You know how it is....

[ChrisH]

...everything going well with the F450, still so much to learn and thoughts turn to "What next?" 

I have been thinking about things I would maybe like to be different/improved on whatever is next and a question or two pops up!

One minor thing I would like to change that comes under the personal preference side of things is the mosquito type buzz from the motors/props.

I think I understand the basics of the volts/speed ratings (how many rpm per volt) and currently run standard 920Kv DJI motors on 3S Lipo';s. My question is, if I was to build a new multicopter (probably a hex) is there a technical reason why you cannot use a low Kv speed rated motor but higher power rating running on the minimum cell size, this would give me a slower running motor with possibly a larger prop and I reason, a quieter flight? I realise that there would be a cost involved as the bigger a motor gets the more expensive!

Does this reasoning stand up in a practical sense? 

I';ve seen a few videos of multi';s flying at considerable reduced rpm compared to mine with a far less irritating buzz. This may just be due to quality motors and good props but I want....

[robshaw]

I wouldn';t know if it would work or not but I love the idea. May help with ';jello'; when filing too. Be interested to see how you get on if you go down that route. I think in theory it sounds feasable.

[ChrisH]

Thanks Rob, That';s one vote! It';s probably a way off before I do anything but it';s good to try and plan a little! 

Maybe I';m thinking along Rolls Royce lines - big, slow, powerful and quiet! Compared to a Japanese bike at 15,000rpm, no contest for me!

Be interesting to see what alternative views I get. 

[fruitsalad]

lower kv motor you can use  bigger prop,less rpm giving more thrust and quieter flight,plus better flight times..

[ChrisH]

Ah! My thinking is looking good then, Fruitsalad! Sometimes when embarking on a build project I feel that minimum cost can at times be an overriding build target, ignoring other possibilities. I realise, of course, that for many people the bottom line cost is the overwhelming driver out of necessity.

I want to take my time and glean as much knowledge from the many learned peeps on this helpful forum! (creep mode off!). If it takes me longer but I achieve my targets, all well and good. I';m not being driven by the desire to get something in the air, I will continue with the F450 for sure.

Looking forward to alternative views. 

[Yosser70]

Maybe I';m thinking along Rolls Royce lines - big, slow, powerful and quiet! Compared to a Japanese bike at 15,000rpm, no contest for me!

I like your thinking :-) I';m very very new to all this but that is the sort of thing I';m aiming for myself so look forward to what people have to say about this.

[alextang]

Dear Friends:

I also consider this is the possible way to improve stable fly since I am building a fly project of Geography.

Thus, I change propel from 1045 to 1147 for my Quarotor with Crius SE V2. Changing the throttle curve and PID as suitable.
Hope I have chance to do the experiment like 1045 did as quick as possible. Then, sharing the result with all my friends.

Have a nice flying day
Alex [\]

[ChrisH]

My ideas are slowly coming together. Tarot FY680 frame built. 2814 710Kv Tiger type motors running 13x6.5 carbon props with 3S batteries. I';m only hanging a GoPro on a RCT gimbal so shouldn';t be heavy. Should have loads of power with the six Tigers and they shouldn';t have to work very hard.

Hopefully give me something like my target!

Flying soon