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Conference vmszoo::rc

Title:Welcome To The Radio Control Conference
Notice:dir's in 11, who's who in 4, sales in 6, auctions 19
Moderator:VMSSG::FRIEDRICHS
Created:Tue Jan 13 1987
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1706
Total number of notes:27193

1235.0. "ROBBE ASW 24 experience" by KBOMFG::KNOERLE () Thu Aug 02 1990 08:25

	Specification ASW 24 from ROBBE :

	Wingspan :    350 cm  (138 inch)
	Wingarea :    62.8 dm^2 (973 inch^2)
	Elevator :    6.5 dm^2  (100 inch^2)
	Profile :     HQ 3.0/13-10-13
	Fuselage :    PLURA (like ABS a sort of plastic)
	Lenght :      154 cm (60.6 inch)
	Weight :      3150 g (112.5 ounce)
	Wingloading : 50g/dm^2 (16.6 ounce/feet^2)
	
	Funktions : ailerons, elevator, rudder, spoilers and "Schleppkupplung"
		    (engl. ???)

	I purchased this kit from ROBBE by a local hobby shop, who currently
	has a discount prize on this model. The retail prize is DM 440.- 
	($ 259.-), I had to pay DM 330.- ($ 194.-).

	BUILDING

	The assembly of the fuselage was done fairly quick since all parts
	are precut and fit nice. The only parts of the fuselage I modified 
	were the pushrods. The ones supplied with the kit weren't stiff
	enough. The most tricky part of the fuselage assembly was the pilot
	that had to be painted. I'm not exactly a guy of the fine art, but
	it came out pretty much realistic to my own surprise. I soldered
	some sunglasses and glued some blue plastic to it so everyone looks
	at the glasses and doesn't look at the rest !
	The elevator is made from solid balsa just some grinding necessary.
	The rudder is built up, left side one balsa panel, right side one 
	balsa panel, and in between 4 ribbs, a 30 minutes job (max).

	The most time I had to spend on the wings. First the leading edge 
	had to be 'poxid to the wings. The very first impression was 'whow,
	the leading edge is shaped to form !' was quickly damped by 'sh*t,
	it doesn't fit !'. 
	Because the wing is trapezoid on the leadding edge, too, it had to be 
	two parts. Since I'm not that experienced laminar-profile grinder I 
	was (and still am) really afraid of getting the right shape to
	the leading edge, supported by Reinhard's (flying buddy) "Oh oh oh..."
	The wingtips are made from solid balsa, no problem. The ailerons
	were precut and needed just some balsa poxid to it. The spoilers
	were not that easy to install, the slot was not wide enough precut.

	The radio installation was a joke because all slots were factory
	cut and fit the standard size servos, a total installation time
	maybe one hour. The servos for the ailerons took a little longer
	because they are installed in the wings. Unfortunately the covers
	for the cutout of aileron servos didn't fit, I had to spend more time 
	of getting the covers correct in place and fit.

	The correct CG was adjusted with approx 300 g (11 ounces) of lead in 
	the nose. 

	FLYING

	My first flying experience were 4 handlaunches from a little hill
	maybe 60 feet high, no wind (almost). I needed just a little high trim
	to get it flying straight. A little thermal in 50 feet altitude lifted
	the ship several meters (maybe 3-4). 
	The next starts were with a winch, I was exited how it would work
	out since I never started with a winch. The line length was around
	250 m (819.672 feet). Reinhard hold the ship in his hand, the tow
	in the first hook, and I stepped on the knob of the winch. 
	Before releasing the plane he waited for the winch to slow down 
	(enough tension) and there it went straight upward, some correction 
	with rudder because the wind was not from straight forward. After the 
	plane was off the tow I could check the CG, what must have been a 
	little too far forward and the ailerons needed some left trim. From
	the estimated hight of 150 m (491.8 feet) I got a 4, a 5 and two 6 
	minutes flights, just little thermal activity (time between 6 and 7 PM)
	
	Maybe someone can tell me if thees times are : forget it, okay, good
	or excellent ?   

	One almost "Uuuuaaaaahhh" I have to tell you :  The 5th launch Reinhard
	told me: "Now since you're grown-up try everything by yourself !"
	My "I'm not so shure" was washed out by his "don't be girlish". Okay,
	I'm a full grown-up man. My left hand on the rudder, my right hand 
	holding the plane and my right foot on the switch. The winch started, 
	slowed down and I released the plane. 
	Up it went with some correction. 'What the hell, why is the 
	winch not pulling anymore ?' I thought. Then I told Reinhard "S T E P
	on the winch !!!". Too late. The plane made a nice stall turn and down
	it went. I didn't get the tow from the hook - until the very last
	moment it popped off with a pretty good speed. Ufffff...
	While concentrating on the plane I didn't realize that I slipped off
	the switch...
	Concensus :  I'm going to build a start car where to put the plane
	on when I like to go flying by myself.  Any comments from you 
	experienced glider guiders ?


