nla_pes

Hi Guys
At my usual garage sale hopping I came across a MX450 never removed from box. This is a completely assembled Heli except for a motor and electronics. I bought it for a very good price. I have everything I need but: it calls for a slightly different motor than I have. Can any one give me a comparison between the Electrifly Ammo 28-45-2700 KV called for in the MX450 Manual and the Scorpion HK 2221-12 I have. The specs don't line up. Any info will be appreciated.

osterizer

The Scorp has a lower Kv spec, but only by 120RPM, and a lower rated power output, but still plenty of power for the MX450- you have to fly the MX hard to use more than 400W. On the other hand, even at 250-300W (pretty spirited flying), the Ammo motor tends to run pretty hot, while the Scorp will stay comfortably warm on a 12-13T pinion. I personally think the Ammo is a very good fixed wing motor, but the Scorp is better for helis.

blvdbuzzard

I have a bone stock MX450SX, it is all pretty red aluminum and carbon. She is a smooooth ship. She is not the fastest, most 3D, ship around. She does fly really well. Stable and a joy to fly. I am running the $12.00 325mm carbons from Deal Extreme. I am using an Anon inrunner BL motor with heat sink. Head speed is around 2200 and just sits there looking good.

Sorry can not help with the motor, the scorp should be fine.


Dru.

AirmanBob

My Feedback: (14)

My son runs the Ammo 28-45-2700 with an ACE 45 amp ESC.
He use's Venom 2100 20c 3s lipos. Rated for 42 amps.

It's the best flying heli I ever saw. It can go from dead stopped
on the ground to a 50 feet hover in the blink of an eye over and
over again. No strain...

He flys around for about 8 minutes and still has plenty of power
to safely land.

The motor is only slightly warm to the touch and the Lipo and ESC
are barely warm too.

That motor (Ammo), is rated for 500 watts. So its not really working
all that hard. It's truely an awesome, powerful motor. Very nice
craftsmanship too...

I'm gonna put my Medusa flight recorder on his heli and get some
real time readings on it this spring weather permitting.

As for a the Scorpion motors... I don't know... it would be nice if a
guy could afford to have one of each to test. I really doubt it could
be as good a motor as the Ammo.

These are my opinions based on actual experience with the Ammo.

Good Luck and let us know how it goes....

AB

osterizer

Bob, as always- your son is the only one I know of who can't heat up the Ammo in the MX. I like the motor a lot- I have it's big brother doing about 600W sustained in a hotliner, and the airplane is absolutely ballistic -but in the MX, it's hard to keep in a decent temp range if you're doing more than hovering and circuits. The Ammo will push 180 degrees F in the same application that the Scorpions are running 120 to 130 degrees F. It's a good fixed wing motor, but it doesn't compare well in a helicopter.