T E A M
I have already been toying with building a smaller version of my already shrunken Electric Buttercup. I came across 2 mini outrunner brushless motors which reinforce my idea. However, I hesitate to build any size near 30" wingspan as it'll not be any significant reduction in size. Brushless motors themselves are very powerful for thier size and those available models are not feasible to build a really small model.
Then, I remembered I came across the GWS EDP-50XC (direct drive IPS motor) set at Rotor hobby and also later found the GWS ESC100Li sitting in JH. Plus that I already own a micro size Blue Arrow Rx and some AT-33 sub-micro servos. All these spell the perfect recipe for a micro Buttercup.
So I redrew the plans which the wingspan tipped at 20.75". Some structural members are omitted from the original plans since the model this size would have sufficient strength to go without them. The entire model is built mainly from 3/32" balsa sticks with some 1/32",1/20" and 1/16" balsa here and there. The firewall and bulkhead is made up from 1/64" plywood faced with 1/16" balsa sheet. The model is covered with Coverite CoverLite, which is equivalant to Litespan from Solarfilm. The covering does not have its own adhesive and the balsa frame has to be painted with Coverite Balsarite on edges where the covering is supposed to stick on the frame. To save space and weight, the motor and ESC wires are shortened by cutting away the excess and resoldered to each other.
I originally planned to use my TP 2S 350mah pack but quickly found out that it will not quite fit into the cramp fuselage. I bought some 185mah single Lipo cells from JH and soldered them into 2 sets of 2S packs, which fit very nicely under the wing. Although flight duration is compromised, the little motor only draw under 2 amps and this packs should supply at least 5-6 minutes of flight time. Pretty comfortable.
These are the vital specs;
Wingspan : 20.75"
Wingarea : ~ 74sqin
AUW : 4oz
Wingloading : ~ 7.78oz/sqft
Motor : GWEDP-50XC
Prop : GWS 3x2
ESC : GWESC-100Li
Battery : 2S 185mah Lipo
Rx : Blue Arrow R3P5
Servo : AT-33 (02off)
Then, I remembered I came across the GWS EDP-50XC (direct drive IPS motor) set at Rotor hobby and also later found the GWS ESC100Li sitting in JH. Plus that I already own a micro size Blue Arrow Rx and some AT-33 sub-micro servos. All these spell the perfect recipe for a micro Buttercup.
So I redrew the plans which the wingspan tipped at 20.75". Some structural members are omitted from the original plans since the model this size would have sufficient strength to go without them. The entire model is built mainly from 3/32" balsa sticks with some 1/32",1/20" and 1/16" balsa here and there. The firewall and bulkhead is made up from 1/64" plywood faced with 1/16" balsa sheet. The model is covered with Coverite CoverLite, which is equivalant to Litespan from Solarfilm. The covering does not have its own adhesive and the balsa frame has to be painted with Coverite Balsarite on edges where the covering is supposed to stick on the frame. To save space and weight, the motor and ESC wires are shortened by cutting away the excess and resoldered to each other.
I originally planned to use my TP 2S 350mah pack but quickly found out that it will not quite fit into the cramp fuselage. I bought some 185mah single Lipo cells from JH and soldered them into 2 sets of 2S packs, which fit very nicely under the wing. Although flight duration is compromised, the little motor only draw under 2 amps and this packs should supply at least 5-6 minutes of flight time. Pretty comfortable.
These are the vital specs;
Wingspan : 20.75"
Wingarea : ~ 74sqin
AUW : 4oz
Wingloading : ~ 7.78oz/sqft
Motor : GWEDP-50XC
Prop : GWS 3x2
ESC : GWESC-100Li
Battery : 2S 185mah Lipo
Rx : Blue Arrow R3P5
Servo : AT-33 (02off)
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