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RE: New Radian - 5/20/2009 2:44 AM   
Tom Nied



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Well I experimented with the Gorilla Glue that dries white and is 2X faster.  Although it bonds to foam, like you would find in a Styrofoam cooler, when I put a drop on the edge of one of the Radians wings, when it was dry it just peeled right off.  Its sort of like when I mix epoxy on one of those plastic covers for a coffee can.  Once it's cured, you can peel it off and reuse the cover to mix more.  I'm not even sure epoxy is a good idea.  At the Horizon website they say use any CA (even regular CA not for foam) on the "Z Foam" or RC 56 Canopy Glue.  With the extensive break I have to deal with on my fuselage, I think I might try CA.  With the RC 56, I'm afraid the seam might seal off and not let the inner glue to dry.  I wish I had some scraps of "Z Foam" so I could run some tests.  Guess my plane will have to be the experiment.  It's good to know what worked for your Brother.  One suggestion I'm seeing is to lightly spray one side of the break with accelerator and medium glue on the other.  When joined you have a little time to get them together, but the accelerator will kick off the CA. I don't seem to have any of the foam cells missing so the gap should be minimal.  I like the idea of the toothpicks, and even my techno knowledgeable g/f suggested wood that spans the gap.  But ultimately I think once glued back together, I'm going to use some fiberglass material with RC 56 over the seam.


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RE: New Radian - 5/20/2009 2:51 AM   
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Let us know how it comes out, would like to know how larger repairs work out. Hope it holds for you no matter what it looks like. I'm dreading my first bad wreck and attempted repair, but sooner or later...



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RE: New Radian - 5/20/2009 3:09 AM   
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I like the Gorilla Glue, and can see how it might be an incredible adhesive.  But we're talking "Z Foam", or Elapor, and not a lot sticks to it.  If this were a balsa and plywood model, epoxy for sure would be my adhesive of choice.  I'm going to work the CA method, it seems the right choice for this material.  Then on the outside, a nice wrap of thin fiberglass with RC 56 thinned out.  I think that will hold it together.

Cant wait to get into another thermal.  It's addicting.

Thermals to you, my friends.  Tom


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RE: New Radian - 5/20/2009 3:12 AM   
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Tom, sorry to hear about your Radian.  But as snuts said, you'll never forget that flight.  I definitely understand how easily the radian can get up and away from you.  Had mine out this weekend at the club field and one of the glider guys told me to "head over under that cloud"....well it was like hitting an elevator....she was specked out in no time.  I did a semi high speed pass when I got down to a better altitude and heard a nice swoosh as she flew over....nice!

Got another good tip....if your glider starts to get to high, keep putting in up elevator and stall her down to a more comfortable height.  That way you don't stress the airframe.

  

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RE: New Radian - 5/20/2009 3:46 AM   
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Yeah, thanks matrix.  When I knew I was in trouble, I just gave it "UP", thinking I would loop or porpoise down to an easier to see altitude.  Problem was that it was so high that I lost visible contact with it.  Then I didn't even know where it was. I generally use the  visor of  my cap to frame the area of where it's flying.  Problem was that it was just so high it seemed to disappear.  I got to remember when it gets that high, its time bring it down and then find another thermal.  It is so amazing to get into a thermal.  I'll keep trying.


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RE: New Radian - 5/21/2009 3:41 AM   
Tom Nied



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Regular CA works just fine.  With a large breakage like my fuselage,spraying one side with accelerator and applying slow setting thick CA to the other, the two pieces bonded very securely.  Some "oozeout", but I carefully sanded the glue line.  I probably will span the break line with Silkspan and RC 560 glue thinned out.  But the "Z Foam" definitely bonds with regular CA.  No dissolving. My Radian will fly again.  Photo when I complete the repair.


< Message edited by Tom Nied -- 5/21/2009 3:46 AM >


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RE: New Radian - 5/21/2009 5:08 AM   
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That's good to hear , glad you won't have to spend to much to get it back up again. Wanted to get out today(everyday actually)but winds were close to 50mph! Gadzooks, that is just way to much. I've been going out whenever I can lately within reasonable wind up to 15 mph or so. No problem flying it, just hard to stay in the lift zone when it's gusty and blowing pretty good. Bro is comming up over weekend so we are gonna have soarfest 09 and compare notes on what works for us. For a rank beginner to any kind of flying he is doing fantastic and hope more people get our enthusiasm for this awesome hobby. But, getting late and need to kick a path through workshop. Between on/offroad 1/10-1/8scale, the 12-15 planes rtf, and all the normal accumulation I gotta get my rear end in gear and get some serious shop cleaning done fast. Radian rocks!!!

