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Jul 01, 2016, 05:08 AM
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RCQuads's Avatar
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Efficient Motor Question for Long Range


SO Hey guys,
I have some questions. Wanna build a long range qavr xl 6" running crossfire and 2.4 video.
Thinkng about using 2000kv motors on 4s with 6x4.5 props. Or should I choose 1500kv motors on 6s. Or go with 2300kv motors on 3s? I'm a little confused right know
would be happy about answers!
Thomas
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Sep 14, 2019, 01:15 PM
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Confused?

Short answer - doesn't matter. Why?
Lets say you have 3000KV 3s.. and need 80W per motor to cruise. Thats ~8A.
For 1500KV 6s, your identical props need to be spinning identical speed to make same thrust.
Same 80W. Its just 4A x 20V now. Virtually any wire/ESC can handle 4/8A.

For long range need more efficient thrust pushing less weight:
1. Bigger prop (low pitch)
2. Less weight
3. Aerodynamics

On 5" you can only get like 4g/W. On 9" 8g/W. On 15" 13g/W.

Get 7" minimum.
Sep 15, 2019, 05:40 AM
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I have the same doubt but a bit different...

Built already a 7" quad for long range and with bi-bladed props and 1600kv motors. It stays in a hover >30 minutes out of a 4s2p Li-ion that I built. it hovers at around 30% throttle.
My doubt would be, what if instead using the 4s2p Li-ion, I build a 5s2p or even 6s2p... or even 6s1p. What would be the difference in flight time?
Sep 20, 2019, 05:46 AM
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Quote:
Originally Posted by Swissete
I have the same doubt but a bit different...

Built already a 7" quad for long range and with bi-bladed props and 1600kv motors. It stays in a hover >30 minutes out of a 4s2p Li-ion that I built. it hovers at around 30% throttle.
My doubt would be, what if instead using the 4s2p Li-ion, I build a 5s2p or even 6s2p... or even 6s1p. What would be the difference in flight time?
Any ideas?
Sep 20, 2019, 07:20 AM
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Quote:
Originally Posted by romangpro
Confused?
I am. you're replying to a 3 year old thread.
Sep 21, 2019, 03:06 AM
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Question continues being valid...


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