Seriously though - check more into the electric forums both here at RCU and their sister site www.wattflyer.com which is dedicated to electrics. The REALLY will understand your problems better than us nitro guys.

Thank you Bruse. Once again you have all the answers for me. Yes I read the above links and that is exactly what I installed in the plane, so now I'm think this motor is the issue. I'm calling Hobby-Lobby as I'm writing this to see if they will exchange the motor for me. []

So now Hobby-Lobby is telling me that the 7.2v Batteries are to low voltage for this motor WHAT!!! the motor is Graupner: Speed 400 Motor , 7.2V Thrust 8Oz. Volts 8.4 Gearbox 2.33:1 it says it will work with 7.2V. Now he wants me to put a 10cell NiHi or 3cell LiPo with a 12X6 prop. ????? So I made a 10Xaa battery pack and it proved to be no better. I put it on the charge to top it off, will see. I don't think it's going to make any different. This is so hard. I know one thing, I am learning allot. Also costing me allot for these lessons. So I still think it's the motor, any ideas ?

Now you know ONE of the reasons I fly nitro.

Bruce, I posted on Watts. Yes I understand now. It's just our club lost it's Nitro field and we only have a Electric at the moment. I should join another club but I hate to leave these guys. Could the differents between 12V and 7.2 and 8x6 and 12x6 create enough power to move this plane> I still think theres something wrong with the plane. Could the ESC be wrong, it's for BRUSHED Motor, this Graupner: Speed 400 Motor is Brushed? Right? [&o]


Cloud Ranger 24oz. A “Graupner: Speed 400 Motor , 7.2V Thrust 8Oz. Volts 8.4 Gearbox 2.33:1 Battery: 7.2v 20C 1550mAh using a Electrifly C-12 ESC for Brushed Motors Prop: 8X6, "These are motors that consume from 35 to 75 Watts and about 6 to 10 Amps"

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXKBF3

It should be OK for your motor and the planes says a speed 400 is adequate for power. Beyond that I don't have electric plane experience and don't feel comfortable saying: [sm=thumbs_up.gif] or [sm=thumbs_down.gif].

8oz is not a lot of thrust, and is more suitable to a light foamy.

A "25oz" plane is a stretch, it would have to be a lightly loaded trainer that doesn't need a lot of thrust to pull it along.

Usually with gear boxes you end up with large diameter props with high pitches, to compensate for the slow RPM rate produced by the gear box. The offset to this is that because of the gear box, a rather wimpy motor can produce consistent RPM's with the larger prop which equals more power.

What plane are you flying?

Also the pictures help but it would be better to see a pic with the pinion gear showing to show us how the motor is retained.

BTW: There are also drop in "inrunner" motors that produce more power too.

OK, OPJose, lets say I just ditch the whole setup and start over, could you put something together for me using the 7.2v LiPo batteries since I have three of them. First is 10C 7.4V 1800mAh 2cell, next 2 cell 7.4v 1000mAh LiPo mini Battery, and the third 20C 1550mAh 7.4V 2Cell, I also have a 10xAA 1000mAh 10cell. So knowing I want to use them, the Plane is a "Cloud Ranger" by Herr coming in at about 22 to 24 Oz, with about a 10 oz wing load.

One easy way to do this is to go to the Electrifly motor configuration page.

Click here: [link=http://www.electrifly.com/config/]Click me![/link]

For a 7.2 volt configuration you can go either inrunner or outrunner ( try both to see, though the inrunner will require a gearbox ).

Try a 12in prop, ( you can also try with a 14" prop just to see what the calculation comes up with ) and add an ounce or two to your plane's weight to be safe. Do figure out what your max prop size can be by putting the plane level with the ground and seeing how much clearance you have from the prop line to the ground, then subtract at least 2" for a good estimate.

Select "Sport" instead of "trainer" for the plane type so you are assured adecuate power, as you can ALWAYS throttle back.

I find that the recommendations made are pretty good and have worked very well for me.

[8D]OpJose thank you that site is perfect. Okay for the beginner stupidity. I figured out what was wrong with my whole setup. (drum roll please) The pinion gear was slipping the glue gave out. So I re-glued with CA and activator. took nylon ties and strapped the motor in place. I never like the idea that the motor was just pressed in place. Tomorrow we fly and I will post as to how well. We still might have to change the motor, but lets at least give this configuration a shoot. Thank you all for helping. This is not an easy hobby by any standards. I have never done so many task to complete something. i just balanced the whole load and the battery can not be place where the plans say to, so shoved that up right behind the motor. Still had to add two more oz. Well wish me liuck, the journey may not be over yet. [8D]

That motor should fly the airplane.

Okay, took her out this morning and it sure wanted to fly, but just not enough thrust. I'm still thinking I have a bumb motor, going to try and get Hobby-lobby to take it back.