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Old Nov 06, 2006, 07:54 PM
Build, Fly, Crash. Repeat
Tampa, FL
Joined Oct 2005
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E-Flite 450 or 480 Outrunner

I have both sitting in front of me, but which to use? I am working on a new Ultrafly 300S Extra (~20oz)(35" Wingspan) which I want top speed more than anything... specs of each are:

Park 450 BL 890KV
Recommended props: 9x6 to 11x3.8 Slow Flyer or 10x5 to 12x6E
Weighs: 72g (2.5 oz)
Current rating: 14A continuous, 18 Burst

Park 480 910 KV
20A continuous, 25 burst
Weighs: 87grams or 3.1oz
10x6 - 12x6 Prop

I know most of these outrunners can be pushed harder than this with proper airflow, the dozen or so 370s i have can really take a beating.

These KV's look low for something speedy right, what is obtainable in terms of top speed?

edit: battery will be a 3cellTP2100
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Old Nov 06, 2006, 07:57 PM
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United States, CA, Tehachapi
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Great question. I'll be waiting on a good answer also.

I have some thoughts, but don't want to muddy the water so to speak.

Frank
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Old Nov 06, 2006, 08:17 PM
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Sydney, Oz.
Joined Mar 2006
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The 480 is used by a lot of people in the Katana Mini at around 28oz on an 11x5.5E.
I'd say the 450 would have plenty of power for a 20oz plane.
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Old Nov 06, 2006, 08:22 PM
Build, Fly, Crash. Repeat
Tampa, FL
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Up to what point though can I equate power to speed? Sure these guys could produce lots of thrust but 3d isn't my goal? The LHS initially gave me a 450 for the model so yeah you're right it should
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Old Nov 06, 2006, 08:32 PM
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Port Fairy, Australia
Joined Jun 2005
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If you want off tap unlimited 3D go the 480, if you want nice solid performance for a 1/2 oz weight saving the 450 is plenty. The other option is to go the 480 and simply deprop it a bit until you want the extra performance later More Power = more fun

Tim
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Old Nov 06, 2006, 08:53 PM
Sir Buildsalot
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Stockbridge, GA
Joined Nov 2002
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Quote:
Originally Posted by IBWingnutz
Park 480 910 KV
20A continuous, 25 burst
Weighs: 87grams or 3.1oz
APC 11x5.5E

battery will be a 3cellTP2100

I am flying this setup on my Eflite Mini Ultrastick (24oz) , TP prolites of course TONS of power at 20amps WOT. Will go straight up till I say stop. Very good top speed too.

I may step up to the 12x6E and see what that prop does for me, got goosy bumps thinking about it

I think there's only a $5 difference between the motors, HECK! go for the 480, you'll have power in reserve .

My .02 worth
MOG
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Old Nov 06, 2006, 09:26 PM
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If you want speed, go more pitch, less diameter.

And if you really want speed, you should use a higher kv motor.
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Old Nov 07, 2006, 03:38 AM
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Italy, Friuli-Venezia Giulia, Fontanafredda
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IB

I fly my 23oz MUS on the 480/910 with an APC 11x7E for great speed and unlimited vertical. Of course this setup is for "bang the sticks" type flying and not for top speed.

There is a higher kv 480 (around 1050kv I think) that would give you better pitch speed vs the 450 or 480/910. If you are looking for maximum speed you can drop down in prop diameter and go up in pitch, say around a 9x9 or 10x8 to get the balance between speed and thrust you are looking for.

Good luck and good flying

Randy
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Old Nov 07, 2006, 08:22 AM
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Chattanooga, Tennessee, United States
Joined May 2003
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For the 1/2oz weight difference you can put 200W though the 480 and only 140W through the 450. Stick a 9x9 (or whatever high pitched prop pulls ~20A) on the 480 and it MUST get you more speed.
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Old Nov 07, 2006, 02:05 PM
Build, Fly, Crash. Repeat
Tampa, FL
Joined Oct 2005
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Thanks guys, more watts behind a more pitchy prop, check, so let me throw a curveball....

what about returning one of these (if its possible, some LHS don't like that) a nd getting something like (or equivalent to) Himax 2025-4200 inrunner and slap it in the supplied falcon 400 gearbox. Weight probably goes up a bit however this way I can control with gearing how fast whichever prop is going to spin.? What would be better than the himax? I think it can only handle 175 watts to the 480's 200+ Thoughts?
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Old Nov 07, 2006, 03:40 PM
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Port Fairy, Australia
Joined Jun 2005
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Nooooooo don't do it. Gearboxes are noisy and need maintaining. Changing prop pitch is the same thing as changing gearing but a whole lot easier At the weights you are talking about you may want the 200-250W power of the 480.

Tim
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Old Nov 07, 2006, 04:34 PM
Sir Buildsalot
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Stockbridge, GA
Joined Nov 2002
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Quote:
Originally Posted by tim_mellor
Nooooooo don't do it. Gearboxes are noisy and need maintaining. Changing prop pitch is the same thing as changing gearing but a whole lot easier At the weights you are talking about you may want the 200-250W power of the 480.

Tim
I TOTALLY AGREE WITH TIM, ditch the GB.

Oh, and good luck returning that motor, most hobby shops will not do that.

Just my $.02
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Old Nov 07, 2006, 04:39 PM
Build, Fly, Crash. Repeat
Tampa, FL
Joined Oct 2005
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Done and done. Thanks guys! 480 it is, will report on flight characteristics

This is why I love RCGroups
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Last edited by IBWingnutz; Nov 07, 2006 at 04:51 PM.
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Old Nov 08, 2006, 05:49 AM
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Israel
Joined Oct 2004
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what are the hacker, Axi, Hyperion or a chinese motor equivlent to the 480?
Eran
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Old Nov 08, 2006, 06:15 AM
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Sydney, Oz.
Joined Mar 2006
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Hacker A30-28S
Hyperion 3007-30

I use the Hyperion in my 27oz PA Katana Mini. Using an 11x5.5E prop it pulls about 25A for 270W. Its plenty of 3D power, pulls out of hovers wonderfully.
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