Originally Posted by Tom K.

We bought it from Aero-Models and Frank was getting 3000 watts on the 20x13 and over 3600 watts on the 22x10 Xoar. If you have any doubts about the motor you can call Mike at Aero-Models.

--Tom K.

The hacker web site does show 2200 watts. But hands on testing trumps written specs so what I want is for 3000w+ to be dead on. This could be the power system I use next year. I've always considered anything this size would be gas but I like the the ease and consistence of electric motors. So I am seriously considering electric. Until asking today I hadn't found a motor that could fit what I was looking for. I went down the whole list of Hacker A-60 motors. But I was using the watts ratings from their site.

what are the educated opinions on a hacker or otherwise for +-3 kW on 12s 4000-4400mah? ideally 22-25 oz, 20x10-22x10 prop.

there seems to be one Q series that will fit the bill, but hanging $450 on the front of a $450+- airframe is rough!

If you go over to the 78 thread you will see all reports on this motor on 10s with a prop bigger than a 20 inch going over 3000 watts. I'll try to get some video evidence soon since I know that seeing is believing.

hacker regularly under rates their motors. I've had three run for an eternity, over spec, at high but not reasonable temps. naturally your mileage may vary.

Originally Posted by Irg

what are the educated opinions on a hacker or otherwise for +-3 kW on 12s 4000-4400mah? ideally 22-25 oz, 20x10-22x10 prop.

there seems to be one Q series that will fit the bill, but hanging $450 on the front of a $450+- airframe is rough!

We have the Q80-7M 10S in a 50cc size spinning a 24x10TH Mejzlik to 6400-plus RPMs and 4400 Watts. That's a 35 oz motor and the Q80-8M, which is a 12S motor is going to add more weight because of the added cells. I'd say this is way too heavy for this airframe while trying to keep it's great flight characteristics intact.

So far, the Hacker A60-16M 215Kv, the Scorpion 225 Kv, which is not made anymore, and the AXI 232 or 259 Kv, are the leading 3000-plus motors for this plane, IMO. The reason we went with the 215Kv was so we could prop up to 21 and 22 inches without over-Amping.

The Q80 -- 7M on 10S or the 8M on 12S -- will go anywhere a 50-60cc engine will go, but not the best candidate for this airframe.

Originally Posted by Irg

what are the educated opinions on a hacker or otherwise for +-3 kW on 12s 4000-4400mah? ideally 22-25 oz, 20x10-22x10 prop.

there seems to be one Q series that will fit the bill, but hanging $450 on the front of a $450+- airframe is rough!

Amen to that statement!! A bit over priced to say the least!! Why not Motrofly 5320 300 series motor for half the price?

I'm a big fan of Motrolfly, but the 300Kv is not a 10S motor and will never handle a 22 prop on anything more than 6S.

The Hacker A60-16M is a 10S motor, can handle the 22 prop at under 100A, and is only around $30 more than a motor that can't.

And the really expensive 28 pole Q-series motors are not right for this plane. I think the Q's are so expensive because they are hand made in Germany.

So, what do you think of the Turnigy RotoMax 50cc Size Brushless Outrunner Motor?



Enough for a 91"?

Originally Posted by LoneWolfRC

So, what do you think of the Turnigy RotoMax 50cc Size Brushless Outrunner Motor?



Enough for a 91"?

Nope. It's a 10S, 172Kv motor, and the suggested prop is a 24x12. At about 80% KvE, that's about 5165 RPMs, which is hardly enough power for the 78, and it's 4 oz heavier than the Q-80 motors. Even at 90%, it's not enough. A 174Kv motor is definitely a 12S motor, so you'd have to take a $192 gamble on it and wonder why they list it as a 10S motor.

Originally Posted by Aeroplayin

If you go over to the 78 thread you will see all reports on this motor on 10s with a prop bigger than a 20 inch going over 3000 watts. I'll try to get some video evidence soon since I know that seeing is believing.

I haven't decided which way to go yet gas/elec. so this is really good info for me. I do like Elec. The only real draw back is the shorter flight times. I have found that 6-7 minutes of 3D isn't bad so I'm looking pretty hard at it.
I need to find that 78" thread.
Thanks Aeroplayin

Kind of late to the party on the power to HV servos discussion... but I been running my hs-7245's at 8.2v regulated from a Castle 10 amp BEC for about 75 flights and loving it.

Originally Posted by Aeroplayin

I'm a big fan of Motrolfly, but the 300Kv is not a 10S motor and will never handle a 22 prop on anything more than 6S.

The Hacker A60-16M is a 10S motor, can handle the 22 prop at under 100A, and is only around $30 more than a motor that can't.

I am a fan of Motrolfly too (mainly because of Ken's service) and a $30 Rewind on the 5320 would be a 10s option... Personally when I get into this size it will be on 12s and around 190-200kv. Aero... can't wait to see some numbers and flight videos from you guys.

Originally Posted by bryansifsof44

Kind of late to the party on the power to HV servos discussion... but I been running my hs-7245's at 8.2v regulated from a Castle 10 amp BEC for about 75 flights and loving it.

Thanks...so do you recommend I do the same? (I have mine set up at 7.5 volts).

P.S. Anchorage is a beautiful city, I went up there once about 9 years ago.

I grew up in bush Alaska... Anchorage is where I live now mainly for work to support my flying. Anchorage however is a nice city... if you could handle a little cold in the winter. No extreme weather systems (ie: hurricanes, tornados, lightning, monsoons), just a shaker once in a while.
As far as 7.5 verses 8.2v... honestly I can't compare since I've only run these servos at 8.2v. Like Cody said they will be faster and more powerful at the higher voltage tho.

Originally Posted by Aeroplayin

I'm a big fan of Motrolfly, but the 300Kv is not a 10S motor and will never handle a 22 prop on anything more than 6S.

The Hacker A60-16M is a 10S motor, can handle the 22 prop at under 100A, and is only around $30 more than a motor that can't.

And the really expensive 28 pole Q-series motors are not right for this plane. I think the Q's are so expensive because they are hand made in Germany.

Why not call Ken at Subsonic Planes and see what kinda wind options he can come up with? I'm sure he would want the business and could probably come up with something that will rock that plane. Plus you will have it in 4 days. I have the 4325 310kv running 8s on my 70" EXP and it pulls from a hover at a little over half (a few clicks as I run the ratchet style throttle. If I punch it from a hover it takes the tail a few seconds to catch the plane.

Originally Posted by Liberty10

I haven't decided which way to go yet gas/elec. so this is really good info for me. I do like Elec. The only real draw back is the shorter flight times. I have found that 6-7 minutes of 3D isn't bad so I'm looking pretty hard at it.
I need to find that 78" thread.
Thanks Aeroplayin

Here's the 78 thread:
https://www.rcgroups.com/forums/show...53557&page=178

and here's the power thread:
https://www.rcgroups.com/forums/show...33887&page=182

It took a while to get through the 78 thread because there are many posts with some really good information, but it's worth every minute if you are even considering the 78 Extra. There is also some power reports that make less sense so you have to be careful too. The bottom line is that Watts, thrust, and airspeed vary independently, and the idea is to find a motor that has the perfect balance for your type of flying.

The power thread is something you can jump in at any time because no one really expects anyone to weed through the tech stuff. We hammered out some really good data to this point and it's better to just ask.

Originally Posted by jw357_23043

Why not call Ken at Subsonic Planes and see what kinda wind options he can come up with?

I did, and we discussed options, but the 53’s are light for 3D with a 22 inch prop on 8S, so 10S, even at a lesser wind, with a prop size over 20, is not a good idea, IMO.