Turnigy RotoMax 1.40 Brushless Outrunner Motor

 Gary 3001 points

This motor is rated to a max of 75amps continuos,with a 10s lipo and a 20 x 13 you will be drawing 127amps,this will burn the motor out.With a 10s lipo and a 18 x 10 prop you will get 2672 watts at 73amps.On a 19 x 8 prop you will get 2656 watts at 72amps.
Hope this helps.

 ishady 340 points

Thanks for the reply. Would you think it wil be better with Turnigy Rotomax 1.60 then? Thank you again

 Gary 3001 points

Yes,this would be better,although motorcalc still calulates the 1.60 with a 21 x 13 will still run more than the recommended 80amps,so would still prefer to use a 21 x 10 or similar.

 __RRAP 43 points

Hello! any help here?????

 diy-pro 290 points

Might be under powered. Check what the power difference is between 1.4 glow engine and 30cc

 diy-pro 290 points

Better yet does your 30cc push a 20x11 prop or larger?

 __RRAP 43 points

I dont know the difference between 30cc gas and 1.4 motor, Do you know, and can you give me the figures. I can use up to a 21inch prop.

 __RRAP 43 points

I havent got a 30cc engine. I only use electrics. But this plane,RV-8 2,050m wingspan can take electric set-up, but is says equivilent to 30cc. I dont know the engine capacity in 2stroke, 4stroke or gas. Please can someone explain in detail.

 diy-pro 290 points

www.link look here. From what they say 1.4 glow is in the ball park of a 30cc

 diy-pro 290 points

rcgroups com/forums/showthread.php?t=1528523 but it might be under powered I would go with 1.6 rotomax

 diy-pro 290 points

What's up with hobby king blocking outside URLs to help people?!!!! **** ScrewHKnetworkadministrators. Com thumbs up if u pee on the outside of the bowl to make it quieter!!!!

 Bron 4 points

Hello, I have the same probleme with my DLUx 120HV, i have a rotomax 1.40. I have change the ESC with an DYMOND 100A OPTO and i have no problem, the DLUX ESC doesn't work correcly with this motor! I have sent an email to HK because it's not normaly.

 Spool 6 points

You two are probably having Timing problems. Just change the timming configuration on you ESC and try again. Programming Options. Battery Type: 6S~12S Forward/Reverse Soft Start LV Cut off Type (Ignore, Reduce Power, Stop Motor) LV Cut off setting (2.5~3.5v in 0.1v increments) Timing (Auto, Very Low, Low, Normal, High, Very Hgh) Switching (8,16kHz) Factory Restore Active RPM Control: On/Off (Governor Mode) Using a Soft Start might also help. Good luck!

 frogs 161 points

Use 5.5mm bullet connectors or larger. You can also use two 4mm bullet connectors in parallel.

 Tartago 482 points

3.5 a 4.5 kg. depende do area alar.

 Moggs 25 points

Yep, Leroy, throttling back as you have done sort of illustrates that the motor wanted more power, a higher C rating on your batteries may also work if the ESC will pass the power through :)

 leroy 8 points

no i think my problem was diff. i was getting to much power the motor is rated 2700 watts and i was getting close to 3000 watts at full throttel, been doing fine since i set the curve all kinds of power thank you!! getting 10 min or better fly time

 Moggs 25 points

Thanks for feedback Leroy, I'm currently setting up a couple of 1.20s, one 3D one sport scale... Handy going to school with another guys findings... The 3D may become a 1.40.. :)

 Moggs 25 points

Leyroy, when one of my motors did the cut out thing, it was a shortage of power. Battery or connections not passing enough juice... Maybe wire or the ESC too... Your problem could be different..

 manokaiser 9 points

Please ! Anyone knows if it's a WYE (Star) or DELTA configuration?

 T.rex.450 175 points

They drilled a hole in the shaft that is 4mm so you can use a 4mm screw to secure the spinner.

