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Hi-Performance and Sailplanes RC hotliners, electric pylon racers, F5B, F5D, sailplanes and gliders

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Old 09-29-2008, 03:34 AM   #1
AEAJR
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Cool Radian - a new plane from Parkzone

Guys, Parkzone is releasing a new plane in October, called the Radian.
http://www.parkzone.com/Search/Defau...erm=pkz_radian

The Multiplex Easy Glider has been such a success, it seems Parkzone wants some of the electric glider market. It seems that a lot of the parkflyer crowd have found that gliders are another great from of electric flying.

I guess the idea of getting 60 minutes or more on a single battery pack is just too attractive to ignore.

Video:
http://www.youtube.com/watch?v=t4558ASDvfo

This one looks like fun!

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Old 09-29-2008, 03:57 AM   #2
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Large 2-meter wingspan makes Radian easy to see and provides excellent lift-to-drag ratio
AEAJR::This is sweet1 thanks my bub, steve

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Old 09-29-2008, 04:28 AM   #3
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I'm keeping an eye on it also. Was planning on getting the EZGP, but at 160 for the PNP version, it looks really nice. I'll just wait and see what other people are saying about it.
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Old 09-29-2008, 05:33 AM   #4
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how do u land without breaking your prop?
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Old 09-29-2008, 01:53 PM   #5
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The prop folds.

Normally you will use the motor to take the plane to "soaring height", maybe 500 feet. Then you power off and the prop will fold back to greatly reduce drag. Now you go thermal hunting. Tons of fun.

When you land, you land with the motor off, the prop will be folded.

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Old 09-29-2008, 04:23 PM   #6
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Figured so, how exactly do u "hunt" or "find" thermals? Is there a website explaining all this glider stuff?
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Old 09-29-2008, 05:46 PM   #7
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Finding Thermals
by Ed Anderson
aeajr on the forums

A thermal is a column of warm rising air that occurs when one section of
the ground warms faster then other sections. As the air raises it draws in
more air. Think of a very slow moving tornado. Not exactly correct but
close enough for first approximation.

http://www.apogeerockets.com/educati...g_thermals.asp

TIPS ON FINDING THERMALS

The best conditions are calm air, hot sun and low humidity. Some big dark
areas surrounded by lighter areas will help to create thermals, so look to
see if there is anything like that on or around your field. A freshly
plowed field is good. A parking lot works great! A large building
with a black roof is awesome.

However I have caught thermals at 35 degrees F in 15 mph winds. They can be
weak and they move fast, but the are there!

What do thermals look like?
http://www.flyaboveall.com/mountain...ermalclinic.htm

Here are some thoughts on the hunt!


LISTEN WITH YOUR EYES

Get your plane up high, the higher the better. A long hi-start can get you
400-600 feet up which will give you several minutes of glide if you don't
find any lift.

If you have a motor, cut the motor and trim the plane for nice level flight.
Now, focus on watching the plane and keeping it on a nice steady glide.
Steady as she goes. Try to keep your hands off the sticks as much as
possible.

Let the plane ride with and across the river of air, giving it only
occasional input to keep it going in the general direction you want to go,
but don't be a stickler about it. Let it drift like a fly on the surface of
the river, waiting for a trout.

If you listen with your eyes, it will speak to you, but you have to listen
patiently.

Glide across the wind, not directly into it and not with it as it can be
hard to see what the plane is doing when it is going directly away from
you or coming directly at you. Sort of a 45 -60 degree angle left for a
while then a 45 to 60 degrees to the right. Nice and slow and easy.
You want to cover the sky and search the moving river of air, like a
bird looking for food.

As you are flying, watch the wing tips the nose and the tail. If a wing
seems to bump up, or if the plane seems to become buoyant, floating up for a
moment, it could be a gust, or you might have just brushed a thermal. Go
gently into a slow turn in the direction of the wing that rose. Thermals
will try to push you away. If you see the nose come up for a little while,
then drop a few seconds later, you may have gone right through the middle
of the thermal. Turn gently to circle back into it. It will be moving with
the wind, so
don't try to keep the plane in one place in relation to the ground. As you
work
thermals it is natural for your plane to travel down wind as you circle.

