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Scorpion Power Scorpion Power
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MSH Protos, Mini Protos
› PROTOS 500 Motor Choice
07-13-2008 03:33 AM  9 years agoPost 21
Kepler

rrNovice

Melbourne Australia

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JCos,

I never said the Cora wouldnt work. In fact it looks like the the perfect motor for the job on 6S and 2500 rpm

But OICU812 was talking about 6S and up around the 3000 on the head. For this job I am saying a 200 gram motor will be needed if you still want the motor to work within its design peramiters.

A Z20 980kv on 6S works very well if 3000 rpm is your thing.

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07-14-2008 05:56 AM  9 years agoPost 22
ArtK

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Temecula, Ca

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Not sure if I agree about the 200 gram motor

I have been running a 130 gram Z15 on my trex 500 on 8s and it is a monster and stays cool every flight. 200 grams is way to heavy for this class of heli. I run a 270 gram 1907 on my logo 600. I have pulled over 4.5hp with it. The most powerfull setup I have owned and being a smaller motor for the class does not limit it at all.

Anyone know where to get this Kora motor?

Thanks,
Art K.

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07-14-2008 06:07 AM  9 years agoPost 23
ArtK

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Temecula, Ca

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Gearing

JKos,
I just noticed you are using two different gearing options between the Kora and the stock. I think going overpinion is the reason why your amps are lower. Your no load current will go up if you spin one motor faster then the other. That could be the difference in efficiency and heat. I think the stock motor does like to run slower as well. It seems to have porblems with induction losses. I think this is one motor that likes to be in the 4-5s RPM zone. You can run higher voltage you just need to govern it down a bit more. Either way it sounds like the 18T pinion is where you want to operate and 2400 rpms with the stock motor.

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07-14-2008 08:47 PM  9 years agoPost 24
byHISgrace

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Knoxville, TN

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How do you guys think a Scorpion HK 3026-1200 and 4s 4100 Lipo do on this heli? What pinion for 2500-2700 headspeed and then how many amps will it pull, in your best guestimante. Thanks. Matt

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07-15-2008 01:12 PM  9 years agoPost 25
Kepler

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Melbourne Australia

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I have been running a 130 gram Z15 on my trex 500 on 8s and it is a monster and stays cool every flight. 200 grams is way to heavy for this class of heli. I run a 270 gram 1907 on my logo 600. I have pulled over 4.5hp with it. The most powerfull setup I have owned and being a smaller motor for the class does not limit it at all.
Wow, thats a tiny motor for a heli that must be close to 1900g. Z15 range is rated at 40A 6S and 900W max. The 1907 is rated at 1200 Watts and you are throwing in well over 3000 Watts. So what is your secret

I disagree a 200g motor is not too heavy for this class of heli. I fly this motor on 5S 3300 mah and all up weight is only 1600g. I get a safe 7 minutes of hard flying at around 2400 to 2500 rpm and the motor comes down at barely above ambient. These is so much left in this motor its a joke. If want to consistantly draw more then a 1000 Watts as I am sure OICU812 does with his extreme 3D you just have to carry a decent amount of copper.

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07-15-2008 02:44 PM  9 years agoPost 26
ArtK

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Temecula, Ca

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Weight

My all up weight on the 500 on 8s is 1750grams. I have well over 100 flights on it. I hit 45 amps almost every flight on 8s. Those ratings are very conservative. Motor still works great. My logo is about the same. Motor temps on the logo are about 160f so I know I am at the limit but the z motor is cool to the touch after every flight. Yes even a 400 gram motor will work but the point is to go the other way. You want the smallest motor that will do the job without overheating while staying efficient 85-93% is good. I know the market doesn't have Many choices for the Protoss so you get what you get anyway. I think z power does have an 820kv of motor in that size. Probably perfect for it. Steve also has some motors that will work that are more efficient and light. And if you want to know no load at operating rpm for my zpower is 2 amps. R is .045ohm. Eff is about 85- 87% all around. It is good enough to where the difference between high end and the z is trivial given the weight savings of over 75 grams to stock for the rex.

yes I do agree if you are pulling over 1000 watts all the time I would get a big motor but most bigger motors in this class don't give you more copper just more weight higher r and higher no load.

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07-16-2008 06:52 AM  9 years agoPost 27
OICU812

rrMaster

Edson, Alberta,​Canada

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When I can get my mitts on a Kora 15-14 and appropriate pinion etc to match up to 2800+ I'll give it a go. If it melts no worries .

...Once upon a time there were Nitros, flybars and frequency pins...

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07-17-2008 06:10 AM  9 years agoPost 28
ArtK

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Temecula, Ca

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That motor does look good

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07-17-2008 01:34 PM  9 years agoPost 29
Carbon Copter

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USA

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I only see Kora 15-12 and Kora 15-16 --the -12 seem to be rated close to the stock motor. Where can you get a Kora 15-14 and is this a better choice?

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08-30-2012 01:33 AM  5 years agoPost 30
Freeskiken

rrApprentice

Edmonton, Alberta,​Canada

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Kora 15-14 Motor

Anyone know how this motor worked ? Looking at a replacement motor for a Protos 500.

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09-10-2012 09:52 PM  5 years agoPost 31
dennis052

rrApprentice

San Diego, CA, USA

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Where can you buy this "old" Kora Motor? Mine burned out after 1 year of flying. It runs cooler than stock but I don't think it has good power like Scorpion. However, Scorpion runs very hot so I am using Z power Z20A-850 now, so far so good.

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09-10-2012 10:03 PM  5 years agoPost 32
Freeskiken

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Edmonton, Alberta,​Canada

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Thanks, I am using the stock Scorpion motor. Looks like a good replacement. How long have you been running the Z Power Z20A-850 ? Do you have a carbon frame ? Do you have to sand the frame ?

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09-14-2012 09:42 PM  5 years agoPost 33
dennis052

rrApprentice

San Diego, CA, USA

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I have been running Z power motor for few months already. It still has same power and cooler temperature after flight. Yes, carbon frame and I did not sand the frame.

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