Sunnysky x2220 980kv v3 • Looking for Efficiency • [The Judge Ep. 15]

[@WTJimmy]

This is an excellent and methodical approach to defining upfront what your objectives are, and validating those objectives with independent testing. The spreadsheet at the end makes it very easy to see the comparisons, and I like the way you mentioned your flight considerations in making your prop recommendations. Excellent analysis here John.....fantastic ROI for anyone considering becoming a Patreon supporter for your channel. Thanks!

[@RCVideoReviews]

I'm glad you're finding value in the content. Thanks for the nice comment.

[@jerrywillfong5770]

I am learning so much. Just trying to understand everything you do. Keep up the good work 🙂

[@RCVideoReviews]

Thanks for watching, glad to have you onboard.

[@DE3US]

Excellent work there John. Just shows the importance of matching parts correctly for the intended purpose. PS 1. - Beat you to it Robert ;-)

[@RCVideoReviews]

Wow! First First...pinned.

[@helomike7000]

Excellent breakdown. I'm getting ready to build my mini talon and will use your suggestion. Thanks for sharing.

[@RCVideoReviews]

You're welcome. I think this motor will be excellent on the mini talon.

[@OZSCQUADS]

Wow, you make shopping very easy. Thank you. Would you happen to have a video that explains the calculations? It`d be nice to calculate using different components added in.

[@RCVideoReviews]

I don't have a standalone video explaining the calculations, but they're pretty simple: Thrust / Watts is Efficiency. The idea here is how much juice does it take to make a gram of thrust. Higher is better. Power (thrust) / Weight (of plane) = Power to Weight Ratio. Bigger is better. For strong aerobatics I like 1.75:1 or better. Cruisers ~ 1.25:1, Sport Planes ~ 1.5:1. $/Watt is how much money it costs per watt. Lower is better.

[@markhonman4903]

Interesting measurements, but they are all static thrust. That would make sense for aerobatics but if you are looking for cruise endurance it is likely the coarser-pitch and smaller diameter prop (say 9x6 in this case) that will do the job for you. If you're using ecalc it produces a table of what I assume are steady-state speeds vs. current draw. Now if you had 2 thrust testers you could fake up a wind tunnel - with a big motor creating a movement of air at your planned cruise speed, and the other "downwind", used to test the candidate motor/prop combo "in the air".

[@RCVideoReviews]

In my experience flying with flight computers and data loggers, the difference in static/dynamic is rarely above 10%. In any event, since all my tests are static, the data is relative.

[@yojazdayo]

Very nice video. I wondering that is this collar with screw for? There is a holding clip on shaft already.

[@RCVideoReviews]

For use if you reverse the shaft.

[@yojazdayo]

@@RCVideoReviews oh, I see

[@dano5739]

I'm running this same motor on my mini talon, I ended up using a 9x7 aeronaut folding prop. Did you do some testing in the air? and are you still using a 10x5 prop? If you're goal is maximum distance, so more distant per mah you maybe ending up using a different prop then you're goal would be to fly as long as possible.

[@RCVideoReviews]

I do still have that motor on the plane, but I shelved the plane for the time being for other projects. I haven't done in flight efficiency testing, but generally larger diameter props yield higher efficiency. What did you find out?

[@mauritz1774]

Is it possible to pull the Shaft to other Side? Only with loosing the Scres without any Tools/Press?

[@RCVideoReviews]

I've never tried and don't have a loose one available right now. I doubt it though.

[@dielegend76]

Hi what different sunnysky long shaft and short shaft tq

[@Mt1Dmitriy]

Thank you, that was a very interesting testing! One suggestion - maybe in parallel with existing tests, there could be added value to run fixed watt test using different props. For instance, in this test it would be really interesting to see Efficiency numbers for different props with fixed wattage ~410. Because usually when we have higher wattage (at peaks) - we get less efficiency, so I wonder if APC 10x5 would actually beat 9x4.5 when working on the same 410 watts :)

[@RCVideoReviews]

Do you know about ecalc? They keep provide that type of data.

[@losien1]

I’m planning to use this motor on AR Wing PRO on a 6S setup and stock 8x6 prop . And maybe for extra speed I may try 8x7. Do you think it’s going to work? Thanks for the test!

[@RCVideoReviews]

Yikes…6s might be a bit much for this motor. I would advise putting it on a watt meter to check. I don’t think they intended for this one to spin quite that fast.

[@losien1]

@@RCVideoReviews thanks but i have neither of them unfortunately... I need to buy the motor and can only relay on whatever eCalc says and hopefully it’s nit far off. The only warning on my configuration is “electric Power: 728.3 W > Limit (up to 15s): 640 W) so that’s 90 watts over the limit if i’d go full throttle which I don’t intended to do often.

[@kevinflores105]

Hello, Between SunnySky and T motors, which one would you choose? Thanks for the objective content, greetings from Peru

[@RCVideoReviews]

I would take Sunnysky v3 first.

[@kevinflores105]

@@RCVideoReviews great!, thanks you very much!

[@davidknutz3314]

I wonder if their advertised weight is motor only without the Bullet Connectors and the associated heat shrink?

[@RCVideoReviews]

I think you're right.

[@brkfpv60]

very nice rewiev thank you , i use sunnysky 2826 550kv on my mt .

[@RCVideoReviews]

Nice 👍

[@mcredtailflyer574]

Hey I'm really impressed with your work on those sunnysky motors, as I was watching your video I was wondering what those numbers would be if you used a wooden prop, have you ever done so with a wooden prop? Thanks Michael

[@RCVideoReviews]

I love wooden props and that might be an option very soon. I don’t really think about wooden props on the mini because it’s not too hard to chip props landing these.

[@TheRCAirMarshall]

How does this thrust tester measure RPM? Does it have an optical sensor?

[@RCVideoReviews]

It's derived from Kv and voltage. I think Kv is off on this meter so I don't place too much stock in the RPM value.

[@flynat-rc]

I am sorry I saw at the end that you use APC prop ...I ask, have you test also 3s batteries?...thank you

[@RCVideoReviews]

Not for this setup, although I may take a look at 3s with a larger diameter to see if it is more efficient.

[@flynat-rc]

@@RCVideoReviews thank you

[@flynat-rc]

Its very interesting but you should show what kind of prop you are using eather...the results are usually very different using several types of prop...

[@RCVideoReviews]

I think I mentioned they are all APC props: 9x4.5, 9x6, 10x5, and 10x6. It's also shown in the results chart at the end of the video.

[@flynat-rc]

@@RCVideoReviews thank you

[@paulhope3401]

Probably factory weighed completely bare without the bullets and heatshrink.

[@RCVideoReviews]

I think you're right.

[@jeferssoncachone4318]

que motorzinho potente em.

[@RCVideoReviews]

Sim, a Sunnysky fabrica motores potentes.

[@ansariflightplan5814]

Adapter size

[@RCVideoReviews]

You might want to rethink your approach.