 Kellyann 16228 points

KaosKane listing does say ""tapped to suit a 4mm bolt to make fitting a spinner of your choice easy."" Not a 4mm spinner. So it is thread on the outside and thread on the inside. I have not used that type of spinner for years. I remember the old alloy ones that had a cap nut that went on prop shaft the a bolt on in the cap nut went up through the nose cone. I hope this helps. GOOD PICK UP

 Kellyann 16228 points

Mark any size you plane wishes or needs. With a 4mm bolt holding it is place it could be a small as 40mm or as large as 100mm. I hope this helps

 Bezold 39 points

At the maximum rated power of 2775 watts with the suggested propeller you should be able to reach 5-7 kg of thrust depending on your battery and esc so with an auw of 10 lbs you should be able to reach a power/weight ratio of around 1.1 - 1.5 to 1. This should be sufficient for just about anything short of competition flying.

 Myckey 19 points

Hi Mark, I purchased the 1.20 version with the Turnigy dlux 120 esc and it just doesn't work, all the settings are right but the esc annd the motor are simply incompatable. Motor just stutters and squeals (timing issue) if you go from anything less than half throttle to full throttle. Did your set up work? if it didn't did you find an esc that was compatable?

 mark 7 points

thanks Bezold!
Myckey... My motor and dlux 120A esc work well together, and im getting serious thrust using a 20X10 prop. However, check your battery. I notice while setting up my servos using only a 4s lipo, the set up will not work. What size battery are you using?

 Myckey 19 points

Hi Mark, I'm using a 19 X 10 prop and getting the same serious thrust, just that to get there I can only advance the throttle verrrry sloooowly, it's not the batteries, tried 8 vell rhino 3700 mah 25 - 30 C and turnigy nano tech 3000 mah 25 - 50C's, all balanced and fully charged known good batteries. Don't forget I've got the 1.20 version, now come to the conclussion that it's simply an incompatability issue, thanks for your reply.

 Bezold 39 points

Myckey I've had similar issues with smaller motors. You might try switching the PWM frequency if you haven't already. Also, a few times I've solved the issue by disassembling the motor and stripping the coils off of it then rewinding with slightly heavier gauge wire and using a wye termination instead of a delta which most turnigy motors use. Esc's tend to sense position better at higher speeds with the wye termination. Also check that the magnets are perfectly spaced and oriented N/S/N/S all the way around as either One of those issues will cause serious acceleration problems. Turnigy has a tendency to mess up magnet placement. It's understandable though if you don't want to tear your motor apart.

 Myckey 19 points

Hi Bezoldi, good reply, yo are right though I don't want to get into reworking the motor besides which these particular motors look quite difficult to get into. A better reason though is that I get exactly the same fault with a six cell set up, but, if I change the esc (and nothing else) to a turnigy 80A plush (which will only take six cells) it all works splendidly, no problem at all. This fault also replicates with no prop on at all so it isn't an overoptimistic prop that's causing the fault either. Both the timing, auto, medium and high have been tried as has the two (8khz and 16khz) frequencies with every variation thereof. I'd go with the algorithm not being compatable which can't be re written, I'm trying to get hobby king tech team to ask the desigbners what esc they used to test it with, don't mind incompatability issue if I can buy an esc that I KNOW will function correctly. Thanks for your help, it's appreciated.

 mark 7 points

Myckey, Guess what, went to test again before maiden flight and my motor stutters and sqeals too! It stutters as you begin to wind it up, then as its put under load it sqeals, like the insides spin but not the prop and bell housing. I will try adjusting the timing but am now very disappointed in this motor. I will get back to u if I can find the issue.

 stitch58 56 points

it's your esc change to a different one.

 Vinger 13 points

Check specs again, smaller and lighter than the 160 version???

 Mustafa 5 points

When I open the page turnigy 50 cc is $181 but when i wanted to buy ı* couldnt buy and when i log in with my mail and password it's price was $187 why?