Jolly J3 Modifications - RC Groups
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Mar 22, 2011, 01:34 AM
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Jolly J3 Modifications

If you're following along my incoherent ramblings you may have noticed that I've got a HobbyKing "J3 (Green)", which is really an L-4, and have outfitted it with some gear that would make for an edgy speed-machine in a plane perhaps half the size. Propping properly has, therefore, been an issue.

Today I swapped out the cut-down 8x3.8 for a proper TGS 6x4 propellor, and running times are now around the 5 minute mark with reserve left in the battery - that is hard flying in the wind, too, so calm weather would most likely see 6 minute flying times or possibly more. Its running on Turnigy 2s 800mAh 20C packs and ordered some Rhino 2s 750mAh 20C's which arrived today. Both are good, reasonably priced packs that perform well.

I've ordered a 1500kv motor to replace the 3000kv unit that it is currently running. Hopefully this will be a bit more efficient and provide some longer running times. If not, no worries, I've got plans for the 3000kv unit anyway.

Essentially it'll be used in a 24" mini-hotliner, or speed stick. Currently the fuselage is made out of an 18" length of 8mm aluminum tubing, the wing from 4mm balsa, and the tail assembly from 2.5mm balsa... all held together with epoxy. The components are as follows:

Rhino 3s 610mAh 20C / 2s 750mAh 20C
Hextronik 24g 3000kv motor
TGS 4.75x4.75 prop
HK SS 15/18A ESC
HXT500 servos

Pretty basic, but should be light and powerful enough to be a bit of a rocketship... for the size at least. Pitch speed for the prop is around the 100mph mark on 3s (11.1v/15A) and something like 70mph on 2s (7.4v/16A). All powering a plane that will (hopefully) weigh under 200g/8oz... interesting!

More as it comes, pictures of the hangar and construction project next post.

Cheers - boingk
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