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                          \  \                / \_\
                           \  \              /LO |
		       .-^^^--------==========___/
		      <      \  \-'
		       '-___-'\  \            
			       \  \
                                \  \
                                 \  \          Holm- und Rippenbruch,
                                  \ \
                                   \\                          Bernd
T.RTitleUserPersonal
Name
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1235.1Keep the reports coming...KAY::FISHERStop and smell the balsa.Thu Aug 02 1990 13:2114
>	on when I like to go flying by myself.  Any comments from you 
>	experienced glider guiders ?

Sounds great.  Enjoyed your story.  Please keep us posted on your
gliding experiences and this ASW.

Nice price!  I had a bit of trouble parsing your accent but loved
trying.  Did you have any significant damage from the last winch attempt?
If so tell us how you repaired the plastic fuselage.

Bye          --+--
Kay R. Fisher  |
---------------O---------------
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1235.2What's a "start car"?HPSPWR::WALTERThu Aug 02 1990 18:2119
>	Concensus :  I'm going to build a start car where to put the plane
>	on when I like to go flying by myself.  Any comments from you 
>	experienced glider guiders ?

I'm not quite sure what you mean by this. Do you mean set the glider on a cart
with wheels, attach the tow hook, and let 'er rip? If so, that sounds far more
likely to create problems than a simple hand launch. 

Using a winch just takes a little practice, and you'd probably be better off
practicing on a smaller (cheaper) glider. Operating the winch while flying the
plane takes some coordination; it's a little like patting your head while 
rubbing your stomach (do they do that in Europe?). But I always find it more
exciting a launch method than a high start, especially when executing a zoom
at the top. And launching out of your hand allows you to "feel" the pressure
as you spool up the winch, so that when you release the plane it climbs at an
optimum rate. With the plane on a cart, I would worry about controlling it at
low speed.

Dave
1235.3Translation confusionKAY::FISHERStop and smell the balsa.Fri Aug 03 1990 09:3117
>>	Concensus :  I'm going to build a start car where to put the plane
>>	on when I like to go flying by myself.  Any comments from you 
>>	experienced glider guiders ?
>
>I'm not quite sure what you mean by this. Do you mean set the glider on a cart
>with wheels, attach the tow hook, and let 'er rip? If so, that sounds far more
>likely to create problems than a simple hand launch. 

Different minds work in different ways.  My interpretation of the above
was building a winch with a car starter?  But I only read it about 3 times.
I can see now where you are probably right and I agree - the launch dolly
will probably be more trouble than help.

Bye          --+--
Kay R. Fisher  |
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1235.4Hand held launches are safestELMAGO::TTOMBAUGHHigh Plains DrifterFri Aug 03 1990 09:4520
    I was confused by the *start cart too, but assumed it was a launch
    dolly. Anything that runs on the ground is going to cause more trouble
    than it's worth. Learn to hand launch, by practicing conservative
    launches with the winch. Keep the nose down a little and don't
    try for max. altitude on every launch. You'll be an accomplished
    winch user in short order.
    
    The British use an interesting system for launching their sailplanes
    with an aerotow. The plane sits on a dolly mounted on top of a single
    rail track, about 30 ft. long and 3-4 ft. above the ground. The
    tow plane takes up the slack, the glider shoots down the track,
    the dolly stops abruptly at the end, and the glider shoots into
    the air well above flying speed. I've seen video tape of this and
    it works well.
    
    Your ASW-24 sounds like a nice plane. Too bad it would cost >$400
    over here.
    
    Terry
    
1235.5Full Scale ASW24USRCV1::BLUMJMon Aug 06 1990 17:3718
    By chance I ran into an old friend of my father's at the local airport
    as he was cleaning off his latest sailplane, you guessed it an ASW24.
    I first met this fellow 24 years ago when he was flying a K6.  Since
    then he has owned many different sailplanes including Diamant, Cirrus,
    Hp14 and a couple others I don't remember.  This guy has been flying
    Sailplanes for over 30 years, so I asked him to tell me what its like
    flying an ASW24.  The fit and finish of this ship are so good that with
    tape on the joint between the wings and the fuselage he claims there is
    absolutely no noise whatsoever.  He claims the drag is so low on this
    ship that there is no noticeable difference in the horizon at 60 knots
    per hour or 80 knots per hour!  The wing and tailfeathers had
    turbulators glued to their respective surfaces.  The L/D of this ship
    is 44-to-1 at 60 knots.  It truly was a work of art.
    
