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E-Flite Power 60 vs Axi 4120/18

Old 09-03-2007, 06:34 AM
  #1  
sbritton
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Default E-Flite Power 60 vs Axi 4120/18

I have a Kyosho Kelly F1 Racer currently running a E-Flite Power 60 with a 15x8 prop, 6S1P Li-Po and Castle Creations 80. Flies nice, but just not fast enough for me. I would guess around 55mph. I would like to get closer to 90+ mph.

I want to try a couple of different avenues and wanted some advice:

1. Keep the Power-60 (400rpm/kv) but use a 14x12 prop.

--or--

2. Put in an AXI 4120/18 (515rpm/kv) but prop I assume would have to be more like a 14x8.

--or--

3. Open to suggestions for a different motor combo.

BUT...I can't change the batteries...I have too many 6S1P's to start messing around with bigger packs.

Thanks...
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Old 09-04-2007, 03:59 AM
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Matt Kirsch
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The Power 60 motor is capable of handling more power than the AXI, and if you're only running a 15x8, you're really babying the motor. It'll go to at least a 15x10 out of the box. A 14x12 may give you more pitch speed in theory, but may not provide enough thrust to accelerate the plane to that higher pitch speed. Wouldn't hurt to try it, though. It's far less expensive than any other power system upgrade.
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Old 09-04-2007, 04:10 AM
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sbritton
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Default Prop ideas...

So I started with a 15x8 for the 1st flight to make sure I had some power to get out of a situation should it come up.


In theory, what would be the best prop for the Power-60 that would give me maximum top speed? Would 15x12 or 14x14 or even 15x14 burn something out?
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Old 09-05-2007, 07:15 PM
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Try running your power 60 on 7s. Prop it to stay below 50 amps.

John
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Old 09-05-2007, 07:51 PM
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rcers
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You simply need more pitch - 8" pitch is simply not enough. You system should be fine - just beef that up. You should shoot for 12"-14" in pitch.

Do you have a watt meter? It is a MUST for equipment of this size and expense. Keep the amps within Motor/Battery limits (your ESC has plenty of overhead) and off you go.

I sometimes test as many as a DOZEN yep 10-12 propellers on a single plane before settling on one. All of that depends on your flying style, how hard you push your equipment and many other factors. Don't be afraid to test - but MAKE SURE you check amps on the ground first - so you know you are not going to cook something.

Mike
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Old 09-06-2007, 11:39 PM
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sbritton
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Default 41 Amps but only 922 watts

Okay...I stuck with the Power60 but prop'd up to a 14x12. After a really nice flight pushing over 100mph...the in-flight data recorder by Eagletree showed 41amps max (good) but only 922 watts on ~9000rpm on a 6S1P.

The battery was fully charged...so no issue there. That motor in another plane got well over 1100 watts several times. So do I need to revisit the prop again?

Any ideas on the relation of a prop diameter or pitch is to the watts output given everything else is equal. In otherwords, can we tell from the data I need a bigger or smaller prop?
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Old 09-07-2007, 03:00 PM
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rcers
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Originally Posted by sbritton View Post
Any ideas on the relation of a prop diameter or pitch is to the watts output given everything else is equal. In otherwords, can we tell from the data I need a bigger or smaller prop?
You bet - the prop diamater and pitch both create more load on the motor. Electric is kind of odd - the motor will try to spin the prop at its intended kV until it cooks trying.

So as you increase the load - the amp draw and watts go up. They are related in the following

Watts = Volts x Amps

So try a 15x12 prop on the ground and see what you get. But in the air is where it really matters. You must test on the ground make sure you are not going to cook anything and then get it in the air to test how you like it.

Sometimes I like the lesser loads - and the plane flies better - go figure.

All trial and error - but you can go with a much higher load. That motor is well capable of 1200+ watts......so it is loafing right now!

Mike
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Old 09-10-2007, 05:44 AM
  #8  
sbritton
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Default AMPs...what are they?

Okay...stupid question. I assume AMPs are the draw/load on the system. So as it has to work harder, the AMPs increase. Rights?

If that is the case, can I assume, that by increasing the prop Diam/Pitch until I get to the max AMPs of the motor means that I will hit the limit of it's capabilities?
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Old 09-10-2007, 12:01 PM
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All correct.

John

Originally Posted by sbritton View Post
Okay...stupid question. I assume AMPs are the draw/load on the system. So as it has to work harder, the AMPs increase. Rights?

If that is the case, can I assume, that by increasing the prop Diam/Pitch until I get to the max AMPs of the motor means that I will hit the limit of it's capabilities?
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