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Jan 26, 2013, 02:57 PM
Technomancer
valiantGLX's Avatar

Prototype


My plans wen together surprisingly well, it ended up being 10g with hinges. Instead of using 2mm depron I went with a combination of 3 and 6mm, the theory behind it is I dont need carbon fiber supports (saves a bit of cash, makes the build easier and creates a good step for the KFm2).

Glide tests without electronics went really well too. Cg sits about 40% of the chord.

Here's some more pics:

Mock up with the spitfire prop and spinner


Compared to the UM mustang


Tail hinges, the bottom one helps to brace the gap for the horizontal stab to slide in. Also the tail is the only part that doesnt follow the scale lines ( I used P51 D schematics to get the lines), I extended it by about 6mm to help with knife edges


Unglued, but hinged weight. I still need to round the edges so that will shave a bit of weight off too.
Last edited by valiantGLX; Jan 26, 2013 at 03:08 PM.
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Jan 26, 2013, 02:58 PM
Power Wheels Guru
UNGN's Avatar
Quote:
Originally Posted by pmpjohn
Under what catagory did you find the servo adapters on HK ? I am not having any luck.

Dr John
Wires and Plugs
Jan 26, 2013, 03:01 PM
Technomancer
valiantGLX's Avatar
^ Yep that one :P You guys better leave me some though
Jan 26, 2013, 03:42 PM
Registered User
Quote:
Originally Posted by pmpjohn
Under what catagory did you find the servo adapters on HK ?
I'll trade you this link at HK for your link at sparkfun!

The 1.7g servo connector is 1.25mm spacing Molex while Spektrum is 1.0mm JST-SH.

Pay attention to the plug polarity - servo is YRB, while Spektrum is BRY.


Gene K
Jan 26, 2013, 05:21 PM
Registered User
numanair's Avatar
Quote:
Originally Posted by speedy01
I'll trade you this link at HK for your link at sparkfun!

The 1.7g servo connector is 1.25mm spacing Molex while Spektrum is 1.0mm JST-SH.

Pay attention to the plug polarity - servo is YRB, while Spektrum is BRY.


Gene K
It was this: https://www.sparkfun.com/products/11034 but it says retired now.
https://www.sparkfun.com/products/10358 This one is not as cheap, but is still available.
Jan 26, 2013, 08:33 PM
RC Connectors dot com
glenn2626's Avatar
I've got all four major servo types including adapters from anything to anything at RC-Connectors.com

Glenn
RC-Connectors.com
Latest blog entry: Lower shipping prices!
Jan 26, 2013, 11:29 PM
Technomancer
valiantGLX's Avatar
Quote:
Originally Posted by glenn2626
I've got all four major servo types including adapters from anything to anything at RC-Connectors.com

Glenn
RC-Connectors.com
Certainly a one stop shop in regards to rc connectors, but a bit on the pricy side. I can see the appeal though, great for people that dont want to get their hands dirty soldering
Last edited by valiantGLX; Jan 27, 2013 at 01:33 AM.
Jan 27, 2013, 03:56 PM
Registered User
Bill Quantock's Avatar

AR6400 deploys one aileron


Been a while since I've posted here but once again, I need some help.
Dug out my scratch built Sparrowhawk, plugged in the battery and the left aileron immediately went to full down. Eliminated the servo and the extension as culprits, so I'm back to the AR6400. Is there any troubleshooting sequence to follow or is it best to simply replace the AR6400?
Jan 27, 2013, 04:02 PM
Technomancer
valiantGLX's Avatar
Quote:
Originally Posted by Bill Quantock
Been a while since I've posted here but once again, I need some help.
Dug out my scratch built Sparrowhawk, plugged in the battery and the left aileron immediately went to full down. Eliminated the servo and the extension as culprits, so I'm back to the AR6400. Is there any troubleshooting sequence to follow or is it best to simply replace the AR6400?
Sounds like you are using 2 aileron servos? Maybe you need to reprogram the brick (see user guide), or setup dual ailerons on you transmitter, because the aileron in question may be currently acting as a flap.
Jan 27, 2013, 04:14 PM
Technomancer
valiantGLX's Avatar

Progress


Here's a quick update:

Coming together nicely. GOT THROW? I have the AS3X programming card on it way so I can dial it back a bit so it works properly with the huge control surfaces


Window and faux CF


Motor mount loose test fit.


Offset prop


Servo holes cut out of the KFm2, also top mounted them so they dont get damaged belly landing.


Braced elevator with a skinny piece of piano wire.
Last edited by valiantGLX; Jan 27, 2013 at 04:20 PM.
Jan 27, 2013, 06:24 PM
Registered User
Bill Quantock's Avatar

Thanks!


Quote:
Originally Posted by valiantGLX
Sounds like you are using 2 aileron servos? Maybe you need to reprogram the brick (see user guide), or setup dual ailerons on you transmitter, because the aileron in question may be currently acting as a flap.
Valiant,
Good call! I haven't used the model for nearly a year and since then, someone stole the tx that had my Sparrowhawk settings. I forgot I'd programmed the 6400 for dual ailerons. Five minutes with the model and the tx and everything's working fine!
Thanks! BTW, there's a video of the model you saved back on p 139, post 2071 of this thread.
Your Mustang looks so good I may try a profile!
Last edited by Bill Quantock; Jan 27, 2013 at 06:33 PM.
Jan 27, 2013, 07:01 PM
Registered User
dbacon's Avatar
I am sorry for your loss, I hope everybody is looking for it. Keep your Rx on, it may start receiving it some day!
Jan 28, 2013, 02:31 AM
Technomancer
valiantGLX's Avatar
Quote:
Originally Posted by Bill Quantock
Valiant,
Good call! I haven't used the model for nearly a year and since then, someone stole the tx that had my Sparrowhawk settings. I forgot I'd programmed the 6400 for dual ailerons. Five minutes with the model and the tx and everything's working fine!
Thanks! BTW, there's a video of the model you saved back on p 139, post 2071 of this thread.
Your Mustang looks so good I may try a profile!
Quote:
Originally Posted by Bill Quantock
Im glad I could help Your Sparrowhawk is such a beautiful flyer too, shame on you for not flying the poor girl in over a year

Quote:
Originally Posted by Bill Quantock
Your Mustang looks so good I may try a profile!
Thanks I have never been a fan of profile planes, and I thought that people who built them were just too lazy to design full fuse planes, but I am begging to see the benefits of the profile design:
  • Quick and simple to design, build and repair.
  • Ultra light weight.
  • Fuse works as a massive side force generator, good for knife edges.
  • KFm2 without dihedral creates adequate lift + stability at speed and is great for flying inverted.

My mustang will be my entry into the world of 3D flying, that is if my 1s BL + gearbox combo works well.
Jan 28, 2013, 03:35 AM
Technomancer
valiantGLX's Avatar

Mounting the brick


Where do you guys think I should mount the brick. Note that I have a programming card so it doesnt matter whether I mount it horizontally or vertically.

If I mount it here the weight will be more evenly distributed, and I can mount the battery on the rear half of the fuse to get a good CG. However control linkages will be longer meaning more weight.



If I mount it here I'd need to have both control horns on the same side, which may disturb the balancing, but I guess I could counter it with the battery on the other side. For a pro linkages will be shorter, but a con is thats where I wanted to put my Spektrum sticker.
Jan 28, 2013, 06:19 AM
Registered User
valiant,

Those great little servos now come in white!!

Gene K


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