I personally found that the single blade prop on the spring really helped battery life which was nice, will have to test the supersprint with same electronics once I get it built to see how it compares
Next time you do something like this put together a graph of thrust vs power. As is you are only showing the values for max throttle, but when it comes to endurance you will likely be in lower throttle values for much of the run. You can also show velocity vs power.
Yes, you are right. Thing is, as I am doing all the sensor readings manually and write them down, I need to keep it simple. I need to be able to print many parts and do many tests quickly and compare them all aganist each other in the simpliest way possible. So that's why I am choosing the max throttle performance as the only point of measurement, which obviously comes with some drawbacks.
@@mjetdevelopment when I do it manually, I’ll set the throttle in steps, like 10%, 20%, etc or 1200us, 1300us, etc, record the values at those throttles, graph the result and take the log trend-line of the total result (to flush out error), and thats effectively the graph. In practice it’s quite reliable, at least for drone flight time estimates.
@@simonschneider5913 Do you know any way to measure 70A current with arduino? Always when I tried searching, high current applications did not seem very common. I have no experience with arduino tho, maybe the answer is obvious.
Thanks! The Supersprint files are available for purchase together with the older Sprint: www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-sprint-3d-printable-rc-jetsprint-boat-model
nah, seriously...there should be two versions, if possible. I guess those goals are opposing each other design-wise...so one could optimise for both when having two models, right
I have a question for people that are smarter than me what is the advantage of a single blade impeller because to me it seems like it would be offset and vibrate more
I believe the reason is, single blade has less surface and causes less losses due to wall friction. The wall friction effect is very important at such small scale, where walls are close to each other and the flow area is small compared to the surfaces enclosing it. Of course with big pumps, there is so much space everywhere that the wall friction is no longer so important. The single blade impeller is not fully balanced, but this only creates a problem with higher density materials. Plastic is lightweight enough to just work without having 100% balance. On the M-Jet 35, which uses a 3D printed metal impeller, full balance is achieved by using counterweights. For more insight, you can take a look at more videos and playlists on this channel.
I personally found that the single blade prop on the spring really helped battery life which was nice, will have to test the supersprint with same electronics once I get it built to see how it compares
i heard before that this was actually very efficient. never really got the physics behind all that, tbh..and the bearings wont like it i guess??
I found my bearings died to water(I was using cheapo ones) prior to any other issues.
@@simonschneider5913
Nice test 🤙
Another good video!!!
awesome)
Next time you do something like this put together a graph of thrust vs power. As is you are only showing the values for max throttle, but when it comes to endurance you will likely be in lower throttle values for much of the run. You can also show velocity vs power.
Yes, you are right. Thing is, as I am doing all the sensor readings manually and write them down, I need to keep it simple. I need to be able to print many parts and do many tests quickly and compare them all aganist each other in the simpliest way possible. So that's why I am choosing the max throttle performance as the only point of measurement, which obviously comes with some drawbacks.
@@mjetdevelopment when I do it manually, I’ll set the throttle in steps, like 10%, 20%, etc or 1200us, 1300us, etc, record the values at those throttles, graph the result and take the log trend-line of the total result (to flush out error), and thats effectively the graph. In practice it’s quite reliable, at least for drone flight time estimates.
@@MarcStollmeyer Sounds like a good way. I might do this with the final design to earn more information about it.
@@mjetdevelopment arduino logger? i used AVRs for that before, you can output to a terminal on a pc, or a txt-file on an SD
@@simonschneider5913 Do you know any way to measure 70A current with arduino? Always when I tried searching, high current applications did not seem very common.
I have no experience with arduino tho, maybe the answer is obvious.
Performance above run-time always! 😁
Nice work!
Where can I buy the Files to print it?
Thanks!
The Supersprint files are available for purchase together with the older Sprint:
www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-sprint-3d-printable-rc-jetsprint-boat-model
i want both! :)
nah, seriously...there should be two versions, if possible. I guess those goals are opposing each other design-wise...so one could optimise for both when having two models, right
Yes, it might be possible to have multiple versions. I like to keep things simple, but for example impeller pitch could have some options.
@@mjetdevelopment i can see how that escalates quickly! :)
I have a question for people that are smarter than me what is the advantage of a single blade impeller because to me it seems like it would be offset and vibrate more
I believe the reason is, single blade has less surface and causes less losses due to wall friction. The wall friction effect is very important at such small scale, where walls are close to each other and the flow area is small compared to the surfaces enclosing it.
Of course with big pumps, there is so much space everywhere that the wall friction is no longer so important.
The single blade impeller is not fully balanced, but this only creates a problem with higher density materials. Plastic is lightweight enough to just work without having 100% balance.
On the M-Jet 35, which uses a 3D printed metal impeller, full balance is achieved by using counterweights.
For more insight, you can take a look at more videos and playlists on this channel.
Thank you that makes a whole lot of sense
I'll take speed over run time!
You sound czech
I am czech:)