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Silver182 -> RE: Large electric warbirds 60 size plus,,,lets see em (7/6/2008 2:43 AM)
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I have converted the World Models P-47 ARF to Electric power. I get 10 minute plus flights; its performance level is very similar to want it would be with a strong 120 / 140 4-cycle motor...but no oil to clean up after each flight! I've been cleaning oil off planes for over 40 years and I'm tired of it.
The only modifications I made to the World Model version ARF kit was to cut out fabricate & re-enforce a nose top hatch. I also added a couple of washers under the retractable landing gear mounting brackets at the rear of each to cause the main wheels when down & locked to be farther forward. This puts a bit more needed weight on the tail wheel for better crosswind taxiing, and makes wheel landings a breeze. In fact the tail weight is so light on this version of P-47 a bean bag draped across the rear of the fuse is needed when the wind is above 8 mph. All up flying weight is about 13lbs. Warbirds like to be nose heavy, makes for better handling during landings.
I entered my P-47 in the Warbird over Denver contest held a couple of weeks ago and won a second place trophy, not bad first time out.
The motor I picked was the E-flite 110 / using either a Master Airscrew 16X8 three blade prop or a two blade APC 17X8 prop. I fabricated a series / parallel bus bar out of dean’s plugs. Six 11.1 2500ma high C Lipo's three in series then each set of three paralleled to provide 5000ma @ about 34 volts. Happens to be just enough space just behind the firewall accessible through my top hatch for all six batteries & buss bar. I remove all six batteries after each flight charge each one separately & simultaneously using two four output Great Planes PolyCharge4 LiPo Chargers. I decided to go the bus bar route so I could use the 11.1-volt batteries on smaller electrics that I already have been flying for years. The two 4 output chargers are perfect, all you need is good strong charging source battery, and possibly a second set of 6 Lipo's and you can fly as many flights in a day as you want.
At the last minute before the Warbird Rally, I purchased the AeroSound unit programmed for the P-47 sound. I installed it with two 4-inch speakers in the cowling, it works great..Engine startup sound is very real, but I would like to have it be louder while flying! I e-mailed Axel the creator of the Sound system; he says all that is needed to make louder sound are more & larger speakers. I tested his advise on one 14 inch large magnet speaker in my shop, and he's correct that sound was Os-umm it shook the windows in my shop!! I drove that large speaker with his low voltage 40w amp. directly wired. Anyway the sound with the two 4 inch speakers is good as long as there is no other nitro or gas models flying at the same time.
Lee H. DeMary
AMA 36099
Wavier # 8000
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