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RE: New Radian - 5/28/2009 3:07 AM   
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Hi all, finally got my radian yesterday. Can't wait to maiden her. I was after a pnp version but my local HS couldn't get one so they split up an rtf version for me. I then got the battery and charger for only $40AUD extra so no need to solder on different connectors and the COG should be perfect.

Just one thing about the Radian, is it for real that only tape (and the control arm) hold on the horizontal stabiliser? It seems a bit weak, has anyone had a problem with this? I didn't bother with the weak tape that they provided and used some filament tape.



< Message edited by loungefly -- 5/28/2009 3:08 AM >


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RE: New Radian - 5/28/2009 4:08 AM   
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The economical tape ( I thought they forgot to put it into the box, but it was the peel off a backing type)  they supplied worked just fine for me.  The four pieces even held through my last crackup.  I thought it was weird initially but it holds just fine.


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RE: New Radian - 5/28/2009 5:01 AM   
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Man! Somethings up with the site as everytime I hit backspace, it takes me back to previous page and I lose what I typed, RAAAWWWRRR! Anyway, the tape is fine for this fine flying bird. I had my doubts about some things on it as well, but after first flights all was good. Only that should have been mentioned sooner was to check wiring from esc to motor and battery. Noticed some dust behind motor on mine, turned out the motor can was rubbing on motor wires and wires from esc to battery, yikes! Motor to esc wires were minorly scuffed, but esc to battery wires were rubbed clear through to shiny wiring on both +and-wires. Glad I caught it before a bad short smoked the battery or worse. So check the wiring is no way near the motor can. If your brand new to thermal hunting, it might take awhile to recognize when your in lift, but the radian makes it pretty easy on you. If you're going from left to right or right to left, it is easy to see when you hit lift areas, the whole plane rises noticably, on mine the tail pops up so the nose is pointing down, but you can see it rise easily. Sometimes, regardless of direction it is heading, you might see one wing suddenly start to raise, and the plane turn slightly one way, that means your right on the edge of the thermal and as the rising air lifts the wing, it tries to turn away from the lift. So, if you see a wing lift, turn into it and try a few circles to see what happens. In light lift it can be harder to see the signs, but it didn't take me long to figure it out for the most part, and I kinda learn slowly at new things, but that comes with age I guess. Oh, reminds me for the newer guys, if you notice when you're circling tightly, without some practice you stall on one end and dive on the other, don't sweat it. You'll notice soon that when in lift and you stall it, it recovers almost instantly without losing much altitude, when circling in sinking air it rarely stalls and circles very pretty, but doesn't go up any.

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RE: New Radian - 5/28/2009 6:03 AM   
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Thanks for the advice. I have taken it onboard and will look at maidening her this afternoon.

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RE: New Radian - 6/1/2009 11:13 PM   
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Hey all,

I recently purchased a Radian PNP, received it friday, and flew it sunday. It was awesome! My dad and I took turns with about twenty minute flights a piece. We used up almost all of one 2200mah pack and just a fraction of the other with six flights. The thermals weren't too hard to stay in once i found them, but then the sun went away which didn't help much. This thing is amazing!!!!

Jake



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RE: New Radian - 6/2/2009 2:51 AM   
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Haha! Another couple guys hooked, muhawhawhaw. Everytime out I get a little better at finding and staying in lift, it just puts a huge grin on my face when it goes from getting ready to land to working some low level lift then specking it out, SWEET!

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RE: New Radian - 6/4/2009 7:47 AM   
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I had the push rod sheath for the elevator come lose from its seat at the end of a powered climb the other day. It affected the elevator and gave it quite a bit of down elevator. The radian started to dive very quickly towards the ground. Up elevator wasn't doing alot but did slow its speed down. It was difficult to land and it nosed in a bit. Unfortunately i have a slightly crumpled nose and cockpit area and the canopy doesn't fit properly. Will have to try the boiling water trick to see if i can get her back into the original shape.
Where the push rod sheath comes out from the fuse near the tail now has filament tape on it (both push rods) to stop this happening again.