    
    Regards,
    
    Jim
1235.6flying ROBBE's ASW24KBOMFG::KNOERLETue Aug 07 1990 09:1661
	FLYING the ROBBE ASW 24

	After the past long weekend (Friday & Monday off) I'm able to 
	report about the flying characteristics of my ASW24. First I have
	to appologize for my bad English :  what I meant with "start car"
	was something with wheels to put my glider on when hi-starting from
	the ground. Meanwhile I made approx. 15 high starts by myself and with 
	your advises I won't build a start dolly (I guess that's what I meant). 

	After I got used to the launch with winch doing everything by myself and
	learning that if the nose will be too much up the plane will fly
	horizontal with a tendency towards terra firma (Uffff, 'was real
	lucky...) - it's the way to launch ! The ASW24 goes up like on
	rails, the rudder efficency is good during the launch. (Otherwise
	the plane would have crashed at the first launch, when the tow
	was laying in the gras not straight producing too much drag until
	it got straightened out). On the top I stopped the winch, a little
	down elevator to accelerate and then up - the tow released and the 
	plane gained several meters on altitude. (is this called zooming ??)

	The turns have to be flown with ailerons rudder and elevator to turn 
	fast. When flying the plane too slow the turns must be wide not to 
    	loose altitude. If it's been flown faster the turns can be 
    	surprizingly (sp ?) short, with a very small radius. When searching 
    	thermals I prefered flying slow though.

	On Sunday I went to a slope, the wind not too strong, maybe 10 mph.
	(was to less to get the plane soaring in the wind with no forward 
	motion related to ground). After hand launching I turned parallel to
	the slope and it gained altitude imediately. The turn was easy to fly
	since I trimmed a little "down" and the plane flew fast. After a 
	while I was 300 feet high using thermal activity at the edge of a
	wood. A steep dive to build up speed was followed by a real impressive 
	roll with a duration of approx. 5 sec.- No no no, it was NOT a barrel 
	roll. The roll was straight (with down elevator while inverted of corse)
	After thermaling up a sequence of three loops followed without 
	correction, the plane still was in the same direction. 

	What I recognized when flying fast after a steep dive is the wistling
	noise. I wonder where this is coming from. Maybe the edge of the 
	cannopy that is a little deeper in the shape of the fuse, or is it
	the 1/12 inch thickness of the trailing edge of the wings ?  I don't 
	know.

	Terry, the plane (including GRAUPNER Spoilers) would cost $ 234.-
	Are you in CXO, I will be there from 13th August till end of August.

                      \\
                       \ \                    __
                        \  \                  \ \
                         \  \                  \ \
                          \  \                / \_\
                           \  \              /LO |
		        _^^^--------==========___/
		      <      \  \-''
		       '-___-'\  \            
			       \  \
                                \  \          Holm- und Rippenbruch,
                                 \ \
                                  \\                          Bernd
1235.77 hours south of CXOELMAGO::TTOMBAUGHHigh Plains DrifterTue Aug 07 1990 11:3111
    Bernd,
    
    I'm in Albuquerque, N.M. about 730 KM south of CXO, on the  same
    highway. If you should get a chance to come down on a weekend, we'd
    sure like to take you R/C glider flying. Drop me a mail message
    or DTN 552-2117 or home phone is (505) 821-0063. Look up Mark Antry
    or Ron Watts at CXO, they like to think of themselves as glider
    guiders too.
    
    Terry
    
1235.8Zzzzoooooooommm!HPSPWR::WALTERTue Aug 07 1990 17:1626
	Bernd,

	That ASW24 sounds like a nice plane. Any chance you could get a video
	of it, or at least some still pictures? We could show it at the DECRCM
	meeting.

	Regarding the "zoom" launch, what you described is almost a zoom. When
	you have about reached the top of the launch, a zoom is executed by 
	pointing down the nose of the glider and giving full winch power. This
	gives the plane enormous speed. You then pull the plane up at the same
	time you back off the winch power. You can use the speed to gain more
	altitude,  or simply to fly fast in a particular direction. When done
	properly, the zoom gives you more altitude (or energy) than just 
	floating off the hook at the top. When done improperly, it gives you
	several large glider pieces falling out of the sky at various speeds.
	The wing halves usually come down last.

	At least that's how I zoom. Someone else may have a different technique.
	I would recommend not zooming until you have more experience using a
	winch. You also have to consider the strength of the wings, since even
	properly executed a zoom puts a great deal of stress on the center of
	the wing. At virtually every glider contest I have attended, at least
	one person has folded his wings on launch, and it frequently happens
	to very experienced pilots.

	Dave