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Old Feb 05, 2011, 08:40 PM
recep
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Ankara, TURKEY
Joined Sep 2005
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Modified HobbyKing epp fpv plane

Hi . I have modified hobbykings epp fpv plane. Two things were in mind a lighter and a modular plane that can fit in its box with the fpv equipments.
Auw with go pro pantilt with rcv 922 cam is 1490 g
Auw with kx 191h pantilt is 1380 g
I must give credit to Graham McAllisters sky hawk as my source of inspration for this type of design
http://www.mcallisterdesigns.com/skyhawk.htm
I'm also builing a full house balsa version of the same concept.
http://www.rcgroups.com/forums/showthread.php?t=1270511
Modified epp fpv plane (1 min 45 sec)
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Last edited by recep; Feb 05, 2011 at 09:47 PM.
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Old Feb 05, 2011, 08:48 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
I started with the spars and joiner system. I think carbon tubes can take a lot of abuse from outside but as it comes to forces from in side it fails with a slight abuse so I changed the whole spar and joiner system with 8mm carbon tube and brass tube . It look ok even with a slight flex on the wings. it has been tested with loops and rolls.
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Old Feb 05, 2011, 08:55 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
I didnt use the original boom it sure looks strong but I used two identical fishing rods for modular boom. It has got two pieces one in fuselage and the other one that slides over. I epoxied carbon line to the tip in order to deal with the forces mentioned in the previous post. I used zap a dap a goo and ca in this part of the build.
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Old Feb 05, 2011, 08:57 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
Stabs are most modular part of the plane.
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Old Feb 05, 2011, 08:59 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
As the servos are on the stabs I need some wiring along the boom.
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Old Feb 05, 2011, 09:02 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
Servo placement. Md 933 digitals for flaperons and elevator hs 55 for the rudder.
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Old Feb 05, 2011, 09:05 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
As you can see boom is no longer in the bottom so motor is mounted on front of the fuselage. I cut unnecessary parts.
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Old Feb 05, 2011, 09:08 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
There wasnt a suitable place for the motor then I did a cosmetic surgery to the model like the new face
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Last edited by recep; Feb 05, 2011 at 09:40 PM.
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Old Feb 05, 2011, 09:11 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
I also didnt use the rubber bands for keeping the wing in place instead I used M6 plastic bolts and nuts.
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Old Feb 05, 2011, 09:14 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
Here is the process. All is done with ca.
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Old Feb 05, 2011, 09:14 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
Mess inside
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Old Feb 05, 2011, 09:16 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
Video tx will need a good airflow.
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Old Feb 05, 2011, 09:25 PM
recep
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Ankara, TURKEY
Joined Sep 2005
490 Posts
Some specs from the model
Motor turnigy 35-30B 1400 kv
Esc himodel fly series 40 a opto
Ubec turnigy 5a
lipo 2200 3s
FPV equipment
Bev rc 1.3 800mw tx rx combo X 2 with oracle
750 mah lipo battery
GP patch (in the future)
And one strange thing about the noise I got in the video
I set every thing up moved the throttle stick and saw some noise increasing with more throttle. Thought esc problem then I changed the antenna with another identical one, that was it, no noise. Now here is the problem of the four identical antennas only one gives noise free video. It looks like a vibration issue but what could be wrong with these antennas.
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Last edited by recep; Feb 05, 2011 at 09:37 PM.
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Old Feb 05, 2011, 10:06 PM
It just keeps getting better!
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Eureka, CA
Joined Oct 2002
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Bravo!
A nice improvement over the original.
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Old Feb 05, 2011, 11:11 PM
Oopss. Oh well.
borneobear's Avatar
In the tropics
Joined Jan 2006
3,623 Posts
Nicely done! Good tips from your build.
Congrats.


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