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Old Feb 23, 2010, 09:44 PM
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it takes a second or two of sustained failsafe servo positions before the OSD will engage RTH mode... the DL was only in failsafe for less than a second. If it was a sustained failsafe it would have engaged...

with the LRS or dragon link, I remove the 72mhz module from the back of my futaba 9c and connect a few wires from the dragon link transmitter box to the pins that go on the module (power, ground, PPM, and a few other pins to fool the 9C into thinking it has a module connected). I just ziptied the tx module to the back of my transmitter.

once you do this, the 9c operates exactly like it did before will all the mixing functions. There are 2 things that are quite different though...

1. The failsafes are not programmed through the 9c anymore. you set ther servo positions to the failsafe position and then hit a button on the Tx module.

2. my futaba 9c can only output 8 channels in PPM mode. 9 channels are only possible in PCM mode, which is not compatible with the dragon link (or LRS). this is a Tx limitation of the futaba and other transmitters may not have this issue.

if I ever wanted to go back to 72mhz, I can just cut the ziptie, unplug the DL module and plug in the 72mhz module again. not that I am likely to do that anytime soon!




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Old Feb 24, 2010, 12:00 AM
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Got it! Thanks. Would sure be nice if they could make it just "fit" in like the other modules, but oh, well. Does the UHF then broadcast/transmit through your 9C's antenna? I would think it wouldn't be "long enough" for the typical half wave optimal length. Sorry for all the stupid questions.
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Old Feb 24, 2010, 02:10 AM
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there are just too many different radios for them to make a special module for each one...

the DL module has its own antenna sticking out the top. Its shorter than the normal 72mhz antenna due to its shorter wavelength...
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Old Feb 24, 2010, 07:51 AM
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Quote:
Originally Posted by downeym View Post
there are just too many different radios for them to make a special module for each one...

the DL module has its own antenna sticking out the top. Its shorter than the normal 72mhz antenna due to its longer wavelength...
Yeah, that figures on the module. Hum, they must be going with a quarter or 1/8th wave then, because longer wavelength normally takes LONGER antenna.

-JM
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Old Feb 24, 2010, 08:05 AM
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its a shorter wavelength... If I remember correctly there is a half wave whip on the Tx...

72mhz = 164in
433mhz = 27in
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Old Feb 24, 2010, 08:26 AM
FPV Desert Beta Test Center
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Do you have a video by a 2nd person showing you launching the wing?
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Old Feb 24, 2010, 08:45 AM
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sorry.. no video, but a few pictures...
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Old Feb 24, 2010, 08:47 AM
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Thanks! Are you throwing it power off?
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Old Feb 24, 2010, 08:47 AM
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Quote:
Originally Posted by downeym View Post
its a shorter wavelength... If I remember correctly there is a half wave whip on the Tx...

72mhz = 164in
433mhz = 27in
OK. For some reason I had it in my head that it was even lower frequency than 72MHz (like 433Khz or something????). Mostly, I was going with the attenuation of 2.5GHz over 72MHz and thinking in my head UHF was going further.
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Old Feb 24, 2010, 08:55 AM
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the advantage of the UHF recievers is a cleaner frequency range, frequency hopping, and a good RF front end on the receivers...

definately throw it power off! launching it not really any different than my 48" wings... just a stronger throw since it weighs twice as much... once you throw it it has a nice glide and plenty of time to power up and climb out...
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Old Feb 25, 2010, 07:14 AM
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Quote:
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Thanks! Are you throwing it power off?
Yes, they get thrown power off if your over-handing it like in the pics. As soon as its gliding, apply full power and off it goes. The wings are so streamlined that they glide very well on launch.

I dread the day that I accidentally hit the throttle with my hand back there
I hope it never happens
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Old Feb 25, 2010, 07:24 AM
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Have you seen the way Dave Powers launches his planes? Holding it in the wingtip, do a 360 spin and relese with power on
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Old Feb 25, 2010, 07:35 AM
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Have you seen the way Dave Powers launches his planes? Holding it in the wingtip, do a 360 spin and relese with power on
yep, thats how I launch my swift, kinda like a frisbee toss. I havent tried with the Zephyr yet though...
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Old Feb 25, 2010, 10:04 AM
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Goodluck doing that with a 3 part wing. You'll be flying a little lopsided I bet.
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Old Feb 25, 2010, 10:11 AM
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definitely.... not to mention that you would have to secure the outer sections pretty well to be swinging a 100" wing around by the tip...

I have done the wingtip toss and the pizza toss, but I vastly prefer the method I showed in pictures... much more stable glide after and more time to get on the sticks...
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