Try to make a circle, but not too tight or you will lose too much altitude.
Try for about a 100 foot diameter at first. Complete a couple of turns
and see if the plane seems to be rising at some point in the circle. If it
is, just stay with the turn and try to find that area where it rose, the
start to
focus the plane into that area. If you find the rising air you are trying
to
keep the plane in that air column. If it is rising you can apply a little up
elevator in your turns, but not much. You don't want to stall and you don't
want to scare the thermal, you want to bond with it.

Try to observe if the plane is rising steadily, or if it seems to rise and
fall. That could mean you are not centered in the thermal, so work your way
more toward the side of the circle where the plane rises.

Remember that thermals move with the wind, so you are not trying to stay in
one place in relation to the ground. The air is like a river and you are
trying to stay in a little whirlpool that is moving with the river.

If you go into the turn and make a couple of turns with no success, then
just resume the search pattern I mentioned. Angles across the wind. Not
into it and not with it.

A sailplane in lift - This is an AVA 3 M sailplane
notice he is hunting, then he hits!
http://www.rcgroups.com/articles/liftzonemag/2004/mar/ava/Ava2.wmv
As you watch the video, notice the light poles and how the plane tends to
drift from right to left. He is circling more than usual as he feels he has
lift in the area and is trying to find the center. That is the direction of
the wind. Using the
tops of the trees as reference you can see that he is rising.

If you are getting out too far, work your way back the same way, angles to
the wind. Remember it will take longer to go up wind than down wind and
you will be losing altitude all the time, if you don't find lift.

Finding elusive thermals
http://f4bscale.worldonline.co.uk/Thermals.htm

Unless you hit a boomer, you are not going to immediately know you are in
lift, so you have to watch the plane. Sometimes it becomes apparent because
you realize that your not sinking but appear to be holding altitude. The
only way to do that is to be in lift.

Remember also that thermal can vary in size and intensity. Some are fairly
narrow and some are so large that it seems a whole region of the sky is
in lift. I rode one area recently for 58 minutes where it seemed about 1/4
of the field was in lift. In this case, I didn't really have to circle. I
just flew back and forth and the plane rose beautifully. Those are really
nice, when you find them.

If you are flying an electric glider, or even an electric parkflyer, if you get down
below 100 feet or so, it can become hard to catch a thermal so power back up
to 400-500 feet and begin the hunt again, working new areas of the sky.

It is a hunter's game, if you are up for it.

Good luck pilot! May your hunt go well!


Welcome to the Novice Lounge - A resource for new thermaling nuts!
http://forums.flyesl.com/topic.asp?TOPIC_ID=224

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Old 09-29-2008, 06:03 PM   #8
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thanks
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Old 10-09-2008, 07:09 PM   #9
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Has anyone taken delivery?

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Old 10-09-2008, 09:56 PM   #10
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out of curiousity, how does something like this handle a 10-12 mph wind? never flown a glider/sailplane before.
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Old 10-09-2008, 10:14 PM   #11
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I can't comment on this particular plane. I can say my Easy Glider electric does fine in 10-12 mph winds. If it gets too bumpy I just add some ballast ( weight ) and it smooths out pretty well. Have had it out in higher winds than that.

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Old 10-09-2008, 10:19 PM   #12
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Originally Posted by AEAJR View Post
I can't comment on this particular plane. I can say my Easy Glider electric does fine in 10-12 mph winds. If it gets too bumpy I just add some ballast ( weight ) and it smooths out pretty well. Have had it out in higher winds than that.
good to hear. seems like a definite possible buy with the low price. always good to have a plane to kick back and relax with.
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Old 11-02-2008, 10:53 AM   #13
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Radian arrived a few days ago, its everything they say it is, beats the Easy Star tho a wonderful trainer, it will go up in light lift, brushless motor go easy on first attempts, it goes up on just half throttle, just keep the nose level on launch and let it gain airspeed, the landings need room, will glide along ways at low elevation, zig zag helps here, lands silky smooth, nothing like it, its a true floater, behaves very well, tho a raw beginner should watch it as easy to over control as gliders have the slow response issue until your use to it, hope the weather is ok today, can't wait for another outing...<>..BEST

