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Aug 19, 2007, 06:57 AM
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6" F-18 hornet


Hi,

A year ago I was experimenting with a 6" F-18 Hornet, but I abandoned that project because I had some range problems with my IR setup. Now that I've been enhancing my IR setup, I took up that project again and made a new 6" F18 Hornet with some lessons learned from my previous experiments.

Here are some specs:
  • Koichi IR rx (diff. thrust)
  • selitac wings
  • durabatics vertical stabs
  • 5mm wallfoam core fuse and 2mm wallfoam side panels
  • PiccoZ props
  • 4mm 18 Ohm pagers
  • 50mAh LiPo
  • acryl paint
  • Tissue with yellow color from inkjet
  • 5.5 grams
  • 6" wingspan

I tested it at dusk - because there was almost no wind - and it seems to fly. I can steer left and right and it keeps aloft at a bit more then 1/2 throttle. I have to steer it very gently though, as it can easily get into a spiral. However, I have the impression that it is rather stable in flight. Real tests will be conducted once the indoor season starts again in October ;-)

For trimming I put both motors at the same distance from the fuse. Both motors induce a drift to the right. So I let the prop at the right point down and the prop at the left point up. This will cause a upward thrust vector at the right side and a vertical downward thrust at the left side. This seems to be sufficient to compensate for the motor torque...

Some pictures below.

regards,
Johan
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Aug 19, 2007, 02:20 PM
Nice work Johan! Only 2 more months till october! Can't wait!
Aug 19, 2007, 02:42 PM
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village_idiot's Avatar
Why did you choose the 18 ohm motors? Do they provide more thrust than the 10 ohm motors?
Aug 19, 2007, 05:09 PM
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yrn1: Long time to wait ;-)

Village_idiot: That is what I had lying in my drawers... I would guess that the 'hotter' 10 Ohm wind would give more power...

Johan
Aug 19, 2007, 05:31 PM
Inciting Riots
village_idiot's Avatar
Good, that is what I was hoping when I ordered them the other night.

BTW, I ordered some upgraded tail props for the ITC Micro Mosquito, they look very much like the PiccooZ props, but you can actually buy them as a part (not cheap though). Once they get in and I have a chance to try them, a review will show up in here https://www.rcgroups.com/forums/showthread.php?t=728851 or in a separate thread.
Aug 19, 2007, 09:52 PM
Mach 2 with hair on fire!
TeraHurtz's Avatar
Dude, nice work! Try this one in that scale.
F-4, 10 in long, 7 in wing span. AUW 14.6 g. Differental thrust.


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