I'm using the 6,5/910 in my Electron, and it performs really well. It's very smooth and really powerful. My model weighs 1810 grams (64 oz) with the 3300 mAh 4-cell Lipo, and I fly full length lines. The diameter is big as Igor mentions, but it's a 16 pole motor and is beautifully made so it won't fall apart. I use this on a 12 x 6 APC prop, and also on the Zoar 12 x 7 wood prop. I set the rpm at 9000 on the 12 x 6 and about 8500 on the 12 x 7. I've added a pic of my present Electron with the motor up front.
The IN/OUT runner series are more suited to the high-performance gliders with their narrow noses. Once again, these motors are beautifully made. Just download the RCM&E articles on Alberto's page to have a look at the insides of these motors. I've sold plenty of them to the glider folks, and nothing beats them.
O.K.......so I burnt out 2 of the 4,6/840 motors at the last world champs........mine and one of Igor's, BUT the 4,6 series is rated as a .28 glow engine and the factory warned me that this was pushing my luck on a 1920 gram (69.3 oz) model. It flew with really good power, worked until the weather warmed up and then the wires burnt out. I've learned a little bit since then, and I must say that the 6,5/910 is a great motor for models that use 12 inch props. I'm hoping that my next model is lighter by around 200 grams, and then it will be perfect for this motor. I flew again on Saturday and the air temperature was 33 degrees C (91 F). The motor felt hot but I could keep my fingers on it, so I guess that it was running within it's specs. There was zero smell of burning anything etc. and I flew 3 times in the heat. Last year, I stuck an Eagle Tree temperature sensor directly onto the windings, and in similar weather, I measured a maximum of 48 degrees C after the flight. I then blocked up some of the cooling holes in the model's nose to see if they were doing anything, and the temp went up to 68 degrees. The flights consume around 1800 mAh from the battery for a flight of 5' 30 secs. I'm using a 60 amp esc with the governor speed setting from my own timer gadget.
I would hesitate to recommend the larger IN/OUT runners for stunt models, although the smaller ones should work well on .15 to .25 size stunters. I do have some of them and they like little jewels, but I have not had time to test them in any models yet. The outer casings do add weight and as Igor says the windings have a higher resistance than some of the other motors like the AXI. The 6,5 and 8,0 however, will work very well. I use the 8,0/680 in my R/C Hanger 9 Twist 40 and it will turn a 15 x 8 prop no problem (too big for the Twist's landing gear but goes vertical out of my hand!). This will work well on large stunters with 13 to 14 inch props and 5-cell Lipo's. The work quality is as good as anything from AXI or Hacker.
Keith Renecle
Topic: MVVS Electric Motors (Read 793 times)