For newbies yet to fly gliders,
I launch this one just over 1/2 throttle, keep the nose level and let her go out aways before even thinking about making any turns, need to get things flying well before any turning inputs, once in the air and some elevation go easy on the controls, don't let it stall, be sure and fly in a larger area then your use to as this one gobbles up room in a hurry, be patient on the landing, its amazing how long it takes to come down, so stay on the outer area of you landing zone till she gets low and drop the nose abit helps here, was mention of quick throttle only enough to open the blades as these also will help on slowing things for coming in, a great idea...BEST ..<>..
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Old 11-02-2008, 05:39 PM   #14
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Originally Posted by AEAJR View Post
Has anyone taken delivery?
.
There's one at the LHS.
Somewhat crude wing, the trailing edge is a good 1/4" thick.
For R/E I guess it will be OK, but there's more versatiility in the Easy Glider.
Store price is $249.
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Old 11-04-2008, 03:52 AM   #15
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Does anyone out there have both the Radian and the Easy Glider, even the famed Easy Glider is not the contender for skilled contest flying, according to my sailplane friend, tho it flys well...

Perhaps the Radian is slightly more forgiving for the raw beginner, just a thought...

BEST ..<>..
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Old 11-04-2008, 05:22 AM   #16
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Neither of these planes are high end contest ships, nor do they claim to be. They are sport gliders and make great first gliders.

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Old 11-18-2008, 02:23 PM   #17
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HEAT AND ESC FAILURE

Anyone having a problem with the ESC? One of our club members just got a Radian. We had it out flying one day, around 50 degrees. Longest motor run was probably 2 minutes. The next time he tried to start the motor it would not work. Horizon thinks the ESC failed. Read the note from my buddy.



Ed

They highly recommend not to use full throttle-3/4 to climb would be
the best. They say things heat up pretty fast when the throttle is
wide open!!!!!!



Guys,

Are there air holes to allow cooling air to flow over the ESC and battery? We were flying in 50 degrees on a cloudy day. What would happen if it had been 90 degrees and sunny?

Anyone having problems?


I have seen this happen on Easy Gliders when guys fly them around like parkflyers. EG has vent holes but the exhusts are very small. You have to open them up. Not sure what the Radian has.

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Old 11-19-2008, 06:41 AM   #18
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I always go easy on the throttle on mine, it climbs very well at the lower settings, short periods of time required find the battery stays cool, simply don't push it and she should last a long time...<>..

Is a grill like opening on the bottom fuselage, thought I saw even a light there in early dawn launch, yet to check it out...<>..

Just don't fly it aggressively at full throttle for any extended time..<>.

Yep these are simply very nice gliders, not for contest flying, but certainly I find the Radian far above average, its a nice performer, light lift up she goes easily, excellent...<>..
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Old 11-19-2008, 12:23 PM   #19
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Default Finding thermals

Another way to source thermals is to watch for large birds soaring, that's the easy one or by feeling the wind on your face. Imagine you are standing with your face into wind & suddenly the wind shifts across you at 45 degrees, the wind is blowing towards the thermal, replacing the air that is rising, so launch your glider where the wind is pointing.
That's what my fiance has just told me, he used to slope soar & catch thermals to get up thier & circle with the birds.

Kirsty x

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Old 11-19-2008, 03:46 PM   #20
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Hints for newbies flying the Radian

I'm not a competive sailplane flyer, but my maiden ventures into rc were the sailplanes, slower, larger visual, make excellent trainers...

The Radian is a tad above entry level, strong brushless motor, slightly responsive, all gliders have this slight delay before reacting to your sticks, so easy to over-control.

I still strongly suggest a newcomer have an experienced glider pilot to assist on maiden flights and have things balanced, and trims set corrrectly to fly...

If you fail to keep things level on launch its likely to turn on you and even spiral into the turf...too much up elevator or wrong balance she will porpose up and down roller coaster effect finally stalling again into the turn..

You need larger areas to fly these as they have a very long glide, at only half tree top level or less mine covers a complete football field before settlling to land and even then some zig zag required to help reduce altitude, against a moderate breeze its amazing how far she glides...<>..

Keeping the nose level she will land with ease softly skimming the ground, a site to behold...<>..

Most of my other flyers I usually use a very slight or even held up elevator on hand launches, not with the Radian, I actually ended up with the slightest down elevator using over half throttle with this babie, she goes right up, just watch the nose and down stick till she reaches airspeed, no turns till it makes some altitude then go easy on the sticks...<>..some are more aggresive on the launch reaching altitude quickly, my favored is near 1/2 throttle gently going up and also watching for lift, thermals is where the fun begins, its rather obvious with this glider, lighter lifts she responds, simply watch her path and you'll know right away when your in any of the stronger thermals, stronger lifts want to push you out, use down stick if necessary and up you go with throttle off for an amazing ride, your hooked...super fun experience...<>.

