It sounds great, you can increase the pitch on the front by 80% from normal and nearly double on the rear prop. One will feed the other and just keep winding up. See our Spitfire and contra-rotating videos at rctwins Expect a slight pull to the right on takeoff! Happy flying!! From Rod and Rich
Do you have different prop pitch angles front and rear? Front prop twists airflow and aft prop receives airflow with higher angle of attack. Usually front prop has higher pitv than aft so both of them has same efficiency
the front motor will drive the rear prop with a hollow drive shaft. the rear motor wil drive the front propeller with a solid shaft running inside the hollow one in the opposite direction.
P = I * V so P = 65 amps * 23 volts, so P = 1495 watts or P = 1.49 kW or P = 1.998 hp of electrical power if current and voltage were constant. So RMS power is about 1.4 hp only. Then maximum efficiency of a propeller is at best 80%, so just enough power to blow some papers around!
I agree his voltage calculation was off by a factor of 2 (assuming his given numbers are otherwise accurate), glad I'm not the only one who caught it.. but you can do a whole lot more than blow papers around with 1.4 hp. I assume this was placed on a moderately sized model aircraft. Of course, you'd be crazy if you expected it was meant for something other than a model to begin with...
It sounds great, you can increase the pitch on the front by 80% from normal and nearly double on the rear prop. One will feed the other and just keep winding up. See our Spitfire and contra-rotating videos at rctwins
Expect a slight pull to the right on takeoff! Happy flying!! From Rod and Rich
"oh yea, she'll fly alright"
I love the part where the remote almost flies away haha
This is beautiful
This sound is awesome....
That is awesome!!!!!!! Makes you want to build a Tu-95!
Uff look very efficient these really yes
Very nice
i really like your bike
Thats great, How did you make the rear spinner?
Do you have different prop pitch angles front and rear? Front prop twists airflow and aft prop receives airflow with higher angle of attack. Usually front prop has higher pitv than aft so both of them has same efficiency
Ehi! Very cool! Where did you find the propeller covers (red and silver)? What propeller size are you using?? Let me know!! :)
Why is this video gaining popularity after nine years? That motor produces some serious thrust.
looks powerful and wondering if a twin rotomax version is possible in that configeration?
thats some extreme rpm
👍👍
Do a video of a flight test !
Is this a system that you developed and built? Or is this a semi off the shelf option that you're testing?
Amigo quê motor potente hem gostei e tome like 👍👍
At last I've found an efficient shop-vac
Wow that is awesome 👌. I like it .
WAAAAAAWWW!
On what aircraft that motor and prop its gonna be mounted on?
When you see papers flying on the other end of the garage that are not even behind the prop......
Hey there! Who is the manufacturer of these motors?
Great Job. Can you PM me on where can I buy one of the gear boxes, Thanks.
Two sets of blades are running in opposite directions?
Hi
CR50L 320KV contra-rotating motor
Where to buy???
How did you build it?
Is it just me or do the blades spinning up sound like the THX sound.
'
are propellers same spins or opposite spinrs
sounds like a tornado siren lol
23 volts X 65 amps = 1.495kW. Is that for each motor?
Sounds like nuclear bomb siren🚨
23 times 65 = 1495 watts. Why did you say "total power 3 kw"? Because two motors?
Where can I get one?
You sure that's 65 amps? Those cables look pretty small to carry that amperage
i wonder how do u get 2 props moving the opposite direction in the same place
coaxial shafts
can you explain me how you bolted the rear propeller to the motor? Send me photos os something if yo want please.
the front motor will drive the rear prop with a hollow drive shaft. the rear motor wil drive the front propeller with a solid shaft running inside the hollow one in the opposite direction.
0:26 esc going to fly.
What is the thrust ?
with 3kw total power 65A on 6S lipos i predict around 8kg or 17lbs
+
Air raid siren!
Ya, lets just turn on something that spins super faster with a bunch of wavy cloth things around it.
you must be fun at parties
"I'd like to play a game"...
why tf would people dislike this, lol
Siren head sound.
Bro the entire room was trying to fly wtf
P = I * V so P = 65 amps * 23 volts, so P = 1495 watts or P = 1.49 kW or P = 1.998 hp of electrical power if current and voltage were constant. So RMS power is about 1.4 hp only. Then maximum efficiency of a propeller is at best 80%, so just enough power to blow some papers around!
I agree his voltage calculation was off by a factor of 2 (assuming his given numbers are otherwise accurate), glad I'm not the only one who caught it.. but you can do a whole lot more than blow papers around with 1.4 hp. I assume this was placed on a moderately sized model aircraft. Of course, you'd be crazy if you expected it was meant for something other than a model to begin with...
this should be 2300 Volts 6.5 amps. would be much better
Ok, that's called success untill it crashes...
Still success, its called product development 😄
Wouldn't want to be the camera man
3kw does not seem correct rather about 1.5kw with the specs given.
Sadly, this guy can not respond to comments as he died in a fiery plane crash.