coaxial propellers

first test prototype,double propellers paramotor,no torque,no gyroscopic effect.Simply straight flight

Category:

Sports

Tags:

• coaxial
• propeller
• paramotor
• camponogara
• strubbo

[fongio86]

bella cosa!!! ....che ti chieda (da ingorante), dato che hai detto che la spinta potrebbe essera scarsa e, di conseguenza ti obbliga a tenere il motore molto alto di giri, compromettendone magari l'affidabilita, aumentando la lunghezza delle eliche e il grado di incidenza delle stesse, non avresti una spinta più adatta al volo e al decollo???

[steam1981]

Hai ragione,infatti sto risolvendo il problema,il fatto è che eliche+grandi=meno giri,quindi devo cambiare il rapporto di ingranaggi e non ci sta all'interno dei quella scatola,progettata da me(da ignorante)solamente per il numero di giri adatto a eliche piccole.....minchia!!!

[wallyhines]

Improve maneuverability? I'm not sure what you mean by this.

It's a cool idea but to what advantage?

[steam1981]

With normal single propeller i turn fast to left,but so slow to right and with more brake added to right....(or i must decrease the gas).With 2 contra-propeller i turn fast to right like to left,without decrease the gas!!This is the most important advantage.

Another advantage is; No gyroscopic effect,this is more difficult to explain for me,in english,i hope you already know what is the gyroscopic effect!

[wallyhines]

Shorter blades = more noise due to hitting speed of sound.

I have the identical motor less the extra weight/complexity of coaxial props. Cool fun but practical?

[steam1981]

The tips of blades has the same speed of the original blade(600 Km/h). this system improve the manovrability

[davea0511]

@THEMAN080 It' seems that way but it in fact opposite-spinning-blades are used for a lot of the battery powered remote controlled helicopters which helicopters have to be the peak of efficiency because of the intense power:battery-mass required to sustain flight for a reasonable amount of time. Check wind-tunnel tests ... propeller blades push wind perpendicular to their plane, they do not spin win much at all, so opposite spinning blades that are cut right are very efficient.

[THEMAN080]

@davea0511 The aerodynamic effects of this design would make the propellor so inefficient it would be unusable. I think

[davea0511]

Might I recommend an alternative design? Instead of two blades, make the 2nd blade a hoop of metal held in place with bike spokes, for the sole purpose of cancelling out the gyroscopic force. It should then be much quieter, smoother, and I suspect safer (from diminished vibrations and blade/motor fatigue).

[easygtr]

So how do we get one of this?

[Dreameatertv]

omg if u can fly why dont you travel the world like the avatar :) how can i get one of those flying things

[FantasticBob7000]

Man I love this stuff!

[yakcrasher]

@wallyhines with a normal para-glider there is some torque that will try to steer you off course but with a coaxial system the torque balances out because of the two propellers.

[bro0o0y]

ciao dove posso comprare quel tipo di motore

[SunsetWingman]

No torque! Although the prop sticks out much farther leaving it less protected from the cage