went with a exceed 300-1380 85w 12 amp esc, 100ma 7.2. What size prop should I use. went with the e-flight timer. How long of a flight should I put on the battery? I was told that you do not run them down all the way. the weight is 8 oz with out the battery mount and little motor mounts, they did not come with the kit. I think that the kit should have everything you need not just a cut out in the bottom of the fuse and then call it a electric. If i knew I could have got a different collor and made to cuts. Well live and learn

Steve,

100mah or did you mean 1000mah?  100 might be rather short flight times.  I use a Rimfire 300-1380 but on 480mah 3s, 11.1v, so I can't give you the exact info you are looking for.  I use an APC 7x4 or 7x5.  I can get 4-5 minutes per charge.

Paul

tryed to fly the baby clown today, did not fly well. Seems to have no power. tryed a 7-5 would fly but no power broke the prop, tryed a 6-4 would hardly stay in the air tech it only turning 9300 rpm. is this low. any body have any idea's

went with a exceed 300-1380 85w 12 amp esc, 100ma 7.2. What size prop should I use. went with the e-flight timer. How long of a flight should I put on the battery? I was told that you do not run them down all the way. the weight is 8 oz with out the battery mount and little motor mounts, they did not come with the kit. I think that the kit should have everything you need not just a cut out in the bottom of the fuse and then call it a electric. If i knew I could have got a different collor and made to cuts. Well live and learn

It sounds like you are using a 2S battery.  If the voltage is 7.2V and the rpm rating is 1380/V the max RPM would be 1380  X 7.2V = 9936 RPM max.  So the 9300 RPM you are getting is about correct for the exceed 300-1380 85w 12 amp esc, 100ma 7.2 you called out above.  I too am new to all this but judging from the other posts you need a 3S battery. Others are saying that a 3S is 11.1 volts.  1380 x 11.1V = 15318 RPM.  The 3s battery should yield 14500 RPM or so.  Also as pointed out do not exceed the 12 amp limit of your speed controller.  By the way the bigger the prop the higher the amps.  So start with a small prop and work your way up.  Regrading flight time - hopefully your speed controller will cut off if the battery voltage gets to low.

By the way Tower has a cheep vot/amp meter

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXZFA7&P=7

Thanks tryed a 11.1 and it turn 13500 that should be ok. thanks Should have got the higher kv motor, first time with electric, hope the other motor for the rc plane will work

Steve

Thank John. I did not know what to do buy a higher kv motor or go to higher volts. was thinking about wieght the batters I have know are 1000ma would have to drop down to 500ma with a 11.1 what do you think I should do. I have 3 of the 7.2

Steve,

I am retracting my comments about running the Alpha 300 on a 4s battery. I did some testing today with an APC 6x4EP, at ¾ throttle I was at 170 watts input power, twice the motor’s rating. And the motor did not sound so good. This does not match the simulations I ran, but the results for a 3s battery are right on. It looks like the max prop/battery is a 7x5 and 3s. I was getting about 9500 rpm static and the prediction is for about 12K in the air. I was at 90watts at full throttle. It might handle a 7x6 but I didn’t test it. As I get the time I will continue to experiment with 4s.

John

I have and use the GensAce batteries, they are great. Just ordered a few more for my Vector.