaba AM systems are NOT dual conversion.
|> If you want a radio RIGHT AWAY - call Tower and get the Futaba FM (Conquest).
|> I know they are in stock because I ordered one this Tuesday.  But for
|> my purposes it is just a flight pack - I have no use for the transmitter.
|> It will cost you a bit more than the AM but it is a dual conversion receiver
|> and it will be safe against 2IM interference.
|> 
|> Of course if you really want a radio RIGHT AWAY - you should go to your
|> local hobby shop.  You'd be surprised - most shops now match Tower prices.
|> If they won't ask them to.  
|> 
|> Bye          --+--
|> Kay R. Fisher  |
|> ---------------O---------------
|> ################################################################################

   Dual conversion on an AM?   I thought that dual conversion was impossible/
   useless on an AM receiver because of the method of detecting an AM signal.
   Besides,   I've yet to see an AM receiver that had 'Dual Conversion' on it.

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

Newsgroups: rec.models.rc
From: nm@ssd.intel.com (Nicholas Mati)
Subject: Re: ESCs - brake transistors - why?
Organization: Supercomputer Systems Division, Intel Corp.
Date: Thu, 20 Aug 1992 17:14:10 GMT

In article <1992Aug20.162518.23039@magnus.acs.ohio-state.edu> sbbrown@magnus.acs.ohio-state.edu (Stephen B. Brown) writes:

deleted
>
>      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.

There is some inductance associated with the armature windings of a 
DC motor.  However the amount of energy stored in this inductance
is small compared with the armature's angular rotational energy and 
the kinetic energy of the vehicle.

A model for this system would be a relatively small inductance inseries
with an ideal motor/generator.  If power is being supplied to the motor
/generator and the source is suddenly disrupted, there would be a short
term transient where the voltage across the inductor would increase to 
a vary large value (normally held in check by the fly back catch diode 
in many motor speed controllers) "as the inductor attempts to keep current
flowing through it" (I hate personifications).  On a longer time scale once 
the inductor current reaches steady state, we're basically dealing with a 
generator that can convert vehicle motion or rotational energy to electrical
energy.  In an ESC with a brake, this motor/generator output is short
circuited by a braking FET causing the electrical energy to be dissipated 
by the FET and the internal winding resistance of the motor/generator.  Note
that the current through the braking FET is opposite the current that flows
through the catch diode.

-Nick Mati

---------------------------------------------------------------------------
Opinions Expressed.......etc.etc.
From: borodin@hope.llumc.edu (Sergi Borodin)
Newsgroups: rec.models.rc
Subject: RE:ESCs - brake transistors - why?
Date: 21 Aug 92 01:39:10 GMT
Organization: LLUMC Radiation Research Lab



kaiser@elec.canterbury.ac.nz (Chris Kaiser) writes:

>>In article <1992Aug19.213712.25560@proton.llumc.edu>, borodin@hope.llumc.edu (Sergi Borodin) writes:

>>  To turn the motor in one direction we close (let's say) A & D, in 
>>  opposite - B & C.  
>
>So far so good...

  I appreciate your appreciation.

>
>>  Obviously, in order to brake we would need to close either A & B or
>>  C & D.
>
>The problem with this is that when braking one of the transistors will be 
>reverse
>biased, i.e. you're trying to force current through it in the wrong direction.
>e.g. 

  In fact, it is not a problem here. All power MOSFETs have an intrinsic 
  rectifier, or body diode, a junction rectifier whose current rating is
  the same as that of transistor. Since the direction of the diode is the
  opposite (e.g. cathode of the diode is connected to the drain and the
  anode - to the source) as that of transistor, it is IMPOSSIBLE to 
  reverse bias it. Besides, if those diodes would not exist we should invent
  them anyway.

>>I don't think the reverse biasing will do them much good...

  See above.

>>  For instance, it could be bad (I don't know) to apply
>>  full brakes and a small resistor (to acheive lighter braking) might
>>  be desirable.
>
>This would also be a reason - for speed control the transistors would be
>pulsed between full on and full off. When braking however, you want the
>current to be continous but variable - varying the brake current of load
>varies the amount of braking effect.

  How can one vary the braking current if there is a constant resistor?
  In other words, you can't adjust the braking effect.
 
>Do you know the on-resistance of these MOSFET's? Motorola MTP50N05's and
>IRFZ 40's (both cheap and readily available) are about 0.028 ohms,

 The transistors I'm talking about are IRFZ40.

> In fact most aircraft
>speed controls use up to 6 (or more) of these (or similar)  MOSFET's in 
>parallel!

  It leads us up to 30 MOSFETS in total, doesn't it? Hard to beleive.
  I read in RCM that (well, I didn't touch an ESC, though) there are
  mostly like a couple of transistors in parallel.
  
  S.B.
From: rray@lookout.it.uswc.uswest.com (Randy J. Ray)
Newsgroups: rec.models.rc,rec.models.rockets,alt.models,rec.models.railroad,news.groups
Subject: Re: RFD: rec.models.scale
Date: 14 Aug 92 17:55:48 GMT
Organization: US WEST Communications, Inc. -- Denver, CO

In article <BszArB.3u2@usenet.ucs.indiana.edu>, ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
> OK people...
> 
> 
> Is this thread dead or are we going to have a call for votes????? 
> 
> Lets get this going before the Scale World Champs at the end of this 
> month!!!!
> 

According to the guidelines of news.announce.newsgroups, the Call For Votes
cannot begin before the 19th of August, despite the fact that discussion is
essentially over. Had the first discussion call I posted actually gone through,
instead of just disappearing into the void, I would have put up the CFV this
week. As it is, I must wait until the 19th.

Randy
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Randy J. Ray -- U S WEST IT/CSD         rray@{lookout,uswat}.it.uswc.uswest.com
I'd rather talk religion with Charles Manson than discuss ethics with Congress.
     -me                                                   Phone: (303)595-2852
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Newsgroups: rec.models.rc