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This is my second attempt at an electric Funtana and my fourth Funtana model in all. My current IC version has not got of the ground due engine problems and lack of interest. Model
is made from parts from a few models plus rebuilt front
end, it has a very upgraded wing (see photo) with diagonal
bracing ribs and vertical braces to the ribs having been
added to overcome flutter problems of previous models.
Ailerons servos upgraded from JR 811’s to Hitec
649MG’s this seems to have cured all flutter problems. Undercarriage has been upgraded to a composite carbon type to give greater ground clearance for prop. The original plan had been to use 20 cells (10S2P), an initial 5 minute test flight was flown with a 10S1P, this proved more than adequate power and on recharging only 1.4 amp/hrs was needed to charge the battery. I have subsequently worked up to 10-minute flights. Even approaching 10 minutes there is enough power to pull vertically out of hovering flight, with about .4-.5 of an amp/hr left in the batteries. Using
only 2 battery packs instead of 4 has saved 20% in weight,
which accounts for he models performance. I choose the
Hyperion Litestorm 3700 5S1P because 4 packs would fit
nicely between the bulkheads just behind the wing joiner. The
cowl has only the air inlets as supplied but I opened up
the holes in the front bulkhead and put light ply around
the battery bay, with vents in the bottom of the fuselage
none of the electric bits get more than warm during a ten
minute flight. I will probably upgrade the servos further to the same as used on my IC Showtime JR 8411’s on ailerons and rudder with JR 8231’s on elevator. Also I must make the top decking quicker to remove and replace to make the batteries more accessible. Model has now had over a dozen flights without incident and am working up to complete my BMFA Achievement scheme “C" certificate with it in the not to distant future. |
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Gloucester Model Flying Club |
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