Janis Putrams
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Vibration analysis

Started this discussion. Last reply by Janis Putrams Jun 15, 2015. 4 Replies

Hi,My transmitter has not arrived yet so I have been trying to get deeper understanding about brushless motor and prop vibrations.I did not have any success using phone for vibration monitoring so I…Continue

Tags: brushless motor, propeller, vibration


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Please tell us a bit about your UAV interest
I am involved in a project developing an experimental and rather large multi-rotor flying vehicle.
I am also interested in the theory and the scientific way of research.

Comment Wall (4 comments)

At 12:43pm on June 20, 2016,
Forrest Frantz

Janis - You are insane!  Completely off the edge of the envelope (an American expression). Absolutely loved your video. 

So what do you want to know? How can I help?

At 11:24pm on June 20, 2016, Janis Putrams said…

Great that you liked the video.

The bigger vision for me is that I think that air is very much underused. There are big planes and small copters but not much in between.
My assumption is that it is generally because of the cost of flying machines and the complexity of reliable control in the air. Electrically powered and electronically stabilized flying machines could bring the cost down to the level similarly to what Mr. Henry Ford did with automobiles.
Many refer to battery technology as the limiting factor but according to Elon Musk the evolutionary improvement in battery density is about 5% annually. In case no revolutionary technology is discovered that makes 50% improvement in 10 years. Personally I think it will be more as both EV and mobile device manufacturers are pushing very hard to improve battery capabilities.
I am currently working on a 16 propeller setup that according to my tests and calculations will be able to lift and carry about 80kg (176lbs) for 12 minutes.
What do you think about general advancement direction of short range aviation technologies? What are the greatest challenges?
At 2:11pm on October 12, 2016,
Forrest Frantz

believe it or not, i just checked my mail.

really cool.  love the design.  Simple, light, redundant. and like the way you protected the props.  sometime i'll show everyone a simple and extremely light method of rejoining carbon tubes back into a solid piece. rejoining 15 mm tube only weighs 8 grams and produces a tube with slightly more strength that the original tube.

people would love to see a video of that puppy flying. got one yet?

on load capacity, for:

- stable hover, you need about a 25% reserve between hover thrust and max thrust (so max load = 75% max thrust)

- stable flight, you need about 35% reserve between flight and max thrust (so max load = 65% max thrust)

- stable flight in wind, you need 50% reserve (so max load = 50% thrust)

At 4:57pm on January 26, 2017,
Forrest Frantz

Thanks for sharing the videos.

Fricking unreal!!!  Wish I'd seen this earlier (got too busy at the end of last year).

Looks like you got Yaw solved and the ship going and solved the problems.  Well done.

Where can you find water that isn't frozen this time of year?

So have I been so busy that I haven't shared how to join carbon tubes (let me know ... thought I did)?  And Jon figured out how to make really durable and light-weight printed motor mounts (saw that you were using Al).

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