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RE: New Radian - 6/4/2009 2:45 PM   
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Was it not glued from factory? I notice after seeing a few of these that the glueing on the fuse halves is not very consistent. Saw one that the "break" on the one side of fuse had no glue at all in it. Still an awesome flyer even with minor work to be done. Have a "how high altimeter" comming either today or tomorrow, so will find out average altitude I shut down motor, how high I speck out...Should be fun!

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RE: New Radian - 6/5/2009 4:44 AM   
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It was glued but not too well, obviously!! The boiling water worked well, seems to be stronger now than before the crash! The canopy still doesn't quite fit, its out at the front by about 2mm but the magnets still line up. It shouldn't affect the aerodynamics.

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RE: New Radian - 6/5/2009 8:35 PM   
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Good that it's ready to go again, yeehaw! I checked mine after you said your pushrod sleeve was loose, mine was as well. The staple that holds it to fuse had pulled out 3/4 of the way on elevator side. A spot of glue and a wrap of clear tape did the trick. A wrap of tape around fuse right by tail really stiffened it up a lot as well. Anyones wings starting to get loose fitting yet, other than caused by hard landings/crashes? Mine still fit tight in fuse but wing rod is starting to get a little loose. Probably from diving out of thermals way up and pulling loops after diving for several hundred feet.

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RE: New Radian - 6/14/2009 9:56 AM   
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Have any of you Radian Lovers tried flying contests with your Radians? If not, here is a format you might try. IT is referred to as X5J. ere is a like to the discussion.
http://www.lisfsoar.proboards.com/i...isplay&thread=3

The link is to the forum board of our club. the format is explained and there is some discussion about the contest format, but I am going to copy the rules here. We did not develop this format, but I can tell you we are having fun flying the fun contest.


X5J CONTEST RULES

1. Any electric powered sailplane or other electric aircraft can enter the contest. Any battery arrangement is acceptable.

2. The number of rounds will be set by the Contest Director with a minimum of four (4) rounds needed to declare a valid contest and the norm being 5 rounds.

3. Flight times per round will also be set by the CD and can vary from round to round. One point is scored per second of flight time and one point deducted for each second over the target flight time. Flight time starts when the plane leaves the pilots hand and ends when any piece of the plane makes contact with the ground. The maximum points possible on any single flight are 60 pts X the target duration in minutes. Round the flight time to the closest second. The normal target time for a round is 8-10 minutes.

Example (using 10 minutes as the target duration):

9min. 50 sec. flight = 540 points + 50 landing points = 590 points
10 min. 4 sec. flight = 600 points – 4 points with 0 lanidng points = 596pts

4. Motor run time is unlimited but subtracted from the flight time (note para 4 below).

Example:
600 flight points - 19 motor run points = 581 total round points

5. Thr Radian would have a motor handicap of .95% as we fly the contest. Or you could just make it 100$ and keep it simple. If you mix in other electric gliders or aircraft then you can apply motor handicaps.

Motor handicap: brushless 95%, brushed Cobalt and brushed car motors 75%, Ferrite 45%, and Outrunners with a 28mm or less bell diameter and 17mm length 68%, Speed400 30%. Actual motor run rounded to the closest second is multiplied by the motor handicap percentage. Round this calculated value to the closest 1/10th of a second.

Example:
Cobalt motor run 34 .6 sec. = 35 sec. X 0.75 = 26.25 sec. = 26.3 points.
Brushless motor run 41.3 sec. = 42 sec. X 0.95 = 39.9 sec.

6. Landing points are measured from the center of the landing circle to the nose of the plane. For each foot from the center point subtract 1 point from max of 30 points.

Example:
Plane wing tip is 12 ft from the designated center point. 30 – 12 = 18 points.

7. You may restart your motor as many times as needed but on the second motor start you will no longer be able to score any landing points.

Contestants will not have to do any of the above math shown in the above examples. The CD’s spreadsheet will handle all of that.

Timers need two stopwatches, one for flight time and one for motor run time. Pilot and timer should work out a signal as to when he is starting the motor (i.e. "restarting motor...on...off") so the timer can track that time.


So, if you want to test your skills and have some fun with your friends, try our X5J contest format. It is lots of fun.


