I will first give you the setup I'm using.

Original gearbox that comes with it
E-flite Hacker 4900kv
E-flite 20amp speed control the is recommended for this motor
Thunder Power 3 cell 1350 lipo's
GWS 11-4.7

The problem I'm having is that it flies like it has no power really. I have to fly it around 3/4 throttle to get any performance out of it at all, which drains the pack pretty quick. It also is torquing to the right at the higher throttle. I have put carbon fiber strips on both sides of the motor mount to minimize the torque, but it doesn't seem to have helped. I know this is a good flying plane, so what do I need to change to get the flying performance out of it??? Is the prop to big for it? Maybe I need to drop down to a 10-4.7? I'm not sure, but for now I'm a little disappointed. This is my first electric, so I need your guys help.

Thanks

Keith

I have a similar setup, same prop, ESC, and similar battery, and mine's a rocket! I have the 4100 Kv EFlite and the V1.1 gearbox using 6.6 gear ratio... I don't know if the higher Kv motor is the cause of your problem or not... What pinion are you using?

And -- how many amps are you pulling from your battery? If I recall correctly mine is putting around 10 amps with the 1147 prop...

I will try to answer both your questions. I counted last night and it was a 10 tooth pinion. As far as the amps, I don't have the meter to measure it right now, but when I had put it together I took it back to the hobby shop and they measured it for me and I think it was around 7-10 amps continuous and 18 or 19 amps burst. Can't remember for sure. I will have to take it back and get it measured again.

Thanks

18+ amps on a 1350 3 cell seems like a lot... Is you pack rated for more than 15C? Most packs, especially the cheaper ones, are rate at 8-10C which is 10.8 to 13.5 amps on the pack you listed...

I think my memory has failed me for sure. I will have to take it back to get it measured again. I do know that we proped it as close to the ratings of the pack and motor as we could. I can't remember for the life of me what the measurements were though. I will come back with those.

Hey now,
The little Hacker motor isn't going to work wqell in this set up. I had one and running it with a simular set up, I burned the motor up very quickly.
7 to 10 amps is the max for this, thirty seconds of 18 amps *will* fry the windings.
Get either the Himax or E-flite motor 2015-4100 Himax = 4100 E-flite motor, 2025- 4200 Himax = Eflite 4200 motor. I'm using a himax 2025 4200 with the stock E-flite box with a APC 12-6 sf, and drawing around twelve amps full tic. This is more power than you'll ever need.
The Hacker motor is pretty, but I'm very disapointed with it...
RobII

So basically your telling me I wasted $70 bucks on the Hacker that's supposed to be so great. So what would the Hacker go in. I have been looking at the new E-flite Yak. Would that be a good match for it? So what is wrong with the Hacker 4900kv? Why would a another moter of the same type, such as the Himax or the E-flite Park motors outperform it by alot. I mean this is literally the worst flying plane I have flown as far as power goes?

I've got the e-flite 370 5400 in mine and it's got more than enough power. I've also tried the himax 2812-850 outrunner and that has plenty of power also. I've used the 10x4.7 and 11x4.7 props with no problem. Either prop works fine however I get better run times from the 10x4.7. You should be able to use your existing ESC with either motor. The e-flite is about $47 and the Himax is in the $63 range. I like the Himax better. It's very quiet and about 50% more efficient. I can get almost 20 minutes from a 3s1p 1450 li-po battery.

I have a HiMax 2812-0650 in Efilte Ultimate. I am not a fan of gear boxes, more to break and they are louder than outrunners. I get 20+ minutes of mixed flying with a 1320mah lipo running an 11x4.7 APC SF prop. If I had to do it again I’d get a 2812-0850 though. The HiMax outrunners are relatively inexpensive, I think under $60, and come with 3 different mounting options including a stick mount so it screws right onto the Ultimate.

I don't get it either. Usualy Hacker is the standard, but in this case they've dropped the ball, heck, they handed it off to the other team...
RobII

Was that the recemonded setup?

I got some measurements for you guys today so that you may be able to better help with a little more info. I took it to my hobby shop and we first weighed it. It came in at 14.2 ounces. I had a problem with the plastic gear box so I got the MPI aluminum gear box set. Seems a little mor efficiant with it. With an 11-4.7 it is pulling 14 amps at full throttle. Looking at my instructions for the Hacker motor it says it is the E3-49 4900kv model. Continuous Amps: 7A Peak Amps: 12A. Is my current set up wrong for these measurements if it at 14amps now? I don't want to ruin my motor. Do I need to go to an APC as well? Any help you can give me would be appreciated.

Thanks,

Keith

It sound like you are too much prop. Try a 10X4.7 and measure the current again. It sounds like you are pull too much current for the motor that you have. My E-Flite 370 4100Kv pulls much less current with an 11X4.7 prop...

for maxium outside 3d 50%throttle hovers The first option will be the High Power Motor Setup. E-Flite recommends using the included 6.6:1 gearbox and 10T pinion gear, along with the included 12 x 6 propeller"(i use the 11x8 with this setup)". You just need to purchase the E-flite Park 370 Brushless Motor, 4100 Kv (EFLM1000) and the 3-cell 1200 – 1320 mAh Li-Po battery and you will not be disappointed. This is the most powerful setup option for the Yak54F and will give you the most power between the three options.
that hacker motor has too much load on your esc and batt the above combo
is what i use on the tribute and yak 54f flys for 15 to 20 minutes on 1320 and hovers at 50% throttle thats all i wanted in life and the 4100kv w/loud 6.6.1 gearbox &20amp esc made it happen

http://www.horizonhobby.com/Shop/ByC...rodID=EFLM3005
Says in their own words to use the included 12x6 prop for max performance or a 10x4.7 for all around flying. Couldn't hurt to try the 12x6, just do a short flight, keep full throttle to short bursts and come down to check temps, supposed to be less than 220F. I had the ultimate and it would hover at 1/2 throttle with the park 370 4100kv using the stock 12x6 prop, plenty of power. Full throttle would climb straight up to about 300ft in like 6 or 7 seconds. Could cruise around at 1/4 throttle and maintain alititude. Sounds like what you have should fly similar, maybe a little less performance, but not like what you describe. How is gearbox mesh? maybe too tight? Loosen motor and pinch a piece of paper between the gears and then tighten motor, this will give you about .003" of clearance. Using good size wire from battery to ESC? Any experienced electric guys in the area? Maybe you got a bad motor or ESC? If you know someone that has one, maybe try a castle creations pheonix 25 ESC for a quick test? Just some things to try. Just built the Yak, it and the Ultimate have about the same power requirements and weight. If you get really desperate, I'll trade you one of my Park 370 4100Kv's with about 6 flights on it......