centuryman
Senior Heliman
Location: deerriver,mn usa
| Thanks for the info rh50.I have had several conversations with a NEU rep ,a flight power rep and david from gobee on this conversation.The consenses is that as long as you stay below the 30,000 rpm limit and can gear it properley, the higher the voltage you run the more power you will have , the more effeciant it will run, (witch means the motor will stay cooler since it is drawing less amps)and the longer the run times will be.David from gohbee has done alot of testing with the 1907 8s setup in his new phazor 600 witch i have one, and he actualy bundles the phazor with that motor on 8s.
My setup has my motor spinnig at 25,000 or less.witch is well below the limit.If i could gear it ,i could run 10s on that motor.
From a couple of replys on my 1907 mainshaft comeing loose i gather it is not a uncommen problem on the older motor like i have.the new heli version that is in my phazor has 30 plus flights on with no issuse and david at gohbee has hundreds of flights on that setup with no issues.It looks to me like they didn't allow enough interference fit on the old 1907 for the mainshaft to the rotor,a new rotor asssembley should fix it right up.
I've had a couple conversations with bernie from castle witch is the retailer and order taker for neu motors on the subject of voltages , kv rateings, rpms, watts,amps and all the other stuff that goes along with eletrics.That man is a wealth of knowledge when it comes to motors and esc's.When it comes to voltage basicly it comes down to , the motor likes the highset voltage that you can run it at and stay below the rpm limit and gear it correctly.In other words a lower kv rateing at higher voltage will net you a better setup.for example.on a swift you need a motor that spins between 13,000 and 25,000 rpms to be able to gear it properly.In the case of the 1907 they have kv rateings rangeing from 1400 to 480 .In my case I'm useing a 915 kv on 8s to net 25,000 rpms.If you took the 2y 1907 at a 675 kv and ran it on 10s it would net you 22,500 rpm and be more powerful ,effeciant and cooler,For me it comes down to finding a battery pack that is light enough for the high cell count to not offset the power gains, as voltage goes up amperage goes down so in a 8s setup on the same motor you can get the same run times on a 25% smaller battery and so on.with the 8s set up i found the 3200 flight power 30c /60c batteries to be ideal between weight power and run times the pack weighs 24 oz and gets me 4.5 to 5 min hard 3d and it keeps the swift at 6 pounds witch is a pretty good power to weight ratio.
Another interesting conversation i had with clint akins from flight power,He helped david with alot of the testing on the phazor with the 1907 on 8s.He claims that was the most powerful setup they tested on that heli, and they tested alot of motor's.
I'm kicking around the idea of useing 2 trex500 6s 2500 flightpower batteries for a 12s setup in a swift the 2.5 y 1907 at 580kv would net 23,000 rpm's and batteries would only weigh 28 oz.
hope I'm not boring you guys I just whanted you to know that I've done my homework on this |
