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157" Discus Glider

Old 04-24-2008, 10:54 AM
  #426  
rockbus
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Default RE: 157" Discus Glider

what capacity A123s did you order 2300 ,3200?

Thanks
Old 04-24-2008, 11:07 AM
  #427  
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Default RE: 157" Discus Glider

2300
Old 04-25-2008, 12:41 AM
  #428  
rockbus
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Default RE: 157" Discus Glider

Stuffer,

how did you wire the cells up all 6 in series? or did you parallel two sticks of 3 cells in series?

Thanks for your answers I am not familair with using A123 cells, just lipos.

Old 04-25-2008, 11:11 AM
  #429  
stuffer
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Default RE: 157" Discus Glider

I didn't wire it but I would imagine they did it in series parallel with 2 sticks. I had used somebody elses battery for my first test flights. supposedly it was the same kind of battery. but when I put in the battery I got from battlepacks.com, I got 8500 rpm from that 14 x 9.5 prop. I flew it yesterday and it has so much more power I was amazed. it is more than this plane needs.
Old 04-28-2008, 11:19 PM
  #430  
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Default RE: 157" Discus Glider

Here are some pics taken from a fly-in last weekend in Eastern Washington. The glider is flying great and stays aloft for a long time in light lift. Fun machine!

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Old 04-29-2008, 04:35 AM
  #431  
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Default RE: 157" Discus Glider

those are some of the nicest in flight photos I have ever seen! beautifull.
Old 04-29-2008, 07:23 AM
  #432  
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Default RE: 157" Discus Glider

and what motor/prop setup are you using? battery? do you have any vents for cooling?
Old 04-29-2008, 07:59 AM
  #433  
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Default RE: 157" Discus Glider

Setup is an Axi 4120/18 outrunner with Jeti 70 amp speed control and Graupner 14x9.5 folding prop powered by a Flightpower Evo 25 6S 3300mah pack. This setup produces 1200 watts and will climb the glider nearly vertically, though it gets a better climb rate at around 45-60 degrees. I did cut some NACA-style inlet vents in the nose, which are a little hidden by the prop in the above photos. Exit cooling is out the top of the vertical fin behind the elevator mount and where the rudder pushrod exits the base of the fin. The canopy is held on with rare earth magnets so it is quick and easy to connect and disconnect the battery. Additionally with that setup I just left the receiver switch fully enclosed with no external on/off wire or charge port. I use a 2700mah Nimh receiver pack so flight time is limited by my transmitter pack and lift. The 3300 flight pack gives about a dozen climbs to altitude.
Old 04-29-2008, 08:06 AM
  #434  
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Default RE: 157" Discus Glider

a couple of things. where did you get your prop/spinner? I have the same setup.....but I forgot where I got it from. second, I notice alot of dehideral in the wing due to flex? did you use the standard 10mm spar?
Old 04-29-2008, 08:12 AM
  #435  
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Default RE: 157" Discus Glider

I got the prop and spinner from www.espritmodel.com . The spinner is a Graupner 45mm. I used the standard wing tube on the plane - it seems quite stiff but with 157" wings with that small chord and camber, some flex is going to happen. Better than being too stiff and snapping I figure.
Old 06-05-2008, 12:29 AM
  #436  
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Default RE: 157" Discus Glider

Just picked up one of these off eBay and everything looks pretty decent. the radio tray is already out and i plan on glassing the forward fuse section. I see the motor of choice for E-conversion is the AXI 4120/18. I have 2 motors in that range sitting on my bench and would like to know which would be better suited to this plane.

choice 1:
http://www.hobbycity.com/hobbycity/s...-drive_4030/10

The 4130 on this is the actual stator/magnet size, like how AXI's are measured. So its a bit bigger than the Axi's in use. The thing I'm wondering about is the lower KV rating of 385 vs 500 on the AXI but this can be made up by turning a larger prop right?

choice 2:
http://www.hobbycity.com/hobbycity/s...less_Outrunner
They claim 900 watts on this motor which from what i have read should be good for this bird but it is smaller than the AXI 4120... and I've learned to not always rely on published data. [sm=72_72.gif]

Thanks for your help!

