From my 2014 notes.

WORLD MODELS ULTIMATE 40

Wing (top) 42”.

Length: 39.5 inches

578 Sq inch

Wing loading is 19.95 oz per sq foot at 5lbs AUW.

(wing area divided by 144 = 4.01 … then weight divided by that number)

Wing CUBE loading is 10 (http://www.ef-uk.net/data/wcl.htm)

AUW weight recommended is 4.5 to 5 lbs.

My AUW weight is 80ozs or 5lbs.

Watts per pound at WOT is 129 (at 5lbs) with motor putting out 644 watts (46A) with 12x6 APC E prop.

Wind speed limit with MY plane = 32kmh or 20 mph – Optimum is 15kmh or 9mph.



ACCORDING TO “KMP647” (http://www.rcgroups.com/forums/showt...odels+ultimate+ )

142 WATTS PER POUND GIVES HIM UNLIMITED VERTICAL WITH HIS 14X10 PROP!

ACCORDING TO THE HACKER / DP ULTIMATE VIDEO 120 WATTS PER POUND (900w / 7.5lbs @ 45A X 20V GIVES AMAZING SPEED AND VERTICAL PERFORMANCE WITH ITS 15X10 PROP!

Plane without battery, power plant, receiver or servos. (just kit weight) = 43 ozs

The following is its kit weights:
Cowl: 2.1oz (Lighter because of hatch I cut out)
Vertical feathers: 1.2oz
Canopy: 1oz
Pants: 1oz
Horizontal feathers: 1.9oz
Fuse: 9.1oz
Top wing: 7oz
Bottom wing: 7.2oz
Hardware including 2.25” spinner and 2.5” wheels: 10.1oz (BTW, Scott suggests 2.5” wheels as opposed to the 2” stock for bumpy fields)

TOTAL KIT WEIGHT = 40.15oz

Plus the following components:

HYP 4020-10 (60A/70A peak - 5 cell max) and prop adapter and bullet connectors: 10ozs

COMPLETE Back Motor mount: (with their backplate and bolts, my bolts and PVC pipe etc) 3.75 ozs

ESC: (80A Opto) 1.75 ozs

Prop: 12x6 APC – .75oz

4S 4200 Polyquest 16-20C battery: 13.85 ozs (Includes Sermos connectors for battery: .25ozs)

Receiver: .6 oz

UBEC: .7 oz

Switch: .5 oz

3 HS225MG servos: 3.75ozs

Misc: (Glue, Battery tray mods etc) 4.2ozs

TOTAL COMPONENT WEIGHT = 39.85 oz

TOTAL ALL UP = 80oz (5lbs)

(Greg Covey’s is 5lb 10ozs/90 ozs with 20oz battery PLUS extras like switch, DPM module etc)





TIPS!

Tip on landing gear.

Knock out the blindnuts and put in nuts that fit nylon bolts. That's about 20 minutes of work that'll be well worth it. The gear is on a plate that has no structure behind it to support a hard hit. So the hit tears out the wood. With nylon bolts, it pops the heads off and you screw in new ones. I used 10-24 nylon bolts as an experiment.

================================================== ===============================



Power produced:

PROP FOR 47A (70% OF BATTERY’S RATING) FOR FIRST 10 FLIGHTS!

With 12x6 prop = 646 watts at 47 amps and 13.75 volts. (16C - 4S pack @13.75 ounces)

Since THIS plane is 80 ounces, the watts per pound is 129

ULTIMATE’S flying time with 4S 4200mah (16C) pack at 47amp draw.

(13.75V @ 47A = 646W = 129w per pound @ 11.19C WOT discharge rate.)

Motor amp draw is 47 amps or 47,000 mah.

UBEC amp draw is 3 amps or 3,000 mah

50,000 mah divided by 60 minutes is 833

Battery capacity of 4200 mah divided by 833 = 5.04 minutes flying time at full throttle.

Since I fly at 65% of the time at full throttle my flight time should be 5.04 minutes divided by 65% = 7.75 minutes (In reality I got 8 minute flights at this amp draw)