Motor and Prop Wisdom: Part 2 (answering your questions!)
ฝัง
- เผยแพร่เมื่อ 17 มิ.ย. 2024
- eCalc Homepage: www.ecalc.ch/index.htm?Painle...
eCalc Easy View: www.ecalc.ch/motorcalc_mobile...
How to evaluate motor parameters you have at hand www.bavaria-direct.co.za/const...
Motor shown: www.leomotion.com/pi/Dualsky-...
Props Shown APC: www.leomotion.com/ki/Propelle...
Time Codes:
0:00 Introduction
1:40 Tractor versus puller prop?
4:55 Twin versus single motors?
7:05 Motor temperature and how to manage
15:44 What do you do if you can't find the motor on eCalc?
19:08 Sizing ESCs to the motor you use
21:12 How to match a prop to a motor for efficiency
28:34 Summary
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I forgot how useful is E-calc is for motor/prop selection. Great refresher on some very useful info!
Another fantastically informative video. Thank you Markus and Lee!👍👍👍💯💯💯
Excellent presentation once again. Thank you to both of you for taking the time to produce this video.
Another fantastically informative video. Thank you Markus and Lee!
What a great tool. I’ve used it for years and I can’t believe it’s $8 a YEAR for just one tool. Saved me so much time that it payed for itself 20 times over.
Fantastic conversation, Lee! Full of tips! 😃
Thanks a lot!!!
Stay safe there with your family! 🖖😊
Very interesting stuff.
Something I'm curious about is how one of the standouts in the market for efficiency and endurance, the STRIX Nano Goblin, gets away with its motor and prop setup.
It runs a 1606 4000KV motor and a Gemfan 3 blade 3052, in a pusher configuration. Even with a 2S Li-ion pack that's still significantly higher RPM than other planes.
It would seem to be doing everything wrong for efficiency and noise: high KV, small diameter prop, extra blades, pusher configuration. Yet it's widely considered one of the quietest and most efficient platforms on the market. What gives?
I have been wondering this too
My guess is that it isn't actually very efficient. It gets long flight times because it has a Li-ion battery that is way bigger than the batteries on most planes that size. If such a battery were used on a tractor motor glider with a large prop and a low KV motor, I think the flight times would be even better.
I've personally been making my first wing. Enjoy comunity.. in my quest for knowledge. Not many videos on Props.. motors.. direction and size and why'.. thanks! Wings in general. Coming from quad's. Didn't even know push only props.. can you use any prop for a Wing? As long as installed right. ??
You can but some props will work well with some motors. You tend to find that there is more of an eye on static thrust for MR props and a greater balance in FW props as it is the wings that create the lift.. See the other video in the series..
Lee, One question that I have about eCalc is about the ability to save a configuration. Over the years this has been my biggest trouble, is that every time I pull up the program I have to re enter information for every setup I want to test. This can be inconvenient when working on multiple projects. Is there an existing way to save setups, or is there an alternate reason that Pawel has not added this feature? I know this video is a little older, but I hope that you still see this response.
Hit the „share“ button and save the generated link in your favorits…
So what about situations where you have something like a 6.5x14 on a goblin? Am I going to have to catapult launch it? I have tested it once so far and it did not go well at all.
It would be cool if you could just touch on some of the more exotic stuff to give us adventurous builders a building block to start with. Ecalc is great but I haven't had much luck trying to figure this one out... My membership also needs renewed 😬
Launch is all about static thrust. If the setup you have is tricky to launch then you need more than what your existing setup is giving you... Best of luck
Will E-calc add ducted fan data ?
Does speccing a lower TWR prop and motor combination give a produce a noticeably more efficient vehicle, and if so what's a good minimum TWR? RC planes tend to have TWRs above 1, but in larger scale aviation you see significantly lower TWRs across the board, from a 737 (~0.3) to a Cessna 172 (~0.25), and only fuel guzzling fighter jets go for TWR >1.
Great question. See my other video on choosing a FW motor and prop where I cover that... Happy flying
RC Planes with 0.4 TWR and lower are hard to fly...
ecalc have sizing methods separately for fixed wing and multirotors. If i want to design a Hybrid VTOL(4+1) plane, how do i go about it
I'll add this to the list for a future video.. Thanks for asking..
Does Ecalc have to be FPV related could we have a brief view on heli setups with Ecalc please
I am guessing you mean FW (fixed wing) related rather than FPV?
I use the cheating method of choosing a prop & motor, by following the recommendations of the manufacturer, though it can be confusing.
I’m preparing to work on a new model, that recommends a 2216 900-1000kv motor, 20A ESC, & 8’- 9’ prop. I use a 2216/ 960kv motor & 45A ESC combo in another model and it works beautifully with a 10 x 5 prop.
So I purchased this again for my new plane, with a 8.25 x 5.5 prop (9’ prop wasn’t available).
The manufacturer of the motor/ESC recommend a 10 x 5 to 12 x 6 prop.
So the intended prop is smaller than recommended for the motor, I have spare 10 x 5 props but they’re larger than recommended for the model.
This plane is a WW1 scale model so I’m hoping that if I stick with the smaller prop, that it will fly well in a scale manner.
Can you foresee any problems?
It'll pull a lot less current and the static thrust will be less. Using ecalc to check will show you by how much.. Best of luck
Assume you have a Pull propeller on a motor on front of the aircraft. Now move this motor to the back of the aircraft and change the motor rotation: will the motor/propeller work as a Push type?
Yes it will. Happy flying!
The 66% Rule doesn't seem to apply to Big-Quads .........
My best calculations based off of T-Motor's Spec-Sheets, ( for a huge Camera Platform),
seems to be more like Diameter X 30% = highest efficiency.
21" X 6.3" Pitch at "Hover-Power". ( 1451.5 - Grams of Static-Thrust per Motor/Prop Combo ).
Top-Speed is not a priority, but Maximum-Thrust is still over 3X Hover-Thrust.
~48-Volts X ~15-Amps Max.
.
.
.
I think this needs discussing in the next video (if we get enough interest). Another example I mention in the video is that smaller 5x5 props are not a bad choice for things like the AtomRC Dolphin but according to eCalc they will stall... Happy flying
Hi Jim,
the 66% rule is NOT for best efficiency. It is a rule of thumb where the laminar air flow over the blade stards to get turbulent. e.g. if you in crease the pitch of an 18“ prop byond 12“ the propeller blade tends to stall in static conditions.
To load 50 kg
Can i use 1000 kv bldc motor
That is a huge weight for a single motor. You can find that out by putting the data into the ecalc tool. Best of luck
@@Painless360 ok