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RE: New Radian - 6/15/2009 2:21 AM   
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Wish I had a sailplane club close by. This sounds like a fantastic "competition" for anyone who wants a great time and you won't be at any dissadvantage with a lowerpowered less costly system. I think this is just what many clubs need to get more participation and people don't have to feel like their easy glider or radian is going to be outclassed by a 6000$ full composite ship. Great idea! Just wish I had somewhere close by to participate. This would also be a great addition to many funflys, where almost anyone has a chance of scoring well. No one to compete with here, but going to practice it anyway to help with spot landings and whatnot. Also just sounds like fun to do, by yourself, in my case, or with a gaggle of birds all at once.

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RE: New Radian - 6/15/2009 4:23 AM   
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Ok I need some "take off" advice. I have had perfect take offs and some horrible take offs. I find it very hard to control the radian under power. I guess the questions are what is optimal throttle to get it up and away from the ground? and how to launch it in stronger winds of around 10 to 15 knots? (don't know what that is in miles)
I have had it take off, go vertical and then flip over and hit the ground. Thats not fun, maybe too much throttle.

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RE: New Radian - 6/15/2009 4:50 AM   
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15 knots is approx. 17 mph.  That is is kind of overly breezy conditions to fly the Radian.  Just not as much fun as when the winds are down around 4 mph.  Also the thermals are moving at that speed as well, so hard to get any useful free lift.  But I have tried to fly mine in less that exceptional winds and  with the launch, I always throw it straight into the wind at about 15 degrees above the horizon, just so that I can get control of it in the first stages of flight.  Once under control I'll pull back on the elevator and try to keep a 70 degree ascent with 80% throttle.  In about 10 seconds it really gets up there.  Judicious down elevator so that it doesn't do that flip over you describe, and just try to keep it straight into the wind and work it up to some good altitude.  I have added nose weight in windy conditions, but with only marginal benefit.  Seems the Radian is happier with lower wind conditions than you're describing.  Get it out on a better day, and you'll see what I mean.  When I flew it in windy conditions, it just didn't  seem as fun.


< Message edited by Tom Nied -- 6/15/2009 4:51 AM >


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RE: New Radian - 6/15/2009 4:54 AM   
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First thing, make sure the balance point is spot on at 2.5inches  untill you really get used to flying it. What I do is throttle up to about 1/4 throttle, and give just a light push away into the wind. Then go up to 1/2 throttle for awhile to gain altitude, correcting with elevator as needed. Then I go full throttle after a hundred feet or so, doesn't take long. I think the trick is to watch closely, and try to keep from climbing straight up, giving down elevator as needed. It will climb vertical, but with wind it pushes it over the top and either loops or noses in. So, just try to keep climb angle about 60-70degrees and just use 1/2 throttle until you get used to controlling it. I know at full power mine tends to torque to the left and it is kinda tricky keeping it straight until you get used to it. If you can keep angle low and not climb to fast, it goes much easier at first. Hope this helps a little bit.

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RE: New Radian - 6/15/2009 3:19 PM   
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On a calm day, hand toss, and set trims. I assume you have done this step. Add a small amount of power, or none (calm conditions). Launch forward , as close to level as possible. As you would a paper airplne, but with grace. Once both hands are on the transmitter, apply more power, say 50%. As CBM said, straight out and up at no more than 45* untill you are twice the height of a telephone pole. Then add more power, flying it as you go. If you get at all wackey, power OFF, then get control, and level before re-applying power.
Altitude is your friend, when applying power. Everything changes as you add power on an assisted GLIDER. If this is your first R/C airplane it is a great learning tool. Be smooth and deliberate in your flight circuit.
Smooth landings -Snuts-



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RE: New Radian - 6/16/2009 2:06 AM   
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I think my main problem was trying to launch it into too stong winds. I get a bit impatient  waiting for a calmer day. I just want to get the thing up there and learn more about it. Also i think i have been launching it on an angle that is tooo steep.
I should add that most of the time i fly this beauty it takes off no problems and i have had it up there for 35 mins one time with about 1 min of throttle total.
Thanks again for the advice .

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RE: New Radian - 6/17/2009 2:44 AM   
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Anyone do any mods to their radian? Thinking of adding flaperons along 3/4 of the span so as to be able to adjust camber and reflex and to see if opposite ailerons help keep turns flatter in light lift. Also, anyone do a little stretch job to the wings by splicing in a foot or so from crashed wings? Wish I had a couple spare wings to slice and dice and splice to test with. Let me know if anyone tried these ideas out and what the results were, thanks!

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