Contra Rotating BL System 375W

 Flyitall 624 points

That would depend on the rotation of the motors used on a y-6 copter. I don't remember offhand, but I think that the motors mounted on each arm rotate opposite each other. If that is the case then YES this can be used to good effect on a y-6 as you would only need to mount three motors as opposed to six. also slight wieght savings. Drawbacks include not being able to use prop savers, and the weakest excuse for a motor shaft I have ever seen.

 Flyitall 624 points

Setscrews hold front motor can on. C-clip on shaft at rear. Good idea to lube bearings while you are there.

 Flyitall 624 points

Douglas Mixmaster! Awesome build, but way too heavy for this set of motors. Also the shaft is so small in diam and so soft, that blowing on it hard will bend it. Hk sells another set of counter rotating motors that are better suited to 2.5 kilos of wieght. It is currently out of stock, but see this sku, COAXD3410, under specialty motors, this site.

 kiwi4 199 points

To convert from a two blade prop to a three blade setup,its common to decrease the diameter or the pitch by 1

 Tressie 231 points

Thanks Kiwi4. Plenty of counter rotating, 9 x 4.5, 3-blade propeller pairs available. Splendid!

 bhoov128 6 points

Try changing your ESC settings to a faster timing setting.

 rc speed 277 points

YES BUT YOU NEED DOBLE POWER ESC

 Flyitall 624 points

Do NOT run these two motors on one esc. They can come out of synchronization and damage your esc and or motor(s). Use two smaller esc's.

 Don 2 points

do I even get a power to weight ratio of .70-.85? a 1 ratio would go really far from scale size

 rc speed 277 points

locteit oder moment universall

 Mlapo 2 points

Aero Electronics Operations - AEO Tech - P1060 Combo - 10x6.

 Markw 21 points

I could not find one on the HobbyKing website and made one myself out of 2 mm plywood. You need to be very precise with this since the holes for the screws are very close to the housing.

I made a template of the mounts by removing the motor on the back. You can then make the mount black with a pencil and press it against paper.

 Is40:31 1463 points

I have an E-Flite P-38, and like the actual plane, it is provided with a reverse rotation propeller. I am using all turnigy electronics and so far after half a dozen flights everything works well. The anser to your question is all that you need to do is change any two of the motor leads to change the rotation of the motor. I have read elsewhere that you should change to two that aren't red, but I have motors that have all the same color leads and they all react the same way.
Regarding your project, be aware that the prop nut on the reverse rotation motor WILL loosen and come off if it is not secured properly, or mounted with lh tread collet (which I don't recall ever seeing). Make absolutely sure that you loctite it or double nut it or both. I didn't experience any trouble, I used two nuts and bottomed them good. I also spent a whole lot of time with the plane on the ground checking all of these things, full throttle and then checked, all good.
btw, why did you post your question under this motor ? ? ? Beamers is spot on but like me, confused as to why you picked this motor.
Anyway, have fun, good luck and happy flying ! ! !

 chout 15 points

thanksto beamer and Is4031 this will solve my problem.

 Beamers 86 points

As usual brushless motor, you can reverse their rotation of the two motor. But dont think you need it regarding it's counter rotating isn't it? But anyway your reasons, if you will do that, don't forget to change the position the upper prop with the lower one also the opposite to keep the thrust at the same way.

 Eric1180 2278 points

No it's not both are pullers

 iskandar taib 5 points

Pusher vs. tractor simply depends on where it's mounted and which way you make it turn. You do need a "left hand" prop (what people call a "pusher") AND a "right hand" prop f you want contrarotating props. Flipping props around won't work.

If you mount the motor in the rear of the airplane you'll have two pusher props, but you still need one right hand and one left hand prop.

 steve1814 16 points

Well, I have mine mounted. You can see the results www.link is the entire www.link like I will need new bearings.

 -boot 212 points

the props need to be the same size for the same reason any twin engine airplane uses the same size props on both engines. one prop would function as a speedbrake.

 RodrigoV 77 points

No. Props should be diferent in size and pitch. The back prop is turning on already accelerated air so it should have less diam and more pitch. There is no comparison between a coaxial and a regular twin engine plane.

 kiwi4 199 points

the reason for using counter rotating props is to eliminate torque,if prop size's arent the same it will not work properly.look at every full size aircraft that have counter rotating props,they are the same

 iskandar taib 5 points

Actually, most full size airplanes with contrarotating props use constant speed, variable pitch props. The rear prop is set to a slightly higher pitch than the front prop, as mentioned by the earlier poster. I think since these motors aren't geared together, you could simply run the rear motor at a slightly higher speed. You'd need separate channels for each throttle and some sort of mixing curve, I suppose. Or maybe you can tweak the speed controllers.

 rpooley 1 points

The rear motor will run at a higher speed on its own because of the lower resistance of the faster moving air.

 Mlapo 2 points

Aero Electronics Operations. Prop: P1060 Combo or 1060 or R1060.

 zeljka 64 points

You can use 10x4 or 10x5 prop.

 Mlapo 2 points

Aero Electronics Operations. Prop: P1060 Combo or 1060 or R1060.