Darren

Edit: I will be using A123 2300mah cells. My charger supports 8S but will only balance charge 6s. I have 20 cells on hand to make up what ever pack I need. Currently they are made up as 2 -10s packs slpit into 5s for charging. So any advice here is also appreciated!
Old 08-22-2008, 02:25 PM
  #437  
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Default RE: 157" Discus Glider

Has anyone seen one of these available lately? Looking for one but they have not been listed on E-Bay for some time. I have e-mailed the maker (WILL HOBBY) but of course they don't reply.

Ken
Old 08-22-2008, 02:48 PM
  #438  
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Default RE: 157" Discus Glider

DMA IN,
I used a PJS-5000 and put a secondary firewall to mount this monster.

It cam off the "trolley" at about 1/3 - 1/2 power.

Unfortunately the number on my plane was 2. Second flight, the rear alignment pins slipped out, and she went in....That was last summer, and I havent had the time to try and repair the fuze and tail boom's damage....

There's a short video on VIsion HObbies website (visionhobbies.com) if you want to see how she flew.

I also posted lots of pictures here on RCU about 15 pages ago of the contruction of this plane.

Good Luck in your buid and I hope your Bird's number is about 1 million.

Dave.
Old 09-25-2008, 12:32 PM
  #439  
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Default RE: 157" Discus Glider

Hi Folks. My son had one of these sailplanes for a couple years and he decided he didn't want it so he gave it to me. I have just begun to read this thread so what I'm posting may have already been posted and I just haven't gotten to it yet.

One of the o-ring grommets was missing from my kit so I took the other one to my local ACE Hardware store and I found what I think is the perfect replacement. The package is marked "#48 O-RING BAG P/N: 9D0035762B" and each package contains one (1) O-Ring. I centered the wing joiner rod in the fuselage then took an "ice cream stick" and packed the o-ring into the fuselage and it makes a very tight fit.

Right now I am contemplating towing the plane aloft but the electric power is very interesting to me.
Old 09-25-2008, 04:22 PM
  #440  
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Default RE: 157" Discus Glider


ORIGINAL: Weezy
Right now I am contemplating towing the plane aloft but the electric power is very interesting to me.
Mine took enough lead in the nose to balance that to electrify it will not add any weight. I think with this plane it's the way to go.
Old 09-29-2008, 09:47 PM
  #441  
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Default RE: 157" Discus Glider

Can this plane be flown without using the ailerons?
Old 09-30-2008, 05:00 AM
  #442  
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Default RE: 157" Discus Glider

Yes, you can fly it with rudder, but it is much more responsive with ailerons. I would never fly such a big bird just with rudder
Old 09-30-2008, 04:24 PM
  #443  
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Default RE: 157" Discus Glider

Thanks Joe. I know my Bird of Time does not use ailerons so I was curious.
Old 10-17-2008, 08:49 PM
  #444  
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Default RE: 157" Discus Glider

WOO HOO!!! Nitro Models has them IN STOCK!!! For $199! Mine is on route. I think I will do it up in Canadian registration, just because I can.


Ken
Old 10-17-2008, 09:05 PM
  #445  
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Default RE: 157" Discus Glider

I maidened mine today. Good bang for the buck. Did an aero tow with a 1.20 four stroke tug. I need to get more time on it before I give any more thoughts.....

I did remove the servo tray and added 4 layers of 6 oz glass from nose to first former. Then cut a hole in the bottom and added a wheel. Worked well.
Old 01-27-2009, 04:25 PM
  #446  
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Default RE: 157" Discus Glider

Can you post some photos please.whats your final cofg?thanks.
Old 01-28-2009, 07:36 AM
  #447  
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Default RE: 157" Discus Glider

Have you built it yet?Whats it fly like?
Old 01-28-2009, 10:26 AM
  #448  
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Default RE: 157" Discus Glider


ORIGINAL: bladerunner1

Can you post some photos please.whats your final cofg?thanks.
I haven't had a chance to fine tune it yet. Photos? Looks just like the pic on the box!! Just what photos do you want?
Old 01-28-2009, 01:32 PM
  #449  
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Default RE: 157" Discus Glider

Congrats on your new bird, Dean. Mine made it through all of last summer no problem, even surviving a fall off the top shelf in my trailer. I even started doing some loops with it at the last fly-in. I'm looking forward to more big a glider flying this summer.
Old 01-29-2009, 04:19 AM
  #450  
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Default RE: 157" Discus Glider

Sorry i meant video!

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