BEST ..<>..

Psst other recent gliders I've flown, larger Ventura, Ascent, do well but nothing near the Radian, infact fly like a rock in comparison, don't count these others out, make very fine entrys for gliders, just that the Radian flys so much better indeed...<>..
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Old 12-01-2008, 07:08 PM   #21
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Cool

Originally Posted by AEAJR View Post
HEAT AND ESC FAILURE

Anyone having a problem with the ESC? One of our club members just got a Radian. We had it out flying one day, around 50 degrees. Longest motor run was probably 2 minutes. The next time he tried to start the motor it would not work. Horizon thinks the ESC failed. Read the note from my buddy.



Ed

They highly recommend not to use full throttle-3/4 to climb would be
the best. They say things heat up pretty fast when the throttle is
wide open!!!!!!



Guys,

Are there air holes to allow cooling air to flow over the ESC and battery? We were flying in 50 degrees on a cloudy day. What would happen if it had been 90 degrees and sunny?

Anyone having problems?


I have seen this happen on Easy Gliders when guys fly them around like parkflyers. EG has vent holes but the exhusts are very small. You have to open them up. Not sure what the Radian has.

AN UPDATE ON THIS SITUATION. I DON'T THINK THE ESC FAILED!


MY MOTOR WON'T RUN - WHAT'S WRONG?
A tip for new pilots - Setting the throttle to zero

In order for most ESC to arm, so that you can run the motor, they require that you move the stick to zero throttle. But, is it really at zero?

There is a trim on the throttle channel, just like the other channels. On glow planes they use this to set the idle, so the motor won't shut off when they go to zero throttle position. In other words the throttle isn't really at zero.

But we don't have to worry about idle on electric models. So we want the throttle to be able to go to zero.

Now, if your throttle trim is set to the center, then your throttle channel is not really going to zero. This can result in your ESC not arming and not allowing your motor to run. If this happens to you, move that trim on the throttle channel till it is all the way down, to zero. Now see if the ESC will arm and the motor will run.

This came up because a friend with a new Radian had this problem. When he called for support, they thought it was a defective ESC and sent him a new one. But that one did not work either. So he called me. Well, I have been down this path before, so after trying a few other things, we moved the trim all the way down.

Bingo! His motor now works and all is right with the world.

Just a tip from someone who has made this mistake before.

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Old 12-01-2008, 07:43 PM   #22
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I have one ESC that if you don't leave it a few clicks up when arming , go'in full to set then go'in to all the way back,then set the trim to "o" and it arm's! bub, steve PS if they recommend never go'in full power-the ESC it's piece-0-crap and not near big enough for the job, E-fight go'in to he11 in a handbasket

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Old 12-01-2008, 11:32 PM   #23
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Noticed arming mine if the throttle is up when battery hooked up it refuses to arm, likely a safety feature, but simply lowering the throttle all the way down then disconnected and reconnection of battery it all comes to life....BEST ..<>..
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Old 12-02-2008, 05:18 AM   #24
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Originally Posted by AEAJR View Post
Finding Thermals
by Ed Anderson
aeajr on the forums


A thermal is...etcetera...
Hey Ed, does this article exist on a thread of it's own? i'd like to save (and print) it.

"Give a man a plane and he'll fly for a day.
Teach a man to build a plane and he'll fly for a lifetime"
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Old 12-05-2008, 06:57 AM   #25
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Winter thermals, not as strong but certainly are there...

Thermals in December, amazing as usually best time for lift is in the summer, just today hit a mild lift near noon at 20 degree temps, it wasn't a strong lift but held altitude for several minutes, knew I was in one as using low throttle for making some elevation but suddenly the Radian responded by going up rather quickly, simply zig zagged the area with power off, tho not lengthy as in the summer was a very decent ride...neat...BEST ..<>..
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Anybody see this plane from parkzone? GreenAce92 ParkFlyers 21 03-17-2008 05:44 PM
Parkzone Spitfire as Beginner Plane? marchino61 Beginners 47 07-08-2007 09:03 AM
wtb parkzone plane parts nimitz Airplanes - Electric For Sale & WTB 7 02-05-2006 02:04 PM


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