Comments

• 

  John September 22, 2014 at 2:36pm

  

  Can I use the identical parts for the elevators and rudder? 
• 

  John September 22, 2014 at 2:34pm

  Well, we have a 750g payload of FPV equipment, AT, antennas, cables... without the batteries. And we want the longest flight duration. so, I guess I need the extension wing.

  How many Cells should I have to get the best? If I put 2 x 3S 9000mAh in parallel, will it it be OK? or I should go for the 6S by putting them in series ?

  What motors, prop are you using? 
  
  I have 3 tail wings part from a previous plane, ( attached) do you think they will work? Standard Tail parts
• Scott Pritchett September 22, 2014 at 1:39pm

  I now have wing extensions on the black one.  It is slightly more efficient at low speeds, but not as nice to fly with them.  Frankly I recommend it without the extensions unless you're trying to carry 20000mAH of battery of something.

  The standard wing easily carries 12000mAH of 4S batteries and hand-launches just fine.

  I've posted a lot of info about them over on the rcgroups thread: http://www.rcgroups.com/forums/showthread.php?t=1977612

  That includes building info, vibration-damping motor mounts, equipment etc.

  The main benefits are:

  1. It flies better with less "hunting".  Loops and rolls track straight and true.

  2. Since I fly from a grassy hill-top, the skeg on the bottom of the v-tail is a terrible feature for landing and takes a beating in that situation. The standard tail doesn't have that problem.

  3. It's slightly more efficient because the skeg in the stock config is very thick at the base.

  I just used a hot-wire cutter to make the vertical stabilizers from foam.  The top-rear of the fuselage is very thick and strong with plenty of material to attach to.  I embed short pieces of CF rod into the stabilizer and drill holes for them in the fuselage, then epoxy the whole thing together.

  I'm not interested in making them to sell.
• 

  John September 22, 2014 at 1:29pm

  @scott
  
  They look awesome. You are not using the wing extension, are you? What are the benefits the standard tail gives comparing to the vtail?
  
  Can you share with us how you did them? Are you willing to sell one of them?
• Scott Pritchett September 22, 2014 at 1:23pm

  I've built two with conventional tails.

  The black one has an APM and around 3000 miles of flight on it.

  The white one has a pixhawk and about 500 miles so far.
• 

  John September 22, 2014 at 10:28am

  @Scott Pritchett

  Can you please post some photos of the conventional tail for the Talon that you did?
• 

  John September 18, 2014 at 6:30am

  This is great that we can save precious weights.

  I will order few to test.
• Tim Wilkin September 18, 2014 at 5:54am

  Hobbyking weights always include packaging, so that the shipping weight (and hence shipping cost) are accurately calculated. My 4S 5000 lists as 1 gram lighter than the 4S 6600 Multistar, so battery weight will be almost identical.

  Indeed, that's the whole point of the Multistars... to deliver a higher energy density at the same weight as the higher C rating batteries. They're all 10C batteries though, but that isn't a problem. On a 6600 mAh battery (6.6 amp hours), 10C is 66 amps... I need about 1/10th of that... i.e., most flight situations are around 1C. Full power climb on my mini is still sub 15 amps, so less than 3C. A 10C battery is more than I need... and indeed, at the capacity levels we want for endurance UAVs, 10C is more than most of us need.
• 

  John September 18, 2014 at 5:21am

  @Tim: I was reading regarding the Multistar battery that they are made for the copters. 
  
  Features:
  • Ultra high capacity LiPoly batteries designed specifically for multi-rotor use.
  
  Specs:
  Minimum Capacity: 4000mAh
  Configuration: 3S1P / 11.1V / 3Cell
  Constant Discharge: 10C
  Peak Discharge (10sec): 20C
  Pack Weight: 244g
  

  Will the 10C work better with our fixed wings?
  
  

  If yes, then we are saving at least 20%. From 80 for each 3S 1Ah to 61g. 
  
  I saw on the HK website under each battery details those info :
  

  3S 3000 = 195 g => 65g for every 1000 mAh

  3S 4000 = 244g => 61g for every 1000mAh

  3S 5200 = 325g => 62.5g for every 1000 mAh
  
  

  But on the Title in the product list, the weight is different. For the 3S 4000 the weight is 331g instead of 244g
  
  We have to check with them about it. 
• 

  John September 18, 2014 at 4:01am

  Well, we have multiple antennas:
  
  1- vTX antenna: the mushroom 1.2 Ghz
  2- Telemetry modem 1W with dipole Antenna 900 MHz 

  3- Scherrer rx with the 2 dipole antenna. 433 MHz
  
  And I guess most of them should be 60cm away from each other, that's why I guess we have to use one the wings to install the vtx and antenna and the other wing we will install the telemetry modem. 
  
  Unless if there are other better options...