Nothing against Bearospace Industries, but I am trying to figure out if I should buy the kit or not and modify where I see fit as they say on the website. 

So I used Ecalc and it gives an error for max motor due to current being too high and 10 minutes of mixed flight.

So how does Spike get 3hours of zero payload flight? What am I missing? Is it an error in Ecalc? 

It is confusing please advise.

Specs from Spike:

WINGSPAN:  3200MM   126 INCHES

WING ASPECT RATIO: 10.77 / 1

​AIRFOIL: HIGH LIFT / NON CRITICAL TYPE  MAX CO-EFFECIENT OF LIFT: 1.5

WING AREA:  96,000 CM SQ.  OR 1488 INCHES SQ.

AIRFRAME STRUCTURE APPROX WEIGHT:  4 LBS, 9 OZ

EMPTY WEIGHT: 7 LBS

MINIMUM FLYING WEIGHT:  15 LBS / 6.8 KILOS

MAXIMUM GROSS WEIGHT RECOMMENDED:  20.75 LBS / 9.4 KILOS

WING LOADING:  23-32 OZ. -SQ. FT   -   71-98 SQ. D.M.

FLIGHT DURATION : APPROX. 3 HRS WITH PAYLOAD

RANGE: AT LEAST 12 KM DISTANCE WITH L.R.S. 

DISTANCE:  APPROX 120 KM LINEAR WITH PAYLOAD

CRUISING SPEED:  40-70 KM PER HR

STALL SPEED AT MAX GROSS WEIGHT:  22 MPH / 35.4 KM PER HR

CIELING: UNKNOWN, BUT VERY HIGH. 20,000FT +

BEST LOITER SPEED:  42 KM PER HR

BATTERY CAPACITY 50,000MAH 3 CELL LITHIUM POLYMER

AMP DRAW AT 42 KM PER HR:   13 -17 AMPS DEPENDING ON PAYLOAD/BATT.

RECOMMENDED POWER:  2X E-FLITE POWER 15 BRUSHLESS ELECTRIC 

RECOMMENDED PROPS: 13.5 X 8 APC THIN ELECTRIC 2 BLADE 

RECOMMENDED PROP CONFIGURATION: COUNTER/ROTATING INWARDS

RECOMMENDED SPEED CONTROLLERS: PHOENIX EDGE 50 AMP +

RECOMMENDED SERVOS:  HS 225 METAL GEAR TYPE FROM HITEC

FLAPS:  DUE TO HIGH LIFT AIRFOIL, NONE ARE NEEDED

FEATURES:

~2 SWAPPABLE PAYLOAD BAYS, 1 LARGE(FOR 2 COMPACT DSLR'S) 1 SMALL FOR CANDY DROP/ OBSERVER CAM/ETC. (BOTH HAVE UNOBSTRUCTED DOWNWARD VIEW OF THE GROUND FOR MAPPING MISSIONS)

~MODULAR 6 PIECE DESIGN -  FITS IN THE TRUNK OF A SMALL CAR

~CAN BE ASSEMBLED IN THE FIELD IN ABOUT 10 MINUTES

~EASY TO FLY AND STABLE (EASIER TO FLY THAN MOST TRAINERS)

~LOW PILOT / AUTOPILOT WORK-LOAD DUE TO STABLE DESIGN

~EASY TO BUILD AND REPAIR WITH COMMON HOBBY MATERIALS

~ ROBUST DESIGN IDEAL FOR COMMERCIAL APPLICATIONS

~CAN USE HOBBY GRADE ELECTRONICS

~DESIGN IS SIMPLE, AND LENDS ITSELF TO MODIFICATIONS, AND MULTI-MISSION CONFIGURABLE PAYLOADS

~HARD POINTS ON THE WINGS ALLOW FOR UP TO 4 DIFFERENT PAYLOADS TO BE CARRIED AT THE SAME TIME

~OVERALL LAYOUT IS IDEAL FOR KEEPING SENSITIVE RECIEVERS FAR AWAY FROM THE NOISE PRODUCED BY VIDEO TRANSMITTERS.

~THE COMBINATION OF LOW COST, SIMPLE CONSTRUCTION, LONG RANGE, ENDURANCE, AND WEIGHT LIFTING POTENTIAL ARE UNBEATABLE IN THE WORLD OF SMALL UAV'S!

 

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Did you end up purchasing the Gemini? 

I wish I could take all the laser cut parts, and replicate them in CF plates... 

Seems like a time-intensive build. 

not sure about your E-calc, or how it interprets the data. I get flight time Data from real world testing. actually flying the aircraft until the battery is low, and it is time for re-charge. 

The flight time was less with lipo batteries, but with the latest generation of lithium ion batteries, it is 4+ hrs. 

Thanks for the interest, and i can assure you, i have flown over 4 hrs with an unmodified v-2 aircraft. 

i believe more is possible, because the aircraft was several pounds below gross weight at the time of the test. it is a configuration that is for utility,and carrying a payload.  also flew to 13000 ft and over 2 hrs flight time on another flight. 

Best, and let me know if anybody has any further questions.   fpvreviews@gmail.com gets me direct. 

cheers! 

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