is there an accurate chart to calculate sk-450 total weight to determine prop size with rec. motor size = lipo ratings so I can fly 20 minutes with no fpv/gps/i know total weight without motors and using a turnigy 2200 30-70 discharge 4s I don't wish to run a lipo that goes away during the first 3-4 minutes I need 80%factory specs wow accurate for 3d flying or just loitering end results can very so vastly due to manufacture ratings (egzageration) factored in 25 % would be hopeful? so being battery oversize will compensate/allow for NO FPV,CAMERA GPS LOAD,.So i'am wanting 80 at the end of flight to allow my lipos virtually no strain and keeping esc,motors ,connectors cool . Will check with temp gun as a bigger lipo to fit the bill should be easy to obtain 20-30 min flight times without any camera,fpv,gps gear CORRECT? AM I ABLE TO DOWNLOAD A ACCURATE BATTERY SIZING CHART WITH ALL SPECS. KNOWN IE.=TOTAL WEIGHT WITH BATTERY AND FOUR MOTORS IN GRAMS TO FACTOR GRAMS OF THRUST X FOUR TO FIGURE LIPO SIZE AND MOTOR AMP REQUIRMENTS PER WATT PER WEIGHT DIVIDED BY FOUR AND GETTTING THE CORRECT PROP SIZE THE FIRST TIME OR AT LEAST CLOSE 5-10% CURVE IS THIS POSSIBLE WITH KNOWN WATTS REQ PER PROP X FOUR WITH ALL FOREMENTIONED WATTS X AMPS DRAWN? tHANKS ALdon h
IM not sure 20 min is possible in an SK450. Most 450 are flying around 10min id say on average. As you add battery capacity you add weight weight and amp draw. So there are diminishing returns. The only suggestion I will make is to check out the multistar 10C batteries. When you get to these supersize batteries(5000mah ) generally 10C will provide enough current and save a lot of weight. Also the Sk frame is pretty heavy, you should be looking for a carbon frame.
Also, weight isn't the factor for determining battery C rating. You should be looking at motor peak current for that. Also consider that most motors are most effecient at ~80% of there max power. There is no such chart! every quad is different. Your best bet is to just go see what other people are doing for max flight times and start with simular equipment.
Just find a 3.17mm size shaft with a c-clip groove cut and order it. It does not mater who it is from. Make it work. I have tried to order the correct part for this motor and have never found a listing for it. the same goes fro the c-clip.
Buy some 3.17mm carbon steel rod stock and make your own, you don't even need a lathe, just a decent drill press and a fine tooth hack saw blade. Since so many motors use 3.17mm shafts, you'll get used to making your own, especially if you are crash prone.
the shaft is 3.17mm so just look in the prop adapter section for an 3.17 prop adapter
Just got this motor and put it in a guanli me-109 I had sitting on the shelf 7-4 sport prop 3s 25a.esc flew very nice and scale like not vertical but could hold a knife edge without falling for about 60' very nice little motor for the money
Screaming little motors. On a 3cell 2200, 30A ESC with 8x6 prop it was pulling 23amps and 237watts and did not over heat after 5 minutes of full throttle. I've paid 3 times as much for similar sized motors that didn't come even close to what these did. Very impressed and will buy more. 5 Stars for sure :)
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Perfect match for the EPP Combat 109. Pulls close to 20amps on an 8x5 prop..so it's pushing the limits of the ESC. But it does vertical, good speed, and good low end power. Balances well with a 1050mah battery, too.