Newbie help with thrust.......
|Frank Skilbeck||10/07/2017 18:09:43|
4430 forum posts
Yes, the beauty of an electric motor is it's flexibility, but while this would turn a 30 x 10 it would be at less rpm than 150cc version, and power is roughly proportional to the rpm squared, i.e. if it turns 2 twice as fast it needs 4 times the power, so you'd have to drop the volts and that would drop the amps, and the thrust.
|48 forum posts|
|I assume you realise that 12s is not 12V. It is 12 lipo cells at 3.7V each. 12x3.7=44.4V|
So this motor would spin it, but at 44V to match 100cc engine.12V would not be even close.
|48 forum posts|
|So at 44V you would need 4 batteries in series. It would pull 180A, so 4 lithium car batteries of say 54Ah each would run the motor flat out for 18 minutes. (discharging to a point that would not be advisable).....and I am guessing be a bit heavy and bulky into the bargain.|
|David Wainwright||10/07/2017 20:00:58|
|20 forum posts||Yes, this has been covered and refer to first post re what needed. |
Seen 80cc motor, batteries and controller for under 500 that will produce what is needed. Didn't want a rocket.
Thrust produced by above will be more than adequate.
Thanks to those who chose to share knowledge rather than be blind to fact knowledge is only power when shared.
|Paul Marsh||10/07/2017 20:35:18|
3670 forum posts
I was wondering if you intend to fly your rig, I hope you know what you are doing. Also any legislation you will need, You should join the relevant club even before you spend any money. I reckon you just can't launch yourself into the air without training or licence and what I see here is a little risky - strapping a 80cc plus motor, with a 30 inch carbon prop doing 10000rpm with 44v of lithium batteries on your back, with no idea what you are doing. EEK!
Sorry, but it looks like that - getting chopped up in the air with a 30inch prop then blown up when the batteries catch fire...
Edited By Paul Marsh on 10/07/2017 20:36:55
|David Wainwright||10/07/2017 20:40:32|
|20 forum posts||Condescending? You don't know what it means!|
Edited By David Wainwright on 10/07/2017 20:54:05
|David Wainwright||10/07/2017 20:53:27|
|20 forum posts||Now see here,|
If you had bothered reading original post you will see it was a request for info and background as to neivity.
Not sure which part of your answer addresses this.
For your info, I trained and qualified in Derbyshire several years ago. During a session teaching, I saw folk steering their wings using cordless leaf blowers. I was never after a five grand rig, just a compact and light alternative for extra thrust.
If you would care for a lesson get in touch!
As for rpm, I'll be happy with max 5000 after doing calculations.
Thanks for the unwanted concern however. X
|Biggles' Elder Brother - Moderator||10/07/2017 21:03:37|
15748 forum posts
Right that's enough.
This thread is closed.
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